/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=5000 --traceabstraction.additional.smt.options interpolation-heuristic=DEEPEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 20:41:56,952 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 20:41:56,955 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 20:41:56,980 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 20:41:56,981 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 20:41:56,990 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 20:41:56,991 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 20:41:56,994 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 20:41:56,996 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 20:41:56,997 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 20:41:56,998 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 20:41:57,001 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 20:41:57,001 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 20:41:57,003 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 20:41:57,004 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 20:41:57,007 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 20:41:57,009 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 20:41:57,011 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 20:41:57,013 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 20:41:57,019 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 20:41:57,023 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 20:41:57,024 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 20:41:57,025 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 20:41:57,026 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 20:41:57,037 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 20:41:57,048 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 20:41:57,049 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 20:41:57,051 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 20:41:57,052 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 [2020-08-21 20:41:57,095 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 20:41:57,095 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 20:41:57,097 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 20:41:57,097 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 20:41:57,097 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 20:41:57,097 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 20:41:57,098 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 20:41:57,098 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 20:41:57,098 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 20:41:57,098 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 20:41:57,098 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 20:41:57,098 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 20:41:57,099 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 20:41:57,099 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 20:41:57,099 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 20:41:57,099 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 20:41:57,099 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 20:41:57,100 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 20:41:57,100 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 20:41:57,100 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 20:41:57,100 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 20:41:57,100 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 20:41:57,101 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 20:41:57,101 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 20:41:57,101 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 20:41:57,101 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 20:41:57,101 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 20:41:57,102 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 20:41:57,102 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 20:41:57,102 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=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; [2020-08-21 20:41:57,394 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 20:41:57,414 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 20:41:57,420 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 20:41:57,422 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 20:41:57,423 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 20:41:57,424 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-21 20:41:57,493 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/37e58b3f6/9639f5c776b54e50ba7a42afcaaaa0d0/FLAG7125d4c92 [2020-08-21 20:41:57,951 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 20:41:57,951 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-21 20:41:57,958 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/37e58b3f6/9639f5c776b54e50ba7a42afcaaaa0d0/FLAG7125d4c92 [2020-08-21 20:41:58,335 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/37e58b3f6/9639f5c776b54e50ba7a42afcaaaa0d0 [2020-08-21 20:41:58,346 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 20:41:58,348 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 20:41:58,350 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 20:41:58,350 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 20:41:58,354 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 20:41:58,355 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:41:58" (1/1) ... [2020-08-21 20:41:58,358 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@23bccf0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:58, skipping insertion in model container [2020-08-21 20:41:58,359 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:41:58" (1/1) ... [2020-08-21 20:41:58,367 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 20:41:58,386 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 20:41:58,572 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:41:58,576 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 20:41:58,594 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:41:58,610 INFO L208 MainTranslator]: Completed translation [2020-08-21 20:41:58,610 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:58 WrapperNode [2020-08-21 20:41:58,610 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 20:41:58,611 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 20:41:58,611 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 20:41:58,611 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 20:41:58,625 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:58" (1/1) ... [2020-08-21 20:41:58,625 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:58" (1/1) ... [2020-08-21 20:41:58,709 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:58" (1/1) ... [2020-08-21 20:41:58,712 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:58" (1/1) ... [2020-08-21 20:41:58,717 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:58" (1/1) ... [2020-08-21 20:41:58,722 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:58" (1/1) ... [2020-08-21 20:41:58,723 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:58" (1/1) ... [2020-08-21 20:41:58,724 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 20:41:58,725 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 20:41:58,725 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 20:41:58,725 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 20:41:58,726 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:58" (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 [2020-08-21 20:41:58,782 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 20:41:58,782 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 20:41:58,782 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 20:41:58,782 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 20:41:58,782 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 20:41:58,782 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 20:41:58,783 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 20:41:58,783 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 20:41:58,783 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 20:41:58,783 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 20:41:58,783 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 20:41:58,783 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 20:41:58,784 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 20:41:58,988 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 20:41:58,989 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 20:41:58,993 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:41:58 BoogieIcfgContainer [2020-08-21 20:41:58,993 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 20:41:58,994 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 20:41:58,995 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 20:41:58,998 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 20:41:58,998 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 08:41:58" (1/3) ... [2020-08-21 20:41:58,999 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@911e4b5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:41:58, skipping insertion in model container [2020-08-21 20:41:58,999 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:58" (2/3) ... [2020-08-21 20:41:59,000 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@911e4b5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:41:58, skipping insertion in model container [2020-08-21 20:41:59,000 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:41:58" (3/3) ... [2020-08-21 20:41:59,001 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-21 20:41:59,015 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 20:41:59,022 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 20:41:59,038 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 20:41:59,072 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 20:41:59,072 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 20:41:59,073 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 20:41:59,073 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 20:41:59,073 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 20:41:59,073 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 20:41:59,073 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 20:41:59,073 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 20:41:59,098 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-21 20:41:59,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 20:41:59,105 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:59,106 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:59,106 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:59,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:59,113 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-21 20:41:59,125 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:59,125 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [19444859] [2020-08-21 20:41:59,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:59,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:59,256 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:59,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:59,262 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:59,263 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [19444859] [2020-08-21 20:41:59,265 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:41:59,265 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-21 20:41:59,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88749374] [2020-08-21 20:41:59,271 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-21 20:41:59,272 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:59,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-21 20:41:59,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 20:41:59,289 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-21 20:41:59,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:59,314 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-21 20:41:59,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-21 20:41:59,316 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-21 20:41:59,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:59,326 INFO L225 Difference]: With dead ends: 35 [2020-08-21 20:41:59,326 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 20:41:59,330 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 [2020-08-21 20:41:59,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 20:41:59,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 20:41:59,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 20:41:59,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-21 20:41:59,370 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-21 20:41:59,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:59,371 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-21 20:41:59,371 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-21 20:41:59,372 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-21 20:41:59,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 20:41:59,372 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:59,372 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:59,373 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 20:41:59,373 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:59,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:59,374 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-21 20:41:59,374 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:59,375 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [451852539] [2020-08-21 20:41:59,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:59,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:59,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:59,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:59,427 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:59,427 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [451852539] [2020-08-21 20:41:59,428 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:41:59,428 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 20:41:59,428 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610527559] [2020-08-21 20:41:59,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 20:41:59,430 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:59,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 20:41:59,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 20:41:59,432 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-21 20:41:59,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:59,451 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-21 20:41:59,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 20:41:59,452 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-21 20:41:59,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:59,454 INFO L225 Difference]: With dead ends: 24 [2020-08-21 20:41:59,454 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 20:41:59,455 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 [2020-08-21 20:41:59,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 20:41:59,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 20:41:59,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 20:41:59,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-21 20:41:59,459 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-21 20:41:59,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:59,460 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-21 20:41:59,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 20:41:59,460 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-21 20:41:59,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 20:41:59,461 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:59,461 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:59,462 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 20:41:59,462 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:59,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:59,462 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-21 20:41:59,463 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:59,463 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1694057409] [2020-08-21 20:41:59,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:59,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:59,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:59,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:59,731 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:59,734 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1694057409] [2020-08-21 20:41:59,734 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:41:59,734 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 20:41:59,735 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599075518] [2020-08-21 20:41:59,735 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 20:41:59,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:59,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 20:41:59,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:41:59,737 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-21 20:41:59,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:59,797 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-21 20:41:59,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 20:41:59,798 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 20:41:59,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:59,799 INFO L225 Difference]: With dead ends: 23 [2020-08-21 20:41:59,799 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 20:41:59,800 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:41:59,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 20:41:59,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 20:41:59,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 20:41:59,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-21 20:41:59,805 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-21 20:41:59,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:59,805 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-21 20:41:59,805 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 20:41:59,806 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-21 20:41:59,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 20:41:59,807 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:59,807 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:59,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 20:41:59,807 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:59,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:59,808 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-21 20:41:59,808 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:59,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1231849985] [2020-08-21 20:41:59,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:59,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:00,058 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 15 [2020-08-21 20:42:00,060 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:00,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:00,069 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:00,069 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1231849985] [2020-08-21 20:42:00,069 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:42:00,070 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 20:42:00,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118705814] [2020-08-21 20:42:00,075 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 20:42:00,076 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:00,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 20:42:00,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 20:42:00,076 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-21 20:42:00,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:00,106 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-21 20:42:00,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 20:42:00,107 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-21 20:42:00,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:00,108 INFO L225 Difference]: With dead ends: 26 [2020-08-21 20:42:00,108 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 20:42:00,110 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 [2020-08-21 20:42:00,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 20:42:00,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 20:42:00,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 20:42:00,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 20:42:00,118 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-21 20:42:00,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:00,119 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 20:42:00,119 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 20:42:00,119 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 20:42:00,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 20:42:00,121 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:00,122 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:00,123 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 20:42:00,123 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:00,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:00,123 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-21 20:42:00,124 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:00,124 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [784349323] [2020-08-21 20:42:00,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:00,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:00,338 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:00,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:00,342 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:00,343 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [784349323] [2020-08-21 20:42:00,343 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:00,343 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 20:42:00,344 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646781352] [2020-08-21 20:42:00,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 20:42:00,345 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:00,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 20:42:00,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 20:42:00,346 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-21 20:42:00,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:00,466 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 20:42:00,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 20:42:00,467 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-21 20:42:00,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:00,468 INFO L225 Difference]: With dead ends: 26 [2020-08-21 20:42:00,468 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 20:42:00,469 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:42:00,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 20:42:00,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 20:42:00,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 20:42:00,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-21 20:42:00,473 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-21 20:42:00,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:00,474 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-21 20:42:00,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 20:42:00,474 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-21 20:42:00,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 20:42:00,475 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:00,475 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:00,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 20:42:00,476 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:00,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:00,476 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-21 20:42:00,476 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:00,477 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1345557069] [2020-08-21 20:42:00,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:00,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:00,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:00,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:00,760 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:00,761 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1345557069] [2020-08-21 20:42:00,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:00,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 20:42:00,762 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588895301] [2020-08-21 20:42:00,763 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 20:42:00,763 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:00,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 20:42:00,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:42:00,764 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-21 20:42:00,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:00,913 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 20:42:00,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 20:42:00,914 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-21 20:42:00,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:00,916 INFO L225 Difference]: With dead ends: 29 [2020-08-21 20:42:00,916 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 20:42:00,917 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:42:00,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 20:42:00,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 20:42:00,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 20:42:00,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 20:42:00,922 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-21 20:42:00,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:00,923 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 20:42:00,923 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 20:42:00,923 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 20:42:00,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 20:42:00,924 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:00,924 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:00,924 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 20:42:00,925 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:00,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:00,925 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-21 20:42:00,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:00,926 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1122199705] [2020-08-21 20:42:00,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:00,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:01,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:01,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:01,227 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:01,227 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1122199705] [2020-08-21 20:42:01,228 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:01,228 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 20:42:01,228 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628896206] [2020-08-21 20:42:01,229 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 20:42:01,229 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:01,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 20:42:01,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:42:01,230 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-21 20:42:09,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:09,782 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 20:42:09,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 20:42:09,783 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-21 20:42:09,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:09,784 INFO L225 Difference]: With dead ends: 32 [2020-08-21 20:42:09,784 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 20:42:09,785 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=33, Invalid=147, Unknown=2, NotChecked=0, Total=182 [2020-08-21 20:42:09,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 20:42:09,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 20:42:09,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 20:42:09,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-21 20:42:09,797 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-21 20:42:09,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:09,797 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-21 20:42:09,798 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 20:42:09,798 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-21 20:42:09,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 20:42:09,799 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:09,799 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:09,799 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 20:42:09,800 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:09,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:09,801 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-21 20:42:09,802 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:09,802 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1134934526] [2020-08-21 20:42:09,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:09,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:10,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:10,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:10,194 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:10,194 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1134934526] [2020-08-21 20:42:10,194 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:10,195 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 20:42:10,195 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460318845] [2020-08-21 20:42:10,195 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 20:42:10,196 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:10,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 20:42:10,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:42:10,196 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-21 20:42:10,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:10,476 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-21 20:42:10,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 20:42:10,477 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-21 20:42:10,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:10,478 INFO L225 Difference]: With dead ends: 35 [2020-08-21 20:42:10,478 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 20:42:10,479 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 [2020-08-21 20:42:10,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 20:42:10,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 20:42:10,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 20:42:10,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 20:42:10,484 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-21 20:42:10,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:10,484 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 20:42:10,484 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 20:42:10,484 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 20:42:10,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 20:42:10,485 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:10,485 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:10,486 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 20:42:10,486 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:10,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:10,486 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-21 20:42:10,487 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:10,487 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1284219918] [2020-08-21 20:42:10,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:10,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:10,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:10,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:10,889 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:10,889 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1284219918] [2020-08-21 20:42:10,892 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:10,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 20:42:10,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417048328] [2020-08-21 20:42:10,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 20:42:10,894 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:10,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 20:42:10,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-21 20:42:10,895 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-21 20:42:19,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:19,560 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 20:42:19,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 20:42:19,561 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-21 20:42:19,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:19,561 INFO L225 Difference]: With dead ends: 38 [2020-08-21 20:42:19,562 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 20:42:19,562 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=41, Invalid=263, Unknown=2, NotChecked=0, Total=306 [2020-08-21 20:42:19,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 20:42:19,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-21 20:42:19,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 20:42:19,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-21 20:42:19,574 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-21 20:42:19,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:19,574 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-21 20:42:19,574 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 20:42:19,575 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-21 20:42:19,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 20:42:19,576 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:19,576 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:19,576 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 20:42:19,576 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:19,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:19,577 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-21 20:42:19,577 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:19,577 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [321827639] [2020-08-21 20:42:19,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:19,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:20,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:20,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:20,164 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:20,166 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [321827639] [2020-08-21 20:42:20,166 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:20,166 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 20:42:20,167 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120502507] [2020-08-21 20:42:20,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 20:42:20,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:20,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 20:42:20,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-21 20:42:20,171 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-21 20:42:26,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:26,841 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-21 20:42:26,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 20:42:26,842 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-21 20:42:26,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:26,842 INFO L225 Difference]: With dead ends: 41 [2020-08-21 20:42:26,843 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 20:42:26,843 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=45, Invalid=334, Unknown=1, NotChecked=0, Total=380 [2020-08-21 20:42:26,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 20:42:26,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 20:42:26,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 20:42:26,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 20:42:26,849 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-21 20:42:26,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:26,849 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 20:42:26,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 20:42:26,849 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 20:42:26,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 20:42:26,850 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:26,850 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:26,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 20:42:26,851 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:26,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:26,851 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-21 20:42:26,851 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:26,852 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [570929410] [2020-08-21 20:42:26,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:26,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:27,431 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:27,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:27,437 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:27,437 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [570929410] [2020-08-21 20:42:27,437 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:27,438 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 20:42:27,438 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1624718795] [2020-08-21 20:42:27,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 20:42:27,438 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:27,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 20:42:27,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-21 20:42:27,439 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-21 20:42:34,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:34,086 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 20:42:34,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 20:42:34,086 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-21 20:42:34,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:34,087 INFO L225 Difference]: With dead ends: 44 [2020-08-21 20:42:34,087 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 20:42:34,088 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=49, Invalid=412, Unknown=1, NotChecked=0, Total=462 [2020-08-21 20:42:34,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 20:42:34,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 20:42:34,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 20:42:34,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 20:42:34,097 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-21 20:42:34,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:34,098 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 20:42:34,098 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 20:42:34,098 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 20:42:34,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 20:42:34,099 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:34,099 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:34,099 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 20:42:34,103 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:34,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:34,103 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-21 20:42:34,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:34,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [245705043] [2020-08-21 20:42:34,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:34,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:34,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:34,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:34,758 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:34,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [245705043] [2020-08-21 20:42:34,760 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:34,760 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 20:42:34,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581747703] [2020-08-21 20:42:34,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 20:42:34,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:34,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 20:42:34,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-21 20:42:34,763 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-21 20:42:35,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:35,204 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-21 20:42:35,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 20:42:35,205 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-21 20:42:35,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:35,206 INFO L225 Difference]: With dead ends: 47 [2020-08-21 20:42:35,206 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 20:42:35,207 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 [2020-08-21 20:42:35,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 20:42:35,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 20:42:35,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 20:42:35,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 20:42:35,212 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-21 20:42:35,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:35,212 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 20:42:35,212 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 20:42:35,213 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 20:42:35,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 20:42:35,213 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:35,214 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:35,214 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 20:42:35,214 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:35,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:35,214 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-21 20:42:35,215 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:35,215 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [889591063] [2020-08-21 20:42:35,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:35,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:35,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:35,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:35,964 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:35,965 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [889591063] [2020-08-21 20:42:35,965 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:35,965 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 20:42:35,965 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355580895] [2020-08-21 20:42:35,966 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 20:42:35,966 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:35,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 20:42:35,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-21 20:42:35,967 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-21 20:42:53,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:53,145 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 20:42:53,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 20:42:53,145 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-21 20:42:53,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:53,146 INFO L225 Difference]: With dead ends: 50 [2020-08-21 20:42:53,146 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 20:42:53,147 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=57, Invalid=590, Unknown=3, NotChecked=0, Total=650 [2020-08-21 20:42:53,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 20:42:53,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 20:42:53,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 20:42:53,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-21 20:42:53,152 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-21 20:42:53,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:53,152 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-21 20:42:53,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 20:42:53,153 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-21 20:42:53,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 20:42:53,153 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:53,154 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:53,154 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 20:42:53,154 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:53,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:53,154 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-21 20:42:53,155 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:53,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1292532967] [2020-08-21 20:42:53,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:53,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:54,050 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:54,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:54,068 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:54,071 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1292532967] [2020-08-21 20:42:54,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:54,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 20:42:54,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861889336] [2020-08-21 20:42:54,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 20:42:54,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:54,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 20:42:54,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-21 20:42:54,073 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states. [2020-08-21 20:43:11,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:43:11,501 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-21 20:43:11,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 20:43:11,502 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 43 [2020-08-21 20:43:11,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:43:11,503 INFO L225 Difference]: With dead ends: 53 [2020-08-21 20:43:11,503 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 20:43:11,504 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=61, Invalid=690, Unknown=5, NotChecked=0, Total=756 [2020-08-21 20:43:11,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 20:43:11,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 20:43:11,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 20:43:11,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-21 20:43:11,514 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2020-08-21 20:43:11,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:43:11,514 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-21 20:43:11,514 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 20:43:11,514 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-21 20:43:11,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 20:43:11,515 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:43:11,515 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:43:11,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 20:43:11,516 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:43:11,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:43:11,516 INFO L82 PathProgramCache]: Analyzing trace with hash -1188694230, now seen corresponding path program 11 times [2020-08-21 20:43:11,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:43:11,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1283803299] [2020-08-21 20:43:11,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:43:11,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:43:12,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:43:12,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:43:12,498 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:43:12,498 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1283803299] [2020-08-21 20:43:12,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:43:12,499 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 20:43:12,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231098180] [2020-08-21 20:43:12,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 20:43:12,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:43:12,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 20:43:12,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-21 20:43:12,500 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 27 states.