/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 04:31:17,016 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 04:31:17,019 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 04:31:17,044 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 04:31:17,044 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 04:31:17,045 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 04:31:17,047 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 04:31:17,049 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 04:31:17,050 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 04:31:17,051 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 04:31:17,052 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 04:31:17,053 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 04:31:17,053 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 04:31:17,054 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 04:31:17,055 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 04:31:17,056 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 04:31:17,057 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 04:31:17,058 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 04:31:17,060 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 04:31:17,062 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 04:31:17,063 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 04:31:17,065 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 04:31:17,066 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 04:31:17,067 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 04:31:17,070 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 04:31:17,078 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 04:31:17,078 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 04:31:17,079 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 04:31:17,080 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 04:31:17,110 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 04:31:17,111 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 04:31:17,112 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 04:31:17,112 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 04:31:17,112 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 04:31:17,113 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 04:31:17,113 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 04:31:17,113 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 04:31:17,113 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 04:31:17,114 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 04:31:17,114 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 04:31:17,114 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 04:31:17,114 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 04:31:17,114 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 04:31:17,115 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 04:31:17,115 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 04:31:17,115 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 04:31:17,115 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 04:31:17,115 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 04:31:17,116 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 04:31:17,116 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 04:31:17,116 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 04:31:17,116 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 04:31:17,116 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 04:31:17,117 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 04:31:17,117 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 04:31:17,117 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 04:31:17,117 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 04:31:17,117 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 04:31:17,118 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2; [2020-08-19 04:31:17,403 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 04:31:17,414 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 04:31:17,418 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 04:31:17,419 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 04:31:17,420 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 04:31:17,420 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-19 04:31:17,498 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b5d70a858/9797feca173849c793dfb19ec8e6c700/FLAG86f4716b8 [2020-08-19 04:31:17,960 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 04:31:17,961 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-19 04:31:17,966 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b5d70a858/9797feca173849c793dfb19ec8e6c700/FLAG86f4716b8 [2020-08-19 04:31:18,325 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b5d70a858/9797feca173849c793dfb19ec8e6c700 [2020-08-19 04:31:18,334 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 04:31:18,336 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 04:31:18,337 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 04:31:18,337 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 04:31:18,341 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 04:31:18,342 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 04:31:18" (1/1) ... [2020-08-19 04:31:18,346 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f159ca9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:18, skipping insertion in model container [2020-08-19 04:31:18,346 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 04:31:18" (1/1) ... [2020-08-19 04:31:18,355 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 04:31:18,377 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 04:31:18,624 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 04:31:18,629 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 04:31:18,651 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 04:31:18,667 INFO L208 MainTranslator]: Completed translation [2020-08-19 04:31:18,668 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:18 WrapperNode [2020-08-19 04:31:18,668 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 04:31:18,669 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 04:31:18,669 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 04:31:18,669 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 04:31:18,684 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:18" (1/1) ... [2020-08-19 04:31:18,684 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:18" (1/1) ... [2020-08-19 04:31:18,690 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:18" (1/1) ... [2020-08-19 04:31:18,690 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:18" (1/1) ... [2020-08-19 04:31:18,833 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:18" (1/1) ... [2020-08-19 04:31:18,840 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:18" (1/1) ... [2020-08-19 04:31:18,841 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:18" (1/1) ... [2020-08-19 04:31:18,843 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 04:31:18,844 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 04:31:18,844 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 04:31:18,844 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 04:31:18,851 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:18" (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 04:31:18,927 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 04:31:18,927 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 04:31:18,927 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-19 04:31:18,927 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 04:31:18,928 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 04:31:18,928 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 04:31:18,928 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-19 04:31:18,928 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-19 04:31:18,928 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 04:31:18,929 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-19 04:31:18,929 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 04:31:18,929 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 04:31:18,929 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 04:31:19,129 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 04:31:19,130 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-19 04:31:19,134 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 04:31:19 BoogieIcfgContainer [2020-08-19 04:31:19,135 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 04:31:19,136 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 04:31:19,136 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 04:31:19,139 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 04:31:19,139 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 04:31:18" (1/3) ... [2020-08-19 04:31:19,140 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b5b6844 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 04:31:19, skipping insertion in model container [2020-08-19 04:31:19,141 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:18" (2/3) ... [2020-08-19 04:31:19,141 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b5b6844 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 04:31:19, skipping insertion in model container [2020-08-19 04:31:19,141 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 04:31:19" (3/3) ... [2020-08-19 04:31:19,143 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-19 04:31:19,154 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 04:31:19,162 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 04:31:19,177 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 04:31:19,211 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 04:31:19,212 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 04:31:19,212 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 04:31:19,212 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 04:31:19,212 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 04:31:19,213 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 04:31:19,213 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 04:31:19,213 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 04:31:19,239 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-19 04:31:19,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 04:31:19,246 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:19,247 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:19,248 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:19,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:19,256 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-19 04:31:19,268 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:19,268 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [883962500] [2020-08-19 04:31:19,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:19,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:19,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:19,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:19,443 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 04:31:19,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [883962500] [2020-08-19 04:31:19,446 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 04:31:19,446 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-19 04:31:19,447 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233500595] [2020-08-19 04:31:19,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-19 04:31:19,453 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:19,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-19 04:31:19,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-19 04:31:19,470 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-19 04:31:19,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:19,494 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-19 04:31:19,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-19 04:31:19,495 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-19 04:31:19,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:19,507 INFO L225 Difference]: With dead ends: 35 [2020-08-19 04:31:19,507 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 04:31:19,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-19 04:31:19,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 04:31:19,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 04:31:19,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 04:31:19,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-19 04:31:19,553 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-19 04:31:19,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:19,553 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-19 04:31:19,554 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-19 04:31:19,554 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-19 04:31:19,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 04:31:19,555 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:19,555 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:19,555 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 04:31:19,556 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:19,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:19,556 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-19 04:31:19,557 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:19,557 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1568125426] [2020-08-19 04:31:19,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:19,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:19,603 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:19,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:19,608 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 04:31:19,608 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1568125426] [2020-08-19 04:31:19,609 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 04:31:19,609 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 04:31:19,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687377176] [2020-08-19 04:31:19,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 04:31:19,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:19,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 04:31:19,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 04:31:19,612 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-19 04:31:19,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:19,626 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-19 04:31:19,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 04:31:19,627 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-19 04:31:19,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:19,628 INFO L225 Difference]: With dead ends: 24 [2020-08-19 04:31:19,628 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 04:31:19,629 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 04:31:19,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 04:31:19,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 04:31:19,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 04:31:19,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-19 04:31:19,634 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-19 04:31:19,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:19,635 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-19 04:31:19,635 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 04:31:19,635 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-19 04:31:19,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 04:31:19,636 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:19,636 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:19,636 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 04:31:19,636 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:19,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:19,637 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-19 04:31:19,637 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:19,638 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1006890489] [2020-08-19 04:31:19,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:19,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:19,876 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:19,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:19,883 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 04:31:19,884 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1006890489] [2020-08-19 04:31:19,884 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 04:31:19,884 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 04:31:19,885 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243913148] [2020-08-19 04:31:19,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 04:31:19,885 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:19,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 04:31:19,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 04:31:19,886 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-19 04:31:19,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:19,923 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-19 04:31:19,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 04:31:19,924 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-19 04:31:19,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:19,925 INFO L225 Difference]: With dead ends: 23 [2020-08-19 04:31:19,925 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 04:31:19,926 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-19 04:31:19,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 04:31:19,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 04:31:19,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 04:31:19,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-19 04:31:19,931 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-19 04:31:19,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:19,931 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-19 04:31:19,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 04:31:19,932 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-19 04:31:19,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 04:31:19,932 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:19,933 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:19,933 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 04:31:19,933 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:19,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:19,934 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-19 04:31:19,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:19,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [206757083] [2020-08-19 04:31:19,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:19,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:20,189 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 15 [2020-08-19 04:31:20,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:20,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:20,201 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:20,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [206757083] [2020-08-19 04:31:20,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 04:31:20,202 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 04:31:20,203 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517307904] [2020-08-19 04:31:20,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 04:31:20,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:20,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 04:31:20,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 04:31:20,204 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-19 04:31:20,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:20,225 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-19 04:31:20,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 04:31:20,226 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-19 04:31:20,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:20,227 INFO L225 Difference]: With dead ends: 26 [2020-08-19 04:31:20,227 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 04:31:20,228 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 04:31:20,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 04:31:20,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 04:31:20,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 04:31:20,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-19 04:31:20,233 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-19 04:31:20,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:20,234 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-19 04:31:20,234 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 04:31:20,234 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-19 04:31:20,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 04:31:20,235 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:20,235 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:20,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 04:31:20,235 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:20,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:20,236 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-19 04:31:20,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:20,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1512297730] [2020-08-19 04:31:20,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:20,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:20,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:20,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:20,456 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:20,457 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1512297730] [2020-08-19 04:31:20,457 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:20,457 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 04:31:20,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696206968] [2020-08-19 04:31:20,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 04:31:20,459 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:20,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 04:31:20,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-19 04:31:20,460 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-19 04:31:20,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:20,575 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-19 04:31:20,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 04:31:20,576 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-19 04:31:20,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:20,577 INFO L225 Difference]: With dead ends: 26 [2020-08-19 04:31:20,577 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 04:31:20,578 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-19 04:31:20,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 04:31:20,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-19 04:31:20,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 04:31:20,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-19 04:31:20,584 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-19 04:31:20,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:20,584 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-19 04:31:20,584 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 04:31:20,585 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-19 04:31:20,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 04:31:20,585 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:20,585 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:20,586 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 04:31:20,586 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:20,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:20,587 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-19 04:31:20,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:20,587 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1032899365] [2020-08-19 04:31:20,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:20,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:20,834 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:20,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:20,838 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:20,839 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1032899365] [2020-08-19 04:31:20,839 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:20,839 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 04:31:20,840 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079810801] [2020-08-19 04:31:20,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 04:31:20,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:20,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 04:31:20,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-19 04:31:20,841 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-19 04:31:20,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:20,972 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-19 04:31:20,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 04:31:20,973 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-19 04:31:20,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:20,974 INFO L225 Difference]: With dead ends: 29 [2020-08-19 04:31:20,974 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 04:31:20,975 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-19 04:31:20,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 04:31:20,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-19 04:31:20,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-19 04:31:20,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-19 04:31:20,980 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-19 04:31:20,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:20,980 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-19 04:31:20,980 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 04:31:20,980 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-19 04:31:20,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 04:31:20,981 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:20,981 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:20,982 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 04:31:20,982 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:20,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:20,982 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-19 04:31:20,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:20,983 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [665818377] [2020-08-19 04:31:20,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:21,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:21,283 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:21,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:21,287 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:21,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [665818377] [2020-08-19 04:31:21,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:21,288 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 04:31:21,289 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646455572] [2020-08-19 04:31:21,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 04:31:21,290 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:21,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 04:31:21,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-19 04:31:21,291 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-19 04:31:27,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:27,743 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-19 04:31:27,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 04:31:27,743 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-19 04:31:27,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:27,744 INFO L225 Difference]: With dead ends: 32 [2020-08-19 04:31:27,745 INFO L226 Difference]: Without dead ends: 26 [2020-08-19 04:31:27,745 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=33, Invalid=148, Unknown=1, NotChecked=0, Total=182 [2020-08-19 04:31:27,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-19 04:31:27,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-19 04:31:27,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-19 04:31:27,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-19 04:31:27,751 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-19 04:31:27,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:27,751 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-19 04:31:27,751 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 04:31:27,751 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-19 04:31:27,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-19 04:31:27,752 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:27,752 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:27,753 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 04:31:27,753 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:27,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:27,754 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-19 04:31:27,754 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:27,754 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1090384804] [2020-08-19 04:31:27,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:27,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:28,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:28,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:28,099 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:28,099 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1090384804] [2020-08-19 04:31:28,100 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:28,100 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 04:31:28,100 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595678034] [2020-08-19 04:31:28,101 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 04:31:28,101 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:28,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 04:31:28,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-19 04:31:28,102 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-19 04:31:28,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:28,351 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-19 04:31:28,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 04:31:28,351 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-19 04:31:28,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:28,352 INFO L225 Difference]: With dead ends: 35 [2020-08-19 04:31:28,353 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 04:31:28,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2020-08-19 04:31:28,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 04:31:28,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-19 04:31:28,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 04:31:28,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-19 04:31:28,358 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-19 04:31:28,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:28,358 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-19 04:31:28,358 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 04:31:28,358 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-19 04:31:28,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 04:31:28,359 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:28,359 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:28,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 04:31:28,360 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:28,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:28,360 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-19 04:31:28,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:28,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [422336687] [2020-08-19 04:31:28,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:28,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:28,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:28,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:28,719 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:28,719 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [422336687] [2020-08-19 04:31:28,720 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:28,720 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 04:31:28,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403222330] [2020-08-19 04:31:28,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 04:31:28,721 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:28,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 04:31:28,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-19 04:31:28,722 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-19 04:31:33,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:33,179 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-19 04:31:33,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 04:31:33,183 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-19 04:31:33,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:33,184 INFO L225 Difference]: With dead ends: 38 [2020-08-19 04:31:33,184 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 04:31:33,185 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=41, Invalid=265, Unknown=0, NotChecked=0, Total=306 [2020-08-19 04:31:33,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 04:31:33,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-19 04:31:33,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-19 04:31:33,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-19 04:31:33,189 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-19 04:31:33,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:33,190 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-19 04:31:33,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 04:31:33,190 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-19 04:31:33,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-19 04:31:33,191 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:33,191 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:33,191 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 04:31:33,191 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:33,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:33,192 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-19 04:31:33,192 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:33,192 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1705675821] [2020-08-19 04:31:33,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:33,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:33,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:33,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:33,687 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:33,688 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1705675821] [2020-08-19 04:31:33,688 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:33,688 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 04:31:33,688 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135053875] [2020-08-19 04:31:33,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 04:31:33,690 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:33,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 04:31:33,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-19 04:31:33,691 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-19 04:31:38,033 WARN L193 SmtUtils]: Spent 2.12 s on a formula simplification that was a NOOP. DAG size: 27 [2020-08-19 04:31:38,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:38,836 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-19 04:31:38,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 04:31:38,836 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-19 04:31:38,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:38,837 INFO L225 Difference]: With dead ends: 41 [2020-08-19 04:31:38,838 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 04:31:38,838 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=45, Invalid=335, Unknown=0, NotChecked=0, Total=380 [2020-08-19 04:31:38,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 04:31:38,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-19 04:31:38,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 04:31:38,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-19 04:31:38,843 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-19 04:31:38,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:38,843 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-19 04:31:38,843 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 04:31:38,843 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-19 04:31:38,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 04:31:38,844 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:38,844 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:38,845 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 04:31:38,845 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:38,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:38,845 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-19 04:31:38,845 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:38,846 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1635904272] [2020-08-19 04:31:38,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:38,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:39,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:39,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:39,370 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:39,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1635904272] [2020-08-19 04:31:39,371 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:39,371 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 04:31:39,371 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009975765] [2020-08-19 04:31:39,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 04:31:39,372 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:39,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 04:31:39,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-19 04:31:39,373 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-19 04:31:52,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:52,311 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-19 04:31:52,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 04:31:52,312 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-19 04:31:52,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:52,313 INFO L225 Difference]: With dead ends: 44 [2020-08-19 04:31:52,313 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 04:31:52,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=49, Invalid=412, Unknown=1, NotChecked=0, Total=462 [2020-08-19 04:31:52,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 04:31:52,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-19 04:31:52,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-19 04:31:52,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-19 04:31:52,318 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-19 04:31:52,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:52,319 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-19 04:31:52,319 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 04:31:52,319 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-19 04:31:52,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 04:31:52,320 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:52,320 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:52,321 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 04:31:52,321 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:52,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:52,321 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-19 04:31:52,321 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:52,322 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1573434854] [2020-08-19 04:31:52,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:52,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:53,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:53,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:53,018 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:53,018 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1573434854] [2020-08-19 04:31:53,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:53,019 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 04:31:53,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391088824] [2020-08-19 04:31:53,019 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 04:31:53,019 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:53,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 04:31:53,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-19 04:31:53,020 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-19 04:31:53,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:53,442 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-19 04:31:53,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 04:31:53,444 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-19 04:31:53,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:53,445 INFO L225 Difference]: With dead ends: 47 [2020-08-19 04:31:53,445 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 04:31:53,446 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=53, Invalid=499, Unknown=0, NotChecked=0, Total=552 [2020-08-19 04:31:53,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 04:31:53,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-19 04:31:53,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 04:31:53,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-19 04:31:53,451 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-19 04:31:53,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:53,451 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-19 04:31:53,451 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 04:31:53,451 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-19 04:31:53,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 04:31:53,452 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:53,452 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:53,453 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 04:31:53,453 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:53,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:53,453 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-19 04:31:53,453 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:53,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [607436126] [2020-08-19 04:31:53,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:53,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:54,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:54,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:54,153 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:54,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [607436126] [2020-08-19 04:31:54,154 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:54,154 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 04:31:54,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783971675] [2020-08-19 04:31:54,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 04:31:54,155 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:54,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 04:31:54,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-19 04:31:54,156 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-19 04:32:09,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:32:09,279 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-19 04:32:09,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 04:32:09,279 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-19 04:32:09,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:32:09,281 INFO L225 Difference]: With dead ends: 50 [2020-08-19 04:32:09,281 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 04:32:09,282 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=57, Invalid=589, Unknown=4, NotChecked=0, Total=650 [2020-08-19 04:32:09,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 04:32:09,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-19 04:32:09,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 04:32:09,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-19 04:32:09,287 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-19 04:32:09,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:32:09,288 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-19 04:32:09,288 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 04:32:09,288 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-19 04:32:09,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 04:32:09,289 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:32:09,289 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:32:09,289 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 04:32:09,290 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:32:09,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:32:09,290 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-19 04:32:09,290 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:32:09,291 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [628409041] [2020-08-19 04:32:09,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:32:09,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:32:10,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:32:10,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:32:10,224 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:32:10,225 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [628409041] [2020-08-19 04:32:10,225 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:32:10,225 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 04:32:10,226 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625327097] [2020-08-19 04:32:10,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 04:32:10,226 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:32:10,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 04:32:10,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-19 04:32:10,227 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states. [2020-08-19 04:32:29,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:32:29,618 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-19 04:32:29,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 04:32:29,618 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 43 [2020-08-19 04:32:29,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:32:29,619 INFO L225 Difference]: With dead ends: 53 [2020-08-19 04:32:29,619 INFO L226 Difference]: Without dead ends: 47 [2020-08-19 04:32:29,620 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=61, Invalid=691, Unknown=4, NotChecked=0, Total=756 [2020-08-19 04:32:29,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-19 04:32:29,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-19 04:32:29,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-19 04:32:29,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-19 04:32:29,624 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2020-08-19 04:32:29,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:32:29,625 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-19 04:32:29,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 04:32:29,625 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-19 04:32:29,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 04:32:29,626 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:32:29,626 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:32:29,626 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 04:32:29,626 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:32:29,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:32:29,629 INFO L82 PathProgramCache]: Analyzing trace with hash -1188694230, now seen corresponding path program 11 times [2020-08-19 04:32:29,629 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:32:29,629 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [997855500] [2020-08-19 04:32:29,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:32:29,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:32:30,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:32:30,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:32:30,624 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:32:30,625 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [997855500] [2020-08-19 04:32:30,625 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:32:30,625 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 04:32:30,625 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996923549] [2020-08-19 04:32:30,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 04:32:30,626 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:32:30,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 04:32:30,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-19 04:32:30,627 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 27 states.