/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 log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/afnp2014.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 14:15:13,194 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 14:15:13,198 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 14:15:13,243 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 14:15:13,244 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 14:15:13,245 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 14:15:13,246 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 14:15:13,248 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 14:15:13,250 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 14:15:13,250 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 14:15:13,251 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 14:15:13,253 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 14:15:13,253 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 14:15:13,254 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 14:15:13,255 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 14:15:13,256 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 14:15:13,257 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 14:15:13,258 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 14:15:13,260 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 14:15:13,262 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 14:15:13,264 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 14:15:13,265 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 14:15:13,266 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 14:15:13,267 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 14:15:13,270 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 14:15:13,278 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 14:15:13,279 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 14:15:13,279 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 14:15:13,280 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 14:15:13,303 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 14:15:13,304 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 14:15:13,305 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 14:15:13,305 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 14:15:13,305 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 14:15:13,306 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 14:15:13,306 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 14:15:13,306 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 14:15:13,306 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 14:15:13,306 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 14:15:13,307 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 14:15:13,307 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 14:15:13,307 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 14:15:13,307 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 14:15:13,307 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 14:15:13,307 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 14:15:13,308 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 14:15:13,308 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 14:15:13,308 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 14:15:13,308 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 14:15:13,308 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 14:15:13,309 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 14:15:13,309 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 14:15:13,309 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 14:15:13,309 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 14:15:13,310 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 14:15:13,310 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 14:15:13,310 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 14:15:13,310 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 14:15:13,310 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 -> log-additional-information=true; [2020-08-21 14:15:13,614 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 14:15:13,626 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 14:15:13,630 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 14:15:13,631 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 14:15:13,632 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 14:15:13,633 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-21 14:15:13,695 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/3b4dbf25e/5e249f077a3943a69818ea089d0508c5/FLAGcb952ae5d [2020-08-21 14:15:14,172 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 14:15:14,173 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-21 14:15:14,180 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/3b4dbf25e/5e249f077a3943a69818ea089d0508c5/FLAGcb952ae5d [2020-08-21 14:15:14,575 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/3b4dbf25e/5e249f077a3943a69818ea089d0508c5 [2020-08-21 14:15:14,585 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 14:15:14,586 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 14:15:14,587 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 14:15:14,588 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 14:15:14,591 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 14:15:14,592 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:15:14" (1/1) ... [2020-08-21 14:15:14,595 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2c1b6baf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:15:14, skipping insertion in model container [2020-08-21 14:15:14,596 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:15:14" (1/1) ... [2020-08-21 14:15:14,604 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 14:15:14,621 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 14:15:14,803 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:15:14,808 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 14:15:14,823 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:15:14,839 INFO L208 MainTranslator]: Completed translation [2020-08-21 14:15:14,839 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:15:14 WrapperNode [2020-08-21 14:15:14,840 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 14:15:14,840 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 14:15:14,841 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 14:15:14,841 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 14:15:14,855 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:15:14" (1/1) ... [2020-08-21 14:15:14,855 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:15:14" (1/1) ... [2020-08-21 14:15:14,952 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:15:14" (1/1) ... [2020-08-21 14:15:14,952 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:15:14" (1/1) ... [2020-08-21 14:15:14,956 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:15:14" (1/1) ... [2020-08-21 14:15:14,960 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:15:14" (1/1) ... [2020-08-21 14:15:14,961 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:15:14" (1/1) ... [2020-08-21 14:15:14,963 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 14:15:14,963 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 14:15:14,963 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 14:15:14,963 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 14:15:14,964 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:15:14" (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 14:15:15,029 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 14:15:15,029 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 14:15:15,029 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 14:15:15,029 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 14:15:15,029 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 14:15:15,030 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 14:15:15,030 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 14:15:15,030 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 14:15:15,030 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 14:15:15,030 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 14:15:15,030 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 14:15:15,031 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 14:15:15,031 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 14:15:15,219 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 14:15:15,220 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 14:15:15,224 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:15:15 BoogieIcfgContainer [2020-08-21 14:15:15,224 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 14:15:15,225 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 14:15:15,225 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 14:15:15,228 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 14:15:15,229 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 02:15:14" (1/3) ... [2020-08-21 14:15:15,230 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@266332a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:15:15, skipping insertion in model container [2020-08-21 14:15:15,230 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:15:14" (2/3) ... [2020-08-21 14:15:15,230 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@266332a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:15:15, skipping insertion in model container [2020-08-21 14:15:15,230 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:15:15" (3/3) ... [2020-08-21 14:15:15,232 INFO L109 eAbstractionObserver]: Analyzing ICFG afnp2014.i [2020-08-21 14:15:15,242 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 14:15:15,250 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 14:15:15,263 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 14:15:15,286 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 14:15:15,286 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 14:15:15,286 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 14:15:15,286 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 14:15:15,287 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 14:15:15,287 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 14:15:15,287 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 14:15:15,287 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 14:15:15,305 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-21 14:15:15,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 14:15:15,311 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:15,312 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:15,312 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:15,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:15,317 INFO L82 PathProgramCache]: Analyzing trace with hash -1915647303, now seen corresponding path program 1 times [2020-08-21 14:15:15,324 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:15,324 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1784437847] [2020-08-21 14:15:15,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:15,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:15,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:15,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:15,428 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 14:15:15,429 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1784437847] [2020-08-21 14:15:15,430 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:15:15,431 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-21 14:15:15,432 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055731698] [2020-08-21 14:15:15,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-21 14:15:15,437 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:15,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-21 14:15:15,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 14:15:15,454 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-08-21 14:15:15,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:15,476 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-08-21 14:15:15,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-21 14:15:15,478 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-21 14:15:15,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:15,486 INFO L225 Difference]: With dead ends: 32 [2020-08-21 14:15:15,486 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 14:15:15,489 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 14:15:15,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 14:15:15,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 14:15:15,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 14:15:15,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-08-21 14:15:15,527 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-08-21 14:15:15,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:15,527 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-08-21 14:15:15,528 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-21 14:15:15,528 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-08-21 14:15:15,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 14:15:15,529 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:15,529 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:15,529 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 14:15:15,529 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:15,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:15,530 INFO L82 PathProgramCache]: Analyzing trace with hash 2084433522, now seen corresponding path program 1 times [2020-08-21 14:15:15,530 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:15,531 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [47991189] [2020-08-21 14:15:15,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:15,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:15,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:15,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:15,656 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 14:15:15,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [47991189] [2020-08-21 14:15:15,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:15:15,658 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 14:15:15,658 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038592254] [2020-08-21 14:15:15,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 14:15:15,660 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:15,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 14:15:15,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 14:15:15,662 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 5 states. [2020-08-21 14:15:15,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:15,714 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-08-21 14:15:15,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 14:15:15,715 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 14:15:15,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:15,717 INFO L225 Difference]: With dead ends: 21 [2020-08-21 14:15:15,718 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 14:15:15,719 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 14:15:15,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 14:15:15,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 14:15:15,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 14:15:15,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-21 14:15:15,727 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2020-08-21 14:15:15,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:15,728 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-21 14:15:15,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 14:15:15,729 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-21 14:15:15,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 14:15:15,730 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:15,730 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:15,730 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 14:15:15,730 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:15,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:15,731 INFO L82 PathProgramCache]: Analyzing trace with hash 249504553, now seen corresponding path program 1 times [2020-08-21 14:15:15,732 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:15,733 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [615906137] [2020-08-21 14:15:15,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:15,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:15,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:15,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:15,880 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:15,881 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [615906137] [2020-08-21 14:15:15,881 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:15,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 14:15:15,882 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794061308] [2020-08-21 14:15:15,882 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 14:15:15,883 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:15,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 14:15:15,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 14:15:15,884 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-08-21 14:15:15,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:15,962 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-21 14:15:15,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 14:15:15,963 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-08-21 14:15:15,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:15,965 INFO L225 Difference]: With dead ends: 24 [2020-08-21 14:15:15,965 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 14:15:15,966 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 14:15:15,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 14:15:15,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 14:15:15,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 14:15:15,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2020-08-21 14:15:15,975 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 15 [2020-08-21 14:15:15,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:15,976 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2020-08-21 14:15:15,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 14:15:15,976 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2020-08-21 14:15:15,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 14:15:15,978 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:15,979 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:15,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 14:15:15,979 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:15,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:15,980 INFO L82 PathProgramCache]: Analyzing trace with hash -2070634734, now seen corresponding path program 2 times [2020-08-21 14:15:15,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:15,981 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [378190740] [2020-08-21 14:15:15,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:16,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:16,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:16,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:16,109 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:16,110 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [378190740] [2020-08-21 14:15:16,110 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:16,110 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 14:15:16,110 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [10031674] [2020-08-21 14:15:16,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 14:15:16,111 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:16,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 14:15:16,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 14:15:16,112 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 7 states. [2020-08-21 14:15:16,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:16,188 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2020-08-21 14:15:16,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 14:15:16,189 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-21 14:15:16,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:16,190 INFO L225 Difference]: With dead ends: 27 [2020-08-21 14:15:16,190 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 14:15:16,191 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-21 14:15:16,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 14:15:16,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-21 14:15:16,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 14:15:16,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-08-21 14:15:16,197 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 18 [2020-08-21 14:15:16,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:16,198 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-08-21 14:15:16,198 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 14:15:16,198 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-08-21 14:15:16,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 14:15:16,199 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:16,200 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:16,200 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 14:15:16,200 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:16,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:16,201 INFO L82 PathProgramCache]: Analyzing trace with hash 1863528073, now seen corresponding path program 3 times [2020-08-21 14:15:16,201 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:16,201 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1330213897] [2020-08-21 14:15:16,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:16,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:16,314 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:16,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:16,319 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:16,319 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1330213897] [2020-08-21 14:15:16,320 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:16,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 14:15:16,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108451798] [2020-08-21 14:15:16,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 14:15:16,321 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:16,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 14:15:16,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-21 14:15:16,322 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 8 states. [2020-08-21 14:15:16,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:16,419 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-21 14:15:16,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 14:15:16,420 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-08-21 14:15:16,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:16,421 INFO L225 Difference]: With dead ends: 30 [2020-08-21 14:15:16,421 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 14:15:16,422 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-08-21 14:15:16,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 14:15:16,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 14:15:16,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 14:15:16,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-08-21 14:15:16,428 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 21 [2020-08-21 14:15:16,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:16,429 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-08-21 14:15:16,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 14:15:16,429 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-08-21 14:15:16,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 14:15:16,430 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:16,430 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:16,431 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 14:15:16,431 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:16,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:16,431 INFO L82 PathProgramCache]: Analyzing trace with hash -854829134, now seen corresponding path program 4 times [2020-08-21 14:15:16,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:16,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1513701894] [2020-08-21 14:15:16,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:16,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:16,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:16,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:16,584 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:16,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1513701894] [2020-08-21 14:15:16,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:16,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 14:15:16,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936617461] [2020-08-21 14:15:16,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 14:15:16,588 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:16,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 14:15:16,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 14:15:16,589 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 9 states. [2020-08-21 14:15:16,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:16,709 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2020-08-21 14:15:16,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 14:15:16,709 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-08-21 14:15:16,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:16,710 INFO L225 Difference]: With dead ends: 33 [2020-08-21 14:15:16,711 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 14:15:16,711 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-08-21 14:15:16,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 14:15:16,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-21 14:15:16,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 14:15:16,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2020-08-21 14:15:16,718 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 24 [2020-08-21 14:15:16,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:16,719 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2020-08-21 14:15:16,719 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 14:15:16,719 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2020-08-21 14:15:16,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 14:15:16,720 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:16,720 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:16,720 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 14:15:16,721 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:16,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:16,721 INFO L82 PathProgramCache]: Analyzing trace with hash -1826016791, now seen corresponding path program 5 times [2020-08-21 14:15:16,721 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:16,722 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [735085602] [2020-08-21 14:15:16,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:16,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:16,846 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:16,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:16,850 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:16,851 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [735085602] [2020-08-21 14:15:16,851 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:16,851 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 14:15:16,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446478955] [2020-08-21 14:15:16,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 14:15:16,852 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:16,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 14:15:16,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-21 14:15:16,853 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand 10 states. [2020-08-21 14:15:16,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:16,951 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-08-21 14:15:16,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 14:15:16,951 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-21 14:15:16,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:16,952 INFO L225 Difference]: With dead ends: 36 [2020-08-21 14:15:16,952 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 14:15:16,953 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-08-21 14:15:16,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 14:15:16,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-21 14:15:16,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 14:15:16,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2020-08-21 14:15:16,960 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 27 [2020-08-21 14:15:16,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:16,960 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2020-08-21 14:15:16,961 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 14:15:16,961 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2020-08-21 14:15:16,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 14:15:16,962 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:16,962 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:16,962 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 14:15:16,962 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:16,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:16,963 INFO L82 PathProgramCache]: Analyzing trace with hash 717166674, now seen corresponding path program 6 times [2020-08-21 14:15:16,963 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:16,963 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1565506374] [2020-08-21 14:15:16,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:16,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:17,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:17,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:17,102 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:17,102 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1565506374] [2020-08-21 14:15:17,102 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:17,103 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 14:15:17,103 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803747713] [2020-08-21 14:15:17,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 14:15:17,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:17,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 14:15:17,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-21 14:15:17,106 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 11 states. [2020-08-21 14:15:17,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:17,245 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-08-21 14:15:17,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 14:15:17,246 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-21 14:15:17,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:17,247 INFO L225 Difference]: With dead ends: 39 [2020-08-21 14:15:17,247 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 14:15:17,248 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2020-08-21 14:15:17,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 14:15:17,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 14:15:17,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 14:15:17,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-21 14:15:17,254 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 30 [2020-08-21 14:15:17,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:17,255 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-21 14:15:17,255 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 14:15:17,255 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-21 14:15:17,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 14:15:17,256 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:17,256 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:17,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 14:15:17,257 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:17,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:17,257 INFO L82 PathProgramCache]: Analyzing trace with hash 1472671049, now seen corresponding path program 7 times [2020-08-21 14:15:17,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:17,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [283352053] [2020-08-21 14:15:17,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:17,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:17,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:17,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:17,408 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:17,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [283352053] [2020-08-21 14:15:17,409 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:17,410 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 14:15:17,410 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635547166] [2020-08-21 14:15:17,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 14:15:17,411 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:17,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 14:15:17,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-08-21 14:15:17,412 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 12 states. [2020-08-21 14:15:17,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:17,612 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-08-21 14:15:17,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 14:15:17,612 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-08-21 14:15:17,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:17,613 INFO L225 Difference]: With dead ends: 42 [2020-08-21 14:15:17,613 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 14:15:17,614 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2020-08-21 14:15:17,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 14:15:17,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 14:15:17,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 14:15:17,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2020-08-21 14:15:17,626 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 33 [2020-08-21 14:15:17,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:17,629 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2020-08-21 14:15:17,629 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 14:15:17,629 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2020-08-21 14:15:17,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 14:15:17,631 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:17,637 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:17,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 14:15:17,638 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:17,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:17,638 INFO L82 PathProgramCache]: Analyzing trace with hash -1220091662, now seen corresponding path program 8 times [2020-08-21 14:15:17,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:17,639 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1481314836] [2020-08-21 14:15:17,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:17,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:17,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:17,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:17,869 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:17,869 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1481314836] [2020-08-21 14:15:17,869 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:17,870 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 14:15:17,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707399850] [2020-08-21 14:15:17,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 14:15:17,870 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:17,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 14:15:17,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-21 14:15:17,871 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand 13 states. [2020-08-21 14:15:18,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:18,060 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2020-08-21 14:15:18,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 14:15:18,061 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-21 14:15:18,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:18,062 INFO L225 Difference]: With dead ends: 45 [2020-08-21 14:15:18,063 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 14:15:18,063 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2020-08-21 14:15:18,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 14:15:18,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 14:15:18,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 14:15:18,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2020-08-21 14:15:18,076 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 36 [2020-08-21 14:15:18,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:18,077 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2020-08-21 14:15:18,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 14:15:18,077 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2020-08-21 14:15:18,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 14:15:18,080 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:18,080 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:18,080 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 14:15:18,081 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:18,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:18,083 INFO L82 PathProgramCache]: Analyzing trace with hash 85139625, now seen corresponding path program 9 times [2020-08-21 14:15:18,083 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:18,084 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [648445572] [2020-08-21 14:15:18,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:18,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:18,290 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:18,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:18,294 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:18,295 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [648445572] [2020-08-21 14:15:18,295 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:18,295 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 14:15:18,295 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589158221] [2020-08-21 14:15:18,296 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 14:15:18,296 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:18,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 14:15:18,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2020-08-21 14:15:18,297 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand 14 states. [2020-08-21 14:15:18,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:18,504 INFO L93 Difference]: Finished difference Result 48 states and 59 transitions. [2020-08-21 14:15:18,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 14:15:18,504 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-08-21 14:15:18,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:18,505 INFO L225 Difference]: With dead ends: 48 [2020-08-21 14:15:18,506 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 14:15:18,506 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2020-08-21 14:15:18,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 14:15:18,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 14:15:18,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 14:15:18,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 54 transitions. [2020-08-21 14:15:18,512 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 54 transitions. Word has length 39 [2020-08-21 14:15:18,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:18,513 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 54 transitions. [2020-08-21 14:15:18,513 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 14:15:18,513 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 54 transitions. [2020-08-21 14:15:18,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 14:15:18,514 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:18,514 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:18,514 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 14:15:18,514 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:18,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:18,515 INFO L82 PathProgramCache]: Analyzing trace with hash 1891479954, now seen corresponding path program 10 times [2020-08-21 14:15:18,515 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:18,515 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [394580390] [2020-08-21 14:15:18,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:18,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:18,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:18,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:18,707 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:18,707 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [394580390] [2020-08-21 14:15:18,707 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:18,707 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 14:15:18,708 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159573367] [2020-08-21 14:15:18,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 14:15:18,708 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:18,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 14:15:18,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-21 14:15:18,709 INFO L87 Difference]: Start difference. First operand 43 states and 54 transitions. Second operand 15 states. [2020-08-21 14:15:18,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:18,912 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2020-08-21 14:15:18,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 14:15:18,912 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-08-21 14:15:18,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:18,913 INFO L225 Difference]: With dead ends: 51 [2020-08-21 14:15:18,914 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 14:15:18,914 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2020-08-21 14:15:18,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 14:15:18,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 14:15:18,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 14:15:18,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 58 transitions. [2020-08-21 14:15:18,921 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 58 transitions. Word has length 42 [2020-08-21 14:15:18,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:18,921 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 58 transitions. [2020-08-21 14:15:18,921 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 14:15:18,921 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 58 transitions. [2020-08-21 14:15:18,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 14:15:18,922 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:18,923 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:18,923 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 14:15:18,923 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:18,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:18,923 INFO L82 PathProgramCache]: Analyzing trace with hash -1363997687, now seen corresponding path program 11 times [2020-08-21 14:15:18,924 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:18,924 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [662370593] [2020-08-21 14:15:18,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:18,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:19,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:19,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:19,131 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:19,131 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [662370593] [2020-08-21 14:15:19,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:19,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 14:15:19,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888325260] [2020-08-21 14:15:19,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 14:15:19,132 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:19,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 14:15:19,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2020-08-21 14:15:19,133 INFO L87 Difference]: Start difference. First operand 46 states and 58 transitions. Second operand 16 states. [2020-08-21 14:15:19,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:19,457 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2020-08-21 14:15:19,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 14:15:19,458 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 45 [2020-08-21 14:15:19,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:19,459 INFO L225 Difference]: With dead ends: 54 [2020-08-21 14:15:19,466 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 14:15:19,467 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2020-08-21 14:15:19,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 14:15:19,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 14:15:19,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 14:15:19,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2020-08-21 14:15:19,475 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 45 [2020-08-21 14:15:19,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:19,475 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-08-21 14:15:19,475 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 14:15:19,475 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2020-08-21 14:15:19,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 14:15:19,476 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:19,476 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:19,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 14:15:19,478 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:19,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:19,478 INFO L82 PathProgramCache]: Analyzing trace with hash -641889742, now seen corresponding path program 12 times [2020-08-21 14:15:19,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:19,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [818821993] [2020-08-21 14:15:19,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:19,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:19,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:19,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:19,686 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:19,686 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [818821993] [2020-08-21 14:15:19,686 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:19,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 14:15:19,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125077433] [2020-08-21 14:15:19,687 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 14:15:19,688 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:19,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 14:15:19,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-21 14:15:19,689 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 17 states. [2020-08-21 14:15:19,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:19,983 INFO L93 Difference]: Finished difference Result 57 states and 71 transitions. [2020-08-21 14:15:19,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 14:15:19,984 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-21 14:15:19,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:19,985 INFO L225 Difference]: With dead ends: 57 [2020-08-21 14:15:19,985 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 14:15:19,985 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2020-08-21 14:15:19,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 14:15:19,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-21 14:15:19,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 14:15:19,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2020-08-21 14:15:19,998 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 48 [2020-08-21 14:15:19,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:19,998 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2020-08-21 14:15:19,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 14:15:19,999 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2020-08-21 14:15:20,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 14:15:20,002 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:20,002 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:20,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 14:15:20,003 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:20,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:20,003 INFO L82 PathProgramCache]: Analyzing trace with hash -1815285911, now seen corresponding path program 13 times [2020-08-21 14:15:20,004 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:20,004 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2053487389] [2020-08-21 14:15:20,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:20,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:20,252 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:20,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:20,262 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:20,262 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2053487389] [2020-08-21 14:15:20,262 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:20,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 14:15:20,263 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994607958] [2020-08-21 14:15:20,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 14:15:20,264 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:20,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 14:15:20,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2020-08-21 14:15:20,264 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand 18 states. [2020-08-21 14:15:20,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:20,617 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2020-08-21 14:15:20,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 14:15:20,618 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 51 [2020-08-21 14:15:20,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:20,619 INFO L225 Difference]: With dead ends: 60 [2020-08-21 14:15:20,619 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 14:15:20,620 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2020-08-21 14:15:20,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 14:15:20,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 14:15:20,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 14:15:20,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2020-08-21 14:15:20,632 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 51 [2020-08-21 14:15:20,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:20,636 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2020-08-21 14:15:20,636 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 14:15:20,636 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2020-08-21 14:15:20,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 14:15:20,637 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:20,637 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:20,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 14:15:20,638 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:20,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:20,638 INFO L82 PathProgramCache]: Analyzing trace with hash -1721734446, now seen corresponding path program 14 times [2020-08-21 14:15:20,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:20,638 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [132172043] [2020-08-21 14:15:20,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:20,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:20,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:20,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:20,949 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:20,949 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [132172043] [2020-08-21 14:15:20,950 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:20,950 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 14:15:20,950 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716367000] [2020-08-21 14:15:20,950 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 14:15:20,951 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:20,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 14:15:20,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-21 14:15:20,951 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand 19 states. [2020-08-21 14:15:21,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:21,349 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-21 14:15:21,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 14:15:21,350 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 54 [2020-08-21 14:15:21,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:21,350 INFO L225 Difference]: With dead ends: 63 [2020-08-21 14:15:21,351 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 14:15:21,351 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=341, Unknown=0, NotChecked=0, Total=380 [2020-08-21 14:15:21,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 14:15:21,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-21 14:15:21,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 14:15:21,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2020-08-21 14:15:21,369 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 54 [2020-08-21 14:15:21,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:21,369 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2020-08-21 14:15:21,370 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 14:15:21,370 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2020-08-21 14:15:21,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 14:15:21,370 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:21,373 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:21,373 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 14:15:21,373 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:21,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:21,374 INFO L82 PathProgramCache]: Analyzing trace with hash 2131151561, now seen corresponding path program 15 times [2020-08-21 14:15:21,374 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:21,374 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [677350681] [2020-08-21 14:15:21,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:21,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:21,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:21,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:21,723 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:21,723 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [677350681] [2020-08-21 14:15:21,724 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:21,724 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 14:15:21,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1185038776] [2020-08-21 14:15:21,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 14:15:21,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:21,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 14:15:21,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2020-08-21 14:15:21,728 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand 20 states. [2020-08-21 14:15:22,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:22,134 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2020-08-21 14:15:22,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 14:15:22,134 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 57 [2020-08-21 14:15:22,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:22,135 INFO L225 Difference]: With dead ends: 66 [2020-08-21 14:15:22,135 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 14:15:22,136 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=379, Unknown=0, NotChecked=0, Total=420 [2020-08-21 14:15:22,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 14:15:22,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-08-21 14:15:22,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 14:15:22,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 78 transitions. [2020-08-21 14:15:22,149 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 78 transitions. Word has length 57 [2020-08-21 14:15:22,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:22,149 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 78 transitions. [2020-08-21 14:15:22,149 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 14:15:22,149 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 78 transitions. [2020-08-21 14:15:22,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 14:15:22,150 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:22,150 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:22,151 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 14:15:22,151 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:22,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:22,151 INFO L82 PathProgramCache]: Analyzing trace with hash 457200498, now seen corresponding path program 16 times [2020-08-21 14:15:22,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:22,152 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [928792541] [2020-08-21 14:15:22,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:22,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:22,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:22,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:22,478 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:22,478 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [928792541] [2020-08-21 14:15:22,479 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:22,479 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 14:15:22,479 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418841489] [2020-08-21 14:15:22,479 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 14:15:22,480 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:22,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 14:15:22,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-21 14:15:22,481 INFO L87 Difference]: Start difference. First operand 61 states and 78 transitions. Second operand 21 states. [2020-08-21 14:15:22,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:22,965 INFO L93 Difference]: Finished difference Result 69 states and 87 transitions. [2020-08-21 14:15:22,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 14:15:22,966 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 60 [2020-08-21 14:15:22,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:22,967 INFO L225 Difference]: With dead ends: 69 [2020-08-21 14:15:22,967 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 14:15:22,969 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2020-08-21 14:15:22,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 14:15:22,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-08-21 14:15:22,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-21 14:15:22,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 82 transitions. [2020-08-21 14:15:22,977 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 82 transitions. Word has length 60 [2020-08-21 14:15:22,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:22,977 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 82 transitions. [2020-08-21 14:15:22,977 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 14:15:22,977 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 82 transitions. [2020-08-21 14:15:22,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-21 14:15:22,978 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:22,978 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:22,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 14:15:22,979 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:22,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:22,979 INFO L82 PathProgramCache]: Analyzing trace with hash 646356521, now seen corresponding path program 17 times [2020-08-21 14:15:22,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:22,979 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1296486159] [2020-08-21 14:15:22,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:22,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:23,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:23,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:23,308 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 459 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:23,309 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1296486159] [2020-08-21 14:15:23,309 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:23,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 14:15:23,309 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161967725] [2020-08-21 14:15:23,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 14:15:23,310 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:23,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 14:15:23,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2020-08-21 14:15:23,311 INFO L87 Difference]: Start difference. First operand 64 states and 82 transitions. Second operand 22 states. [2020-08-21 14:15:23,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:23,805 INFO L93 Difference]: Finished difference Result 72 states and 91 transitions. [2020-08-21 14:15:23,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 14:15:23,806 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 63 [2020-08-21 14:15:23,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:23,807 INFO L225 Difference]: With dead ends: 72 [2020-08-21 14:15:23,807 INFO L226 Difference]: Without dead ends: 67 [2020-08-21 14:15:23,808 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=461, Unknown=0, NotChecked=0, Total=506 [2020-08-21 14:15:23,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-21 14:15:23,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-08-21 14:15:23,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 14:15:23,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 86 transitions. [2020-08-21 14:15:23,815 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 86 transitions. Word has length 63 [2020-08-21 14:15:23,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:23,815 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 86 transitions. [2020-08-21 14:15:23,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 14:15:23,815 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 86 transitions. [2020-08-21 14:15:23,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 14:15:23,816 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:23,816 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:23,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 14:15:23,817 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:23,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:23,817 INFO L82 PathProgramCache]: Analyzing trace with hash 796345362, now seen corresponding path program 18 times [2020-08-21 14:15:23,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:23,817 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1363703729] [2020-08-21 14:15:23,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:23,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:24,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:24,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:24,201 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:24,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1363703729] [2020-08-21 14:15:24,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:24,202 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 14:15:24,202 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810807944] [2020-08-21 14:15:24,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 14:15:24,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:24,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 14:15:24,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-21 14:15:24,203 INFO L87 Difference]: Start difference. First operand 67 states and 86 transitions. Second operand 23 states. [2020-08-21 14:15:24,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:24,735 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2020-08-21 14:15:24,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 14:15:24,735 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 66 [2020-08-21 14:15:24,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:24,736 INFO L225 Difference]: With dead ends: 75 [2020-08-21 14:15:24,737 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 14:15:24,737 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=505, Unknown=0, NotChecked=0, Total=552 [2020-08-21 14:15:24,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 14:15:24,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-08-21 14:15:24,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-21 14:15:24,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 90 transitions. [2020-08-21 14:15:24,755 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 90 transitions. Word has length 66 [2020-08-21 14:15:24,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:24,756 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 90 transitions. [2020-08-21 14:15:24,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 14:15:24,756 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 90 transitions. [2020-08-21 14:15:24,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-21 14:15:24,757 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:24,757 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:24,757 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 14:15:24,757 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:24,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:24,758 INFO L82 PathProgramCache]: Analyzing trace with hash -1947047543, now seen corresponding path program 19 times [2020-08-21 14:15:24,758 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:24,758 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1458084982] [2020-08-21 14:15:24,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:24,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:25,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:25,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:25,213 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:25,214 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1458084982] [2020-08-21 14:15:25,214 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:25,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 14:15:25,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166656793] [2020-08-21 14:15:25,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 14:15:25,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:25,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 14:15:25,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2020-08-21 14:15:25,216 INFO L87 Difference]: Start difference. First operand 70 states and 90 transitions. Second operand 24 states. [2020-08-21 14:15:25,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:25,785 INFO L93 Difference]: Finished difference Result 78 states and 99 transitions. [2020-08-21 14:15:25,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 14:15:25,786 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 69 [2020-08-21 14:15:25,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:25,787 INFO L225 Difference]: With dead ends: 78 [2020-08-21 14:15:25,787 INFO L226 Difference]: Without dead ends: 73 [2020-08-21 14:15:25,788 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=551, Unknown=0, NotChecked=0, Total=600 [2020-08-21 14:15:25,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-21 14:15:25,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2020-08-21 14:15:25,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 14:15:25,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 94 transitions. [2020-08-21 14:15:25,795 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 94 transitions. Word has length 69 [2020-08-21 14:15:25,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:25,795 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 94 transitions. [2020-08-21 14:15:25,795 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 14:15:25,795 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 94 transitions. [2020-08-21 14:15:25,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 14:15:25,796 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:25,796 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:25,796 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 14:15:25,796 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:25,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:25,797 INFO L82 PathProgramCache]: Analyzing trace with hash -1432404814, now seen corresponding path program 20 times [2020-08-21 14:15:25,797 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:25,797 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1957420614] [2020-08-21 14:15:25,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:25,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:26,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:26,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:26,263 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:26,264 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1957420614] [2020-08-21 14:15:26,264 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:26,264 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 14:15:26,264 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391601259] [2020-08-21 14:15:26,265 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 14:15:26,265 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:26,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 14:15:26,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-21 14:15:26,266 INFO L87 Difference]: Start difference. First operand 73 states and 94 transitions. Second operand 25 states. [2020-08-21 14:15:26,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:26,887 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2020-08-21 14:15:26,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 14:15:26,889 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 72 [2020-08-21 14:15:26,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:26,890 INFO L225 Difference]: With dead ends: 81 [2020-08-21 14:15:26,891 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 14:15:26,891 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=599, Unknown=0, NotChecked=0, Total=650 [2020-08-21 14:15:26,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 14:15:26,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-08-21 14:15:26,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-21 14:15:26,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 98 transitions. [2020-08-21 14:15:26,898 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 98 transitions. Word has length 72 [2020-08-21 14:15:26,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:26,898 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 98 transitions. [2020-08-21 14:15:26,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 14:15:26,898 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 98 transitions. [2020-08-21 14:15:26,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-21 14:15:26,899 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:26,899 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:26,899 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 14:15:26,899 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:26,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:26,900 INFO L82 PathProgramCache]: Analyzing trace with hash 1550855401, now seen corresponding path program 21 times [2020-08-21 14:15:26,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:26,900 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1281971720] [2020-08-21 14:15:26,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:26,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:27,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:27,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:27,460 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 0 proven. 693 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:27,466 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1281971720] [2020-08-21 14:15:27,466 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:27,466 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 14:15:27,467 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244620043] [2020-08-21 14:15:27,467 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 14:15:27,467 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:27,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 14:15:27,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2020-08-21 14:15:27,468 INFO L87 Difference]: Start difference. First operand 76 states and 98 transitions. Second operand 26 states. [2020-08-21 14:15:28,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:28,224 INFO L93 Difference]: Finished difference Result 84 states and 107 transitions. [2020-08-21 14:15:28,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 14:15:28,225 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 75 [2020-08-21 14:15:28,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:28,226 INFO L225 Difference]: With dead ends: 84 [2020-08-21 14:15:28,226 INFO L226 Difference]: Without dead ends: 79 [2020-08-21 14:15:28,227 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2020-08-21 14:15:28,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-21 14:15:28,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2020-08-21 14:15:28,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 14:15:28,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 102 transitions. [2020-08-21 14:15:28,237 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 102 transitions. Word has length 75 [2020-08-21 14:15:28,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:28,238 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 102 transitions. [2020-08-21 14:15:28,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 14:15:28,238 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 102 transitions. [2020-08-21 14:15:28,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 14:15:28,239 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:28,240 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:28,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 14:15:28,240 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:28,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:28,241 INFO L82 PathProgramCache]: Analyzing trace with hash 97664338, now seen corresponding path program 22 times [2020-08-21 14:15:28,241 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:28,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1422362193] [2020-08-21 14:15:28,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:28,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:28,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:28,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:28,754 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 0 proven. 759 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:28,754 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1422362193] [2020-08-21 14:15:28,755 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:28,755 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 14:15:28,755 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940238790] [2020-08-21 14:15:28,755 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 14:15:28,756 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:28,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 14:15:28,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-21 14:15:28,758 INFO L87 Difference]: Start difference. First operand 79 states and 102 transitions. Second operand 27 states. [2020-08-21 14:15:29,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:29,498 INFO L93 Difference]: Finished difference Result 87 states and 111 transitions. [2020-08-21 14:15:29,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 14:15:29,499 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 78 [2020-08-21 14:15:29,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:29,500 INFO L225 Difference]: With dead ends: 87 [2020-08-21 14:15:29,500 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 14:15:29,501 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2020-08-21 14:15:29,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 14:15:29,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2020-08-21 14:15:29,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-21 14:15:29,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 106 transitions. [2020-08-21 14:15:29,507 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 106 transitions. Word has length 78 [2020-08-21 14:15:29,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:29,508 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 106 transitions. [2020-08-21 14:15:29,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 14:15:29,508 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 106 transitions. [2020-08-21 14:15:29,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-21 14:15:29,508 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:29,509 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:29,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 14:15:29,509 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:29,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:29,509 INFO L82 PathProgramCache]: Analyzing trace with hash 1353050185, now seen corresponding path program 23 times [2020-08-21 14:15:29,510 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:29,510 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [490154074] [2020-08-21 14:15:29,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:29,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:30,030 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:30,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:30,044 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 0 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:30,044 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [490154074] [2020-08-21 14:15:30,045 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:30,045 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 14:15:30,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933013668] [2020-08-21 14:15:30,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 14:15:30,045 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:30,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 14:15:30,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2020-08-21 14:15:30,046 INFO L87 Difference]: Start difference. First operand 82 states and 106 transitions. Second operand 28 states. [2020-08-21 14:15:30,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:30,880 INFO L93 Difference]: Finished difference Result 90 states and 115 transitions. [2020-08-21 14:15:30,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 14:15:30,880 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 81 [2020-08-21 14:15:30,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:30,881 INFO L225 Difference]: With dead ends: 90 [2020-08-21 14:15:30,882 INFO L226 Difference]: Without dead ends: 85 [2020-08-21 14:15:30,882 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=57, Invalid=755, Unknown=0, NotChecked=0, Total=812 [2020-08-21 14:15:30,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-21 14:15:30,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2020-08-21 14:15:30,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 14:15:30,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 110 transitions. [2020-08-21 14:15:30,889 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 110 transitions. Word has length 81 [2020-08-21 14:15:30,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:30,890 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 110 transitions. [2020-08-21 14:15:30,890 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 14:15:30,890 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 110 transitions. [2020-08-21 14:15:30,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 14:15:30,891 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:30,891 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:30,891 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 14:15:30,891 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:30,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:30,892 INFO L82 PathProgramCache]: Analyzing trace with hash -22395406, now seen corresponding path program 24 times [2020-08-21 14:15:30,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:30,892 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2096519963] [2020-08-21 14:15:30,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:30,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:31,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:31,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:31,560 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:31,561 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2096519963] [2020-08-21 14:15:31,561 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:31,561 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 14:15:31,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334431690] [2020-08-21 14:15:31,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 14:15:31,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:31,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 14:15:31,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-08-21 14:15:31,566 INFO L87 Difference]: Start difference. First operand 85 states and 110 transitions. Second operand 29 states. [2020-08-21 14:15:32,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:32,572 INFO L93 Difference]: Finished difference Result 93 states and 119 transitions. [2020-08-21 14:15:32,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 14:15:32,573 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 84 [2020-08-21 14:15:32,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:32,574 INFO L225 Difference]: With dead ends: 93 [2020-08-21 14:15:32,574 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 14:15:32,575 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2020-08-21 14:15:32,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 14:15:32,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-08-21 14:15:32,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-21 14:15:32,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 114 transitions. [2020-08-21 14:15:32,581 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 114 transitions. Word has length 84 [2020-08-21 14:15:32,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:32,581 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 114 transitions. [2020-08-21 14:15:32,581 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 14:15:32,581 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 114 transitions. [2020-08-21 14:15:32,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-21 14:15:32,582 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:32,582 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:32,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 14:15:32,582 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:32,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:32,583 INFO L82 PathProgramCache]: Analyzing trace with hash -1933993047, now seen corresponding path program 25 times [2020-08-21 14:15:32,583 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:32,583 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1029876430] [2020-08-21 14:15:32,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:32,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:33,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:33,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:33,278 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 0 proven. 975 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:33,278 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1029876430] [2020-08-21 14:15:33,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:33,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 14:15:33,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450361580] [2020-08-21 14:15:33,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 14:15:33,280 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:33,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 14:15:33,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2020-08-21 14:15:33,281 INFO L87 Difference]: Start difference. First operand 88 states and 114 transitions. Second operand 30 states. [2020-08-21 14:15:34,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:34,242 INFO L93 Difference]: Finished difference Result 96 states and 123 transitions. [2020-08-21 14:15:34,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 14:15:34,242 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 87 [2020-08-21 14:15:34,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:34,244 INFO L225 Difference]: With dead ends: 96 [2020-08-21 14:15:34,244 INFO L226 Difference]: Without dead ends: 91 [2020-08-21 14:15:34,245 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=61, Invalid=869, Unknown=0, NotChecked=0, Total=930 [2020-08-21 14:15:34,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-21 14:15:34,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2020-08-21 14:15:34,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 14:15:34,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 118 transitions. [2020-08-21 14:15:34,252 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 118 transitions. Word has length 87 [2020-08-21 14:15:34,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:34,252 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 118 transitions. [2020-08-21 14:15:34,252 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 14:15:34,252 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 118 transitions. [2020-08-21 14:15:34,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 14:15:34,253 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:34,253 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:34,254 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 14:15:34,254 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:34,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:34,254 INFO L82 PathProgramCache]: Analyzing trace with hash 927028882, now seen corresponding path program 26 times [2020-08-21 14:15:34,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:34,255 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2017771389] [2020-08-21 14:15:34,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:34,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:34,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:34,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:34,853 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 0 proven. 1053 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:34,854 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2017771389] [2020-08-21 14:15:34,854 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:34,854 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 14:15:34,854 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653039191] [2020-08-21 14:15:34,854 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 14:15:34,855 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:34,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 14:15:34,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-08-21 14:15:34,855 INFO L87 Difference]: Start difference. First operand 91 states and 118 transitions. Second operand 31 states. [2020-08-21 14:15:35,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:35,892 INFO L93 Difference]: Finished difference Result 99 states and 127 transitions. [2020-08-21 14:15:35,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 14:15:35,892 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 90 [2020-08-21 14:15:35,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:35,894 INFO L225 Difference]: With dead ends: 99 [2020-08-21 14:15:35,894 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 14:15:35,895 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2020-08-21 14:15:35,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 14:15:35,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2020-08-21 14:15:35,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-08-21 14:15:35,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 122 transitions. [2020-08-21 14:15:35,902 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 122 transitions. Word has length 90 [2020-08-21 14:15:35,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:35,903 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 122 transitions. [2020-08-21 14:15:35,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 14:15:35,903 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 122 transitions. [2020-08-21 14:15:35,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-08-21 14:15:35,904 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:35,904 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:35,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 14:15:35,905 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:35,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:35,905 INFO L82 PathProgramCache]: Analyzing trace with hash 5326601, now seen corresponding path program 27 times [2020-08-21 14:15:35,905 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:35,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [424638894] [2020-08-21 14:15:35,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:35,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:36,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:36,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:36,642 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 0 proven. 1134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:36,642 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [424638894] [2020-08-21 14:15:36,642 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:36,642 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 14:15:36,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144341432] [2020-08-21 14:15:36,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 14:15:36,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:36,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 14:15:36,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2020-08-21 14:15:36,643 INFO L87 Difference]: Start difference. First operand 94 states and 122 transitions. Second operand 32 states. [2020-08-21 14:15:37,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:37,808 INFO L93 Difference]: Finished difference Result 102 states and 131 transitions. [2020-08-21 14:15:37,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 14:15:37,809 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 93 [2020-08-21 14:15:37,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:37,810 INFO L225 Difference]: With dead ends: 102 [2020-08-21 14:15:37,810 INFO L226 Difference]: Without dead ends: 97 [2020-08-21 14:15:37,811 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=65, Invalid=991, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 14:15:37,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-08-21 14:15:37,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2020-08-21 14:15:37,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 14:15:37,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 126 transitions. [2020-08-21 14:15:37,820 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 126 transitions. Word has length 93 [2020-08-21 14:15:37,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:37,820 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 126 transitions. [2020-08-21 14:15:37,820 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 14:15:37,820 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 126 transitions. [2020-08-21 14:15:37,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 14:15:37,821 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:37,821 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:37,822 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 14:15:37,822 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:37,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:37,822 INFO L82 PathProgramCache]: Analyzing trace with hash -701403342, now seen corresponding path program 28 times [2020-08-21 14:15:37,822 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:37,822 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1230931888] [2020-08-21 14:15:37,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:37,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:38,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:38,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:38,600 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 1218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:38,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1230931888] [2020-08-21 14:15:38,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:38,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 14:15:38,601 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134706076] [2020-08-21 14:15:38,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 14:15:38,601 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:38,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 14:15:38,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 14:15:38,602 INFO L87 Difference]: Start difference. First operand 97 states and 126 transitions. Second operand 33 states. [2020-08-21 14:15:39,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:39,841 INFO L93 Difference]: Finished difference Result 105 states and 135 transitions. [2020-08-21 14:15:39,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 14:15:39,841 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 96 [2020-08-21 14:15:39,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:39,843 INFO L225 Difference]: With dead ends: 105 [2020-08-21 14:15:39,843 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 14:15:39,844 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=67, Invalid=1055, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 14:15:39,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 14:15:39,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2020-08-21 14:15:39,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-08-21 14:15:39,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 130 transitions. [2020-08-21 14:15:39,853 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 130 transitions. Word has length 96 [2020-08-21 14:15:39,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:39,854 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 130 transitions. [2020-08-21 14:15:39,854 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 14:15:39,854 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 130 transitions. [2020-08-21 14:15:39,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-08-21 14:15:39,855 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:39,855 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:39,855 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 14:15:39,855 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:39,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:39,856 INFO L82 PathProgramCache]: Analyzing trace with hash -963450263, now seen corresponding path program 29 times [2020-08-21 14:15:39,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:39,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1820593876] [2020-08-21 14:15:39,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:39,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:40,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:40,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:40,639 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 0 proven. 1305 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:40,640 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1820593876] [2020-08-21 14:15:40,640 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:40,640 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 14:15:40,640 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441898302] [2020-08-21 14:15:40,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 14:15:40,641 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:40,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 14:15:40,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 14:15:40,641 INFO L87 Difference]: Start difference. First operand 100 states and 130 transitions. Second operand 34 states. [2020-08-21 14:15:41,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:41,923 INFO L93 Difference]: Finished difference Result 108 states and 139 transitions. [2020-08-21 14:15:41,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 14:15:41,923 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 99 [2020-08-21 14:15:41,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:41,925 INFO L225 Difference]: With dead ends: 108 [2020-08-21 14:15:41,925 INFO L226 Difference]: Without dead ends: 103 [2020-08-21 14:15:41,926 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=69, Invalid=1121, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 14:15:41,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-08-21 14:15:41,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-08-21 14:15:41,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 14:15:41,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 134 transitions. [2020-08-21 14:15:41,934 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 134 transitions. Word has length 99 [2020-08-21 14:15:41,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:41,935 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 134 transitions. [2020-08-21 14:15:41,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 14:15:41,935 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 134 transitions. [2020-08-21 14:15:41,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 14:15:41,936 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:41,936 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:41,936 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 14:15:41,936 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:41,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:41,937 INFO L82 PathProgramCache]: Analyzing trace with hash 647270354, now seen corresponding path program 30 times [2020-08-21 14:15:41,937 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:41,937 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2084120978] [2020-08-21 14:15:41,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:41,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:42,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:42,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:42,779 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 0 proven. 1395 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:42,779 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2084120978] [2020-08-21 14:15:42,779 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:42,779 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 14:15:42,780 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092029292] [2020-08-21 14:15:42,780 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 14:15:42,780 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:42,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 14:15:42,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 14:15:42,781 INFO L87 Difference]: Start difference. First operand 103 states and 134 transitions. Second operand 35 states. [2020-08-21 14:15:44,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:44,148 INFO L93 Difference]: Finished difference Result 111 states and 143 transitions. [2020-08-21 14:15:44,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 14:15:44,155 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 102 [2020-08-21 14:15:44,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:44,156 INFO L225 Difference]: With dead ends: 111 [2020-08-21 14:15:44,156 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 14:15:44,157 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=71, Invalid=1189, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 14:15:44,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 14:15:44,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2020-08-21 14:15:44,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-08-21 14:15:44,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 138 transitions. [2020-08-21 14:15:44,167 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 138 transitions. Word has length 102 [2020-08-21 14:15:44,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:44,167 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 138 transitions. [2020-08-21 14:15:44,167 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 14:15:44,167 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 138 transitions. [2020-08-21 14:15:44,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-08-21 14:15:44,168 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:44,168 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:44,169 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 14:15:44,169 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:44,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:44,169 INFO L82 PathProgramCache]: Analyzing trace with hash -2044426807, now seen corresponding path program 31 times [2020-08-21 14:15:44,169 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:44,169 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [952467915] [2020-08-21 14:15:44,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:44,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:45,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:45,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:45,044 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 0 proven. 1488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:45,045 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [952467915] [2020-08-21 14:15:45,045 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:45,045 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 14:15:45,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209956252] [2020-08-21 14:15:45,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 14:15:45,045 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:45,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 14:15:45,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 14:15:45,046 INFO L87 Difference]: Start difference. First operand 106 states and 138 transitions. Second operand 36 states. [2020-08-21 14:15:46,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:46,534 INFO L93 Difference]: Finished difference Result 114 states and 147 transitions. [2020-08-21 14:15:46,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 14:15:46,535 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 105 [2020-08-21 14:15:46,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:46,537 INFO L225 Difference]: With dead ends: 114 [2020-08-21 14:15:46,537 INFO L226 Difference]: Without dead ends: 109 [2020-08-21 14:15:46,538 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=73, Invalid=1259, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 14:15:46,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-08-21 14:15:46,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2020-08-21 14:15:46,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-21 14:15:46,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 142 transitions. [2020-08-21 14:15:46,547 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 142 transitions. Word has length 105 [2020-08-21 14:15:46,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:46,547 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 142 transitions. [2020-08-21 14:15:46,547 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 14:15:46,548 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 142 transitions. [2020-08-21 14:15:46,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-21 14:15:46,548 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:46,549 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:46,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 14:15:46,549 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:46,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:46,549 INFO L82 PathProgramCache]: Analyzing trace with hash 939833458, now seen corresponding path program 32 times [2020-08-21 14:15:46,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:46,550 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1856435419] [2020-08-21 14:15:46,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:46,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:47,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:47,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:47,469 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 0 proven. 1584 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:47,469 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1856435419] [2020-08-21 14:15:47,469 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:47,470 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 14:15:47,470 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [986863501] [2020-08-21 14:15:47,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 14:15:47,470 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:47,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 14:15:47,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 14:15:47,471 INFO L87 Difference]: Start difference. First operand 109 states and 142 transitions. Second operand 37 states. [2020-08-21 14:15:49,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:49,034 INFO L93 Difference]: Finished difference Result 117 states and 151 transitions. [2020-08-21 14:15:49,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 14:15:49,034 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 108 [2020-08-21 14:15:49,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:49,036 INFO L225 Difference]: With dead ends: 117 [2020-08-21 14:15:49,036 INFO L226 Difference]: Without dead ends: 112 [2020-08-21 14:15:49,037 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=75, Invalid=1331, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 14:15:49,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-21 14:15:49,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2020-08-21 14:15:49,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-08-21 14:15:49,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 146 transitions. [2020-08-21 14:15:49,047 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 146 transitions. Word has length 108 [2020-08-21 14:15:49,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:49,047 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 146 transitions. [2020-08-21 14:15:49,047 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 14:15:49,047 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 146 transitions. [2020-08-21 14:15:49,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-08-21 14:15:49,048 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:49,048 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:49,049 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 14:15:49,049 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:49,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:49,049 INFO L82 PathProgramCache]: Analyzing trace with hash -785639127, now seen corresponding path program 33 times [2020-08-21 14:15:49,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:49,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [102177846] [2020-08-21 14:15:49,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:49,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:50,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:50,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:50,044 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 0 proven. 1683 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:50,045 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [102177846] [2020-08-21 14:15:50,045 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:50,045 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 14:15:50,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511318968] [2020-08-21 14:15:50,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 14:15:50,045 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:50,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 14:15:50,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 14:15:50,046 INFO L87 Difference]: Start difference. First operand 112 states and 146 transitions. Second operand 38 states. [2020-08-21 14:15:51,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:51,710 INFO L93 Difference]: Finished difference Result 120 states and 155 transitions. [2020-08-21 14:15:51,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 14:15:51,711 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 111 [2020-08-21 14:15:51,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:51,713 INFO L225 Difference]: With dead ends: 120 [2020-08-21 14:15:51,713 INFO L226 Difference]: Without dead ends: 115 [2020-08-21 14:15:51,714 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=77, Invalid=1405, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 14:15:51,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-08-21 14:15:51,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2020-08-21 14:15:51,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-21 14:15:51,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 150 transitions. [2020-08-21 14:15:51,722 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 150 transitions. Word has length 111 [2020-08-21 14:15:51,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:51,723 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 150 transitions. [2020-08-21 14:15:51,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 14:15:51,723 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 150 transitions. [2020-08-21 14:15:51,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-21 14:15:51,724 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:51,724 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:51,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 14:15:51,724 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:51,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:51,724 INFO L82 PathProgramCache]: Analyzing trace with hash 2124146962, now seen corresponding path program 34 times [2020-08-21 14:15:51,725 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:51,725 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [457967190] [2020-08-21 14:15:51,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:51,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:52,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:52,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:52,781 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 0 proven. 1785 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:52,781 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [457967190] [2020-08-21 14:15:52,781 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:52,781 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 14:15:52,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616269810] [2020-08-21 14:15:52,782 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 14:15:52,782 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:52,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 14:15:52,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 14:15:52,783 INFO L87 Difference]: Start difference. First operand 115 states and 150 transitions. Second operand 39 states. [2020-08-21 14:15:54,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:54,542 INFO L93 Difference]: Finished difference Result 123 states and 159 transitions. [2020-08-21 14:15:54,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 14:15:54,542 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 114 [2020-08-21 14:15:54,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:54,544 INFO L225 Difference]: With dead ends: 123 [2020-08-21 14:15:54,544 INFO L226 Difference]: Without dead ends: 118 [2020-08-21 14:15:54,545 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=79, Invalid=1481, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 14:15:54,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-21 14:15:54,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2020-08-21 14:15:54,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-08-21 14:15:54,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 154 transitions. [2020-08-21 14:15:54,555 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 154 transitions. Word has length 114 [2020-08-21 14:15:54,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:54,555 INFO L479 AbstractCegarLoop]: Abstraction has 118 states and 154 transitions. [2020-08-21 14:15:54,556 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 14:15:54,556 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 154 transitions. [2020-08-21 14:15:54,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-08-21 14:15:54,556 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:54,557 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:54,557 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 14:15:54,557 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:54,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:54,557 INFO L82 PathProgramCache]: Analyzing trace with hash -2058378103, now seen corresponding path program 35 times [2020-08-21 14:15:54,557 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:54,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1715158674] [2020-08-21 14:15:54,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:54,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:55,619 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:55,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:55,640 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 0 proven. 1890 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:55,641 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1715158674] [2020-08-21 14:15:55,641 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:55,641 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 14:15:55,641 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753176810] [2020-08-21 14:15:55,641 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 14:15:55,642 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:55,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 14:15:55,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 14:15:55,643 INFO L87 Difference]: Start difference. First operand 118 states and 154 transitions. Second operand 40 states. [2020-08-21 14:15:57,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:57,528 INFO L93 Difference]: Finished difference Result 126 states and 163 transitions. [2020-08-21 14:15:57,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 14:15:57,529 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 117 [2020-08-21 14:15:57,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:57,531 INFO L225 Difference]: With dead ends: 126 [2020-08-21 14:15:57,531 INFO L226 Difference]: Without dead ends: 121 [2020-08-21 14:15:57,532 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=81, Invalid=1559, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 14:15:57,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-08-21 14:15:57,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2020-08-21 14:15:57,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-21 14:15:57,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 158 transitions. [2020-08-21 14:15:57,542 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 158 transitions. Word has length 117 [2020-08-21 14:15:57,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:57,543 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 158 transitions. [2020-08-21 14:15:57,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 14:15:57,543 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 158 transitions. [2020-08-21 14:15:57,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-21 14:15:57,544 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:57,544 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:57,544 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 14:15:57,544 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:57,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:57,545 INFO L82 PathProgramCache]: Analyzing trace with hash 1928602034, now seen corresponding path program 36 times [2020-08-21 14:15:57,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:57,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1046681171] [2020-08-21 14:15:57,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:57,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:58,682 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:58,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:58,704 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 0 proven. 1998 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:58,704 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1046681171] [2020-08-21 14:15:58,705 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:58,705 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 14:15:58,705 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92686165] [2020-08-21 14:15:58,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 14:15:58,706 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:58,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 14:15:58,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 14:15:58,707 INFO L87 Difference]: Start difference. First operand 121 states and 158 transitions. Second operand 41 states. [2020-08-21 14:16:00,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:16:00,608 INFO L93 Difference]: Finished difference Result 129 states and 167 transitions. [2020-08-21 14:16:00,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 14:16:00,609 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 120 [2020-08-21 14:16:00,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:16:00,610 INFO L225 Difference]: With dead ends: 129 [2020-08-21 14:16:00,610 INFO L226 Difference]: Without dead ends: 124 [2020-08-21 14:16:00,611 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=83, Invalid=1639, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 14:16:00,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-21 14:16:00,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2020-08-21 14:16:00,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-08-21 14:16:00,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2020-08-21 14:16:00,620 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 120 [2020-08-21 14:16:00,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:16:00,620 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2020-08-21 14:16:00,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 14:16:00,620 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2020-08-21 14:16:00,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-08-21 14:16:00,621 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:16:00,621 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:16:00,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 14:16:00,622 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:16:00,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:16:00,622 INFO L82 PathProgramCache]: Analyzing trace with hash 733292521, now seen corresponding path program 37 times [2020-08-21 14:16:00,622 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:16:00,622 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [280235682] [2020-08-21 14:16:00,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:16:00,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:16:01,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:16:01,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:16:01,842 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 0 proven. 2109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:16:01,842 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [280235682] [2020-08-21 14:16:01,842 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:16:01,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 14:16:01,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263025192] [2020-08-21 14:16:01,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 14:16:01,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:16:01,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 14:16:01,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 14:16:01,844 INFO L87 Difference]: Start difference. First operand 124 states and 162 transitions. Second operand 42 states. [2020-08-21 14:16:03,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:16:03,930 INFO L93 Difference]: Finished difference Result 132 states and 171 transitions. [2020-08-21 14:16:03,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 14:16:03,930 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 123 [2020-08-21 14:16:03,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:16:03,932 INFO L225 Difference]: With dead ends: 132 [2020-08-21 14:16:03,932 INFO L226 Difference]: Without dead ends: 127 [2020-08-21 14:16:03,933 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=85, Invalid=1721, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 14:16:03,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-08-21 14:16:03,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2020-08-21 14:16:03,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-21 14:16:03,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 166 transitions. [2020-08-21 14:16:03,944 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 166 transitions. Word has length 123 [2020-08-21 14:16:03,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:16:03,945 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 166 transitions. [2020-08-21 14:16:03,945 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 14:16:03,945 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 166 transitions. [2020-08-21 14:16:03,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-21 14:16:03,946 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:16:03,946 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:16:03,946 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 14:16:03,946 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:16:03,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:16:03,947 INFO L82 PathProgramCache]: Analyzing trace with hash 841441874, now seen corresponding path program 38 times [2020-08-21 14:16:03,947 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:16:03,947 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [546711641] [2020-08-21 14:16:03,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:16:03,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:16:05,230 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:16:05,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:16:05,255 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 0 proven. 2223 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:16:05,256 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [546711641] [2020-08-21 14:16:05,256 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:16:05,256 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 14:16:05,256 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895751466] [2020-08-21 14:16:05,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 14:16:05,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:16:05,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 14:16:05,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 14:16:05,257 INFO L87 Difference]: Start difference. First operand 127 states and 166 transitions. Second operand 43 states. [2020-08-21 14:16:07,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:16:07,468 INFO L93 Difference]: Finished difference Result 135 states and 175 transitions. [2020-08-21 14:16:07,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 14:16:07,468 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 126 [2020-08-21 14:16:07,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:16:07,469 INFO L225 Difference]: With dead ends: 135 [2020-08-21 14:16:07,470 INFO L226 Difference]: Without dead ends: 130 [2020-08-21 14:16:07,470 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=87, Invalid=1805, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 14:16:07,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-21 14:16:07,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2020-08-21 14:16:07,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2020-08-21 14:16:07,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 170 transitions. [2020-08-21 14:16:07,482 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 170 transitions. Word has length 126 [2020-08-21 14:16:07,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:16:07,483 INFO L479 AbstractCegarLoop]: Abstraction has 130 states and 170 transitions. [2020-08-21 14:16:07,483 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 14:16:07,483 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 170 transitions. [2020-08-21 14:16:07,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-08-21 14:16:07,484 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:16:07,484 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:16:07,484 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 14:16:07,484 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:16:07,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:16:07,484 INFO L82 PathProgramCache]: Analyzing trace with hash 1493345097, now seen corresponding path program 39 times [2020-08-21 14:16:07,485 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:16:07,485 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1838855117] [2020-08-21 14:16:07,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:16:07,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:16:08,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:16:08,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:16:08,986 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 0 proven. 2340 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:16:08,986 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1838855117] [2020-08-21 14:16:08,987 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:16:08,987 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 14:16:08,987 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422792140] [2020-08-21 14:16:08,987 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 14:16:08,987 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:16:08,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 14:16:08,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1807, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 14:16:08,988 INFO L87 Difference]: Start difference. First operand 130 states and 170 transitions. Second operand 44 states. [2020-08-21 14:16:11,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:16:11,265 INFO L93 Difference]: Finished difference Result 138 states and 179 transitions. [2020-08-21 14:16:11,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 14:16:11,266 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 129 [2020-08-21 14:16:11,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:16:11,268 INFO L225 Difference]: With dead ends: 138 [2020-08-21 14:16:11,268 INFO L226 Difference]: Without dead ends: 133 [2020-08-21 14:16:11,270 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=89, Invalid=1891, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 14:16:11,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-08-21 14:16:11,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2020-08-21 14:16:11,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-08-21 14:16:11,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 174 transitions. [2020-08-21 14:16:11,282 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 174 transitions. Word has length 129 [2020-08-21 14:16:11,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:16:11,282 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 174 transitions. [2020-08-21 14:16:11,282 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 14:16:11,283 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 174 transitions. [2020-08-21 14:16:11,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2020-08-21 14:16:11,283 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:16:11,283 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:16:11,284 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 14:16:11,284 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:16:11,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:16:11,284 INFO L82 PathProgramCache]: Analyzing trace with hash 500148978, now seen corresponding path program 40 times [2020-08-21 14:16:11,284 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:16:11,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1306266647] [2020-08-21 14:16:11,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:16:11,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:16:12,699 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:16:12,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:16:12,724 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 0 proven. 2460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:16:12,725 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1306266647] [2020-08-21 14:16:12,725 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:16:12,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 14:16:12,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298952331] [2020-08-21 14:16:12,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 14:16:12,725 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:16:12,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 14:16:12,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1893, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 14:16:12,726 INFO L87 Difference]: Start difference. First operand 133 states and 174 transitions. Second operand 45 states.