/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SHALLOWEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 20:25:40,323 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 20:25:40,325 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 20:25:40,349 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 20:25:40,349 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 20:25:40,350 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 20:25:40,352 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 20:25:40,353 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 20:25:40,355 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 20:25:40,356 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 20:25:40,357 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 20:25:40,358 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 20:25:40,358 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 20:25:40,359 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 20:25:40,360 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 20:25:40,361 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 20:25:40,362 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 20:25:40,363 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 20:25:40,365 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 20:25:40,367 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 20:25:40,368 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 20:25:40,369 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 20:25:40,370 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 20:25:40,371 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 20:25:40,374 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 20:25:40,382 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 20:25:40,382 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 20:25:40,383 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 20:25:40,384 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 [2020-08-18 20:25:40,423 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 20:25:40,424 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 20:25:40,426 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 20:25:40,426 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 20:25:40,426 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 20:25:40,427 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 20:25:40,427 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 20:25:40,427 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 20:25:40,427 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 20:25:40,427 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 20:25:40,428 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 20:25:40,428 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 20:25:40,428 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 20:25:40,428 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 20:25:40,428 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 20:25:40,428 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 20:25:40,430 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 20:25:40,430 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 20:25:40,430 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 20:25:40,431 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 20:25:40,431 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 20:25:40,431 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 20:25:40,431 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 20:25:40,431 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 20:25:40,432 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 20:25:40,432 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 20:25:40,432 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 20:25:40,432 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 20:25:40,432 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 20:25:40,432 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST; [2020-08-18 20:25:40,783 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 20:25:40,795 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 20:25:40,799 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 20:25:40,800 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 20:25:40,801 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 20:25:40,801 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-18 20:25:40,865 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/120132f3d/0854c329b1fb433f80ce6644c0a14781/FLAG70363b6b0 [2020-08-18 20:25:41,279 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 20:25:41,280 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-18 20:25:41,286 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/120132f3d/0854c329b1fb433f80ce6644c0a14781/FLAG70363b6b0 [2020-08-18 20:25:41,659 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/120132f3d/0854c329b1fb433f80ce6644c0a14781 [2020-08-18 20:25:41,670 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 20:25:41,672 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 20:25:41,673 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 20:25:41,673 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 20:25:41,676 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 20:25:41,677 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:25:41" (1/1) ... [2020-08-18 20:25:41,680 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@66948a6c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:41, skipping insertion in model container [2020-08-18 20:25:41,681 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:25:41" (1/1) ... [2020-08-18 20:25:41,688 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 20:25:41,706 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 20:25:41,883 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:25:41,889 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 20:25:41,907 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:25:41,921 INFO L208 MainTranslator]: Completed translation [2020-08-18 20:25:41,922 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:41 WrapperNode [2020-08-18 20:25:41,922 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 20:25:41,923 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 20:25:41,923 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 20:25:41,923 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 20:25:41,933 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:41" (1/1) ... [2020-08-18 20:25:41,933 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:41" (1/1) ... [2020-08-18 20:25:41,937 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:41" (1/1) ... [2020-08-18 20:25:41,938 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:41" (1/1) ... [2020-08-18 20:25:42,013 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:41" (1/1) ... [2020-08-18 20:25:42,020 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:41" (1/1) ... [2020-08-18 20:25:42,021 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:41" (1/1) ... [2020-08-18 20:25:42,022 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 20:25:42,023 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 20:25:42,023 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 20:25:42,023 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 20:25:42,024 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:41" (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 [2020-08-18 20:25:42,096 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 20:25:42,097 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 20:25:42,097 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 20:25:42,097 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 20:25:42,097 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 20:25:42,097 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 20:25:42,097 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 20:25:42,098 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 20:25:42,098 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 20:25:42,261 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 20:25:42,262 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 20:25:42,265 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:25:42 BoogieIcfgContainer [2020-08-18 20:25:42,265 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 20:25:42,267 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 20:25:42,267 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 20:25:42,270 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 20:25:42,270 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 08:25:41" (1/3) ... [2020-08-18 20:25:42,271 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32098dca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:25:42, skipping insertion in model container [2020-08-18 20:25:42,271 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:41" (2/3) ... [2020-08-18 20:25:42,272 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32098dca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:25:42, skipping insertion in model container [2020-08-18 20:25:42,272 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:25:42" (3/3) ... [2020-08-18 20:25:42,274 INFO L109 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2020-08-18 20:25:42,284 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 20:25:42,291 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 20:25:42,302 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 20:25:42,323 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 20:25:42,324 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 20:25:42,324 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 20:25:42,324 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 20:25:42,324 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 20:25:42,324 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 20:25:42,325 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 20:25:42,325 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 20:25:42,342 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-18 20:25:42,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 20:25:42,348 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:42,349 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:42,350 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:42,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:42,356 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-18 20:25:42,363 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:42,364 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1977683459] [2020-08-18 20:25:42,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:42,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:42,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:42,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:42,564 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:42,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1977683459] [2020-08-18 20:25:42,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:25:42,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 20:25:42,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824428096] [2020-08-18 20:25:42,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 20:25:42,603 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:42,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 20:25:42,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 20:25:42,637 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-18 20:25:42,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:42,673 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-18 20:25:42,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 20:25:42,675 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-18 20:25:42,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:42,683 INFO L225 Difference]: With dead ends: 29 [2020-08-18 20:25:42,683 INFO L226 Difference]: Without dead ends: 12 [2020-08-18 20:25:42,687 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 20:25:42,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-18 20:25:42,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-18 20:25:42,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-18 20:25:42,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-18 20:25:42,721 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-18 20:25:42,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:42,722 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-18 20:25:42,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 20:25:42,722 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-18 20:25:42,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-18 20:25:42,723 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:42,723 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:42,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 20:25:42,724 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:42,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:42,725 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-18 20:25:42,725 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:42,725 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1195393128] [2020-08-18 20:25:42,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:42,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:42,814 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:42,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:42,818 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:42,819 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1195393128] [2020-08-18 20:25:42,819 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:42,819 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 20:25:42,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113010109] [2020-08-18 20:25:42,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 20:25:42,822 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:42,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 20:25:42,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 20:25:42,823 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-18 20:25:42,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:42,843 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-18 20:25:42,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 20:25:42,844 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-18 20:25:42,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:42,845 INFO L225 Difference]: With dead ends: 18 [2020-08-18 20:25:42,845 INFO L226 Difference]: Without dead ends: 13 [2020-08-18 20:25:42,847 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 20:25:42,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-18 20:25:42,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-18 20:25:42,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 20:25:42,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-18 20:25:42,854 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-18 20:25:42,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:42,854 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-18 20:25:42,854 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 20:25:42,856 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-18 20:25:42,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 20:25:42,857 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:42,858 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:42,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 20:25:42,858 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:42,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:42,860 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-18 20:25:42,861 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:42,862 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1265308721] [2020-08-18 20:25:42,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:42,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:42,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:42,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:42,994 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:42,994 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1265308721] [2020-08-18 20:25:42,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:42,995 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 20:25:42,995 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169007755] [2020-08-18 20:25:42,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 20:25:42,996 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:42,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 20:25:42,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 20:25:42,997 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-18 20:25:43,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:43,030 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-18 20:25:43,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 20:25:43,031 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-18 20:25:43,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:43,032 INFO L225 Difference]: With dead ends: 19 [2020-08-18 20:25:43,032 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 20:25:43,033 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 20:25:43,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 20:25:43,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 20:25:43,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 20:25:43,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-18 20:25:43,040 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-18 20:25:43,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:43,041 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-18 20:25:43,041 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 20:25:43,041 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-18 20:25:43,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 20:25:43,042 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:43,042 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:43,042 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 20:25:43,043 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:43,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:43,043 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-18 20:25:43,043 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:43,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1194498802] [2020-08-18 20:25:43,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:43,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:43,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:43,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:43,152 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:43,153 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1194498802] [2020-08-18 20:25:43,153 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:43,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 20:25:43,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [11467488] [2020-08-18 20:25:43,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 20:25:43,154 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:43,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 20:25:43,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:25:43,155 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-18 20:25:43,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:43,186 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-18 20:25:43,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 20:25:43,186 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-18 20:25:43,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:43,187 INFO L225 Difference]: With dead ends: 20 [2020-08-18 20:25:43,188 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 20:25:43,188 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:25:43,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 20:25:43,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 20:25:43,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 20:25:43,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-18 20:25:43,194 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-18 20:25:43,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:43,194 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-18 20:25:43,194 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 20:25:43,195 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-18 20:25:43,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 20:25:43,195 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:43,195 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:43,196 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 20:25:43,196 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:43,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:43,196 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-18 20:25:43,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:43,197 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1268087051] [2020-08-18 20:25:43,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:43,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:43,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:43,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:43,306 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:43,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1268087051] [2020-08-18 20:25:43,307 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:43,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 20:25:43,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62068455] [2020-08-18 20:25:43,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 20:25:43,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:43,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 20:25:43,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 20:25:43,310 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-18 20:25:43,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:43,349 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-18 20:25:43,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 20:25:43,350 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-18 20:25:43,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:43,350 INFO L225 Difference]: With dead ends: 21 [2020-08-18 20:25:43,351 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 20:25:43,351 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 20:25:43,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 20:25:43,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 20:25:43,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 20:25:43,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-18 20:25:43,357 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-18 20:25:43,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:43,358 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-18 20:25:43,358 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 20:25:43,358 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-18 20:25:43,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 20:25:43,359 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:43,359 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:43,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 20:25:43,360 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:43,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:43,360 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-18 20:25:43,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:43,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1907190742] [2020-08-18 20:25:43,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:43,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:43,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:43,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:43,519 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:43,519 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1907190742] [2020-08-18 20:25:43,519 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:43,520 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 20:25:43,520 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558043240] [2020-08-18 20:25:43,520 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 20:25:43,521 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:43,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 20:25:43,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 20:25:43,521 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-18 20:25:43,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:43,567 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-18 20:25:43,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 20:25:43,568 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-18 20:25:43,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:43,569 INFO L225 Difference]: With dead ends: 22 [2020-08-18 20:25:43,569 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 20:25:43,570 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 20:25:43,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 20:25:43,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 20:25:43,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 20:25:43,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 20:25:43,575 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-18 20:25:43,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:43,576 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 20:25:43,576 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 20:25:43,576 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 20:25:43,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 20:25:43,577 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:43,577 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:43,577 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 20:25:43,577 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:43,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:43,578 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-18 20:25:43,578 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:43,578 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [976820698] [2020-08-18 20:25:43,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:43,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:43,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:43,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:43,718 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:43,718 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [976820698] [2020-08-18 20:25:43,719 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:43,719 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 20:25:43,719 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165648052] [2020-08-18 20:25:43,720 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 20:25:43,720 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:43,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 20:25:43,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 20:25:43,721 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-18 20:25:43,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:43,774 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-18 20:25:43,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 20:25:43,775 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-18 20:25:43,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:43,775 INFO L225 Difference]: With dead ends: 23 [2020-08-18 20:25:43,775 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 20:25:43,776 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 20:25:43,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 20:25:43,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 20:25:43,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 20:25:43,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-18 20:25:43,782 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-18 20:25:43,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:43,782 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-18 20:25:43,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 20:25:43,782 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-18 20:25:43,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 20:25:43,783 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:43,783 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:43,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 20:25:43,784 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:43,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:43,784 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-18 20:25:43,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:43,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1551258176] [2020-08-18 20:25:43,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:43,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:43,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:43,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:43,944 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:43,945 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1551258176] [2020-08-18 20:25:43,945 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:43,945 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 20:25:43,945 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32748653] [2020-08-18 20:25:43,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 20:25:43,946 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:43,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 20:25:43,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 20:25:43,947 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-18 20:25:44,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:44,005 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-18 20:25:44,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 20:25:44,005 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-18 20:25:44,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:44,006 INFO L225 Difference]: With dead ends: 24 [2020-08-18 20:25:44,006 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 20:25:44,007 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 20:25:44,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 20:25:44,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 20:25:44,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 20:25:44,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-18 20:25:44,012 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-18 20:25:44,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:44,013 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-18 20:25:44,013 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 20:25:44,013 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-18 20:25:44,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 20:25:44,014 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:44,014 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:44,014 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 20:25:44,014 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:44,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:44,015 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-18 20:25:44,015 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:44,016 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1708754205] [2020-08-18 20:25:44,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:44,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:44,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:44,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:44,193 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:44,193 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1708754205] [2020-08-18 20:25:44,194 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:44,194 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 20:25:44,194 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1949916310] [2020-08-18 20:25:44,194 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 20:25:44,195 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:44,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 20:25:44,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-18 20:25:44,195 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-18 20:25:44,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:44,287 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-18 20:25:44,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 20:25:44,288 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-18 20:25:44,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:44,289 INFO L225 Difference]: With dead ends: 25 [2020-08-18 20:25:44,289 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 20:25:44,290 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-18 20:25:44,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 20:25:44,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 20:25:44,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 20:25:44,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-18 20:25:44,295 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-18 20:25:44,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:44,296 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-18 20:25:44,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 20:25:44,296 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-18 20:25:44,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 20:25:44,297 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:44,297 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:44,297 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 20:25:44,297 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:44,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:44,298 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-18 20:25:44,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:44,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1565506374] [2020-08-18 20:25:44,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:44,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:44,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:44,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:44,512 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:44,512 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1565506374] [2020-08-18 20:25:44,513 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:44,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 20:25:44,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618902648] [2020-08-18 20:25:44,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 20:25:44,514 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:44,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 20:25:44,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-18 20:25:44,515 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-18 20:25:44,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:44,601 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 20:25:44,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 20:25:44,602 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-18 20:25:44,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:44,603 INFO L225 Difference]: With dead ends: 26 [2020-08-18 20:25:44,603 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 20:25:44,604 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-18 20:25:44,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 20:25:44,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 20:25:44,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 20:25:44,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-18 20:25:44,609 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-18 20:25:44,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:44,610 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-18 20:25:44,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 20:25:44,610 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-18 20:25:44,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 20:25:44,611 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:44,611 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:44,611 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 20:25:44,611 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:44,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:44,612 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-18 20:25:44,612 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:44,613 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1956176211] [2020-08-18 20:25:44,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:44,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:44,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:44,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:44,810 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:44,811 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1956176211] [2020-08-18 20:25:44,811 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:44,811 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 20:25:44,812 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283352053] [2020-08-18 20:25:44,812 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 20:25:44,812 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:44,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 20:25:44,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 20:25:44,813 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-18 20:25:44,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:44,906 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-18 20:25:44,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 20:25:44,907 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-18 20:25:44,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:44,907 INFO L225 Difference]: With dead ends: 27 [2020-08-18 20:25:44,908 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 20:25:44,908 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 20:25:44,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 20:25:44,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-18 20:25:44,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 20:25:44,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-18 20:25:44,913 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-18 20:25:44,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:44,914 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-18 20:25:44,914 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 20:25:44,914 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-18 20:25:44,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 20:25:44,914 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:44,915 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:44,915 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 20:25:44,915 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:44,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:44,915 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-18 20:25:44,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:44,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [978584440] [2020-08-18 20:25:44,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:44,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:45,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:45,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:45,112 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:45,112 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [978584440] [2020-08-18 20:25:45,113 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:45,113 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 20:25:45,113 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468889684] [2020-08-18 20:25:45,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 20:25:45,114 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:45,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 20:25:45,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-18 20:25:45,114 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-18 20:25:45,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:45,216 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-18 20:25:45,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 20:25:45,216 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-18 20:25:45,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:45,217 INFO L225 Difference]: With dead ends: 28 [2020-08-18 20:25:45,217 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 20:25:45,218 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-18 20:25:45,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 20:25:45,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-18 20:25:45,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 20:25:45,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 20:25:45,223 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-18 20:25:45,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:45,223 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 20:25:45,223 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 20:25:45,223 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 20:25:45,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 20:25:45,224 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:45,224 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:45,224 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 20:25:45,224 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:45,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:45,225 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-18 20:25:45,225 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:45,225 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [401762869] [2020-08-18 20:25:45,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:45,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:45,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:45,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:45,439 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:45,439 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [401762869] [2020-08-18 20:25:45,439 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:45,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 20:25:45,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481728983] [2020-08-18 20:25:45,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 20:25:45,440 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:45,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 20:25:45,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-18 20:25:45,441 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-18 20:25:45,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:45,556 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-18 20:25:45,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 20:25:45,557 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-18 20:25:45,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:45,557 INFO L225 Difference]: With dead ends: 29 [2020-08-18 20:25:45,557 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 20:25:45,558 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-18 20:25:45,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 20:25:45,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-18 20:25:45,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 20:25:45,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-18 20:25:45,570 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-18 20:25:45,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:45,571 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-18 20:25:45,571 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 20:25:45,571 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-18 20:25:45,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 20:25:45,572 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:45,572 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:45,572 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 20:25:45,572 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:45,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:45,573 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-18 20:25:45,573 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:45,573 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [358160227] [2020-08-18 20:25:45,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:45,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:45,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:45,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:45,827 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:45,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [358160227] [2020-08-18 20:25:45,827 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:45,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 20:25:45,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552815335] [2020-08-18 20:25:45,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 20:25:45,828 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:45,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 20:25:45,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 20:25:45,830 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-18 20:25:45,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:45,972 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-18 20:25:45,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 20:25:45,972 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-18 20:25:45,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:45,973 INFO L225 Difference]: With dead ends: 30 [2020-08-18 20:25:45,973 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 20:25:45,974 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 20:25:45,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 20:25:45,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 20:25:45,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 20:25:45,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-18 20:25:45,980 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-18 20:25:45,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:45,981 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-18 20:25:45,981 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 20:25:45,981 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-18 20:25:45,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 20:25:45,985 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:45,985 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:45,985 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 20:25:45,986 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:45,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:45,986 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-18 20:25:45,986 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:45,986 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1979604374] [2020-08-18 20:25:45,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:46,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:46,280 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:46,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:46,283 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:46,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1979604374] [2020-08-18 20:25:46,283 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:46,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 20:25:46,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755392235] [2020-08-18 20:25:46,284 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 20:25:46,284 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:46,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 20:25:46,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-18 20:25:46,285 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-18 20:25:46,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:46,441 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-18 20:25:46,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 20:25:46,442 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-18 20:25:46,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:46,442 INFO L225 Difference]: With dead ends: 31 [2020-08-18 20:25:46,442 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 20:25:46,443 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-18 20:25:46,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 20:25:46,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-18 20:25:46,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 20:25:46,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-18 20:25:46,448 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-18 20:25:46,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:46,448 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-18 20:25:46,448 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 20:25:46,448 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-18 20:25:46,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 20:25:46,449 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:46,449 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:46,449 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 20:25:46,450 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:46,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:46,450 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-18 20:25:46,450 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:46,451 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1842248592] [2020-08-18 20:25:46,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:46,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:46,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:46,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:46,720 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:46,721 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1842248592] [2020-08-18 20:25:46,721 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:46,721 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 20:25:46,721 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324728803] [2020-08-18 20:25:46,722 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 20:25:46,722 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:46,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 20:25:46,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-18 20:25:46,723 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-18 20:25:46,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:46,903 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 20:25:46,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 20:25:46,903 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-18 20:25:46,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:46,904 INFO L225 Difference]: With dead ends: 32 [2020-08-18 20:25:46,904 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 20:25:46,905 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-18 20:25:46,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 20:25:46,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-18 20:25:46,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 20:25:46,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-18 20:25:46,909 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-18 20:25:46,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:46,909 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-18 20:25:46,909 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 20:25:46,909 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-18 20:25:46,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 20:25:46,910 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:46,910 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:46,910 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 20:25:46,910 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:46,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:46,911 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-18 20:25:46,911 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:46,911 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1880744046] [2020-08-18 20:25:46,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:46,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:47,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:47,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:47,199 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:47,200 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1880744046] [2020-08-18 20:25:47,200 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:47,200 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 20:25:47,200 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883922750] [2020-08-18 20:25:47,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 20:25:47,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:47,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 20:25:47,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-18 20:25:47,202 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-18 20:25:47,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:47,413 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-18 20:25:47,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 20:25:47,414 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-18 20:25:47,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:47,415 INFO L225 Difference]: With dead ends: 33 [2020-08-18 20:25:47,415 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 20:25:47,416 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-18 20:25:47,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 20:25:47,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-18 20:25:47,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 20:25:47,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-18 20:25:47,421 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-18 20:25:47,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:47,421 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-18 20:25:47,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 20:25:47,421 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-18 20:25:47,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 20:25:47,422 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:47,422 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:47,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 20:25:47,423 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:47,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:47,423 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-18 20:25:47,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:47,423 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1251143409] [2020-08-18 20:25:47,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:47,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:47,776 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:47,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:47,779 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:47,779 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1251143409] [2020-08-18 20:25:47,779 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:47,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 20:25:47,780 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86379375] [2020-08-18 20:25:47,780 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 20:25:47,780 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:47,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 20:25:47,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 20:25:47,781 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-18 20:25:48,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:48,017 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-18 20:25:48,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 20:25:48,018 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-18 20:25:48,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:48,019 INFO L225 Difference]: With dead ends: 34 [2020-08-18 20:25:48,019 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 20:25:48,020 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 20:25:48,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 20:25:48,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 20:25:48,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 20:25:48,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 20:25:48,025 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-18 20:25:48,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:48,025 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 20:25:48,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 20:25:48,025 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 20:25:48,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 20:25:48,026 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:48,026 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:48,026 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 20:25:48,026 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:48,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:48,027 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-18 20:25:48,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:48,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1974018456] [2020-08-18 20:25:48,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:48,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:48,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:48,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:48,404 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:48,405 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1974018456] [2020-08-18 20:25:48,405 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:48,405 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 20:25:48,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884881241] [2020-08-18 20:25:48,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 20:25:48,406 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:48,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 20:25:48,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-18 20:25:48,407 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-18 20:25:48,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:48,665 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-18 20:25:48,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 20:25:48,668 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-18 20:25:48,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:48,669 INFO L225 Difference]: With dead ends: 35 [2020-08-18 20:25:48,669 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 20:25:48,670 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-18 20:25:48,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 20:25:48,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-18 20:25:48,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 20:25:48,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-18 20:25:48,674 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-18 20:25:48,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:48,675 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-18 20:25:48,675 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 20:25:48,675 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-18 20:25:48,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 20:25:48,675 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:48,676 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:48,676 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 20:25:48,676 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:48,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:48,676 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-18 20:25:48,677 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:48,677 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [932337053] [2020-08-18 20:25:48,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:48,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:49,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:49,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:49,070 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:49,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [932337053] [2020-08-18 20:25:49,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:49,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 20:25:49,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118229681] [2020-08-18 20:25:49,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 20:25:49,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:49,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 20:25:49,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-18 20:25:49,073 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-18 20:25:49,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:49,325 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-18 20:25:49,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 20:25:49,325 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-18 20:25:49,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:49,326 INFO L225 Difference]: With dead ends: 36 [2020-08-18 20:25:49,326 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 20:25:49,327 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-18 20:25:49,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 20:25:49,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-18 20:25:49,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 20:25:49,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-18 20:25:49,333 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-18 20:25:49,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:49,334 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-18 20:25:49,334 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 20:25:49,334 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-18 20:25:49,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 20:25:49,337 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:49,337 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:49,337 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 20:25:49,337 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:49,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:49,338 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-18 20:25:49,338 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:49,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1153488610] [2020-08-18 20:25:49,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:49,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:49,785 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:49,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:49,788 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:49,789 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1153488610] [2020-08-18 20:25:49,789 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:49,789 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 20:25:49,790 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612758886] [2020-08-18 20:25:49,791 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 20:25:49,791 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:49,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 20:25:49,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 20:25:49,792 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-18 20:25:50,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:50,041 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-18 20:25:50,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 20:25:50,042 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-18 20:25:50,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:50,042 INFO L225 Difference]: With dead ends: 37 [2020-08-18 20:25:50,042 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 20:25:50,043 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 20:25:50,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 20:25:50,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-18 20:25:50,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 20:25:50,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-18 20:25:50,050 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-18 20:25:50,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:50,051 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-18 20:25:50,051 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 20:25:50,052 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-18 20:25:50,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 20:25:50,052 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:50,052 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:50,053 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 20:25:50,053 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:50,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:50,053 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-18 20:25:50,054 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:50,054 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1799914782] [2020-08-18 20:25:50,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:50,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:50,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:50,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:50,488 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:50,488 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1799914782] [2020-08-18 20:25:50,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:50,489 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 20:25:50,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378576432] [2020-08-18 20:25:50,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 20:25:50,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:50,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 20:25:50,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 20:25:50,491 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-18 20:25:50,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:50,795 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 20:25:50,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 20:25:50,798 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-18 20:25:50,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:50,798 INFO L225 Difference]: With dead ends: 38 [2020-08-18 20:25:50,798 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 20:25:50,799 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 20:25:50,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 20:25:50,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-18 20:25:50,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 20:25:50,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-18 20:25:50,803 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-18 20:25:50,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:50,803 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-18 20:25:50,804 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 20:25:50,804 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-18 20:25:50,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 20:25:50,804 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:50,804 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:50,804 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 20:25:50,805 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:50,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:50,805 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-18 20:25:50,805 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:50,805 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1792325987] [2020-08-18 20:25:50,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:50,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:51,290 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:51,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:51,295 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:51,295 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1792325987] [2020-08-18 20:25:51,295 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:51,295 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 20:25:51,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297491394] [2020-08-18 20:25:51,296 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 20:25:51,296 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:51,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 20:25:51,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 20:25:51,297 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-18 20:25:51,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:51,679 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-18 20:25:51,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 20:25:51,679 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-18 20:25:51,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:51,680 INFO L225 Difference]: With dead ends: 39 [2020-08-18 20:25:51,680 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 20:25:51,681 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 20:25:51,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 20:25:51,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 20:25:51,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 20:25:51,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-18 20:25:51,688 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-18 20:25:51,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:51,688 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-18 20:25:51,688 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 20:25:51,688 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-18 20:25:51,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 20:25:51,689 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:51,689 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:51,689 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 20:25:51,689 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:51,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:51,690 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-18 20:25:51,690 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:51,690 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1597975471] [2020-08-18 20:25:51,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:51,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:52,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:52,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:52,151 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:52,151 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1597975471] [2020-08-18 20:25:52,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:52,151 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 20:25:52,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414677985] [2020-08-18 20:25:52,152 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 20:25:52,152 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:52,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 20:25:52,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 20:25:52,153 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-18 20:25:52,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:52,496 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-18 20:25:52,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 20:25:52,496 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-18 20:25:52,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:52,497 INFO L225 Difference]: With dead ends: 40 [2020-08-18 20:25:52,497 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 20:25:52,498 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 20:25:52,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 20:25:52,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 20:25:52,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 20:25:52,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 20:25:52,503 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-18 20:25:52,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:52,503 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 20:25:52,503 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 20:25:52,503 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 20:25:52,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 20:25:52,504 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:52,504 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:52,505 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 20:25:52,507 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:52,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:52,507 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-18 20:25:52,507 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:52,508 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1227595052] [2020-08-18 20:25:52,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:52,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:53,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:53,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:53,061 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:53,061 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1227595052] [2020-08-18 20:25:53,062 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:53,062 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 20:25:53,062 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564409040] [2020-08-18 20:25:53,062 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 20:25:53,062 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:53,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 20:25:53,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 20:25:53,063 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-18 20:25:53,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:53,444 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-18 20:25:53,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 20:25:53,444 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-18 20:25:53,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:53,445 INFO L225 Difference]: With dead ends: 41 [2020-08-18 20:25:53,445 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 20:25:53,446 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 20:25:53,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 20:25:53,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-18 20:25:53,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 20:25:53,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-18 20:25:53,451 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-18 20:25:53,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:53,451 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-18 20:25:53,451 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 20:25:53,451 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-18 20:25:53,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 20:25:53,452 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:53,452 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:53,452 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 20:25:53,452 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:53,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:53,453 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-18 20:25:53,453 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:53,453 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [259908862] [2020-08-18 20:25:53,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:53,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:53,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:53,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:54,003 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:54,003 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [259908862] [2020-08-18 20:25:54,003 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:54,004 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 20:25:54,004 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805464274] [2020-08-18 20:25:54,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 20:25:54,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:54,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 20:25:54,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-18 20:25:54,005 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-18 20:25:54,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:54,423 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-18 20:25:54,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 20:25:54,424 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-18 20:25:54,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:54,424 INFO L225 Difference]: With dead ends: 42 [2020-08-18 20:25:54,424 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 20:25:54,425 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-18 20:25:54,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 20:25:54,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 20:25:54,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 20:25:54,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-18 20:25:54,430 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-18 20:25:54,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:54,430 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-18 20:25:54,430 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 20:25:54,430 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-18 20:25:54,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 20:25:54,431 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:54,431 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:54,431 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 20:25:54,432 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:54,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:54,432 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-18 20:25:54,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:54,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [391608773] [2020-08-18 20:25:54,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:54,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:55,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:55,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:55,009 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:55,010 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [391608773] [2020-08-18 20:25:55,010 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:55,010 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 20:25:55,010 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [530942744] [2020-08-18 20:25:55,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 20:25:55,011 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:55,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 20:25:55,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 20:25:55,011 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-18 20:25:55,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:55,490 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-18 20:25:55,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 20:25:55,490 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-18 20:25:55,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:55,491 INFO L225 Difference]: With dead ends: 43 [2020-08-18 20:25:55,491 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 20:25:55,492 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 20:25:55,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 20:25:55,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 20:25:55,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 20:25:55,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-18 20:25:55,497 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-18 20:25:55,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:55,498 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-18 20:25:55,498 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 20:25:55,498 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-18 20:25:55,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 20:25:55,499 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:55,499 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:55,499 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 20:25:55,499 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:55,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:55,500 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-18 20:25:55,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:55,500 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1829471379] [2020-08-18 20:25:55,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:55,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:56,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:56,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:56,167 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:56,167 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1829471379] [2020-08-18 20:25:56,167 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:56,167 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 20:25:56,167 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747973344] [2020-08-18 20:25:56,168 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 20:25:56,168 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:56,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 20:25:56,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 20:25:56,169 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-18 20:25:56,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:56,664 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 20:25:56,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 20:25:56,666 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-18 20:25:56,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:56,667 INFO L225 Difference]: With dead ends: 44 [2020-08-18 20:25:56,667 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 20:25:56,667 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 20:25:56,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 20:25:56,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 20:25:56,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 20:25:56,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-18 20:25:56,672 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-18 20:25:56,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:56,672 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-18 20:25:56,673 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 20:25:56,673 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-18 20:25:56,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 20:25:56,673 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:56,673 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:56,674 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 20:25:56,674 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:56,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:56,674 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-18 20:25:56,674 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:56,674 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1207661024] [2020-08-18 20:25:56,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:56,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:57,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:57,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:57,387 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:57,387 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1207661024] [2020-08-18 20:25:57,387 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:57,388 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 20:25:57,388 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552614269] [2020-08-18 20:25:57,388 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 20:25:57,388 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:57,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 20:25:57,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 20:25:57,389 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-18 20:25:57,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:57,942 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-18 20:25:57,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 20:25:57,942 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-18 20:25:57,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:57,943 INFO L225 Difference]: With dead ends: 45 [2020-08-18 20:25:57,943 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 20:25:57,944 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 20:25:57,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 20:25:57,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 20:25:57,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 20:25:57,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-18 20:25:57,951 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-18 20:25:57,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:57,951 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-18 20:25:57,951 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 20:25:57,951 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-18 20:25:57,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 20:25:57,952 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:57,952 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:57,952 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 20:25:57,952 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:57,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:57,953 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-18 20:25:57,953 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:57,953 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [967509242] [2020-08-18 20:25:57,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:57,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:58,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:58,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:58,672 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:25:58,672 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [967509242] [2020-08-18 20:25:58,673 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:58,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 20:25:58,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964242724] [2020-08-18 20:25:58,673 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 20:25:58,674 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:58,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 20:25:58,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 20:25:58,675 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-18 20:25:59,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:59,272 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-18 20:25:59,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 20:25:59,273 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-18 20:25:59,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:59,274 INFO L225 Difference]: With dead ends: 46 [2020-08-18 20:25:59,274 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 20:25:59,275 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 20:25:59,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 20:25:59,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 20:25:59,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 20:25:59,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 20:25:59,281 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-18 20:25:59,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:59,281 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 20:25:59,281 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 20:25:59,281 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 20:25:59,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 20:25:59,282 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:59,282 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:59,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 20:25:59,282 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:59,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:59,282 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-18 20:25:59,283 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:59,283 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1639277633] [2020-08-18 20:25:59,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:59,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:00,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:00,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:00,007 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:00,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1639277633] [2020-08-18 20:26:00,007 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:00,007 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 20:26:00,008 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594374413] [2020-08-18 20:26:00,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 20:26:00,008 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:00,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 20:26:00,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 20:26:00,009 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-18 20:26:00,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:00,650 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-18 20:26:00,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 20:26:00,651 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-18 20:26:00,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:00,652 INFO L225 Difference]: With dead ends: 47 [2020-08-18 20:26:00,652 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 20:26:00,653 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 20:26:00,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 20:26:00,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-18 20:26:00,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 20:26:00,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-18 20:26:00,657 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-18 20:26:00,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:00,658 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-18 20:26:00,658 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 20:26:00,658 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-18 20:26:00,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 20:26:00,658 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:00,658 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:00,659 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 20:26:00,659 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:00,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:00,659 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-18 20:26:00,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:00,659 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1328858172] [2020-08-18 20:26:00,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:00,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:01,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:01,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:01,489 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:01,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1328858172] [2020-08-18 20:26:01,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:01,489 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 20:26:01,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955652342] [2020-08-18 20:26:01,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 20:26:01,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:01,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 20:26:01,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 20:26:01,491 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-18 20:26:02,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:02,145 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-18 20:26:02,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 20:26:02,146 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-18 20:26:02,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:02,146 INFO L225 Difference]: With dead ends: 48 [2020-08-18 20:26:02,147 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 20:26:02,148 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 20:26:02,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 20:26:02,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 20:26:02,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 20:26:02,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-18 20:26:02,153 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-18 20:26:02,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:02,154 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-18 20:26:02,154 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 20:26:02,154 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-18 20:26:02,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 20:26:02,155 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:02,155 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:02,155 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 20:26:02,155 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:02,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:02,156 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-18 20:26:02,156 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:02,156 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1948904266] [2020-08-18 20:26:02,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:02,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:03,046 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:03,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:03,049 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:03,050 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1948904266] [2020-08-18 20:26:03,050 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:03,050 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 20:26:03,050 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278864521] [2020-08-18 20:26:03,050 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 20:26:03,051 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:03,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 20:26:03,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 20:26:03,051 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-18 20:26:03,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:03,765 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-18 20:26:03,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 20:26:03,766 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-18 20:26:03,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:03,767 INFO L225 Difference]: With dead ends: 49 [2020-08-18 20:26:03,767 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 20:26:03,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 20:26:03,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 20:26:03,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 20:26:03,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 20:26:03,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-18 20:26:03,773 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-18 20:26:03,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:03,773 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-18 20:26:03,773 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 20:26:03,774 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-18 20:26:03,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 20:26:03,774 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:03,774 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:03,774 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 20:26:03,774 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:03,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:03,775 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-18 20:26:03,775 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:03,775 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [335930686] [2020-08-18 20:26:03,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:03,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:04,703 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:04,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:04,708 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:04,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [335930686] [2020-08-18 20:26:04,709 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:04,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 20:26:04,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534055717] [2020-08-18 20:26:04,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 20:26:04,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:04,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 20:26:04,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 20:26:04,710 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-18 20:26:05,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:05,478 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 20:26:05,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 20:26:05,479 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-18 20:26:05,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:05,480 INFO L225 Difference]: With dead ends: 50 [2020-08-18 20:26:05,480 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 20:26:05,481 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 20:26:05,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 20:26:05,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-18 20:26:05,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 20:26:05,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-18 20:26:05,484 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-18 20:26:05,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:05,484 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-18 20:26:05,485 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 20:26:05,485 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-18 20:26:05,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 20:26:05,485 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:05,485 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:05,485 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 20:26:05,486 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:05,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:05,486 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-18 20:26:05,486 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:05,486 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [180796985] [2020-08-18 20:26:05,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:05,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:06,413 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:06,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:06,418 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:06,418 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [180796985] [2020-08-18 20:26:06,419 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:06,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 20:26:06,419 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778003389] [2020-08-18 20:26:06,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 20:26:06,420 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:06,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 20:26:06,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 20:26:06,420 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-18 20:26:07,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:07,218 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-18 20:26:07,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 20:26:07,219 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-18 20:26:07,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:07,219 INFO L225 Difference]: With dead ends: 51 [2020-08-18 20:26:07,220 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 20:26:07,221 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 20:26:07,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 20:26:07,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 20:26:07,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 20:26:07,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-18 20:26:07,226 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-18 20:26:07,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:07,226 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-18 20:26:07,226 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 20:26:07,226 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-18 20:26:07,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 20:26:07,227 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:07,227 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:07,227 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 20:26:07,227 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:07,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:07,227 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-18 20:26:07,228 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:07,228 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2070376776] [2020-08-18 20:26:07,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:07,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:08,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:08,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:08,247 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:08,248 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2070376776] [2020-08-18 20:26:08,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:08,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 20:26:08,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2096519963] [2020-08-18 20:26:08,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 20:26:08,248 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:08,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 20:26:08,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 20:26:08,249 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-18 20:26:09,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:09,088 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-18 20:26:09,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 20:26:09,095 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-18 20:26:09,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:09,095 INFO L225 Difference]: With dead ends: 52 [2020-08-18 20:26:09,096 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 20:26:09,096 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 20:26:09,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 20:26:09,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 20:26:09,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 20:26:09,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 20:26:09,101 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-18 20:26:09,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:09,102 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 20:26:09,102 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 20:26:09,102 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 20:26:09,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 20:26:09,102 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:09,103 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:09,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 20:26:09,103 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:09,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:09,103 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-18 20:26:09,103 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:09,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1786466733] [2020-08-18 20:26:09,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:09,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:10,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:10,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:10,160 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:10,160 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1786466733] [2020-08-18 20:26:10,160 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:10,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 20:26:10,160 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722909152] [2020-08-18 20:26:10,161 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 20:26:10,161 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:10,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 20:26:10,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 20:26:10,162 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-18 20:26:11,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:11,087 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-18 20:26:11,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 20:26:11,090 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-18 20:26:11,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:11,090 INFO L225 Difference]: With dead ends: 53 [2020-08-18 20:26:11,090 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 20:26:11,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 20:26:11,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 20:26:11,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-18 20:26:11,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 20:26:11,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-18 20:26:11,094 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-18 20:26:11,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:11,095 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-18 20:26:11,095 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 20:26:11,095 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-18 20:26:11,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 20:26:11,095 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:11,095 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:11,096 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 20:26:11,096 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:11,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:11,096 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-18 20:26:11,096 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:11,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [175579752] [2020-08-18 20:26:11,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:11,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:12,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:12,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:12,215 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:12,215 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [175579752] [2020-08-18 20:26:12,215 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:12,215 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 20:26:12,215 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261487033] [2020-08-18 20:26:12,216 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 20:26:12,216 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:12,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 20:26:12,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 20:26:12,217 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-18 20:26:13,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:13,151 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-18 20:26:13,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 20:26:13,151 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-18 20:26:13,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:13,152 INFO L225 Difference]: With dead ends: 54 [2020-08-18 20:26:13,152 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 20:26:13,153 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 20:26:13,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 20:26:13,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 20:26:13,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 20:26:13,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-18 20:26:13,157 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-18 20:26:13,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:13,158 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-18 20:26:13,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 20:26:13,158 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-18 20:26:13,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 20:26:13,158 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:13,159 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:13,159 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 20:26:13,159 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:13,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:13,159 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-18 20:26:13,159 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:13,160 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [721011177] [2020-08-18 20:26:13,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:13,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:14,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:14,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:14,354 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:14,354 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [721011177] [2020-08-18 20:26:14,354 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:14,354 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 20:26:14,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162371839] [2020-08-18 20:26:14,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 20:26:14,355 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:14,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 20:26:14,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 20:26:14,355 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-18 20:26:15,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:15,384 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-18 20:26:15,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 20:26:15,384 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-18 20:26:15,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:15,385 INFO L225 Difference]: With dead ends: 55 [2020-08-18 20:26:15,385 INFO L226 Difference]: Without dead ends: 50 [2020-08-18 20:26:15,390 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 20:26:15,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-18 20:26:15,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-18 20:26:15,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-18 20:26:15,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-18 20:26:15,394 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-18 20:26:15,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:15,395 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-18 20:26:15,395 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 20:26:15,395 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-18 20:26:15,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 20:26:15,395 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:15,395 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:15,396 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 20:26:15,396 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:15,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:15,396 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-18 20:26:15,397 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:15,397 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [398142476] [2020-08-18 20:26:15,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:15,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:16,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:16,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:16,564 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:16,564 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [398142476] [2020-08-18 20:26:16,564 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:16,564 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 20:26:16,564 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782757805] [2020-08-18 20:26:16,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 20:26:16,565 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:16,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 20:26:16,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 20:26:16,566 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-18 20:26:17,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:17,613 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-18 20:26:17,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 20:26:17,619 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-18 20:26:17,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:17,620 INFO L225 Difference]: With dead ends: 56 [2020-08-18 20:26:17,620 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 20:26:17,621 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 20:26:17,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 20:26:17,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-18 20:26:17,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 20:26:17,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-18 20:26:17,625 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-18 20:26:17,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:17,626 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-18 20:26:17,626 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 20:26:17,626 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-18 20:26:17,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 20:26:17,626 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:17,627 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:17,627 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 20:26:17,627 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:17,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:17,627 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-18 20:26:17,628 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:17,628 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [424545918] [2020-08-18 20:26:17,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:17,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:19,106 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:19,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:19,117 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:19,117 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [424545918] [2020-08-18 20:26:19,118 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:19,118 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 20:26:19,118 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209083614] [2020-08-18 20:26:19,119 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 20:26:19,119 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:19,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 20:26:19,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 20:26:19,120 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-18 20:26:20,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:20,276 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-18 20:26:20,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 20:26:20,276 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-18 20:26:20,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:20,277 INFO L225 Difference]: With dead ends: 57 [2020-08-18 20:26:20,277 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 20:26:20,278 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 20:26:20,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 20:26:20,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-18 20:26:20,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 20:26:20,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-18 20:26:20,282 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-18 20:26:20,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:20,282 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-18 20:26:20,282 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 20:26:20,282 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-18 20:26:20,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 20:26:20,283 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:20,283 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:20,283 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 20:26:20,283 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:20,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:20,283 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-18 20:26:20,284 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:20,284 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1020937011] [2020-08-18 20:26:20,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:20,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:21,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:21,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:21,602 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:21,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1020937011] [2020-08-18 20:26:21,602 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:21,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 20:26:21,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464624767] [2020-08-18 20:26:21,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 20:26:21,603 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:21,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 20:26:21,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 20:26:21,604 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-18 20:26:22,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:22,786 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-18 20:26:22,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 20:26:22,787 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-18 20:26:22,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:22,788 INFO L225 Difference]: With dead ends: 58 [2020-08-18 20:26:22,788 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 20:26:22,789 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 20:26:22,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 20:26:22,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-18 20:26:22,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 20:26:22,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-18 20:26:22,793 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-18 20:26:22,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:22,793 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-18 20:26:22,793 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 20:26:22,793 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-18 20:26:22,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 20:26:22,794 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:22,794 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:22,794 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 20:26:22,794 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:22,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:22,795 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-18 20:26:22,795 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:22,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [422590562] [2020-08-18 20:26:22,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:22,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:24,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:24,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:24,242 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:24,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [422590562] [2020-08-18 20:26:24,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:24,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 20:26:24,243 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129376851] [2020-08-18 20:26:24,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 20:26:24,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:24,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 20:26:24,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 20:26:24,245 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-18 20:26:25,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:25,496 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-18 20:26:25,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 20:26:25,498 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-18 20:26:25,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:25,499 INFO L225 Difference]: With dead ends: 59 [2020-08-18 20:26:25,499 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 20:26:25,500 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 20:26:25,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 20:26:25,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-18 20:26:25,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 20:26:25,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-18 20:26:25,504 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-18 20:26:25,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:25,504 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-18 20:26:25,504 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 20:26:25,504 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-18 20:26:25,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-18 20:26:25,505 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:25,505 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:25,505 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-18 20:26:25,505 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:25,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:25,506 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-18 20:26:25,506 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:25,506 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [689619853] [2020-08-18 20:26:25,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:25,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:26,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:26,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:26,873 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:26,873 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [689619853] [2020-08-18 20:26:26,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:26,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-18 20:26:26,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44401526] [2020-08-18 20:26:26,874 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-18 20:26:26,874 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:26,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-18 20:26:26,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 20:26:26,875 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-18 20:26:28,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:28,166 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-18 20:26:28,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-18 20:26:28,167 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-18 20:26:28,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:28,168 INFO L225 Difference]: With dead ends: 60 [2020-08-18 20:26:28,168 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 20:26:28,169 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 20:26:28,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 20:26:28,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-18 20:26:28,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 20:26:28,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-18 20:26:28,173 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-18 20:26:28,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:28,173 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-18 20:26:28,173 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-18 20:26:28,173 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-18 20:26:28,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 20:26:28,173 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:28,173 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:28,173 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-18 20:26:28,174 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:28,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:28,174 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-18 20:26:28,174 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:28,174 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [429725171] [2020-08-18 20:26:28,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:28,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:29,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:29,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:29,675 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:29,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [429725171] [2020-08-18 20:26:29,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:29,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-18 20:26:29,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282450181] [2020-08-18 20:26:29,675 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-18 20:26:29,676 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:29,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-18 20:26:29,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 20:26:29,676 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-18 20:26:31,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:31,020 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-18 20:26:31,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-18 20:26:31,021 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-18 20:26:31,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:31,022 INFO L225 Difference]: With dead ends: 61 [2020-08-18 20:26:31,022 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 20:26:31,022 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 20:26:31,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 20:26:31,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-18 20:26:31,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-18 20:26:31,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-18 20:26:31,026 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-18 20:26:31,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:31,026 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-18 20:26:31,026 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-18 20:26:31,026 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-18 20:26:31,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 20:26:31,027 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:31,027 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:31,027 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-18 20:26:31,027 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:31,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:31,027 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-18 20:26:31,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:31,028 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1055336784] [2020-08-18 20:26:31,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:31,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:32,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:32,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:32,669 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:32,670 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1055336784] [2020-08-18 20:26:32,670 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:32,670 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-18 20:26:32,670 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758749025] [2020-08-18 20:26:32,671 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-18 20:26:32,671 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:32,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-18 20:26:32,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 20:26:32,672 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-18 20:26:34,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:34,056 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-18 20:26:34,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-18 20:26:34,057 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-18 20:26:34,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:34,058 INFO L225 Difference]: With dead ends: 62 [2020-08-18 20:26:34,058 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 20:26:34,058 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 20:26:34,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 20:26:34,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-18 20:26:34,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 20:26:34,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-18 20:26:34,063 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-18 20:26:34,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:34,064 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-18 20:26:34,064 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-18 20:26:34,064 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-18 20:26:34,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 20:26:34,065 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:34,065 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:34,065 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-18 20:26:34,065 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:34,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:34,065 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-18 20:26:34,066 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:34,066 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1526133187] [2020-08-18 20:26:34,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:34,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:35,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:35,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:35,730 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:35,730 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1526133187] [2020-08-18 20:26:35,730 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:35,730 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-18 20:26:35,730 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400486874] [2020-08-18 20:26:35,731 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-18 20:26:35,731 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:35,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-18 20:26:35,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 20:26:35,732 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-18 20:26:37,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:37,245 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-18 20:26:37,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-18 20:26:37,245 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-18 20:26:37,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:37,246 INFO L225 Difference]: With dead ends: 63 [2020-08-18 20:26:37,246 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 20:26:37,247 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 20:26:37,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 20:26:37,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-18 20:26:37,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 20:26:37,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-18 20:26:37,252 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-18 20:26:37,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:37,252 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-18 20:26:37,252 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-18 20:26:37,252 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-18 20:26:37,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 20:26:37,253 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:37,253 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:37,253 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-18 20:26:37,253 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:37,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:37,254 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-18 20:26:37,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:37,254 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [344868596] [2020-08-18 20:26:37,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:37,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:38,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:38,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:38,945 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:38,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [344868596] [2020-08-18 20:26:38,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:38,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-18 20:26:38,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704237744] [2020-08-18 20:26:38,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-18 20:26:38,947 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:38,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-18 20:26:38,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 20:26:38,947 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states. [2020-08-18 20:26:40,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:40,522 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-18 20:26:40,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-18 20:26:40,523 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 57 [2020-08-18 20:26:40,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:40,524 INFO L225 Difference]: With dead ends: 64 [2020-08-18 20:26:40,524 INFO L226 Difference]: Without dead ends: 59 [2020-08-18 20:26:40,524 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 20:26:40,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-18 20:26:40,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-18 20:26:40,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 20:26:40,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-18 20:26:40,530 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-08-18 20:26:40,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:40,530 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-18 20:26:40,530 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-18 20:26:40,531 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-18 20:26:40,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 20:26:40,531 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:40,531 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:40,531 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-18 20:26:40,532 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:40,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:40,532 INFO L82 PathProgramCache]: Analyzing trace with hash -809482178, now seen corresponding path program 48 times [2020-08-18 20:26:40,532 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:40,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1109825042] [2020-08-18 20:26:40,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:40,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat