/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=0.3 -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 05:19:45,278 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 05:19:45,281 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 05:19:45,307 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 05:19:45,307 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 05:19:45,308 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 05:19:45,309 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 05:19:45,311 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 05:19:45,312 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 05:19:45,313 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 05:19:45,314 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 05:19:45,315 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 05:19:45,315 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 05:19:45,316 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 05:19:45,317 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 05:19:45,318 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 05:19:45,319 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 05:19:45,320 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 05:19:45,321 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 05:19:45,323 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 05:19:45,324 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 05:19:45,325 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 05:19:45,327 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 05:19:45,327 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 05:19:45,330 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 05:19:45,336 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 05:19:45,337 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 05:19:45,338 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 05:19:45,338 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 05:19:45,361 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 05:19:45,361 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 05:19:45,362 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 05:19:45,362 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 05:19:45,363 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 05:19:45,363 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 05:19:45,363 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 05:19:45,363 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 05:19:45,363 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 05:19:45,364 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 05:19:45,364 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 05:19:45,364 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 05:19:45,364 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 05:19:45,364 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 05:19:45,364 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 05:19:45,365 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 05:19:45,365 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 05:19:45,365 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 05:19:45,365 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 05:19:45,365 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 05:19:45,365 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 05:19:45,366 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 05:19:45,366 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 05:19:45,366 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 05:19:45,366 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 05:19:45,366 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 05:19:45,367 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 05:19:45,367 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 05:19:45,367 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 05:19:45,367 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=0.3; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3; [2020-08-19 05:19:45,672 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 05:19:45,687 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 05:19:45,693 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 05:19:45,695 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 05:19:45,698 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 05:19:45,698 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-19 05:19:45,772 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e233ea94f/dba36bfda188403ea162f03c581b323a/FLAG0361095d3 [2020-08-19 05:19:46,211 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 05:19:46,211 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-19 05:19:46,218 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e233ea94f/dba36bfda188403ea162f03c581b323a/FLAG0361095d3 [2020-08-19 05:19:46,648 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e233ea94f/dba36bfda188403ea162f03c581b323a [2020-08-19 05:19:46,656 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 05:19:46,657 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 05:19:46,658 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 05:19:46,658 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 05:19:46,661 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 05:19:46,662 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 05:19:46" (1/1) ... [2020-08-19 05:19:46,665 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1617b53b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:46, skipping insertion in model container [2020-08-19 05:19:46,665 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 05:19:46" (1/1) ... [2020-08-19 05:19:46,673 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 05:19:46,691 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 05:19:46,851 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 05:19:46,855 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 05:19:46,872 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 05:19:46,884 INFO L208 MainTranslator]: Completed translation [2020-08-19 05:19:46,884 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:46 WrapperNode [2020-08-19 05:19:46,884 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 05:19:46,885 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 05:19:46,885 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 05:19:46,885 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 05:19:46,896 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:46" (1/1) ... [2020-08-19 05:19:46,896 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:46" (1/1) ... [2020-08-19 05:19:46,977 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:46" (1/1) ... [2020-08-19 05:19:46,977 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:46" (1/1) ... [2020-08-19 05:19:46,982 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:46" (1/1) ... [2020-08-19 05:19:46,986 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:46" (1/1) ... [2020-08-19 05:19:46,987 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:46" (1/1) ... [2020-08-19 05:19:46,989 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 05:19:46,989 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 05:19:46,989 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 05:19:46,990 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 05:19:46,990 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:46" (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 05:19:47,045 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 05:19:47,045 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 05:19:47,045 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-19 05:19:47,045 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 05:19:47,045 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 05:19:47,045 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 05:19:47,046 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-19 05:19:47,046 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-19 05:19:47,046 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 05:19:47,046 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-19 05:19:47,046 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 05:19:47,046 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 05:19:47,047 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 05:19:47,286 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 05:19:47,287 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-19 05:19:47,292 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 05:19:47 BoogieIcfgContainer [2020-08-19 05:19:47,292 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 05:19:47,293 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 05:19:47,294 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 05:19:47,297 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 05:19:47,297 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 05:19:46" (1/3) ... [2020-08-19 05:19:47,298 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@124677f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 05:19:47, skipping insertion in model container [2020-08-19 05:19:47,298 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:46" (2/3) ... [2020-08-19 05:19:47,298 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@124677f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 05:19:47, skipping insertion in model container [2020-08-19 05:19:47,298 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 05:19:47" (3/3) ... [2020-08-19 05:19:47,300 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-19 05:19:47,311 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 05:19:47,319 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 05:19:47,336 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 05:19:47,360 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 05:19:47,360 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 05:19:47,361 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 05:19:47,361 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 05:19:47,361 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 05:19:47,361 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 05:19:47,361 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 05:19:47,362 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 05:19:47,397 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-19 05:19:47,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 05:19:47,404 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:47,405 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:47,405 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:47,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:47,412 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-19 05:19:47,425 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:47,426 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [757100046] [2020-08-19 05:19:47,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:47,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:47,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:47,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:47,532 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 05:19:47,533 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [757100046] [2020-08-19 05:19:47,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 05:19:47,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-19 05:19:47,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047405836] [2020-08-19 05:19:47,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-19 05:19:47,541 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:47,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-19 05:19:47,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-19 05:19:47,558 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-19 05:19:47,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:47,580 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-19 05:19:47,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-19 05:19:47,582 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-19 05:19:47,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:47,591 INFO L225 Difference]: With dead ends: 35 [2020-08-19 05:19:47,592 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 05:19:47,595 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 05:19:47,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 05:19:47,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 05:19:47,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 05:19:47,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-19 05:19:47,633 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-19 05:19:47,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:47,633 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-19 05:19:47,633 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-19 05:19:47,634 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-19 05:19:47,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 05:19:47,634 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:47,634 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:47,635 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 05:19:47,635 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:47,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:47,635 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-19 05:19:47,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:47,636 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [870443629] [2020-08-19 05:19:47,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:47,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:47,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:47,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:47,685 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 05:19:47,685 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [870443629] [2020-08-19 05:19:47,686 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 05:19:47,686 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 05:19:47,686 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [832674203] [2020-08-19 05:19:47,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 05:19:47,688 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:47,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 05:19:47,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 05:19:47,689 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-19 05:19:47,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:47,707 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-19 05:19:47,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 05:19:47,707 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-19 05:19:47,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:47,709 INFO L225 Difference]: With dead ends: 24 [2020-08-19 05:19:47,709 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 05:19:47,710 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 05:19:47,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 05:19:47,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 05:19:47,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 05:19:47,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-19 05:19:47,714 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-19 05:19:47,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:47,716 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-19 05:19:47,716 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 05:19:47,716 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-19 05:19:47,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 05:19:47,717 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:47,717 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:47,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 05:19:47,718 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:47,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:47,718 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-19 05:19:47,718 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:47,719 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [220856290] [2020-08-19 05:19:47,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:47,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:48,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:48,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:48,011 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 05:19:48,011 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [220856290] [2020-08-19 05:19:48,012 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 05:19:48,012 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 05:19:48,013 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860075754] [2020-08-19 05:19:48,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 05:19:48,014 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:48,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 05:19:48,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 05:19:48,015 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-19 05:19:48,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:48,052 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-19 05:19:48,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 05:19:48,053 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-19 05:19:48,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:48,054 INFO L225 Difference]: With dead ends: 23 [2020-08-19 05:19:48,054 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 05:19:48,055 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 [2020-08-19 05:19:48,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 05:19:48,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 05:19:48,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 05:19:48,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-19 05:19:48,060 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-19 05:19:48,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:48,060 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-19 05:19:48,061 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 05:19:48,061 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-19 05:19:48,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 05:19:48,062 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:48,062 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:48,062 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 05:19:48,062 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:48,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:48,063 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-19 05:19:48,063 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:48,064 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1810030085] [2020-08-19 05:19:48,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:48,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:48,258 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:48,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:48,261 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 05:19:48,261 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1810030085] [2020-08-19 05:19:48,262 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 05:19:48,262 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 05:19:48,262 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1410805732] [2020-08-19 05:19:48,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 05:19:48,263 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:48,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 05:19:48,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 05:19:48,264 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-19 05:19:48,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:48,283 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-19 05:19:48,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 05:19:48,284 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-19 05:19:48,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:48,285 INFO L225 Difference]: With dead ends: 26 [2020-08-19 05:19:48,285 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 05:19:48,286 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 05:19:48,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 05:19:48,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 05:19:48,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 05:19:48,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-19 05:19:48,290 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-19 05:19:48,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:48,291 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-19 05:19:48,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 05:19:48,291 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-19 05:19:48,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 05:19:48,292 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:48,292 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:48,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 05:19:48,292 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:48,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:48,293 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-19 05:19:48,293 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:48,293 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [280247557] [2020-08-19 05:19:48,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:48,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:48,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:48,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:48,481 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 05:19:48,482 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [280247557] [2020-08-19 05:19:48,482 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:48,482 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 05:19:48,482 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502536503] [2020-08-19 05:19:48,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 05:19:48,483 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:48,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 05:19:48,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-19 05:19:48,484 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-19 05:19:48,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:48,593 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-19 05:19:48,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 05:19:48,594 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-19 05:19:48,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:48,595 INFO L225 Difference]: With dead ends: 26 [2020-08-19 05:19:48,595 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 05:19:48,596 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 [2020-08-19 05:19:48,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 05:19:48,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-19 05:19:48,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 05:19:48,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-19 05:19:48,600 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-19 05:19:48,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:48,602 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-19 05:19:48,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 05:19:48,602 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-19 05:19:48,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 05:19:48,603 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:48,603 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:48,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 05:19:48,604 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:48,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:48,604 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-19 05:19:48,605 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:48,605 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [519266518] [2020-08-19 05:19:48,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:48,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:48,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:48,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:48,867 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 05:19:48,867 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [519266518] [2020-08-19 05:19:48,867 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:48,868 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 05:19:48,868 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809036365] [2020-08-19 05:19:48,868 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 05:19:48,869 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:48,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 05:19:48,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-19 05:19:48,870 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-19 05:19:49,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:49,018 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-19 05:19:49,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 05:19:49,019 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-19 05:19:49,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:49,020 INFO L225 Difference]: With dead ends: 29 [2020-08-19 05:19:49,020 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 05:19:49,021 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 [2020-08-19 05:19:49,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 05:19:49,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-19 05:19:49,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-19 05:19:49,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-19 05:19:49,025 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-19 05:19:49,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:49,026 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-19 05:19:49,026 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 05:19:49,026 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-19 05:19:49,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 05:19:49,027 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:49,027 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:49,027 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 05:19:49,027 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:49,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:49,028 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-19 05:19:49,028 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:49,028 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [622718646] [2020-08-19 05:19:49,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:49,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:49,282 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:49,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:49,286 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 05:19:49,287 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [622718646] [2020-08-19 05:19:49,287 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:49,287 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 05:19:49,287 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958848806] [2020-08-19 05:19:49,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 05:19:49,288 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:49,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 05:19:49,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-19 05:19:49,289 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-19 05:19:55,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:55,715 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-19 05:19:55,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 05:19:55,716 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-19 05:19:55,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:55,717 INFO L225 Difference]: With dead ends: 32 [2020-08-19 05:19:55,717 INFO L226 Difference]: Without dead ends: 26 [2020-08-19 05:19:55,717 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 [2020-08-19 05:19:55,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-19 05:19:55,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-19 05:19:55,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-19 05:19:55,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-19 05:19:55,722 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-19 05:19:55,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:55,723 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-19 05:19:55,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 05:19:55,723 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-19 05:19:55,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-19 05:19:55,724 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:55,724 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:55,725 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 05:19:55,725 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:55,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:55,725 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-19 05:19:55,726 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:55,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2055102705] [2020-08-19 05:19:55,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:55,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:56,046 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:56,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:56,052 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 05:19:56,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2055102705] [2020-08-19 05:19:56,052 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:56,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 05:19:56,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [475685975] [2020-08-19 05:19:56,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 05:19:56,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:56,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 05:19:56,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-19 05:19:56,054 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-19 05:19:56,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:56,284 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-19 05:19:56,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 05:19:56,285 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-19 05:19:56,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:56,285 INFO L225 Difference]: With dead ends: 35 [2020-08-19 05:19:56,287 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 05:19:56,288 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 05:19:56,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 05:19:56,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-19 05:19:56,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 05:19:56,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-19 05:19:56,296 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-19 05:19:56,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:56,296 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-19 05:19:56,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 05:19:56,296 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-19 05:19:56,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 05:19:56,300 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:56,300 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:56,300 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 05:19:56,300 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:56,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:56,301 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-19 05:19:56,301 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:56,302 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [548894196] [2020-08-19 05:19:56,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:56,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:56,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:56,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:56,693 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 05:19:56,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [548894196] [2020-08-19 05:19:56,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:56,693 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 05:19:56,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928569446] [2020-08-19 05:19:56,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 05:19:56,694 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:56,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 05:19:56,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-19 05:19:56,695 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-19 05:20:03,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:20:03,281 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-19 05:20:03,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 05:20:03,281 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-19 05:20:03,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:20:03,282 INFO L225 Difference]: With dead ends: 38 [2020-08-19 05:20:03,282 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 05:20:03,283 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 [2020-08-19 05:20:03,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 05:20:03,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-19 05:20:03,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-19 05:20:03,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-19 05:20:03,288 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-19 05:20:03,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:20:03,288 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-19 05:20:03,288 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 05:20:03,288 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-19 05:20:03,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-19 05:20:03,289 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:20:03,289 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:20:03,290 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 05:20:03,290 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:20:03,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:20:03,290 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-19 05:20:03,291 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:20:03,291 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [976132724] [2020-08-19 05:20:03,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:20:03,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:03,749 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:20:03,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:03,756 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 05:20:03,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [976132724] [2020-08-19 05:20:03,757 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:20:03,757 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 05:20:03,758 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381597730] [2020-08-19 05:20:03,758 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 05:20:03,758 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:20:03,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 05:20:03,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-19 05:20:03,759 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-19 05:20:16,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:20:16,623 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-19 05:20:16,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 05:20:16,625 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-19 05:20:16,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:20:16,626 INFO L225 Difference]: With dead ends: 41 [2020-08-19 05:20:16,626 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 05:20:16,627 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=45, Invalid=333, Unknown=2, NotChecked=0, Total=380 [2020-08-19 05:20:16,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 05:20:16,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-19 05:20:16,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 05:20:16,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-19 05:20:16,631 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-19 05:20:16,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:20:16,632 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-19 05:20:16,632 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 05:20:16,632 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-19 05:20:16,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 05:20:16,633 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:20:16,633 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:20:16,633 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 05:20:16,633 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:20:16,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:20:16,634 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-19 05:20:16,634 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:20:16,634 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [950823250] [2020-08-19 05:20:16,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:20:16,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:17,173 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:20:17,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:17,183 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 05:20:17,184 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [950823250] [2020-08-19 05:20:17,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:20:17,184 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 05:20:17,184 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582086206] [2020-08-19 05:20:17,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 05:20:17,185 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:20:17,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 05:20:17,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-19 05:20:17,186 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-19 05:20:23,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:20:23,791 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-19 05:20:23,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 05:20:23,792 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-19 05:20:23,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:20:23,792 INFO L225 Difference]: With dead ends: 44 [2020-08-19 05:20:23,793 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 05:20:23,793 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 [2020-08-19 05:20:23,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 05:20:23,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-19 05:20:23,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-19 05:20:23,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-19 05:20:23,805 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-19 05:20:23,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:20:23,805 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-19 05:20:23,805 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 05:20:23,806 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-19 05:20:23,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 05:20:23,807 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:20:23,809 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:20:23,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 05:20:23,809 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:20:23,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:20:23,809 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-19 05:20:23,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:20:23,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [471774065] [2020-08-19 05:20:23,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:20:23,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:24,438 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:20:24,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:24,444 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 05:20:24,445 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [471774065] [2020-08-19 05:20:24,445 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:20:24,445 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 05:20:24,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024912438] [2020-08-19 05:20:24,446 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 05:20:24,446 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:20:24,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 05:20:24,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-19 05:20:24,447 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-19 05:20:24,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:20:24,874 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-19 05:20:24,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 05:20:24,875 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-19 05:20:24,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:20:24,876 INFO L225 Difference]: With dead ends: 47 [2020-08-19 05:20:24,876 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 05:20:24,877 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 05:20:24,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 05:20:24,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-19 05:20:24,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 05:20:24,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-19 05:20:24,881 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-19 05:20:24,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:20:24,882 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-19 05:20:24,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 05:20:24,882 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-19 05:20:24,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 05:20:24,883 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:20:24,883 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:20:24,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 05:20:24,883 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:20:24,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:20:24,884 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-19 05:20:24,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:20:24,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1757975098] [2020-08-19 05:20:24,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:20:24,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:25,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:20:25,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:25,584 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 05:20:25,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1757975098] [2020-08-19 05:20:25,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:20:25,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 05:20:25,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708415040] [2020-08-19 05:20:25,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 05:20:25,586 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:20:25,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 05:20:25,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-19 05:20:25,587 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-19 05:20:44,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:20:44,865 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-19 05:20:44,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 05:20:44,865 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-19 05:20:44,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:20:44,866 INFO L225 Difference]: With dead ends: 50 [2020-08-19 05:20:44,866 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 05:20:44,867 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 05:20:44,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 05:20:44,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-19 05:20:44,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 05:20:44,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-19 05:20:44,873 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-19 05:20:44,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:20:44,873 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-19 05:20:44,874 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 05:20:44,874 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-19 05:20:44,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 05:20:44,880 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:20:44,880 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:20:44,880 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 05:20:44,880 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:20:44,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:20:44,883 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-19 05:20:44,883 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:20:44,883 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [566796084] [2020-08-19 05:20:44,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:20:44,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:45,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:20:45,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:45,841 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 05:20:45,842 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [566796084] [2020-08-19 05:20:45,842 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:20:45,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 05:20:45,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444582545] [2020-08-19 05:20:45,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 05:20:45,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:20:45,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 05:20:45,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-19 05:20:45,844 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states.