/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=BIGGEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 13:03:18,545 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 13:03:18,547 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 13:03:18,574 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 13:03:18,574 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 13:03:18,575 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 13:03:18,577 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 13:03:18,578 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 13:03:18,580 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 13:03:18,581 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 13:03:18,582 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 13:03:18,583 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 13:03:18,583 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 13:03:18,584 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 13:03:18,586 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 13:03:18,587 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 13:03:18,587 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 13:03:18,588 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 13:03:18,590 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 13:03:18,592 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 13:03:18,593 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 13:03:18,594 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 13:03:18,595 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 13:03:18,596 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 13:03:18,598 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 13:03:18,606 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 13:03:18,606 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 13:03:18,607 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 13:03:18,608 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 [2020-08-18 13:03:18,643 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 13:03:18,643 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 13:03:18,645 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 13:03:18,645 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 13:03:18,645 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 13:03:18,645 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 13:03:18,645 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 13:03:18,646 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 13:03:18,646 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 13:03:18,646 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 13:03:18,646 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 13:03:18,646 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 13:03:18,647 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 13:03:18,647 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 13:03:18,647 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 13:03:18,647 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 13:03:18,647 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 13:03:18,647 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 13:03:18,648 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 13:03:18,648 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 13:03:18,648 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 13:03:18,648 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 13:03:18,648 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 13:03:18,649 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 13:03:18,649 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 13:03:18,649 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 13:03:18,649 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 13:03:18,649 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 13:03:18,650 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 13:03:18,650 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=BIGGEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=BIGGEST; [2020-08-18 13:03:18,967 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 13:03:18,984 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 13:03:18,990 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 13:03:18,992 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 13:03:18,992 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 13:03:18,993 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-18 13:03:19,058 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/80680676d/b7c3c7a2b94d421099145c0a96767f00/FLAG9d3c7f198 [2020-08-18 13:03:19,516 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 13:03:19,516 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-18 13:03:19,521 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/80680676d/b7c3c7a2b94d421099145c0a96767f00/FLAG9d3c7f198 [2020-08-18 13:03:19,948 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/80680676d/b7c3c7a2b94d421099145c0a96767f00 [2020-08-18 13:03:19,957 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 13:03:19,958 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 13:03:19,959 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 13:03:19,959 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 13:03:19,963 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 13:03:19,964 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 01:03:19" (1/1) ... [2020-08-18 13:03:19,966 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@47a8d835 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:03:19, skipping insertion in model container [2020-08-18 13:03:19,967 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 01:03:19" (1/1) ... [2020-08-18 13:03:19,975 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 13:03:19,994 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 13:03:20,185 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 13:03:20,192 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 13:03:20,212 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 13:03:20,229 INFO L208 MainTranslator]: Completed translation [2020-08-18 13:03:20,229 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:03:20 WrapperNode [2020-08-18 13:03:20,229 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 13:03:20,230 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 13:03:20,230 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 13:03:20,230 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 13:03:20,340 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:03:20" (1/1) ... [2020-08-18 13:03:20,342 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:03:20" (1/1) ... [2020-08-18 13:03:20,352 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:03:20" (1/1) ... [2020-08-18 13:03:20,354 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:03:20" (1/1) ... [2020-08-18 13:03:20,370 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:03:20" (1/1) ... [2020-08-18 13:03:20,375 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:03:20" (1/1) ... [2020-08-18 13:03:20,376 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:03:20" (1/1) ... [2020-08-18 13:03:20,378 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 13:03:20,379 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 13:03:20,379 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 13:03:20,379 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 13:03:20,380 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:03:20" (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 [2020-08-18 13:03:20,432 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 13:03:20,433 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 13:03:20,433 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 13:03:20,433 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-18 13:03:20,434 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 13:03:20,434 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-18 13:03:20,435 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 13:03:20,435 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 13:03:20,435 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-18 13:03:20,435 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-18 13:03:20,436 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 13:03:20,436 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 13:03:20,436 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 13:03:20,436 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 13:03:20,436 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 13:03:20,437 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 13:03:20,437 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 13:03:20,700 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 13:03:20,700 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 13:03:20,706 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 01:03:20 BoogieIcfgContainer [2020-08-18 13:03:20,707 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 13:03:20,708 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 13:03:20,708 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 13:03:20,711 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 13:03:20,711 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 01:03:19" (1/3) ... [2020-08-18 13:03:20,712 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@549331a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 01:03:20, skipping insertion in model container [2020-08-18 13:03:20,712 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:03:20" (2/3) ... [2020-08-18 13:03:20,713 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@549331a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 01:03:20, skipping insertion in model container [2020-08-18 13:03:20,713 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 01:03:20" (3/3) ... [2020-08-18 13:03:20,715 INFO L109 eAbstractionObserver]: Analyzing ICFG array_of_struct_ptr_flag_init.i [2020-08-18 13:03:20,728 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 13:03:20,736 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 13:03:20,754 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 13:03:20,784 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 13:03:20,784 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 13:03:20,784 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 13:03:20,784 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 13:03:20,784 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 13:03:20,785 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 13:03:20,785 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 13:03:20,785 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 13:03:20,805 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-18 13:03:20,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 13:03:20,813 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:20,814 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:20,815 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:20,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:20,826 INFO L82 PathProgramCache]: Analyzing trace with hash -850547107, now seen corresponding path program 1 times [2020-08-18 13:03:20,835 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:20,836 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1130997961] [2020-08-18 13:03:20,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:20,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:21,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:21,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:21,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:21,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:21,073 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 13:03:21,074 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1130997961] [2020-08-18 13:03:21,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 13:03:21,077 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 13:03:21,078 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771576052] [2020-08-18 13:03:21,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 13:03:21,084 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:21,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 13:03:21,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 13:03:21,097 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-18 13:03:21,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:21,246 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-18 13:03:21,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 13:03:21,248 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-18 13:03:21,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:21,260 INFO L225 Difference]: With dead ends: 59 [2020-08-18 13:03:21,260 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 13:03:21,264 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 13:03:21,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 13:03:21,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-18 13:03:21,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 13:03:21,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-18 13:03:21,303 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-18 13:03:21,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:21,304 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-18 13:03:21,304 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 13:03:21,304 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-18 13:03:21,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 13:03:21,306 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:21,306 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:21,306 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 13:03:21,307 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:21,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:21,307 INFO L82 PathProgramCache]: Analyzing trace with hash 1453375688, now seen corresponding path program 1 times [2020-08-18 13:03:21,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:21,308 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [894493731] [2020-08-18 13:03:21,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:21,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:21,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:21,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:21,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:21,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:21,467 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 13:03:21,467 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [894493731] [2020-08-18 13:03:21,468 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 13:03:21,468 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 13:03:21,468 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425652959] [2020-08-18 13:03:21,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 13:03:21,470 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:21,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 13:03:21,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 13:03:21,471 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-18 13:03:21,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:21,675 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-18 13:03:21,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 13:03:21,675 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-18 13:03:21,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:21,677 INFO L225 Difference]: With dead ends: 48 [2020-08-18 13:03:21,677 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 13:03:21,679 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-08-18 13:03:21,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 13:03:21,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 13:03:21,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 13:03:21,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-18 13:03:21,688 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-18 13:03:21,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:21,688 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-18 13:03:21,688 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 13:03:21,689 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-18 13:03:21,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 13:03:21,690 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:21,690 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:21,690 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 13:03:21,691 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:21,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:21,691 INFO L82 PathProgramCache]: Analyzing trace with hash -169907062, now seen corresponding path program 1 times [2020-08-18 13:03:21,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:21,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [638928721] [2020-08-18 13:03:21,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:21,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:21,764 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:21,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:21,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:21,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:21,903 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 13:03:21,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [638928721] [2020-08-18 13:03:21,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:21,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 13:03:21,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387446672] [2020-08-18 13:03:21,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 13:03:21,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:21,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 13:03:21,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 13:03:21,906 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-18 13:03:22,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:22,069 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-18 13:03:22,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 13:03:22,070 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-18 13:03:22,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:22,071 INFO L225 Difference]: With dead ends: 50 [2020-08-18 13:03:22,071 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 13:03:22,072 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-18 13:03:22,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 13:03:22,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 13:03:22,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 13:03:22,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-18 13:03:22,080 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-18 13:03:22,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:22,080 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-18 13:03:22,080 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 13:03:22,081 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-18 13:03:22,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 13:03:22,082 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:22,082 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:22,082 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 13:03:22,082 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:22,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:22,083 INFO L82 PathProgramCache]: Analyzing trace with hash -1071501364, now seen corresponding path program 2 times [2020-08-18 13:03:22,083 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:22,083 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1943891356] [2020-08-18 13:03:22,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:22,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:22,128 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:22,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:22,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:22,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:22,269 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 13:03:22,270 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1943891356] [2020-08-18 13:03:22,270 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:22,270 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 13:03:22,271 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351498067] [2020-08-18 13:03:22,271 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 13:03:22,272 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:22,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 13:03:22,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-18 13:03:22,272 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-18 13:03:22,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:22,447 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-18 13:03:22,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 13:03:22,447 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-18 13:03:22,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:22,449 INFO L225 Difference]: With dead ends: 52 [2020-08-18 13:03:22,449 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 13:03:22,450 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 13:03:22,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 13:03:22,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 13:03:22,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 13:03:22,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-18 13:03:22,456 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-18 13:03:22,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:22,457 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-18 13:03:22,457 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 13:03:22,457 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-18 13:03:22,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 13:03:22,458 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:22,458 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:22,459 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 13:03:22,459 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:22,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:22,459 INFO L82 PathProgramCache]: Analyzing trace with hash 79768206, now seen corresponding path program 3 times [2020-08-18 13:03:22,460 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:22,460 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [257726735] [2020-08-18 13:03:22,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:22,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:22,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:22,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:22,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:22,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:22,680 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 13:03:22,681 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [257726735] [2020-08-18 13:03:22,681 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:22,681 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 13:03:22,682 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177156012] [2020-08-18 13:03:22,682 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 13:03:22,682 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:22,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 13:03:22,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 13:03:22,683 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-18 13:03:22,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:22,883 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-18 13:03:22,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 13:03:22,884 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-18 13:03:22,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:22,885 INFO L225 Difference]: With dead ends: 54 [2020-08-18 13:03:22,885 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 13:03:22,886 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-18 13:03:22,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 13:03:22,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 13:03:22,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 13:03:22,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-18 13:03:22,892 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-18 13:03:22,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:22,892 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-18 13:03:22,892 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 13:03:22,893 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-18 13:03:22,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 13:03:22,893 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:22,894 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:22,894 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 13:03:22,894 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:22,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:22,895 INFO L82 PathProgramCache]: Analyzing trace with hash -1651737392, now seen corresponding path program 4 times [2020-08-18 13:03:22,895 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:22,895 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [450854209] [2020-08-18 13:03:22,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:22,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:22,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:22,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:22,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:22,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:23,142 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 13:03:23,142 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [450854209] [2020-08-18 13:03:23,143 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:23,143 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 13:03:23,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149906314] [2020-08-18 13:03:23,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 13:03:23,144 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:23,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 13:03:23,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-18 13:03:23,145 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-18 13:03:23,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:23,315 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-18 13:03:23,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 13:03:23,315 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-18 13:03:23,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:23,316 INFO L225 Difference]: With dead ends: 56 [2020-08-18 13:03:23,316 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 13:03:23,317 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-08-18 13:03:23,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 13:03:23,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 13:03:23,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 13:03:23,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-18 13:03:23,324 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-18 13:03:23,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:23,324 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-18 13:03:23,324 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 13:03:23,324 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-18 13:03:23,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 13:03:23,325 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:23,326 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:23,326 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 13:03:23,326 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:23,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:23,326 INFO L82 PathProgramCache]: Analyzing trace with hash 818693778, now seen corresponding path program 5 times [2020-08-18 13:03:23,327 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:23,327 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1840027370] [2020-08-18 13:03:23,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:23,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:23,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:23,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:23,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:23,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:23,635 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 13:03:23,636 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1840027370] [2020-08-18 13:03:23,636 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:23,636 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 13:03:23,637 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110062089] [2020-08-18 13:03:23,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 13:03:23,637 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:23,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 13:03:23,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 13:03:23,638 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-18 13:03:23,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:23,831 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-18 13:03:23,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 13:03:23,832 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-18 13:03:23,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:23,833 INFO L225 Difference]: With dead ends: 58 [2020-08-18 13:03:23,833 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 13:03:23,834 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-18 13:03:23,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 13:03:23,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-18 13:03:23,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 13:03:23,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-18 13:03:23,839 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-18 13:03:23,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:23,839 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-18 13:03:23,840 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 13:03:23,840 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-18 13:03:23,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 13:03:23,841 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:23,841 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:23,841 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 13:03:23,841 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:23,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:23,842 INFO L82 PathProgramCache]: Analyzing trace with hash -213866540, now seen corresponding path program 6 times [2020-08-18 13:03:23,842 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:23,843 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1851799270] [2020-08-18 13:03:23,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:23,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:23,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:23,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:23,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:23,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:24,191 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 13:03:24,192 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1851799270] [2020-08-18 13:03:24,192 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:24,192 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 13:03:24,193 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126984610] [2020-08-18 13:03:24,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 13:03:24,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:24,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 13:03:24,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-18 13:03:24,194 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-18 13:03:24,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:24,402 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-18 13:03:24,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 13:03:24,403 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-18 13:03:24,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:24,404 INFO L225 Difference]: With dead ends: 60 [2020-08-18 13:03:24,404 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 13:03:24,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-18 13:03:24,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 13:03:24,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-18 13:03:24,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 13:03:24,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-18 13:03:24,416 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-18 13:03:24,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:24,420 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-18 13:03:24,420 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 13:03:24,420 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-18 13:03:24,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 13:03:24,421 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:24,421 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:24,421 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 13:03:24,421 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:24,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:24,425 INFO L82 PathProgramCache]: Analyzing trace with hash -366886762, now seen corresponding path program 7 times [2020-08-18 13:03:24,425 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:24,426 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1745739744] [2020-08-18 13:03:24,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:24,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:24,475 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:24,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:24,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:24,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:24,800 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 13:03:24,801 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1745739744] [2020-08-18 13:03:24,801 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:24,801 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 13:03:24,801 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275354539] [2020-08-18 13:03:24,802 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 13:03:24,802 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:24,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 13:03:24,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-18 13:03:24,803 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-18 13:03:24,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:24,993 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-18 13:03:24,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 13:03:24,993 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-18 13:03:24,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:24,994 INFO L225 Difference]: With dead ends: 62 [2020-08-18 13:03:24,995 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 13:03:24,995 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-08-18 13:03:24,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 13:03:24,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-18 13:03:24,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 13:03:25,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-18 13:03:25,000 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-18 13:03:25,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:25,001 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-18 13:03:25,001 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 13:03:25,001 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-18 13:03:25,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 13:03:25,002 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:25,002 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:25,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 13:03:25,002 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:25,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:25,003 INFO L82 PathProgramCache]: Analyzing trace with hash -1390432040, now seen corresponding path program 8 times [2020-08-18 13:03:25,003 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:25,003 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [876182705] [2020-08-18 13:03:25,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:25,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:25,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:25,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:25,045 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:25,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:25,367 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 13:03:25,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [876182705] [2020-08-18 13:03:25,367 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:25,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 13:03:25,368 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603258765] [2020-08-18 13:03:25,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 13:03:25,368 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:25,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 13:03:25,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-18 13:03:25,369 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-18 13:03:25,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:25,603 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-18 13:03:25,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 13:03:25,603 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-18 13:03:25,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:25,604 INFO L225 Difference]: With dead ends: 64 [2020-08-18 13:03:25,604 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 13:03:25,605 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-08-18 13:03:25,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 13:03:25,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-18 13:03:25,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 13:03:25,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-18 13:03:25,611 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-18 13:03:25,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:25,612 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-18 13:03:25,612 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 13:03:25,612 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-18 13:03:25,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 13:03:25,613 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:25,613 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:25,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 13:03:25,613 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:25,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:25,614 INFO L82 PathProgramCache]: Analyzing trace with hash -1469933414, now seen corresponding path program 9 times [2020-08-18 13:03:25,614 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:25,614 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1184088575] [2020-08-18 13:03:25,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:25,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:25,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:25,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:25,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:25,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:25,681 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-18 13:03:25,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1184088575] [2020-08-18 13:03:25,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 13:03:25,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 13:03:25,682 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707754938] [2020-08-18 13:03:25,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 13:03:25,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:25,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 13:03:25,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 13:03:25,684 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-18 13:03:25,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:25,794 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-18 13:03:25,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 13:03:25,795 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-18 13:03:25,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:25,797 INFO L225 Difference]: With dead ends: 65 [2020-08-18 13:03:25,797 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 13:03:25,797 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 13:03:25,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 13:03:25,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-18 13:03:25,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 13:03:25,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-18 13:03:25,823 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-18 13:03:25,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:25,823 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-18 13:03:25,823 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 13:03:25,823 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-18 13:03:25,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 13:03:25,824 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:25,824 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:25,824 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 13:03:25,824 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:25,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:25,827 INFO L82 PathProgramCache]: Analyzing trace with hash -1568016950, now seen corresponding path program 1 times [2020-08-18 13:03:25,827 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:25,827 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [134207264] [2020-08-18 13:03:25,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:25,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:25,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:25,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:25,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:25,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:25,927 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-18 13:03:25,927 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [134207264] [2020-08-18 13:03:25,927 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:25,927 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 13:03:25,928 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703253958] [2020-08-18 13:03:25,928 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 13:03:25,928 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:25,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 13:03:25,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 13:03:25,929 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-18 13:03:26,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:26,046 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-18 13:03:26,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 13:03:26,047 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-18 13:03:26,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:26,048 INFO L225 Difference]: With dead ends: 73 [2020-08-18 13:03:26,049 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 13:03:26,050 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-18 13:03:26,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 13:03:26,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-18 13:03:26,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 13:03:26,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-18 13:03:26,058 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-18 13:03:26,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:26,060 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-18 13:03:26,061 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 13:03:26,061 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-18 13:03:26,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 13:03:26,065 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:26,065 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:26,065 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 13:03:26,065 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:26,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:26,066 INFO L82 PathProgramCache]: Analyzing trace with hash 1298090650, now seen corresponding path program 2 times [2020-08-18 13:03:26,066 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:26,066 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1334311992] [2020-08-18 13:03:26,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:26,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:26,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:26,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:26,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:26,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:26,161 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-18 13:03:26,161 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1334311992] [2020-08-18 13:03:26,162 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 13:03:26,162 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 13:03:26,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203092177] [2020-08-18 13:03:26,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 13:03:26,163 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:26,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 13:03:26,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 13:03:26,164 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-18 13:03:26,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:26,248 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-18 13:03:26,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 13:03:26,249 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-18 13:03:26,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:26,250 INFO L225 Difference]: With dead ends: 69 [2020-08-18 13:03:26,250 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 13:03:26,251 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 13:03:26,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 13:03:26,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 13:03:26,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 13:03:26,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-18 13:03:26,256 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-18 13:03:26,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:26,257 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-18 13:03:26,257 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 13:03:26,257 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-18 13:03:26,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 13:03:26,258 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:26,258 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:26,258 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 13:03:26,258 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:26,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:26,259 INFO L82 PathProgramCache]: Analyzing trace with hash 318257626, now seen corresponding path program 1 times [2020-08-18 13:03:26,259 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:26,259 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [370393161] [2020-08-18 13:03:26,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:26,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:26,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:26,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:26,307 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:26,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:26,662 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:26,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [370393161] [2020-08-18 13:03:26,664 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:26,664 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 13:03:26,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966906930] [2020-08-18 13:03:26,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 13:03:26,665 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:26,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 13:03:26,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-18 13:03:26,666 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-18 13:03:26,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:26,917 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-18 13:03:26,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 13:03:26,918 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-18 13:03:26,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:26,919 INFO L225 Difference]: With dead ends: 74 [2020-08-18 13:03:26,919 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 13:03:26,920 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-08-18 13:03:26,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 13:03:26,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-18 13:03:26,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 13:03:26,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-18 13:03:26,926 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-18 13:03:26,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:26,926 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-18 13:03:26,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 13:03:26,926 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-18 13:03:26,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 13:03:26,927 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:26,927 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:26,927 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 13:03:26,927 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:26,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:26,928 INFO L82 PathProgramCache]: Analyzing trace with hash -935313508, now seen corresponding path program 2 times [2020-08-18 13:03:26,928 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:26,928 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1864712386] [2020-08-18 13:03:26,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:26,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:26,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:26,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:26,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:26,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:27,391 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:27,392 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1864712386] [2020-08-18 13:03:27,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:27,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 13:03:27,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842138621] [2020-08-18 13:03:27,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 13:03:27,393 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:27,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 13:03:27,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-18 13:03:27,394 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-18 13:03:27,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:27,628 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-18 13:03:27,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 13:03:27,629 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-18 13:03:27,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:27,630 INFO L225 Difference]: With dead ends: 76 [2020-08-18 13:03:27,630 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 13:03:27,631 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-18 13:03:27,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 13:03:27,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-18 13:03:27,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 13:03:27,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-18 13:03:27,641 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-18 13:03:27,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:27,642 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-18 13:03:27,643 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 13:03:27,643 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-18 13:03:27,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 13:03:27,644 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:27,644 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:27,644 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 13:03:27,644 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:27,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:27,645 INFO L82 PathProgramCache]: Analyzing trace with hash 1268636894, now seen corresponding path program 3 times [2020-08-18 13:03:27,645 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:27,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [198621797] [2020-08-18 13:03:27,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:27,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:27,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:27,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:27,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:27,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:28,248 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:28,249 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [198621797] [2020-08-18 13:03:28,251 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:28,251 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 13:03:28,251 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026850231] [2020-08-18 13:03:28,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 13:03:28,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:28,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 13:03:28,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-18 13:03:28,253 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-18 13:03:28,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:28,487 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-18 13:03:28,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 13:03:28,487 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-18 13:03:28,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:28,488 INFO L225 Difference]: With dead ends: 78 [2020-08-18 13:03:28,488 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 13:03:28,489 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-18 13:03:28,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 13:03:28,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-18 13:03:28,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 13:03:28,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-18 13:03:28,493 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-18 13:03:28,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:28,494 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-18 13:03:28,494 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 13:03:28,494 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-18 13:03:28,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 13:03:28,494 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:28,495 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:28,495 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 13:03:28,495 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:28,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:28,495 INFO L82 PathProgramCache]: Analyzing trace with hash 1846096288, now seen corresponding path program 4 times [2020-08-18 13:03:28,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:28,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [742233154] [2020-08-18 13:03:28,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:28,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:28,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:28,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:28,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:28,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:29,056 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:29,056 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [742233154] [2020-08-18 13:03:29,057 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:29,057 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 13:03:29,057 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [993770680] [2020-08-18 13:03:29,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 13:03:29,058 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:29,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 13:03:29,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-18 13:03:29,058 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-18 13:03:29,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:29,320 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-18 13:03:29,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 13:03:29,321 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-18 13:03:29,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:29,322 INFO L225 Difference]: With dead ends: 80 [2020-08-18 13:03:29,322 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 13:03:29,323 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-18 13:03:29,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 13:03:29,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-18 13:03:29,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 13:03:29,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-18 13:03:29,333 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-18 13:03:29,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:29,333 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-18 13:03:29,334 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 13:03:29,334 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-18 13:03:29,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 13:03:29,334 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:29,334 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:29,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 13:03:29,335 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:29,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:29,335 INFO L82 PathProgramCache]: Analyzing trace with hash -1561174558, now seen corresponding path program 5 times [2020-08-18 13:03:29,335 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:29,336 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1557664051] [2020-08-18 13:03:29,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:29,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:29,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:29,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:29,388 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:29,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:29,938 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:29,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1557664051] [2020-08-18 13:03:29,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:29,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 13:03:29,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756623612] [2020-08-18 13:03:29,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 13:03:29,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:29,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 13:03:29,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-18 13:03:29,949 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-18 13:03:30,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:30,210 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-18 13:03:30,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 13:03:30,211 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-18 13:03:30,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:30,212 INFO L225 Difference]: With dead ends: 82 [2020-08-18 13:03:30,212 INFO L226 Difference]: Without dead ends: 60 [2020-08-18 13:03:30,213 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-18 13:03:30,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-18 13:03:30,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-18 13:03:30,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 13:03:30,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-18 13:03:30,219 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-18 13:03:30,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:30,219 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-18 13:03:30,219 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 13:03:30,219 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-18 13:03:30,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 13:03:30,220 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:30,220 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:30,220 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 13:03:30,221 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:30,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:30,221 INFO L82 PathProgramCache]: Analyzing trace with hash 1111589284, now seen corresponding path program 6 times [2020-08-18 13:03:30,221 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:30,221 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2002279727] [2020-08-18 13:03:30,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:30,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:30,256 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:30,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:30,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:30,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:30,898 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:30,898 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2002279727] [2020-08-18 13:03:30,899 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:30,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 13:03:30,899 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678222814] [2020-08-18 13:03:30,899 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 13:03:30,900 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:30,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 13:03:30,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-18 13:03:30,900 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-18 13:03:31,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:31,175 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-18 13:03:31,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 13:03:31,175 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-18 13:03:31,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:31,177 INFO L225 Difference]: With dead ends: 84 [2020-08-18 13:03:31,177 INFO L226 Difference]: Without dead ends: 62 [2020-08-18 13:03:31,178 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-18 13:03:31,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-18 13:03:31,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-18 13:03:31,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 13:03:31,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-18 13:03:31,183 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-18 13:03:31,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:31,184 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-18 13:03:31,184 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 13:03:31,184 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-18 13:03:31,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 13:03:31,185 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:31,185 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:31,185 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 13:03:31,185 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:31,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:31,186 INFO L82 PathProgramCache]: Analyzing trace with hash 1247198438, now seen corresponding path program 7 times [2020-08-18 13:03:31,186 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:31,186 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [794447092] [2020-08-18 13:03:31,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:31,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:31,232 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:31,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:31,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:31,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:31,911 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:31,912 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [794447092] [2020-08-18 13:03:31,912 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:31,912 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 13:03:31,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275348362] [2020-08-18 13:03:31,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 13:03:31,913 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:31,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 13:03:31,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-18 13:03:31,913 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-18 13:03:32,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:32,139 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-18 13:03:32,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 13:03:32,140 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-18 13:03:32,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:32,141 INFO L225 Difference]: With dead ends: 86 [2020-08-18 13:03:32,141 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 13:03:32,142 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-18 13:03:32,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 13:03:32,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-18 13:03:32,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-18 13:03:32,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-18 13:03:32,147 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-18 13:03:32,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:32,148 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-18 13:03:32,148 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 13:03:32,148 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-18 13:03:32,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 13:03:32,149 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:32,149 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:32,149 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 13:03:32,149 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:32,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:32,149 INFO L82 PathProgramCache]: Analyzing trace with hash -1576390744, now seen corresponding path program 8 times [2020-08-18 13:03:32,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:32,150 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1483052107] [2020-08-18 13:03:32,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:32,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:32,199 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:32,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:32,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:32,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:33,068 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:33,069 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1483052107] [2020-08-18 13:03:33,069 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:33,069 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 13:03:33,070 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528788836] [2020-08-18 13:03:33,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 13:03:33,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:33,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 13:03:33,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-18 13:03:33,074 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-18 13:03:33,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:33,447 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-18 13:03:33,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 13:03:33,448 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-18 13:03:33,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:33,449 INFO L225 Difference]: With dead ends: 88 [2020-08-18 13:03:33,449 INFO L226 Difference]: Without dead ends: 66 [2020-08-18 13:03:33,450 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-18 13:03:33,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-18 13:03:33,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-18 13:03:33,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-18 13:03:33,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-18 13:03:33,457 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-18 13:03:33,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:33,457 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-18 13:03:33,457 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 13:03:33,458 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-18 13:03:33,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 13:03:33,459 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:33,459 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:33,459 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 13:03:33,459 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:33,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:33,460 INFO L82 PathProgramCache]: Analyzing trace with hash -626263574, now seen corresponding path program 9 times [2020-08-18 13:03:33,460 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:33,460 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [127696103] [2020-08-18 13:03:33,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:33,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:33,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:33,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:33,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:33,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:34,378 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:34,378 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [127696103] [2020-08-18 13:03:34,378 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:34,378 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 13:03:34,379 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453404503] [2020-08-18 13:03:34,379 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 13:03:34,379 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:34,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 13:03:34,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-18 13:03:34,380 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-18 13:03:34,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:34,693 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-18 13:03:34,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 13:03:34,695 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-18 13:03:34,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:34,696 INFO L225 Difference]: With dead ends: 90 [2020-08-18 13:03:34,696 INFO L226 Difference]: Without dead ends: 68 [2020-08-18 13:03:34,697 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-18 13:03:34,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-18 13:03:34,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-18 13:03:34,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 13:03:34,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-18 13:03:34,701 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-18 13:03:34,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:34,702 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-18 13:03:34,702 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 13:03:34,702 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-18 13:03:34,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-18 13:03:34,702 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:34,703 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:34,703 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 13:03:34,703 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:34,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:34,703 INFO L82 PathProgramCache]: Analyzing trace with hash 1912880044, now seen corresponding path program 10 times [2020-08-18 13:03:34,704 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:34,704 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [393691610] [2020-08-18 13:03:34,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:34,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:34,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:34,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:34,776 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:34,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:35,588 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:35,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [393691610] [2020-08-18 13:03:35,589 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:35,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 13:03:35,589 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571870981] [2020-08-18 13:03:35,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 13:03:35,590 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:35,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 13:03:35,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-18 13:03:35,590 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-18 13:03:35,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:35,868 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-18 13:03:35,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 13:03:35,868 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-18 13:03:35,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:35,869 INFO L225 Difference]: With dead ends: 92 [2020-08-18 13:03:35,869 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 13:03:35,870 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-18 13:03:35,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 13:03:35,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-18 13:03:35,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 13:03:35,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-18 13:03:35,874 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-18 13:03:35,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:35,874 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-18 13:03:35,874 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 13:03:35,874 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-18 13:03:35,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-18 13:03:35,875 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:35,875 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:35,875 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 13:03:35,876 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:35,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:35,876 INFO L82 PathProgramCache]: Analyzing trace with hash -1806494482, now seen corresponding path program 11 times [2020-08-18 13:03:35,876 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:35,876 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1489914997] [2020-08-18 13:03:35,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:35,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:35,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:35,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:35,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:35,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:36,798 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:36,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1489914997] [2020-08-18 13:03:36,798 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:36,798 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 13:03:36,799 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092294768] [2020-08-18 13:03:36,799 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 13:03:36,799 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:36,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 13:03:36,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-18 13:03:36,800 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-18 13:03:37,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:37,146 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-18 13:03:37,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 13:03:37,147 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-18 13:03:37,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:37,148 INFO L225 Difference]: With dead ends: 94 [2020-08-18 13:03:37,148 INFO L226 Difference]: Without dead ends: 72 [2020-08-18 13:03:37,149 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-18 13:03:37,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-18 13:03:37,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-18 13:03:37,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-18 13:03:37,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-18 13:03:37,153 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-18 13:03:37,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:37,153 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-18 13:03:37,153 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 13:03:37,153 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-18 13:03:37,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 13:03:37,154 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:37,154 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:37,154 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 13:03:37,155 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:37,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:37,155 INFO L82 PathProgramCache]: Analyzing trace with hash 1582343600, now seen corresponding path program 12 times [2020-08-18 13:03:37,155 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:37,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2075735100] [2020-08-18 13:03:37,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:37,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:37,206 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:37,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:37,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:37,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:38,191 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:38,191 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2075735100] [2020-08-18 13:03:38,191 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:38,192 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 13:03:38,192 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91726391] [2020-08-18 13:03:38,192 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 13:03:38,192 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:38,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 13:03:38,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-18 13:03:38,193 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-18 13:03:38,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:38,551 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-18 13:03:38,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 13:03:38,552 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-18 13:03:38,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:38,553 INFO L225 Difference]: With dead ends: 96 [2020-08-18 13:03:38,553 INFO L226 Difference]: Without dead ends: 74 [2020-08-18 13:03:38,554 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-18 13:03:38,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-18 13:03:38,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-18 13:03:38,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 13:03:38,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-18 13:03:38,558 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-18 13:03:38,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:38,559 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-18 13:03:38,559 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 13:03:38,559 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-18 13:03:38,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-18 13:03:38,560 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:38,560 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:38,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 13:03:38,560 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:38,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:38,561 INFO L82 PathProgramCache]: Analyzing trace with hash -1624437262, now seen corresponding path program 13 times [2020-08-18 13:03:38,561 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:38,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [820591944] [2020-08-18 13:03:38,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:38,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:38,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:38,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:38,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:38,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:39,645 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:39,645 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [820591944] [2020-08-18 13:03:39,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:39,646 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 13:03:39,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398471102] [2020-08-18 13:03:39,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 13:03:39,646 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:39,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 13:03:39,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-18 13:03:39,651 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-18 13:03:39,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:39,882 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-18 13:03:39,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 13:03:39,884 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-18 13:03:39,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:39,885 INFO L225 Difference]: With dead ends: 98 [2020-08-18 13:03:39,885 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 13:03:39,886 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-18 13:03:39,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 13:03:39,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-18 13:03:39,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-18 13:03:39,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-18 13:03:39,890 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-18 13:03:39,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:39,891 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-18 13:03:39,891 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 13:03:39,891 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-18 13:03:39,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-18 13:03:39,892 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:39,892 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:39,892 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 13:03:39,892 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:39,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:39,892 INFO L82 PathProgramCache]: Analyzing trace with hash 445672884, now seen corresponding path program 14 times [2020-08-18 13:03:39,893 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:39,893 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1089280021] [2020-08-18 13:03:39,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:39,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:39,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:39,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:39,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:39,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:41,266 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:41,267 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1089280021] [2020-08-18 13:03:41,267 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:41,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 13:03:41,267 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666402090] [2020-08-18 13:03:41,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 13:03:41,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:41,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 13:03:41,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-18 13:03:41,269 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-18 13:03:41,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:41,616 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-18 13:03:41,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 13:03:41,616 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-18 13:03:41,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:41,617 INFO L225 Difference]: With dead ends: 100 [2020-08-18 13:03:41,617 INFO L226 Difference]: Without dead ends: 78 [2020-08-18 13:03:41,618 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-18 13:03:41,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-18 13:03:41,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-18 13:03:41,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-18 13:03:41,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-18 13:03:41,626 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-18 13:03:41,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:41,626 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-18 13:03:41,626 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 13:03:41,627 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-18 13:03:41,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 13:03:41,627 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:41,627 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:41,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 13:03:41,628 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:41,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:41,628 INFO L82 PathProgramCache]: Analyzing trace with hash 1251665142, now seen corresponding path program 15 times [2020-08-18 13:03:41,628 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:41,629 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2002957083] [2020-08-18 13:03:41,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:41,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:41,689 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:41,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:41,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:41,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:42,825 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:42,826 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2002957083] [2020-08-18 13:03:42,826 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:42,826 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 13:03:42,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700778390] [2020-08-18 13:03:42,827 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 13:03:42,827 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:42,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 13:03:42,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-18 13:03:42,828 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-18 13:03:43,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:43,217 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-18 13:03:43,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 13:03:43,217 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-18 13:03:43,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:43,218 INFO L225 Difference]: With dead ends: 102 [2020-08-18 13:03:43,219 INFO L226 Difference]: Without dead ends: 80 [2020-08-18 13:03:43,219 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-18 13:03:43,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-18 13:03:43,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-18 13:03:43,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 13:03:43,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-18 13:03:43,224 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-18 13:03:43,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:43,224 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-18 13:03:43,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 13:03:43,224 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-18 13:03:43,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-18 13:03:43,225 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:43,225 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:43,225 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 13:03:43,225 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:43,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:43,226 INFO L82 PathProgramCache]: Analyzing trace with hash -1578855496, now seen corresponding path program 16 times [2020-08-18 13:03:43,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:43,226 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2082999314] [2020-08-18 13:03:43,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:43,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:43,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:43,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:43,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:43,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:44,584 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:44,584 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2082999314] [2020-08-18 13:03:44,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:44,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 13:03:44,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687767779] [2020-08-18 13:03:44,585 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 13:03:44,585 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:44,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 13:03:44,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-18 13:03:44,586 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-18 13:03:44,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:44,890 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-18 13:03:44,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 13:03:44,891 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-18 13:03:44,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:44,892 INFO L225 Difference]: With dead ends: 104 [2020-08-18 13:03:44,892 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 13:03:44,893 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 13:03:44,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 13:03:44,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-18 13:03:44,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-18 13:03:44,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-18 13:03:44,899 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-18 13:03:44,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:44,899 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-18 13:03:44,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 13:03:44,899 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-18 13:03:44,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-18 13:03:44,900 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:44,901 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:44,901 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 13:03:44,901 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:44,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:44,901 INFO L82 PathProgramCache]: Analyzing trace with hash 1300077050, now seen corresponding path program 17 times [2020-08-18 13:03:44,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:44,902 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1111845846] [2020-08-18 13:03:44,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:44,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:44,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:44,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:44,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:44,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:46,268 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:46,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1111845846] [2020-08-18 13:03:46,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:46,269 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 13:03:46,269 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214944462] [2020-08-18 13:03:46,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 13:03:46,269 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:46,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 13:03:46,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-18 13:03:46,270 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-18 13:03:46,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:46,684 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-18 13:03:46,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 13:03:46,684 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-18 13:03:46,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:46,685 INFO L225 Difference]: With dead ends: 106 [2020-08-18 13:03:46,685 INFO L226 Difference]: Without dead ends: 84 [2020-08-18 13:03:46,686 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 13:03:46,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-18 13:03:46,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-18 13:03:46,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-18 13:03:46,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-18 13:03:46,694 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-18 13:03:46,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:46,694 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-18 13:03:46,694 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 13:03:46,694 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-18 13:03:46,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 13:03:46,696 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:46,696 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:46,696 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 13:03:46,696 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:46,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:46,697 INFO L82 PathProgramCache]: Analyzing trace with hash 1995315132, now seen corresponding path program 18 times [2020-08-18 13:03:46,697 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:46,697 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [848422300] [2020-08-18 13:03:46,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:46,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:46,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:46,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:46,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:46,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:48,138 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:48,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [848422300] [2020-08-18 13:03:48,138 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:48,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 13:03:48,139 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366638743] [2020-08-18 13:03:48,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 13:03:48,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:48,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 13:03:48,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-18 13:03:48,140 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-18 13:03:48,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:48,569 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-18 13:03:48,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 13:03:48,569 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-18 13:03:48,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:48,571 INFO L225 Difference]: With dead ends: 108 [2020-08-18 13:03:48,571 INFO L226 Difference]: Without dead ends: 86 [2020-08-18 13:03:48,572 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 13:03:48,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-18 13:03:48,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-18 13:03:48,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 13:03:48,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-18 13:03:48,575 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-18 13:03:48,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:48,576 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-18 13:03:48,576 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 13:03:48,576 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-18 13:03:48,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-18 13:03:48,576 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:48,576 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:48,577 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 13:03:48,577 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:48,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:48,577 INFO L82 PathProgramCache]: Analyzing trace with hash 104213758, now seen corresponding path program 19 times [2020-08-18 13:03:48,577 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:48,577 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1845421348] [2020-08-18 13:03:48,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:48,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:48,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:48,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:48,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:48,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:50,133 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:50,134 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1845421348] [2020-08-18 13:03:50,134 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:50,134 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 13:03:50,134 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817006321] [2020-08-18 13:03:50,135 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 13:03:50,135 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:50,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 13:03:50,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 13:03:50,136 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-18 13:03:50,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:50,582 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-18 13:03:50,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 13:03:50,582 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-18 13:03:50,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:50,583 INFO L225 Difference]: With dead ends: 110 [2020-08-18 13:03:50,583 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 13:03:50,584 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 13:03:50,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 13:03:50,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-18 13:03:50,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-18 13:03:50,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-18 13:03:50,588 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-18 13:03:50,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:50,589 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-18 13:03:50,589 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 13:03:50,589 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-18 13:03:50,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-18 13:03:50,589 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:50,590 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:50,590 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 13:03:50,590 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:50,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:50,590 INFO L82 PathProgramCache]: Analyzing trace with hash -473040448, now seen corresponding path program 20 times [2020-08-18 13:03:50,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:50,591 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [359530004] [2020-08-18 13:03:50,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:50,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:50,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:50,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:50,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:50,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:52,221 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:52,222 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [359530004] [2020-08-18 13:03:52,222 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:52,222 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 13:03:52,222 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925680928] [2020-08-18 13:03:52,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 13:03:52,222 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:52,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 13:03:52,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 13:03:52,230 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-18 13:03:52,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:52,686 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-18 13:03:52,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 13:03:52,687 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-18 13:03:52,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:52,688 INFO L225 Difference]: With dead ends: 112 [2020-08-18 13:03:52,688 INFO L226 Difference]: Without dead ends: 90 [2020-08-18 13:03:52,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 13:03:52,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-18 13:03:52,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-18 13:03:52,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-18 13:03:52,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-18 13:03:52,695 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-18 13:03:52,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:52,695 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-18 13:03:52,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 13:03:52,695 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-18 13:03:52,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 13:03:52,696 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:52,696 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:52,696 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 13:03:52,697 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:52,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:52,697 INFO L82 PathProgramCache]: Analyzing trace with hash -1163551230, now seen corresponding path program 21 times [2020-08-18 13:03:52,697 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:52,697 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1682023563] [2020-08-18 13:03:52,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:52,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:52,763 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:52,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:52,776 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:52,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:54,413 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:54,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1682023563] [2020-08-18 13:03:54,414 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:54,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 13:03:54,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871227576] [2020-08-18 13:03:54,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 13:03:54,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:54,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 13:03:54,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 13:03:54,415 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-18 13:03:54,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:54,882 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-18 13:03:54,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 13:03:54,882 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-18 13:03:54,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:54,883 INFO L225 Difference]: With dead ends: 114 [2020-08-18 13:03:54,883 INFO L226 Difference]: Without dead ends: 92 [2020-08-18 13:03:54,884 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 13:03:54,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-18 13:03:54,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-18 13:03:54,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 13:03:54,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-18 13:03:54,889 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-18 13:03:54,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:54,890 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-18 13:03:54,890 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 13:03:54,890 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-18 13:03:54,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-18 13:03:54,890 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:54,891 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:54,891 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 13:03:54,891 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:54,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:54,891 INFO L82 PathProgramCache]: Analyzing trace with hash 975518148, now seen corresponding path program 22 times [2020-08-18 13:03:54,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:54,892 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1582112522] [2020-08-18 13:03:54,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:54,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:54,946 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:54,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:54,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:54,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:56,694 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:56,694 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1582112522] [2020-08-18 13:03:56,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:56,695 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 13:03:56,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33716861] [2020-08-18 13:03:56,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 13:03:56,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:56,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 13:03:56,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 13:03:56,696 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-18 13:03:57,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:57,027 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-18 13:03:57,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 13:03:57,027 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-18 13:03:57,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:57,029 INFO L225 Difference]: With dead ends: 116 [2020-08-18 13:03:57,029 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 13:03:57,030 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 13:03:57,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 13:03:57,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-18 13:03:57,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-18 13:03:57,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-18 13:03:57,035 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-18 13:03:57,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:57,035 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-18 13:03:57,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 13:03:57,035 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-18 13:03:57,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-18 13:03:57,036 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:57,036 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:57,036 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 13:03:57,036 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:57,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:57,037 INFO L82 PathProgramCache]: Analyzing trace with hash -668144378, now seen corresponding path program 23 times [2020-08-18 13:03:57,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:57,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1954560400] [2020-08-18 13:03:57,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:57,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:57,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:57,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:57,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:57,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:58,928 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:03:58,928 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1954560400] [2020-08-18 13:03:58,929 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:03:58,929 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 13:03:58,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823287913] [2020-08-18 13:03:58,929 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 13:03:58,929 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:03:58,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 13:03:58,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 13:03:58,930 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-18 13:03:59,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:03:59,437 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-18 13:03:59,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 13:03:59,438 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-18 13:03:59,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:03:59,439 INFO L225 Difference]: With dead ends: 118 [2020-08-18 13:03:59,440 INFO L226 Difference]: Without dead ends: 96 [2020-08-18 13:03:59,441 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 13:03:59,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-18 13:03:59,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-18 13:03:59,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-18 13:03:59,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-18 13:03:59,445 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-18 13:03:59,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:03:59,446 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-18 13:03:59,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 13:03:59,446 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-18 13:03:59,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 13:03:59,447 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:03:59,447 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:03:59,447 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 13:03:59,447 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:03:59,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:03:59,448 INFO L82 PathProgramCache]: Analyzing trace with hash 320133064, now seen corresponding path program 24 times [2020-08-18 13:03:59,448 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:03:59,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [683485508] [2020-08-18 13:03:59,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:03:59,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:59,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:03:59,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:03:59,525 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:03:59,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:04:01,441 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:04:01,441 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [683485508] [2020-08-18 13:04:01,441 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:04:01,441 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 13:04:01,442 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [534841185] [2020-08-18 13:04:01,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 13:04:01,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:04:01,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 13:04:01,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 13:04:01,444 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-18 13:04:01,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:04:01,890 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-18 13:04:01,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 13:04:01,891 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-18 13:04:01,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:04:01,892 INFO L225 Difference]: With dead ends: 120 [2020-08-18 13:04:01,892 INFO L226 Difference]: Without dead ends: 98 [2020-08-18 13:04:01,893 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 13:04:01,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-18 13:04:01,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-18 13:04:01,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 13:04:01,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-18 13:04:01,898 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-18 13:04:01,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:04:01,899 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-18 13:04:01,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 13:04:01,899 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-18 13:04:01,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-18 13:04:01,899 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:04:01,900 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:04:01,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 13:04:01,900 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:04:01,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:04:01,900 INFO L82 PathProgramCache]: Analyzing trace with hash 866982410, now seen corresponding path program 25 times [2020-08-18 13:04:01,901 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:04:01,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1650416256] [2020-08-18 13:04:01,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:04:01,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:04:01,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:04:01,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:04:01,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:04:01,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:04:03,936 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:04:03,937 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1650416256] [2020-08-18 13:04:03,937 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:04:03,937 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 13:04:03,937 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262255257] [2020-08-18 13:04:03,937 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 13:04:03,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:04:03,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 13:04:03,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 13:04:03,939 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-18 13:04:04,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:04:04,285 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-18 13:04:04,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 13:04:04,286 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-18 13:04:04,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:04:04,287 INFO L225 Difference]: With dead ends: 122 [2020-08-18 13:04:04,287 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 13:04:04,288 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 13:04:04,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 13:04:04,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-18 13:04:04,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-18 13:04:04,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-18 13:04:04,293 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-18 13:04:04,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:04:04,293 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-18 13:04:04,293 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 13:04:04,293 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-18 13:04:04,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-18 13:04:04,294 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:04:04,294 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:04:04,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 13:04:04,294 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:04:04,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:04:04,295 INFO L82 PathProgramCache]: Analyzing trace with hash -1891773492, now seen corresponding path program 26 times [2020-08-18 13:04:04,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:04:04,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1072313808] [2020-08-18 13:04:04,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:04:04,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:04:04,358 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:04:04,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:04:04,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:04:04,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:04:06,474 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:04:06,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1072313808] [2020-08-18 13:04:06,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:04:06,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 13:04:06,475 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161694605] [2020-08-18 13:04:06,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 13:04:06,476 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:04:06,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 13:04:06,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 13:04:06,477 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-18 13:04:06,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:04:06,808 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-18 13:04:06,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 13:04:06,809 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-18 13:04:06,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:04:06,810 INFO L225 Difference]: With dead ends: 124 [2020-08-18 13:04:06,811 INFO L226 Difference]: Without dead ends: 102 [2020-08-18 13:04:06,812 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 13:04:06,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-18 13:04:06,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-18 13:04:06,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-18 13:04:06,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-18 13:04:06,817 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-18 13:04:06,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:04:06,817 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-18 13:04:06,817 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 13:04:06,817 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-18 13:04:06,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 13:04:06,818 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:04:06,818 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:04:06,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 13:04:06,819 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:04:06,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:04:06,819 INFO L82 PathProgramCache]: Analyzing trace with hash 1233593614, now seen corresponding path program 27 times [2020-08-18 13:04:06,819 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:04:06,819 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2107767101] [2020-08-18 13:04:06,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:04:06,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:04:06,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:04:06,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:04:06,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:04:06,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:04:09,098 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:04:09,098 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2107767101] [2020-08-18 13:04:09,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:04:09,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 13:04:09,099 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905358514] [2020-08-18 13:04:09,099 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 13:04:09,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:04:09,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 13:04:09,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 13:04:09,100 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-18 13:04:09,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:04:09,460 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-18 13:04:09,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 13:04:09,461 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-18 13:04:09,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:04:09,462 INFO L225 Difference]: With dead ends: 126 [2020-08-18 13:04:09,463 INFO L226 Difference]: Without dead ends: 104 [2020-08-18 13:04:09,464 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 13:04:09,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-18 13:04:09,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-18 13:04:09,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 13:04:09,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-18 13:04:09,468 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-18 13:04:09,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:04:09,469 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-18 13:04:09,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 13:04:09,469 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-18 13:04:09,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-18 13:04:09,469 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:04:09,469 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:04:09,470 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 13:04:09,470 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:04:09,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:04:09,470 INFO L82 PathProgramCache]: Analyzing trace with hash -1765724720, now seen corresponding path program 28 times [2020-08-18 13:04:09,470 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:04:09,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1931179138] [2020-08-18 13:04:09,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:04:09,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:04:09,536 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:04:09,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:04:09,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:04:09,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:04:11,918 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:04:11,919 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1931179138] [2020-08-18 13:04:11,919 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:04:11,919 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 13:04:11,919 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340160571] [2020-08-18 13:04:11,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 13:04:11,920 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:04:11,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 13:04:11,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 13:04:11,920 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-18 13:04:12,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:04:12,387 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-18 13:04:12,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 13:04:12,387 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-18 13:04:12,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:04:12,389 INFO L225 Difference]: With dead ends: 128 [2020-08-18 13:04:12,389 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 13:04:12,390 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 13:04:12,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 13:04:12,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-18 13:04:12,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-18 13:04:12,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-18 13:04:12,403 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-18 13:04:12,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:04:12,404 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-18 13:04:12,404 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 13:04:12,404 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-18 13:04:12,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-18 13:04:12,405 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:04:12,405 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:04:12,405 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 13:04:12,405 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:04:12,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:04:12,406 INFO L82 PathProgramCache]: Analyzing trace with hash 2107379218, now seen corresponding path program 29 times [2020-08-18 13:04:12,406 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:04:12,406 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [281806474] [2020-08-18 13:04:12,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:04:12,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:04:12,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:04:12,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:04:12,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:04:12,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:04:14,940 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:04:14,940 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [281806474] [2020-08-18 13:04:14,940 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:04:14,940 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 13:04:14,940 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882138907] [2020-08-18 13:04:14,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 13:04:14,941 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:04:14,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 13:04:14,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 13:04:14,942 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-18 13:04:15,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:04:15,522 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-18 13:04:15,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 13:04:15,522 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-18 13:04:15,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:04:15,523 INFO L225 Difference]: With dead ends: 130 [2020-08-18 13:04:15,524 INFO L226 Difference]: Without dead ends: 108 [2020-08-18 13:04:15,525 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 13:04:15,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-18 13:04:15,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-18 13:04:15,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-18 13:04:15,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-18 13:04:15,530 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-18 13:04:15,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:04:15,530 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-18 13:04:15,530 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 13:04:15,530 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-18 13:04:15,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-18 13:04:15,531 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:04:15,531 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:04:15,531 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 13:04:15,531 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:04:15,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:04:15,532 INFO L82 PathProgramCache]: Analyzing trace with hash 423618004, now seen corresponding path program 30 times [2020-08-18 13:04:15,532 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:04:15,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [348643077] [2020-08-18 13:04:15,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:04:15,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:04:15,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:04:15,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:04:15,609 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:04:15,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:04:18,145 INFO L134 CoverageAnalysis]: Checked inductivity of 1449 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 13:04:18,146 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [348643077] [2020-08-18 13:04:18,146 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 13:04:18,146 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 13:04:18,146 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025051035] [2020-08-18 13:04:18,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 13:04:18,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 13:04:18,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 13:04:18,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=826, Invalid=1066, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 13:04:18,149 INFO L87 Difference]: Start difference. First operand 107 states and 110 transitions. Second operand 44 states. [2020-08-18 13:04:18,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 13:04:18,541 INFO L93 Difference]: Finished difference Result 132 states and 138 transitions. [2020-08-18 13:04:18,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 13:04:18,541 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 102 [2020-08-18 13:04:18,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 13:04:18,543 INFO L225 Difference]: With dead ends: 132 [2020-08-18 13:04:18,543 INFO L226 Difference]: Without dead ends: 110 [2020-08-18 13:04:18,544 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=916, Invalid=1246, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 13:04:18,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-18 13:04:18,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-08-18 13:04:18,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-18 13:04:18,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 112 transitions. [2020-08-18 13:04:18,549 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 112 transitions. Word has length 102 [2020-08-18 13:04:18,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 13:04:18,550 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 112 transitions. [2020-08-18 13:04:18,550 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 13:04:18,550 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 112 transitions. [2020-08-18 13:04:18,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-18 13:04:18,551 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 13:04:18,551 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 13:04:18,551 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-18 13:04:18,551 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 13:04:18,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 13:04:18,552 INFO L82 PathProgramCache]: Analyzing trace with hash 1531761942, now seen corresponding path program 31 times [2020-08-18 13:04:18,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 13:04:18,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1785116362] [2020-08-18 13:04:18,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 13:04:18,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:04:18,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 13:04:18,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 13:04:18,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 13:04:18,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat