/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=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.8 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 01:58:46,570 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 01:58:46,572 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 01:58:46,596 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 01:58:46,597 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 01:58:46,598 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 01:58:46,599 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 01:58:46,601 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 01:58:46,602 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 01:58:46,603 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 01:58:46,604 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 01:58:46,605 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 01:58:46,606 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 01:58:46,613 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 01:58:46,614 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 01:58:46,615 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 01:58:46,616 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 01:58:46,619 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 01:58:46,621 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 01:58:46,624 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 01:58:46,625 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 01:58:46,626 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 01:58:46,629 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 01:58:46,630 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 01:58:46,633 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 01:58:46,646 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 01:58:46,656 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 01:58:46,657 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 01:58:46,660 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-19 01:58:46,706 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 01:58:46,706 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 01:58:46,709 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 01:58:46,710 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 01:58:46,710 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 01:58:46,710 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 01:58:46,711 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 01:58:46,711 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 01:58:46,711 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 01:58:46,711 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 01:58:46,711 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 01:58:46,712 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 01:58:46,712 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 01:58:46,712 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 01:58:46,712 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 01:58:46,712 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 01:58:46,712 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 01:58:46,714 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 01:58:46,715 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 01:58:46,715 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 01:58:46,715 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 01:58:46,715 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 01:58:46,715 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 01:58:46,716 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 01:58:46,716 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 01:58:46,716 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 01:58:46,716 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 01:58:46,716 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 01:58:46,717 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 01:58:46,717 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=WIDESTAMONGSMALL;tolerance=0.8; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8; [2020-08-19 01:58:47,047 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 01:58:47,059 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 01:58:47,063 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 01:58:47,064 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 01:58:47,065 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 01:58:47,065 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-19 01:58:47,128 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cc50d2adf/5937cfd1f96d46a89f2cf428b3a3cd0d/FLAGc1e39fe17 [2020-08-19 01:58:47,604 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 01:58:47,604 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-19 01:58:47,609 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cc50d2adf/5937cfd1f96d46a89f2cf428b3a3cd0d/FLAGc1e39fe17 [2020-08-19 01:58:47,969 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cc50d2adf/5937cfd1f96d46a89f2cf428b3a3cd0d [2020-08-19 01:58:47,981 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 01:58:47,983 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 01:58:47,984 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 01:58:47,984 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 01:58:47,987 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 01:58:47,988 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 01:58:47" (1/1) ... [2020-08-19 01:58:47,992 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@21189eed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:58:47, skipping insertion in model container [2020-08-19 01:58:47,992 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 01:58:47" (1/1) ... [2020-08-19 01:58:48,000 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 01:58:48,019 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 01:58:48,240 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 01:58:48,249 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 01:58:48,271 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 01:58:48,370 INFO L208 MainTranslator]: Completed translation [2020-08-19 01:58:48,371 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:58:48 WrapperNode [2020-08-19 01:58:48,371 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 01:58:48,372 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 01:58:48,372 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 01:58:48,372 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 01:58:48,382 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:58:48" (1/1) ... [2020-08-19 01:58:48,382 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:58:48" (1/1) ... [2020-08-19 01:58:48,391 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:58:48" (1/1) ... [2020-08-19 01:58:48,391 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:58:48" (1/1) ... [2020-08-19 01:58:48,400 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:58:48" (1/1) ... [2020-08-19 01:58:48,405 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:58:48" (1/1) ... [2020-08-19 01:58:48,406 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:58:48" (1/1) ... [2020-08-19 01:58:48,409 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 01:58:48,409 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 01:58:48,409 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 01:58:48,409 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 01:58:48,410 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:58:48" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 01:58:48,475 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 01:58:48,476 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 01:58:48,476 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-19 01:58:48,476 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 01:58:48,476 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 01:58:48,477 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-19 01:58:48,477 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-19 01:58:48,477 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-19 01:58:48,477 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-19 01:58:48,478 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 01:58:48,479 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-19 01:58:48,479 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-19 01:58:48,479 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-19 01:58:48,479 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-19 01:58:48,479 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 01:58:48,480 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 01:58:48,758 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 01:58:48,759 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-19 01:58:48,763 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 01:58:48 BoogieIcfgContainer [2020-08-19 01:58:48,764 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 01:58:48,765 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 01:58:48,765 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 01:58:48,768 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 01:58:48,768 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 01:58:47" (1/3) ... [2020-08-19 01:58:48,769 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d40a891 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 01:58:48, skipping insertion in model container [2020-08-19 01:58:48,769 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:58:48" (2/3) ... [2020-08-19 01:58:48,770 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d40a891 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 01:58:48, skipping insertion in model container [2020-08-19 01:58:48,770 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 01:58:48" (3/3) ... [2020-08-19 01:58:48,772 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2020-08-19 01:58:48,783 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 01:58:48,791 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 01:58:48,808 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 01:58:48,836 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 01:58:48,836 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 01:58:48,836 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 01:58:48,836 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 01:58:48,836 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 01:58:48,837 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 01:58:48,837 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 01:58:48,837 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 01:58:48,857 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-19 01:58:48,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-19 01:58:48,863 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:58:48,864 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:58:48,864 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:58:48,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:58:48,871 INFO L82 PathProgramCache]: Analyzing trace with hash -899836778, now seen corresponding path program 1 times [2020-08-19 01:58:48,881 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:58:48,881 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1280165493] [2020-08-19 01:58:48,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:58:48,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:49,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:58:49,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:49,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 01:58:49,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:49,077 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:58:49,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1280165493] [2020-08-19 01:58:49,080 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 01:58:49,080 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 01:58:49,081 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908901382] [2020-08-19 01:58:49,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 01:58:49,086 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:58:49,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 01:58:49,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 01:58:49,100 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-19 01:58:49,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:58:49,199 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-08-19 01:58:49,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 01:58:49,201 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-19 01:58:49,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:58:49,210 INFO L225 Difference]: With dead ends: 42 [2020-08-19 01:58:49,211 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 01:58:49,214 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 01:58:49,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 01:58:49,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-19 01:58:49,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 01:58:49,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-19 01:58:49,249 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-19 01:58:49,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:58:49,249 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-19 01:58:49,249 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 01:58:49,250 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-19 01:58:49,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-19 01:58:49,251 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:58:49,251 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:58:49,251 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 01:58:49,251 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:58:49,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:58:49,252 INFO L82 PathProgramCache]: Analyzing trace with hash -1137678901, now seen corresponding path program 1 times [2020-08-19 01:58:49,252 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:58:49,253 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1129665861] [2020-08-19 01:58:49,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:58:49,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:49,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:58:49,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:49,336 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-19 01:58:49,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:49,346 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:58:49,346 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1129665861] [2020-08-19 01:58:49,347 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 01:58:49,347 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 01:58:49,347 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676168553] [2020-08-19 01:58:49,349 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 01:58:49,349 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:58:49,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 01:58:49,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 01:58:49,350 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-19 01:58:49,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:58:49,409 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-19 01:58:49,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 01:58:49,410 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-19 01:58:49,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:58:49,411 INFO L225 Difference]: With dead ends: 34 [2020-08-19 01:58:49,411 INFO L226 Difference]: Without dead ends: 22 [2020-08-19 01:58:49,412 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 01:58:49,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-19 01:58:49,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-19 01:58:49,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 01:58:49,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-19 01:58:49,419 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-19 01:58:49,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:58:49,420 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-19 01:58:49,420 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 01:58:49,420 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-19 01:58:49,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 01:58:49,421 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:58:49,421 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] [2020-08-19 01:58:49,421 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 01:58:49,422 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:58:49,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:58:49,422 INFO L82 PathProgramCache]: Analyzing trace with hash 278779309, now seen corresponding path program 1 times [2020-08-19 01:58:49,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:58:49,423 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1434361258] [2020-08-19 01:58:49,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:58:49,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:49,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:58:49,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:49,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-19 01:58:49,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:49,522 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:58:49,523 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1434361258] [2020-08-19 01:58:49,523 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:58:49,523 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 01:58:49,523 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770571452] [2020-08-19 01:58:49,524 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 01:58:49,524 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:58:49,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 01:58:49,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-19 01:58:49,525 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-19 01:58:49,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:58:49,595 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-19 01:58:49,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 01:58:49,596 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-19 01:58:49,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:58:49,597 INFO L225 Difference]: With dead ends: 36 [2020-08-19 01:58:49,597 INFO L226 Difference]: Without dead ends: 24 [2020-08-19 01:58:49,598 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-19 01:58:49,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-19 01:58:49,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-19 01:58:49,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-19 01:58:49,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-19 01:58:49,605 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-19 01:58:49,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:58:49,606 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-19 01:58:49,606 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 01:58:49,606 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-19 01:58:49,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 01:58:49,607 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:58:49,607 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] [2020-08-19 01:58:49,608 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 01:58:49,608 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:58:49,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:58:49,609 INFO L82 PathProgramCache]: Analyzing trace with hash -9513713, now seen corresponding path program 2 times [2020-08-19 01:58:49,609 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:58:49,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1715337639] [2020-08-19 01:58:49,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:58:49,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:49,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:58:49,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:49,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-19 01:58:49,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:49,734 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:58:49,737 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1715337639] [2020-08-19 01:58:49,738 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:58:49,738 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 01:58:49,738 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [716979488] [2020-08-19 01:58:49,739 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 01:58:49,739 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:58:49,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 01:58:49,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-19 01:58:49,744 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-19 01:58:49,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:58:49,854 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-19 01:58:49,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 01:58:49,854 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-19 01:58:49,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:58:49,855 INFO L225 Difference]: With dead ends: 38 [2020-08-19 01:58:49,856 INFO L226 Difference]: Without dead ends: 26 [2020-08-19 01:58:49,856 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-19 01:58:49,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-19 01:58:49,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-19 01:58:49,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-19 01:58:49,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-19 01:58:49,862 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-19 01:58:49,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:58:49,863 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-19 01:58:49,863 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 01:58:49,863 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-19 01:58:49,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 01:58:49,864 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:58:49,864 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] [2020-08-19 01:58:49,865 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 01:58:49,865 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:58:49,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:58:49,865 INFO L82 PathProgramCache]: Analyzing trace with hash 2113766385, now seen corresponding path program 3 times [2020-08-19 01:58:49,866 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:58:49,866 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [385572532] [2020-08-19 01:58:49,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:58:49,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:49,952 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:58:49,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:49,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-19 01:58:49,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:49,962 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:58:49,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [385572532] [2020-08-19 01:58:49,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:58:49,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 01:58:49,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500118032] [2020-08-19 01:58:49,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 01:58:49,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:58:49,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 01:58:49,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-19 01:58:49,965 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-19 01:58:50,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:58:50,046 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-19 01:58:50,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 01:58:50,046 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-19 01:58:50,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:58:50,047 INFO L225 Difference]: With dead ends: 40 [2020-08-19 01:58:50,048 INFO L226 Difference]: Without dead ends: 28 [2020-08-19 01:58:50,048 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-19 01:58:50,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-19 01:58:50,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-19 01:58:50,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-19 01:58:50,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-19 01:58:50,054 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-19 01:58:50,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:58:50,055 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-19 01:58:50,055 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 01:58:50,055 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-19 01:58:50,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-19 01:58:50,056 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:58:50,056 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] [2020-08-19 01:58:50,056 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 01:58:50,057 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:58:50,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:58:50,057 INFO L82 PathProgramCache]: Analyzing trace with hash -1818492333, now seen corresponding path program 4 times [2020-08-19 01:58:50,057 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:58:50,058 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1037551839] [2020-08-19 01:58:50,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:58:50,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:50,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:58:50,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:50,180 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-19 01:58:50,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:50,185 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:58:50,185 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1037551839] [2020-08-19 01:58:50,186 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:58:50,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 01:58:50,186 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961173385] [2020-08-19 01:58:50,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 01:58:50,187 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:58:50,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 01:58:50,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-19 01:58:50,188 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-19 01:58:50,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:58:50,271 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-19 01:58:50,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 01:58:50,272 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-19 01:58:50,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:58:50,273 INFO L225 Difference]: With dead ends: 42 [2020-08-19 01:58:50,273 INFO L226 Difference]: Without dead ends: 30 [2020-08-19 01:58:50,274 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-19 01:58:50,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-19 01:58:50,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-19 01:58:50,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 01:58:50,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-19 01:58:50,280 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-19 01:58:50,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:58:50,280 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-19 01:58:50,280 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 01:58:50,281 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-19 01:58:50,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 01:58:50,281 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:58:50,282 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] [2020-08-19 01:58:50,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 01:58:50,282 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:58:50,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:58:50,283 INFO L82 PathProgramCache]: Analyzing trace with hash -1147899851, now seen corresponding path program 5 times [2020-08-19 01:58:50,283 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:58:50,283 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [919585777] [2020-08-19 01:58:50,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:58:50,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:50,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:58:50,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:50,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-19 01:58:50,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:50,416 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:58:50,416 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [919585777] [2020-08-19 01:58:50,417 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:58:50,417 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 01:58:50,417 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882682283] [2020-08-19 01:58:50,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 01:58:50,419 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:58:50,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 01:58:50,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-19 01:58:50,420 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-19 01:58:50,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:58:50,523 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-19 01:58:50,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 01:58:50,524 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-19 01:58:50,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:58:50,525 INFO L225 Difference]: With dead ends: 44 [2020-08-19 01:58:50,525 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 01:58:50,526 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-19 01:58:50,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 01:58:50,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-19 01:58:50,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 01:58:50,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-19 01:58:50,535 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-19 01:58:50,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:58:50,535 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-19 01:58:50,535 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 01:58:50,535 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-19 01:58:50,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-19 01:58:50,538 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:58:50,539 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] [2020-08-19 01:58:50,539 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 01:58:50,539 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:58:50,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:58:50,540 INFO L82 PathProgramCache]: Analyzing trace with hash -953619049, now seen corresponding path program 6 times [2020-08-19 01:58:50,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:58:50,541 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1964077171] [2020-08-19 01:58:50,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:58:50,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:50,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:58:50,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:50,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-19 01:58:50,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:50,707 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:58:50,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1964077171] [2020-08-19 01:58:50,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:58:50,708 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 01:58:50,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427684271] [2020-08-19 01:58:50,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 01:58:50,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:58:50,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 01:58:50,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-19 01:58:50,710 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-19 01:58:50,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:58:50,794 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-19 01:58:50,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 01:58:50,795 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-19 01:58:50,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:58:50,796 INFO L225 Difference]: With dead ends: 46 [2020-08-19 01:58:50,796 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 01:58:50,797 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-19 01:58:50,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 01:58:50,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-19 01:58:50,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 01:58:50,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-19 01:58:50,803 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-19 01:58:50,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:58:50,804 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-19 01:58:50,804 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 01:58:50,804 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-19 01:58:50,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 01:58:50,805 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:58:50,805 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] [2020-08-19 01:58:50,805 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 01:58:50,805 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:58:50,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:58:50,806 INFO L82 PathProgramCache]: Analyzing trace with hash 1066637945, now seen corresponding path program 7 times [2020-08-19 01:58:50,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:58:50,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [563905061] [2020-08-19 01:58:50,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:58:50,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:50,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:58:50,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:50,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-19 01:58:50,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:50,992 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:58:50,993 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [563905061] [2020-08-19 01:58:50,993 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:58:50,993 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 01:58:50,994 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997456517] [2020-08-19 01:58:50,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 01:58:50,994 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:58:50,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 01:58:50,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-19 01:58:50,995 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-19 01:58:51,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:58:51,105 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-19 01:58:51,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 01:58:51,106 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-19 01:58:51,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:58:51,107 INFO L225 Difference]: With dead ends: 48 [2020-08-19 01:58:51,107 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 01:58:51,108 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-19 01:58:51,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 01:58:51,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-19 01:58:51,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 01:58:51,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-19 01:58:51,113 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-19 01:58:51,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:58:51,113 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-19 01:58:51,113 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 01:58:51,114 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-19 01:58:51,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 01:58:51,114 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:58:51,115 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] [2020-08-19 01:58:51,115 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 01:58:51,115 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:58:51,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:58:51,115 INFO L82 PathProgramCache]: Analyzing trace with hash 1208391387, now seen corresponding path program 8 times [2020-08-19 01:58:51,116 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:58:51,116 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1371852501] [2020-08-19 01:58:51,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:58:51,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:51,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:58:51,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:51,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-19 01:58:51,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:51,244 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:58:51,244 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1371852501] [2020-08-19 01:58:51,244 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:58:51,244 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 01:58:51,245 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828114260] [2020-08-19 01:58:51,245 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 01:58:51,245 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:58:51,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 01:58:51,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-19 01:58:51,246 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-19 01:58:51,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:58:51,334 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-19 01:58:51,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 01:58:51,334 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-19 01:58:51,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:58:51,335 INFO L225 Difference]: With dead ends: 50 [2020-08-19 01:58:51,335 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 01:58:51,336 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-19 01:58:51,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 01:58:51,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-19 01:58:51,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 01:58:51,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-19 01:58:51,341 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-19 01:58:51,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:58:51,341 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-19 01:58:51,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 01:58:51,342 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-19 01:58:51,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 01:58:51,343 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:58:51,343 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] [2020-08-19 01:58:51,343 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 01:58:51,343 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:58:51,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:58:51,344 INFO L82 PathProgramCache]: Analyzing trace with hash -5504323, now seen corresponding path program 9 times [2020-08-19 01:58:51,344 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:58:51,344 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1755970887] [2020-08-19 01:58:51,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:58:51,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:51,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:58:51,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:51,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-19 01:58:51,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:58:51,487 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:58:51,488 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1755970887] [2020-08-19 01:58:51,488 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:58:51,488 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 01:58:51,488 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900010476] [2020-08-19 01:58:51,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 01:58:51,489 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:58:51,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 01:58:51,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-19 01:58:51,490 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-19 01:58:51,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:58:51,594 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-08-19 01:58:51,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 01:58:51,594 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-19 01:58:51,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:58:51,595 INFO L225 Difference]: With dead ends: 51 [2020-08-19 01:58:51,595 INFO L226 Difference]: Without dead ends: 39 [2020-08-19 01:58:51,596 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-19 01:58:51,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-19 01:58:51,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-19 01:58:51,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 01:58:51,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-19 01:58:51,601 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-19 01:58:51,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:58:51,601 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-19 01:58:51,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 01:58:51,601 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-19 01:58:51,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 01:58:51,602 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:58:51,602 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:58:51,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 01:58:51,603 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:58:51,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:58:51,603 INFO L82 PathProgramCache]: Analyzing trace with hash 1671822879, now seen corresponding path program 10 times [2020-08-19 01:58:51,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:58:51,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [279274787] [2020-08-19 01:58:51,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:58:51,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:59:01,211 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 8 [2020-08-19 01:59:02,224 WARN L193 SmtUtils]: Spent 809.00 ms on a formula simplification. DAG size of input: 567 DAG size of output: 11 [2020-08-19 01:59:06,257 WARN L193 SmtUtils]: Spent 3.63 s on a formula simplification. DAG size of input: 1063 DAG size of output: 8 [2020-08-19 01:59:33,684 WARN L193 SmtUtils]: Spent 26.62 s on a formula simplification. DAG size of input: 2458 DAG size of output: 8 [2020-08-19 01:59:34,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:59:34,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:59:34,043 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-19 01:59:34,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:59:34,050 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-19 01:59:34,051 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [279274787] [2020-08-19 01:59:34,051 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:59:34,051 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 01:59:34,052 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982493210] [2020-08-19 01:59:34,052 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 01:59:34,056 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:59:34,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 01:59:34,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2020-08-19 01:59:34,057 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 16 states. [2020-08-19 01:59:34,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:59:34,541 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-19 01:59:34,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 01:59:34,542 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-19 01:59:34,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:59:34,544 INFO L225 Difference]: With dead ends: 49 [2020-08-19 01:59:34,544 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 01:59:34,545 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 32.6s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-19 01:59:34,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 01:59:34,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-19 01:59:34,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 01:59:34,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-19 01:59:34,554 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-19 01:59:34,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:59:34,555 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-19 01:59:34,555 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 01:59:34,555 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-19 01:59:34,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 01:59:34,558 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:59:34,558 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:59:34,558 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 01:59:34,559 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:59:34,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:59:34,559 INFO L82 PathProgramCache]: Analyzing trace with hash 443458522, now seen corresponding path program 1 times [2020-08-19 01:59:34,559 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:59:34,559 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [232390218] [2020-08-19 01:59:34,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:59:34,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:59:38,569 WARN L193 SmtUtils]: Spent 296.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 8 [2020-08-19 01:59:39,604 WARN L193 SmtUtils]: Spent 848.00 ms on a formula simplification. DAG size of input: 401 DAG size of output: 8 [2020-08-19 01:59:43,811 WARN L193 SmtUtils]: Spent 3.75 s on a formula simplification. DAG size of input: 830 DAG size of output: 8 [2020-08-19 01:59:44,010 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 45 [2020-08-19 01:59:44,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:59:44,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:59:44,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-19 01:59:44,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:59:44,425 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 101 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-19 01:59:44,425 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [232390218] [2020-08-19 01:59:44,425 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:59:44,426 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 01:59:44,430 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486023594] [2020-08-19 01:59:44,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 01:59:44,431 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:59:44,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 01:59:44,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2020-08-19 01:59:44,432 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 21 states. [2020-08-19 01:59:45,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:59:45,398 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-19 01:59:45,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 01:59:45,399 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2020-08-19 01:59:45,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:59:45,401 INFO L225 Difference]: With dead ends: 48 [2020-08-19 01:59:45,401 INFO L226 Difference]: Without dead ends: 43 [2020-08-19 01:59:45,402 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=94, Invalid=718, Unknown=0, NotChecked=0, Total=812 [2020-08-19 01:59:45,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-19 01:59:45,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-19 01:59:45,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 01:59:45,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-19 01:59:45,411 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-19 01:59:45,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:59:45,411 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-19 01:59:45,411 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 01:59:45,411 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-19 01:59:45,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 01:59:45,412 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:59:45,412 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:59:45,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 01:59:45,413 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:59:45,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:59:45,413 INFO L82 PathProgramCache]: Analyzing trace with hash 1101317845, now seen corresponding path program 2 times [2020-08-19 01:59:45,413 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:59:45,414 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1296330542] [2020-08-19 01:59:45,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:59:45,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat