/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=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=1.0 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 02:53:47,986 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 02:53:47,990 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 02:53:48,032 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 02:53:48,033 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 02:53:48,045 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 02:53:48,046 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 02:53:48,049 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 02:53:48,052 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 02:53:48,055 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 02:53:48,056 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 02:53:48,058 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 02:53:48,058 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 02:53:48,059 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 02:53:48,060 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 02:53:48,064 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 02:53:48,065 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 02:53:48,066 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 02:53:48,068 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 02:53:48,070 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 02:53:48,073 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 02:53:48,075 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 02:53:48,076 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 02:53:48,076 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 02:53:48,084 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 02:53:48,096 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 02:53:48,097 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 02:53:48,098 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 02:53:48,099 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-19 02:53:48,146 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 02:53:48,146 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 02:53:48,148 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 02:53:48,149 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 02:53:48,149 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 02:53:48,149 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 02:53:48,149 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 02:53:48,150 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 02:53:48,150 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 02:53:48,150 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 02:53:48,151 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 02:53:48,151 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 02:53:48,152 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 02:53:48,152 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 02:53:48,152 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 02:53:48,152 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 02:53:48,153 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 02:53:48,153 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 02:53:48,153 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 02:53:48,153 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 02:53:48,154 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 02:53:48,154 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 02:53:48,154 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 02:53:48,154 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 02:53:48,154 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 02:53:48,155 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 02:53:48,155 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 02:53:48,155 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 02:53:48,155 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 02:53:48,155 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=WIDESTAMONGSMALL;tolerance=1.0; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0; [2020-08-19 02:53:48,439 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 02:53:48,459 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 02:53:48,463 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 02:53:48,465 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 02:53:48,465 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 02:53:48,466 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-19 02:53:48,541 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/fb163f106/6f988574f21549ac9af9869a65314a79/FLAGd5dec8e01 [2020-08-19 02:53:49,027 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 02:53:49,028 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-19 02:53:49,035 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/fb163f106/6f988574f21549ac9af9869a65314a79/FLAGd5dec8e01 [2020-08-19 02:53:49,411 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/fb163f106/6f988574f21549ac9af9869a65314a79 [2020-08-19 02:53:49,423 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 02:53:49,425 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 02:53:49,429 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 02:53:49,429 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 02:53:49,433 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 02:53:49,434 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:53:49" (1/1) ... [2020-08-19 02:53:49,437 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@337988d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:49, skipping insertion in model container [2020-08-19 02:53:49,437 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:53:49" (1/1) ... [2020-08-19 02:53:49,445 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 02:53:49,463 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 02:53:49,626 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:53:49,631 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 02:53:49,645 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:53:49,657 INFO L208 MainTranslator]: Completed translation [2020-08-19 02:53:49,657 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:49 WrapperNode [2020-08-19 02:53:49,657 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 02:53:49,658 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 02:53:49,658 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 02:53:49,659 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 02:53:49,669 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:49" (1/1) ... [2020-08-19 02:53:49,669 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:49" (1/1) ... [2020-08-19 02:53:49,756 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:49" (1/1) ... [2020-08-19 02:53:49,757 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:49" (1/1) ... [2020-08-19 02:53:49,760 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:49" (1/1) ... [2020-08-19 02:53:49,767 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:49" (1/1) ... [2020-08-19 02:53:49,768 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:49" (1/1) ... [2020-08-19 02:53:49,769 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 02:53:49,769 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 02:53:49,770 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 02:53:49,770 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 02:53:49,770 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:49" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 02:53:49,827 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 02:53:49,827 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 02:53:49,827 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 02:53:49,828 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 02:53:49,828 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 02:53:49,828 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 02:53:49,828 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 02:53:49,828 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 02:53:49,828 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 02:53:49,984 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 02:53:49,984 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-19 02:53:49,987 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:53:49 BoogieIcfgContainer [2020-08-19 02:53:49,987 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 02:53:49,988 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 02:53:49,989 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 02:53:49,992 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 02:53:49,992 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 02:53:49" (1/3) ... [2020-08-19 02:53:49,993 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e2eb578 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:53:49, skipping insertion in model container [2020-08-19 02:53:49,993 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:53:49" (2/3) ... [2020-08-19 02:53:49,994 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e2eb578 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:53:49, skipping insertion in model container [2020-08-19 02:53:49,994 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:53:49" (3/3) ... [2020-08-19 02:53:49,995 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-08-19 02:53:50,006 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 02:53:50,014 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 02:53:50,028 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 02:53:50,053 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 02:53:50,053 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 02:53:50,053 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 02:53:50,054 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 02:53:50,054 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 02:53:50,054 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 02:53:50,054 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 02:53:50,054 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 02:53:50,073 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-19 02:53:50,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 02:53:50,078 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:50,079 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:50,079 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:50,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:50,084 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-19 02:53:50,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:50,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1916010296] [2020-08-19 02:53:50,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:50,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:50,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:50,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:50,297 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:50,298 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1916010296] [2020-08-19 02:53:50,300 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:53:50,301 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 02:53:50,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125293080] [2020-08-19 02:53:50,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 02:53:50,308 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:50,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 02:53:50,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 02:53:50,327 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-19 02:53:50,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:50,365 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-19 02:53:50,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 02:53:50,367 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-19 02:53:50,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:50,378 INFO L225 Difference]: With dead ends: 29 [2020-08-19 02:53:50,378 INFO L226 Difference]: Without dead ends: 12 [2020-08-19 02:53:50,383 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 02:53:50,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-19 02:53:50,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-19 02:53:50,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-19 02:53:50,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-19 02:53:50,436 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-19 02:53:50,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:50,436 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-19 02:53:50,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 02:53:50,437 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-19 02:53:50,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-19 02:53:50,438 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:50,438 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:50,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 02:53:50,439 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:50,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:50,440 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-19 02:53:50,440 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:50,441 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [754559531] [2020-08-19 02:53:50,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:50,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:50,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:50,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:50,525 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:50,526 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [754559531] [2020-08-19 02:53:50,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:50,526 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-19 02:53:50,527 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304928873] [2020-08-19 02:53:50,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 02:53:50,529 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:50,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 02:53:50,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 02:53:50,530 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-19 02:53:50,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:50,551 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-19 02:53:50,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 02:53:50,552 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-19 02:53:50,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:50,553 INFO L225 Difference]: With dead ends: 18 [2020-08-19 02:53:50,553 INFO L226 Difference]: Without dead ends: 13 [2020-08-19 02:53:50,554 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 [2020-08-19 02:53:50,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-19 02:53:50,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-19 02:53:50,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-19 02:53:50,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-19 02:53:50,560 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-19 02:53:50,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:50,561 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-19 02:53:50,561 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 02:53:50,561 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-19 02:53:50,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 02:53:50,562 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:50,562 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:50,562 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 02:53:50,563 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:50,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:50,563 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-19 02:53:50,564 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:50,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1669971855] [2020-08-19 02:53:50,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:50,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:50,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:50,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:50,681 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:50,681 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1669971855] [2020-08-19 02:53:50,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:50,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 02:53:50,682 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661067412] [2020-08-19 02:53:50,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 02:53:50,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:50,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 02:53:50,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 02:53:50,684 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-19 02:53:50,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:50,715 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-19 02:53:50,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 02:53:50,716 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-19 02:53:50,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:50,717 INFO L225 Difference]: With dead ends: 19 [2020-08-19 02:53:50,717 INFO L226 Difference]: Without dead ends: 14 [2020-08-19 02:53:50,718 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 [2020-08-19 02:53:50,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-19 02:53:50,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-19 02:53:50,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-19 02:53:50,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-19 02:53:50,724 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-19 02:53:50,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:50,724 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-19 02:53:50,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 02:53:50,724 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-19 02:53:50,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 02:53:50,725 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:50,725 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:50,726 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 02:53:50,726 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:50,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:50,726 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-19 02:53:50,727 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:50,728 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1105209980] [2020-08-19 02:53:50,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:50,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:50,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:50,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:50,864 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:50,864 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1105209980] [2020-08-19 02:53:50,865 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:50,865 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 02:53:50,865 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983548524] [2020-08-19 02:53:50,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 02:53:50,868 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:50,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 02:53:50,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-19 02:53:50,869 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-19 02:53:50,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:50,893 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-19 02:53:50,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 02:53:50,894 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-19 02:53:50,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:50,895 INFO L225 Difference]: With dead ends: 20 [2020-08-19 02:53:50,895 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 02:53:50,896 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 [2020-08-19 02:53:50,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 02:53:50,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 02:53:50,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 02:53:50,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-19 02:53:50,901 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-19 02:53:50,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:50,901 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-19 02:53:50,901 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 02:53:50,901 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-19 02:53:50,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-19 02:53:50,902 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:50,902 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:50,902 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 02:53:50,903 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:50,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:50,903 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-19 02:53:50,903 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:50,903 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1939081646] [2020-08-19 02:53:50,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:50,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:51,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:51,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:51,014 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:51,014 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1939081646] [2020-08-19 02:53:51,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:51,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 02:53:51,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238665944] [2020-08-19 02:53:51,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 02:53:51,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:51,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 02:53:51,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-19 02:53:51,017 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-19 02:53:51,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:51,057 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-19 02:53:51,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 02:53:51,057 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-19 02:53:51,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:51,058 INFO L225 Difference]: With dead ends: 21 [2020-08-19 02:53:51,058 INFO L226 Difference]: Without dead ends: 16 [2020-08-19 02:53:51,059 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 [2020-08-19 02:53:51,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-19 02:53:51,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-19 02:53:51,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-19 02:53:51,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-19 02:53:51,065 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-19 02:53:51,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:51,066 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-19 02:53:51,066 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 02:53:51,066 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-19 02:53:51,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-19 02:53:51,067 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:51,067 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:51,067 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 02:53:51,067 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:51,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:51,068 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-19 02:53:51,068 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:51,069 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [427047408] [2020-08-19 02:53:51,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:51,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:51,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:51,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:51,248 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:51,248 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [427047408] [2020-08-19 02:53:51,249 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:51,249 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 02:53:51,249 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381998390] [2020-08-19 02:53:51,250 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 02:53:51,250 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:51,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 02:53:51,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-19 02:53:51,251 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-19 02:53:51,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:51,305 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-19 02:53:51,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 02:53:51,306 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-19 02:53:51,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:51,307 INFO L225 Difference]: With dead ends: 22 [2020-08-19 02:53:51,307 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 02:53:51,308 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 [2020-08-19 02:53:51,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 02:53:51,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 02:53:51,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 02:53:51,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-19 02:53:51,313 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-19 02:53:51,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:51,314 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-19 02:53:51,314 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 02:53:51,314 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-19 02:53:51,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 02:53:51,315 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:51,315 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:51,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 02:53:51,315 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:51,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:51,316 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-19 02:53:51,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:51,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [139052117] [2020-08-19 02:53:51,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:51,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:51,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:51,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:51,448 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:51,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [139052117] [2020-08-19 02:53:51,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:51,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 02:53:51,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882968691] [2020-08-19 02:53:51,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 02:53:51,450 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:51,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 02:53:51,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-19 02:53:51,452 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-19 02:53:51,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:51,532 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-19 02:53:51,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 02:53:51,534 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-19 02:53:51,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:51,535 INFO L225 Difference]: With dead ends: 23 [2020-08-19 02:53:51,535 INFO L226 Difference]: Without dead ends: 18 [2020-08-19 02:53:51,537 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 [2020-08-19 02:53:51,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-19 02:53:51,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-19 02:53:51,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-19 02:53:51,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-19 02:53:51,545 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-19 02:53:51,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:51,545 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-19 02:53:51,545 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 02:53:51,546 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-19 02:53:51,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-19 02:53:51,546 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:51,546 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:51,547 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 02:53:51,548 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:51,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:51,549 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-19 02:53:51,549 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:51,550 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [331632572] [2020-08-19 02:53:51,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:51,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:51,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:51,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:51,741 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:51,741 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [331632572] [2020-08-19 02:53:51,741 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:51,742 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 02:53:51,742 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375087067] [2020-08-19 02:53:51,742 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 02:53:51,743 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:51,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 02:53:51,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-19 02:53:51,743 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-19 02:53:51,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:51,797 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-19 02:53:51,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 02:53:51,797 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-19 02:53:51,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:51,798 INFO L225 Difference]: With dead ends: 24 [2020-08-19 02:53:51,798 INFO L226 Difference]: Without dead ends: 19 [2020-08-19 02:53:51,799 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 [2020-08-19 02:53:51,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-19 02:53:51,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-19 02:53:51,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-19 02:53:51,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-19 02:53:51,804 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-19 02:53:51,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:51,805 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-19 02:53:51,805 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 02:53:51,805 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-19 02:53:51,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-19 02:53:51,806 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:51,806 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:51,806 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 02:53:51,806 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:51,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:51,807 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-19 02:53:51,807 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:51,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1693130011] [2020-08-19 02:53:51,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:51,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:51,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:51,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:51,951 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:51,952 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1693130011] [2020-08-19 02:53:51,952 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:51,952 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 02:53:51,953 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113114009] [2020-08-19 02:53:51,953 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 02:53:51,953 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:51,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 02:53:51,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-19 02:53:51,954 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-19 02:53:52,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:52,032 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-19 02:53:52,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 02:53:52,033 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-19 02:53:52,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:52,034 INFO L225 Difference]: With dead ends: 25 [2020-08-19 02:53:52,034 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 02:53:52,035 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 [2020-08-19 02:53:52,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 02:53:52,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-19 02:53:52,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 02:53:52,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-19 02:53:52,041 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-19 02:53:52,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:52,041 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-19 02:53:52,041 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 02:53:52,041 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-19 02:53:52,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 02:53:52,042 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:52,042 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:52,042 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 02:53:52,043 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:52,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:52,043 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-19 02:53:52,043 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:52,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [411827251] [2020-08-19 02:53:52,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:52,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:52,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:52,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:52,238 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:52,239 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [411827251] [2020-08-19 02:53:52,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:52,239 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 02:53:52,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464561650] [2020-08-19 02:53:52,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 02:53:52,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:52,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 02:53:52,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-19 02:53:52,241 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-19 02:53:52,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:52,325 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-19 02:53:52,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 02:53:52,326 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-19 02:53:52,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:52,327 INFO L225 Difference]: With dead ends: 26 [2020-08-19 02:53:52,338 INFO L226 Difference]: Without dead ends: 21 [2020-08-19 02:53:52,339 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 [2020-08-19 02:53:52,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-19 02:53:52,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-19 02:53:52,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 02:53:52,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-19 02:53:52,344 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-19 02:53:52,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:52,345 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-19 02:53:52,345 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 02:53:52,345 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-19 02:53:52,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 02:53:52,346 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:52,346 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:52,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 02:53:52,346 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:52,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:52,347 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-19 02:53:52,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:52,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1913265205] [2020-08-19 02:53:52,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:52,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:52,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:52,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:52,559 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:52,561 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1913265205] [2020-08-19 02:53:52,561 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:52,561 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 02:53:52,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [993493466] [2020-08-19 02:53:52,562 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 02:53:52,562 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:52,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 02:53:52,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-19 02:53:52,563 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-19 02:53:52,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:52,680 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-19 02:53:52,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 02:53:52,683 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-19 02:53:52,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:52,684 INFO L225 Difference]: With dead ends: 27 [2020-08-19 02:53:52,684 INFO L226 Difference]: Without dead ends: 22 [2020-08-19 02:53:52,684 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 [2020-08-19 02:53:52,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-19 02:53:52,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-19 02:53:52,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-19 02:53:52,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-19 02:53:52,695 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-19 02:53:52,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:52,696 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-19 02:53:52,696 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 02:53:52,696 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-19 02:53:52,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-19 02:53:52,697 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:52,697 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:52,698 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 02:53:52,698 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:52,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:52,698 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-19 02:53:52,698 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:52,699 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1765063499] [2020-08-19 02:53:52,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:52,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:52,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:52,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:52,947 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:52,947 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1765063499] [2020-08-19 02:53:52,947 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:52,948 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 02:53:52,948 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270626166] [2020-08-19 02:53:52,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 02:53:52,949 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:52,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 02:53:52,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-19 02:53:52,951 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-19 02:53:53,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:53,061 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-19 02:53:53,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 02:53:53,062 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-19 02:53:53,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:53,063 INFO L225 Difference]: With dead ends: 28 [2020-08-19 02:53:53,063 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 02:53:53,064 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 [2020-08-19 02:53:53,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 02:53:53,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-19 02:53:53,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-19 02:53:53,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-19 02:53:53,076 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-19 02:53:53,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:53,076 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-19 02:53:53,076 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 02:53:53,076 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-19 02:53:53,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 02:53:53,077 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:53,077 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:53,080 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 02:53:53,080 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:53,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:53,080 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-19 02:53:53,081 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:53,081 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [895770105] [2020-08-19 02:53:53,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:53,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:53,340 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:53,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:53,344 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:53,344 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [895770105] [2020-08-19 02:53:53,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:53,345 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 02:53:53,345 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314518732] [2020-08-19 02:53:53,346 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 02:53:53,346 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:53,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 02:53:53,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-19 02:53:53,349 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-19 02:53:53,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:53,522 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-19 02:53:53,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 02:53:53,526 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-19 02:53:53,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:53,527 INFO L225 Difference]: With dead ends: 29 [2020-08-19 02:53:53,527 INFO L226 Difference]: Without dead ends: 24 [2020-08-19 02:53:53,528 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 [2020-08-19 02:53:53,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-19 02:53:53,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-19 02:53:53,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-19 02:53:53,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-19 02:53:53,534 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-19 02:53:53,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:53,534 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-19 02:53:53,535 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 02:53:53,536 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-19 02:53:53,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-19 02:53:53,537 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:53,537 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:53,537 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 02:53:53,538 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:53,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:53,538 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-19 02:53:53,538 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:53,542 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [392292751] [2020-08-19 02:53:53,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:53,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:53,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:53,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:53,808 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:53,809 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [392292751] [2020-08-19 02:53:53,809 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:53,809 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 02:53:53,809 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720979311] [2020-08-19 02:53:53,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 02:53:53,810 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:53,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 02:53:53,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-19 02:53:53,811 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-19 02:53:53,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:53,954 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-19 02:53:53,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 02:53:53,956 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-19 02:53:53,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:53,957 INFO L225 Difference]: With dead ends: 30 [2020-08-19 02:53:53,957 INFO L226 Difference]: Without dead ends: 25 [2020-08-19 02:53:53,958 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-19 02:53:53,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-19 02:53:53,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-19 02:53:53,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-19 02:53:53,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-19 02:53:53,966 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-19 02:53:53,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:53,968 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-19 02:53:53,968 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 02:53:53,968 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-19 02:53:53,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 02:53:53,970 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:53,970 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:53,971 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 02:53:53,971 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:53,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:53,971 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-19 02:53:53,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:53,971 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1437336696] [2020-08-19 02:53:53,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:53,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:54,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:54,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:54,207 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:54,208 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1437336696] [2020-08-19 02:53:54,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:54,208 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 02:53:54,208 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746407291] [2020-08-19 02:53:54,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 02:53:54,209 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:54,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 02:53:54,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-19 02:53:54,210 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-19 02:53:54,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:54,376 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-19 02:53:54,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 02:53:54,377 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-19 02:53:54,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:54,378 INFO L225 Difference]: With dead ends: 31 [2020-08-19 02:53:54,378 INFO L226 Difference]: Without dead ends: 26 [2020-08-19 02:53:54,378 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-19 02:53:54,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-19 02:53:54,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-19 02:53:54,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-19 02:53:54,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-19 02:53:54,389 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-19 02:53:54,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:54,390 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-19 02:53:54,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 02:53:54,390 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-19 02:53:54,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-19 02:53:54,391 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:54,391 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:54,391 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 02:53:54,392 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:54,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:54,393 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-19 02:53:54,393 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:54,394 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1126121162] [2020-08-19 02:53:54,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:54,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:54,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:54,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:54,699 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:54,699 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1126121162] [2020-08-19 02:53:54,699 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:54,700 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 02:53:54,702 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276533845] [2020-08-19 02:53:54,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 02:53:54,704 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:54,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 02:53:54,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-19 02:53:54,705 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-19 02:53:54,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:54,894 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-19 02:53:54,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 02:53:54,895 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-19 02:53:54,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:54,896 INFO L225 Difference]: With dead ends: 32 [2020-08-19 02:53:54,896 INFO L226 Difference]: Without dead ends: 27 [2020-08-19 02:53:54,897 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 [2020-08-19 02:53:54,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-19 02:53:54,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-19 02:53:54,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-19 02:53:54,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-19 02:53:54,903 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-19 02:53:54,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:54,904 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-19 02:53:54,904 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 02:53:54,904 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-19 02:53:54,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-19 02:53:54,907 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:54,907 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:54,907 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 02:53:54,908 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:54,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:54,908 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-19 02:53:54,908 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:54,908 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1298091159] [2020-08-19 02:53:54,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:54,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:55,226 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:55,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:55,230 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:55,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1298091159] [2020-08-19 02:53:55,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:55,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 02:53:55,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167494910] [2020-08-19 02:53:55,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 02:53:55,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:55,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 02:53:55,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-19 02:53:55,233 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-19 02:53:55,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:55,448 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-19 02:53:55,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 02:53:55,449 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-19 02:53:55,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:55,449 INFO L225 Difference]: With dead ends: 33 [2020-08-19 02:53:55,449 INFO L226 Difference]: Without dead ends: 28 [2020-08-19 02:53:55,450 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 [2020-08-19 02:53:55,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-19 02:53:55,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-19 02:53:55,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-19 02:53:55,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-19 02:53:55,455 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-19 02:53:55,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:55,455 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-19 02:53:55,455 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 02:53:55,455 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-19 02:53:55,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-19 02:53:55,456 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:55,456 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:55,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 02:53:55,457 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:55,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:55,457 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-19 02:53:55,457 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:55,457 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1427614469] [2020-08-19 02:53:55,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:55,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:55,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:55,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:55,782 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:55,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1427614469] [2020-08-19 02:53:55,783 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:55,783 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 02:53:55,783 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729979439] [2020-08-19 02:53:55,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 02:53:55,784 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:55,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 02:53:55,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-19 02:53:55,784 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-19 02:53:56,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:56,017 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-19 02:53:56,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 02:53:56,018 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-19 02:53:56,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:56,018 INFO L225 Difference]: With dead ends: 34 [2020-08-19 02:53:56,019 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 02:53:56,019 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-19 02:53:56,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 02:53:56,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-19 02:53:56,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 02:53:56,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-19 02:53:56,024 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-19 02:53:56,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:56,025 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-19 02:53:56,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 02:53:56,025 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-19 02:53:56,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 02:53:56,026 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:56,026 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:56,026 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 02:53:56,026 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:56,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:56,027 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-19 02:53:56,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:56,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [545647687] [2020-08-19 02:53:56,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:56,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:56,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:56,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:56,352 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:56,352 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [545647687] [2020-08-19 02:53:56,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:56,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 02:53:56,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990205153] [2020-08-19 02:53:56,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 02:53:56,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:56,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 02:53:56,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-19 02:53:56,354 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-19 02:53:56,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:56,591 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-19 02:53:56,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 02:53:56,592 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-19 02:53:56,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:56,592 INFO L225 Difference]: With dead ends: 35 [2020-08-19 02:53:56,593 INFO L226 Difference]: Without dead ends: 30 [2020-08-19 02:53:56,593 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-19 02:53:56,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-19 02:53:56,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-19 02:53:56,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-19 02:53:56,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-19 02:53:56,598 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-19 02:53:56,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:56,598 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-19 02:53:56,598 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 02:53:56,599 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-19 02:53:56,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-19 02:53:56,599 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:56,599 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:56,600 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 02:53:56,600 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:56,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:56,600 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-19 02:53:56,600 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:56,600 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [501122063] [2020-08-19 02:53:56,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:56,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:56,994 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:56,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:56,998 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:56,998 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [501122063] [2020-08-19 02:53:56,998 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:56,998 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 02:53:56,998 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672631805] [2020-08-19 02:53:56,999 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 02:53:56,999 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:56,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 02:53:56,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-19 02:53:56,999 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-19 02:53:57,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:57,292 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-19 02:53:57,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 02:53:57,295 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-19 02:53:57,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:57,296 INFO L225 Difference]: With dead ends: 36 [2020-08-19 02:53:57,296 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 02:53:57,297 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 [2020-08-19 02:53:57,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 02:53:57,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-19 02:53:57,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 02:53:57,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-19 02:53:57,301 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-19 02:53:57,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:57,302 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-19 02:53:57,302 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 02:53:57,302 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-19 02:53:57,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-19 02:53:57,303 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:57,303 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:57,303 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 02:53:57,303 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:57,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:57,304 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-19 02:53:57,304 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:57,304 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [569142525] [2020-08-19 02:53:57,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:57,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:57,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:57,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:57,760 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:57,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [569142525] [2020-08-19 02:53:57,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:57,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 02:53:57,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676389634] [2020-08-19 02:53:57,761 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 02:53:57,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:57,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 02:53:57,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-19 02:53:57,762 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-19 02:53:58,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:58,043 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-19 02:53:58,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 02:53:58,043 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-19 02:53:58,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:58,044 INFO L225 Difference]: With dead ends: 37 [2020-08-19 02:53:58,044 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 02:53:58,045 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-19 02:53:58,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 02:53:58,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-19 02:53:58,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-19 02:53:58,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-19 02:53:58,050 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-19 02:53:58,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:58,050 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-19 02:53:58,050 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 02:53:58,050 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-19 02:53:58,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-19 02:53:58,051 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:58,051 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:58,051 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 02:53:58,052 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:58,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:58,052 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-19 02:53:58,052 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:58,052 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [992687302] [2020-08-19 02:53:58,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:58,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:58,461 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:58,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:58,465 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:58,465 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [992687302] [2020-08-19 02:53:58,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:58,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 02:53:58,467 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368703665] [2020-08-19 02:53:58,467 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 02:53:58,467 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:58,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 02:53:58,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-19 02:53:58,469 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-19 02:53:58,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:58,783 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-19 02:53:58,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 02:53:58,786 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-19 02:53:58,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:58,787 INFO L225 Difference]: With dead ends: 38 [2020-08-19 02:53:58,787 INFO L226 Difference]: Without dead ends: 33 [2020-08-19 02:53:58,788 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 [2020-08-19 02:53:58,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-19 02:53:58,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-19 02:53:58,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 02:53:58,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-19 02:53:58,798 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-19 02:53:58,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:58,798 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-19 02:53:58,798 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 02:53:58,798 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-19 02:53:58,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 02:53:58,799 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:58,799 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:58,799 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 02:53:58,799 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:58,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:58,800 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-19 02:53:58,800 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:58,800 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [591285330] [2020-08-19 02:53:58,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:58,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:59,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:59,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:59,306 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:53:59,309 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [591285330] [2020-08-19 02:53:59,309 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:59,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 02:53:59,310 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158739519] [2020-08-19 02:53:59,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 02:53:59,310 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:59,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 02:53:59,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-19 02:53:59,311 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-19 02:53:59,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:59,620 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-19 02:53:59,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 02:53:59,620 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-19 02:53:59,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:59,621 INFO L225 Difference]: With dead ends: 39 [2020-08-19 02:53:59,621 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 02:53:59,622 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 [2020-08-19 02:53:59,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 02:53:59,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-19 02:53:59,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-19 02:53:59,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-19 02:53:59,634 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-19 02:53:59,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:59,635 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-19 02:53:59,635 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 02:53:59,635 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-19 02:53:59,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-19 02:53:59,636 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:59,636 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:53:59,636 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 02:53:59,636 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:59,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:59,637 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-19 02:53:59,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:59,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [856776485] [2020-08-19 02:53:59,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:59,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:00,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:00,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:00,218 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:00,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [856776485] [2020-08-19 02:54:00,218 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:00,219 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 02:54:00,219 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990627532] [2020-08-19 02:54:00,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 02:54:00,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:00,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 02:54:00,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-19 02:54:00,220 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-19 02:54:00,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:00,612 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-19 02:54:00,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 02:54:00,613 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-19 02:54:00,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:00,614 INFO L225 Difference]: With dead ends: 40 [2020-08-19 02:54:00,614 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 02:54:00,614 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-19 02:54:00,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 02:54:00,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-19 02:54:00,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 02:54:00,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-19 02:54:00,620 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-19 02:54:00,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:00,620 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-19 02:54:00,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 02:54:00,620 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-19 02:54:00,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 02:54:00,621 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:00,621 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:00,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 02:54:00,621 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:00,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:00,622 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-19 02:54:00,622 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:00,622 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [214190824] [2020-08-19 02:54:00,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:00,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:01,209 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:01,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:01,213 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:01,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [214190824] [2020-08-19 02:54:01,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:01,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 02:54:01,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278027907] [2020-08-19 02:54:01,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 02:54:01,214 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:01,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 02:54:01,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-19 02:54:01,215 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-19 02:54:01,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:01,575 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-19 02:54:01,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 02:54:01,575 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-19 02:54:01,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:01,576 INFO L225 Difference]: With dead ends: 41 [2020-08-19 02:54:01,576 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 02:54:01,577 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 [2020-08-19 02:54:01,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 02:54:01,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-19 02:54:01,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-19 02:54:01,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-19 02:54:01,583 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-19 02:54:01,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:01,584 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-19 02:54:01,584 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 02:54:01,584 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-19 02:54:01,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-19 02:54:01,584 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:01,585 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:01,585 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 02:54:01,585 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:01,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:01,587 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-19 02:54:01,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:01,588 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [678065642] [2020-08-19 02:54:01,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:01,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:02,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:02,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:02,182 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:02,183 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [678065642] [2020-08-19 02:54:02,183 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:02,183 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 02:54:02,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233867835] [2020-08-19 02:54:02,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 02:54:02,184 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:02,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 02:54:02,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-19 02:54:02,184 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-19 02:54:02,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:02,657 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-19 02:54:02,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 02:54:02,658 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-19 02:54:02,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:02,659 INFO L225 Difference]: With dead ends: 42 [2020-08-19 02:54:02,659 INFO L226 Difference]: Without dead ends: 37 [2020-08-19 02:54:02,660 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 [2020-08-19 02:54:02,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-19 02:54:02,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-19 02:54:02,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 02:54:02,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-19 02:54:02,665 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-19 02:54:02,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:02,665 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-19 02:54:02,665 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 02:54:02,665 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-19 02:54:02,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 02:54:02,666 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:02,666 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:02,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 02:54:02,666 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:02,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:02,667 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-19 02:54:02,667 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:02,667 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [814591304] [2020-08-19 02:54:02,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:02,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:03,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:03,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:03,268 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:03,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [814591304] [2020-08-19 02:54:03,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:03,269 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 02:54:03,269 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899051307] [2020-08-19 02:54:03,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 02:54:03,269 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:03,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 02:54:03,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-19 02:54:03,270 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-19 02:54:03,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:03,742 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-19 02:54:03,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 02:54:03,743 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-19 02:54:03,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:03,744 INFO L225 Difference]: With dead ends: 43 [2020-08-19 02:54:03,744 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 02:54:03,745 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 [2020-08-19 02:54:03,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 02:54:03,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-19 02:54:03,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-19 02:54:03,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-19 02:54:03,752 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-19 02:54:03,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:03,752 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-19 02:54:03,752 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 02:54:03,752 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-19 02:54:03,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 02:54:03,753 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:03,753 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:03,753 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 02:54:03,753 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:03,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:03,753 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-19 02:54:03,754 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:03,754 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1985765704] [2020-08-19 02:54:03,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:03,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:04,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:04,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:04,414 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:04,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1985765704] [2020-08-19 02:54:04,414 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:04,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 02:54:04,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53604024] [2020-08-19 02:54:04,415 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 02:54:04,415 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:04,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 02:54:04,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-19 02:54:04,416 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-19 02:54:04,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:04,927 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-19 02:54:04,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 02:54:04,927 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-19 02:54:04,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:04,928 INFO L225 Difference]: With dead ends: 44 [2020-08-19 02:54:04,928 INFO L226 Difference]: Without dead ends: 39 [2020-08-19 02:54:04,929 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 [2020-08-19 02:54:04,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-19 02:54:04,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-19 02:54:04,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 02:54:04,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-19 02:54:04,935 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-19 02:54:04,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:04,935 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-19 02:54:04,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 02:54:04,935 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-19 02:54:04,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 02:54:04,936 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:04,936 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:04,936 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 02:54:04,936 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:04,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:04,936 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-19 02:54:04,937 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:04,937 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1021277081] [2020-08-19 02:54:04,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:04,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:05,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:05,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:05,630 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:05,631 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1021277081] [2020-08-19 02:54:05,631 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:05,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 02:54:05,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016179369] [2020-08-19 02:54:05,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 02:54:05,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:05,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 02:54:05,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-19 02:54:05,633 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-19 02:54:06,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:06,209 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-19 02:54:06,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 02:54:06,210 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-19 02:54:06,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:06,210 INFO L225 Difference]: With dead ends: 45 [2020-08-19 02:54:06,211 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 02:54:06,211 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 [2020-08-19 02:54:06,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 02:54:06,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-19 02:54:06,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-19 02:54:06,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-19 02:54:06,215 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-19 02:54:06,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:06,215 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-19 02:54:06,215 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 02:54:06,216 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-19 02:54:06,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-19 02:54:06,216 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:06,216 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:06,216 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 02:54:06,217 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:06,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:06,217 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-19 02:54:06,217 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:06,217 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [774673542] [2020-08-19 02:54:06,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:06,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:06,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:06,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:06,942 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:06,942 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [774673542] [2020-08-19 02:54:06,943 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:06,943 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 02:54:06,943 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586819581] [2020-08-19 02:54:06,943 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 02:54:06,943 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:06,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 02:54:06,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-19 02:54:06,944 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-19 02:54:07,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:07,527 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-19 02:54:07,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 02:54:07,528 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-19 02:54:07,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:07,528 INFO L225 Difference]: With dead ends: 46 [2020-08-19 02:54:07,528 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 02:54:07,530 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 [2020-08-19 02:54:07,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 02:54:07,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-19 02:54:07,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 02:54:07,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-19 02:54:07,534 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-19 02:54:07,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:07,534 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-19 02:54:07,535 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 02:54:07,535 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-19 02:54:07,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 02:54:07,535 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:07,535 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:07,535 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 02:54:07,536 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:07,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:07,536 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-19 02:54:07,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:07,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1429571228] [2020-08-19 02:54:07,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:07,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:08,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:08,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:08,327 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:08,327 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1429571228] [2020-08-19 02:54:08,328 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:08,328 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 02:54:08,328 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806607419] [2020-08-19 02:54:08,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 02:54:08,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:08,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 02:54:08,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 02:54:08,329 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-19 02:54:08,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:08,949 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-19 02:54:08,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 02:54:08,950 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-19 02:54:08,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:08,951 INFO L225 Difference]: With dead ends: 47 [2020-08-19 02:54:08,951 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 02:54:08,952 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 02:54:08,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 02:54:08,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-19 02:54:08,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-19 02:54:08,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-19 02:54:08,956 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-19 02:54:08,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:08,957 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-19 02:54:08,957 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 02:54:08,957 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-19 02:54:08,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 02:54:08,957 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:08,957 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:08,958 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 02:54:08,958 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:08,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:08,958 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-19 02:54:08,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:08,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1313857109] [2020-08-19 02:54:08,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:08,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:09,782 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:09,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:09,791 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:09,791 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1313857109] [2020-08-19 02:54:09,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:09,792 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 02:54:09,792 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404220586] [2020-08-19 02:54:09,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 02:54:09,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:09,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 02:54:09,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 02:54:09,794 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-19 02:54:10,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:10,397 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-19 02:54:10,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 02:54:10,398 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-19 02:54:10,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:10,399 INFO L225 Difference]: With dead ends: 48 [2020-08-19 02:54:10,399 INFO L226 Difference]: Without dead ends: 43 [2020-08-19 02:54:10,400 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 [2020-08-19 02:54:10,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-19 02:54:10,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-19 02:54:10,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 02:54:10,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-19 02:54:10,403 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-19 02:54:10,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:10,404 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-19 02:54:10,404 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 02:54:10,404 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-19 02:54:10,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 02:54:10,404 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:10,405 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:10,405 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 02:54:10,405 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:10,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:10,405 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-19 02:54:10,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:10,406 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1607611790] [2020-08-19 02:54:10,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:10,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:11,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:11,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:11,289 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:11,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1607611790] [2020-08-19 02:54:11,290 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:11,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 02:54:11,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275892203] [2020-08-19 02:54:11,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 02:54:11,291 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:11,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 02:54:11,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 02:54:11,291 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-19 02:54:12,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:12,017 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-19 02:54:12,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 02:54:12,018 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-19 02:54:12,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:12,019 INFO L225 Difference]: With dead ends: 49 [2020-08-19 02:54:12,019 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 02:54:12,019 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 [2020-08-19 02:54:12,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 02:54:12,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-19 02:54:12,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 02:54:12,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-19 02:54:12,023 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-19 02:54:12,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:12,023 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-19 02:54:12,023 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 02:54:12,024 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-19 02:54:12,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 02:54:12,024 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:12,024 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:12,024 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 02:54:12,025 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:12,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:12,025 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-19 02:54:12,025 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:12,025 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [779286231] [2020-08-19 02:54:12,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:12,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:12,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:12,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:12,959 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:12,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [779286231] [2020-08-19 02:54:12,960 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:12,960 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 02:54:12,960 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983347536] [2020-08-19 02:54:12,960 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 02:54:12,961 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:12,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 02:54:12,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 02:54:12,961 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-19 02:54:13,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:13,713 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-19 02:54:13,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 02:54:13,714 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-19 02:54:13,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:13,714 INFO L225 Difference]: With dead ends: 50 [2020-08-19 02:54:13,715 INFO L226 Difference]: Without dead ends: 45 [2020-08-19 02:54:13,716 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 [2020-08-19 02:54:13,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-19 02:54:13,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-19 02:54:13,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-19 02:54:13,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-19 02:54:13,719 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-19 02:54:13,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:13,719 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-19 02:54:13,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 02:54:13,720 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-19 02:54:13,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 02:54:13,720 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:13,720 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:13,721 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 02:54:13,721 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:13,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:13,721 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-19 02:54:13,721 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:13,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [98419301] [2020-08-19 02:54:13,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:13,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:14,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:14,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:14,715 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:14,715 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [98419301] [2020-08-19 02:54:14,716 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:14,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 02:54:14,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782721967] [2020-08-19 02:54:14,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 02:54:14,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:14,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 02:54:14,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 02:54:14,719 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-19 02:54:15,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:15,528 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-19 02:54:15,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 02:54:15,529 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-19 02:54:15,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:15,530 INFO L225 Difference]: With dead ends: 51 [2020-08-19 02:54:15,530 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 02:54:15,531 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 02:54:15,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 02:54:15,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-19 02:54:15,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 02:54:15,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-19 02:54:15,534 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-19 02:54:15,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:15,534 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-19 02:54:15,535 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 02:54:15,535 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-19 02:54:15,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-19 02:54:15,535 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:15,535 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:15,536 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 02:54:15,536 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:15,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:15,536 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-19 02:54:15,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:15,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [621848557] [2020-08-19 02:54:15,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:15,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:16,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:16,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:16,588 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:16,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [621848557] [2020-08-19 02:54:16,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:16,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 02:54:16,589 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743618545] [2020-08-19 02:54:16,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 02:54:16,589 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:16,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 02:54:16,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 02:54:16,590 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-19 02:54:17,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:17,411 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-19 02:54:17,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 02:54:17,412 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-19 02:54:17,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:17,413 INFO L225 Difference]: With dead ends: 52 [2020-08-19 02:54:17,413 INFO L226 Difference]: Without dead ends: 47 [2020-08-19 02:54:17,413 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 02:54:17,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-19 02:54:17,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-19 02:54:17,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-19 02:54:17,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-19 02:54:17,417 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-19 02:54:17,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:17,417 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-19 02:54:17,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 02:54:17,418 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-19 02:54:17,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 02:54:17,418 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:17,418 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:17,418 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 02:54:17,418 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:17,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:17,419 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-19 02:54:17,419 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:17,419 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [618348071] [2020-08-19 02:54:17,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:17,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:18,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:18,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:18,515 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:18,515 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [618348071] [2020-08-19 02:54:18,515 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:18,516 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 02:54:18,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210005182] [2020-08-19 02:54:18,516 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 02:54:18,516 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:18,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 02:54:18,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 02:54:18,517 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-19 02:54:19,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:19,450 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-19 02:54:19,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 02:54:19,451 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-19 02:54:19,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:19,452 INFO L225 Difference]: With dead ends: 53 [2020-08-19 02:54:19,453 INFO L226 Difference]: Without dead ends: 48 [2020-08-19 02:54:19,454 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 [2020-08-19 02:54:19,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-19 02:54:19,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-19 02:54:19,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-19 02:54:19,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-19 02:54:19,458 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-19 02:54:19,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:19,458 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-19 02:54:19,458 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 02:54:19,458 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-19 02:54:19,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-19 02:54:19,459 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:19,459 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:19,459 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 02:54:19,459 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:19,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:19,460 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-19 02:54:19,460 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:19,460 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1825897838] [2020-08-19 02:54:19,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:19,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:20,573 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:20,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:20,578 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:20,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1825897838] [2020-08-19 02:54:20,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:20,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 02:54:20,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [716311190] [2020-08-19 02:54:20,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 02:54:20,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:20,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 02:54:20,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 02:54:20,580 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-19 02:54:21,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:21,535 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-19 02:54:21,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 02:54:21,536 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-19 02:54:21,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:21,537 INFO L225 Difference]: With dead ends: 54 [2020-08-19 02:54:21,537 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 02:54:21,538 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 [2020-08-19 02:54:21,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 02:54:21,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-19 02:54:21,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 02:54:21,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-19 02:54:21,542 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-19 02:54:21,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:21,543 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-19 02:54:21,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 02:54:21,543 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-19 02:54:21,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 02:54:21,543 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:21,543 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:21,544 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 02:54:21,544 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:21,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:21,544 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-19 02:54:21,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:21,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1789230077] [2020-08-19 02:54:21,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:21,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:22,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:22,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:22,737 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:22,737 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1789230077] [2020-08-19 02:54:22,737 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:22,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 02:54:22,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1670925162] [2020-08-19 02:54:22,738 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 02:54:22,738 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:22,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 02:54:22,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 02:54:22,739 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-19 02:54:23,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:23,761 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-19 02:54:23,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 02:54:23,764 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-19 02:54:23,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:23,765 INFO L225 Difference]: With dead ends: 55 [2020-08-19 02:54:23,765 INFO L226 Difference]: Without dead ends: 50 [2020-08-19 02:54:23,766 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 [2020-08-19 02:54:23,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-19 02:54:23,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-19 02:54:23,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-19 02:54:23,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-19 02:54:23,770 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-19 02:54:23,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:23,771 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-19 02:54:23,771 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-19 02:54:23,771 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-19 02:54:23,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-19 02:54:23,772 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:23,772 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:23,772 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 02:54:23,772 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:23,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:23,773 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-19 02:54:23,773 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:23,773 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1081961973] [2020-08-19 02:54:23,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:23,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:24,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:24,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:24,995 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:24,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1081961973] [2020-08-19 02:54:24,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:24,995 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-19 02:54:24,995 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3807716] [2020-08-19 02:54:24,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-19 02:54:24,996 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:24,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-19 02:54:24,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 02:54:24,997 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-19 02:54:26,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:26,078 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-19 02:54:26,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-19 02:54:26,079 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-19 02:54:26,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:26,079 INFO L225 Difference]: With dead ends: 56 [2020-08-19 02:54:26,079 INFO L226 Difference]: Without dead ends: 51 [2020-08-19 02:54:26,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 02:54:26,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-19 02:54:26,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-19 02:54:26,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-19 02:54:26,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-19 02:54:26,084 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-19 02:54:26,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:26,084 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-19 02:54:26,084 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-19 02:54:26,084 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-19 02:54:26,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-19 02:54:26,085 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:26,085 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:26,085 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 02:54:26,085 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:26,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:26,086 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-19 02:54:26,086 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:26,086 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1096630097] [2020-08-19 02:54:26,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:26,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:27,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:27,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:27,411 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:27,412 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1096630097] [2020-08-19 02:54:27,412 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:27,412 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-19 02:54:27,412 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436319878] [2020-08-19 02:54:27,412 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-19 02:54:27,413 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:27,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-19 02:54:27,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 02:54:27,414 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-19 02:54:28,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:28,567 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-19 02:54:28,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-19 02:54:28,567 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-19 02:54:28,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:28,568 INFO L225 Difference]: With dead ends: 57 [2020-08-19 02:54:28,569 INFO L226 Difference]: Without dead ends: 52 [2020-08-19 02:54:28,570 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 02:54:28,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-19 02:54:28,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-19 02:54:28,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-19 02:54:28,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-19 02:54:28,576 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-19 02:54:28,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:28,576 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-19 02:54:28,576 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-19 02:54:28,576 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-19 02:54:28,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-19 02:54:28,576 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:28,577 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:28,577 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-19 02:54:28,577 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:28,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:28,577 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-19 02:54:28,577 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:28,577 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1190626641] [2020-08-19 02:54:28,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:28,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:29,914 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:29,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:29,920 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:29,920 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1190626641] [2020-08-19 02:54:29,920 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:29,921 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-19 02:54:29,921 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058566916] [2020-08-19 02:54:29,921 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-19 02:54:29,921 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:29,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-19 02:54:29,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 02:54:29,922 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-19 02:54:31,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:31,133 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-19 02:54:31,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-19 02:54:31,134 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-19 02:54:31,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:31,135 INFO L225 Difference]: With dead ends: 58 [2020-08-19 02:54:31,135 INFO L226 Difference]: Without dead ends: 53 [2020-08-19 02:54:31,137 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 [2020-08-19 02:54:31,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-19 02:54:31,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-19 02:54:31,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-19 02:54:31,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-19 02:54:31,140 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-19 02:54:31,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:31,140 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-19 02:54:31,140 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-19 02:54:31,141 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-19 02:54:31,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-19 02:54:31,141 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:31,141 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:31,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-19 02:54:31,141 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:31,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:31,142 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-19 02:54:31,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:31,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [74284128] [2020-08-19 02:54:31,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:31,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:32,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:32,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:32,691 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:32,691 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [74284128] [2020-08-19 02:54:32,691 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:32,691 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-19 02:54:32,691 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210428771] [2020-08-19 02:54:32,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-19 02:54:32,692 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:32,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-19 02:54:32,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 02:54:32,693 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-19 02:54:33,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:33,956 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-19 02:54:33,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-19 02:54:33,958 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-19 02:54:33,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:33,959 INFO L225 Difference]: With dead ends: 59 [2020-08-19 02:54:33,959 INFO L226 Difference]: Without dead ends: 54 [2020-08-19 02:54:33,960 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 02:54:33,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-19 02:54:33,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-19 02:54:33,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-19 02:54:33,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-19 02:54:33,964 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-19 02:54:33,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:33,965 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-19 02:54:33,965 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-19 02:54:33,965 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-19 02:54:33,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-19 02:54:33,965 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:33,966 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:33,966 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-19 02:54:33,966 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:33,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:33,966 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-19 02:54:33,966 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:33,967 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [324907993] [2020-08-19 02:54:33,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:33,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:35,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:35,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:35,480 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:35,480 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [324907993] [2020-08-19 02:54:35,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:35,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-19 02:54:35,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713968162] [2020-08-19 02:54:35,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-19 02:54:35,481 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:35,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-19 02:54:35,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 02:54:35,482 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-19 02:54:36,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:36,822 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-19 02:54:36,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-19 02:54:36,823 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-19 02:54:36,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:36,824 INFO L225 Difference]: With dead ends: 60 [2020-08-19 02:54:36,824 INFO L226 Difference]: Without dead ends: 55 [2020-08-19 02:54:36,824 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 02:54:36,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-19 02:54:36,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-19 02:54:36,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-19 02:54:36,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-19 02:54:36,827 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-19 02:54:36,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:36,827 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-19 02:54:36,827 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-19 02:54:36,827 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-19 02:54:36,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-19 02:54:36,828 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:36,828 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:36,828 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-19 02:54:36,828 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:36,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:36,828 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-19 02:54:36,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:36,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [838217848] [2020-08-19 02:54:36,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:36,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:38,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:38,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:38,413 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:38,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [838217848] [2020-08-19 02:54:38,414 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:38,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-19 02:54:38,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128166430] [2020-08-19 02:54:38,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-19 02:54:38,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:38,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-19 02:54:38,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 02:54:38,415 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-19 02:54:39,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:39,808 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-19 02:54:39,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-19 02:54:39,808 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-19 02:54:39,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:39,809 INFO L225 Difference]: With dead ends: 61 [2020-08-19 02:54:39,810 INFO L226 Difference]: Without dead ends: 56 [2020-08-19 02:54:39,810 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 02:54:39,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-19 02:54:39,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-19 02:54:39,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-19 02:54:39,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-19 02:54:39,814 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-19 02:54:39,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:39,815 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-19 02:54:39,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-19 02:54:39,815 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-19 02:54:39,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-19 02:54:39,815 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:39,815 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:39,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-19 02:54:39,816 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:39,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:39,816 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-19 02:54:39,816 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:39,816 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1124157430] [2020-08-19 02:54:39,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:39,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:41,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:41,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:41,424 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:41,424 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1124157430] [2020-08-19 02:54:41,424 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:41,424 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-19 02:54:41,424 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690160960] [2020-08-19 02:54:41,425 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-19 02:54:41,425 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:41,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-19 02:54:41,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-19 02:54:41,425 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-19 02:54:42,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:42,855 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-19 02:54:42,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-19 02:54:42,856 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-19 02:54:42,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:42,856 INFO L225 Difference]: With dead ends: 62 [2020-08-19 02:54:42,857 INFO L226 Difference]: Without dead ends: 57 [2020-08-19 02:54:42,857 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 [2020-08-19 02:54:42,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-19 02:54:42,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-19 02:54:42,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-19 02:54:42,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-19 02:54:42,861 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-19 02:54:42,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:42,861 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-19 02:54:42,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-19 02:54:42,861 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-19 02:54:42,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-19 02:54:42,862 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:42,862 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:42,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-19 02:54:42,862 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:42,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:42,863 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-19 02:54:42,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:42,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [873344062] [2020-08-19 02:54:42,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:42,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:44,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:44,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:44,532 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:44,532 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [873344062] [2020-08-19 02:54:44,532 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:44,533 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-19 02:54:44,533 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [459238650] [2020-08-19 02:54:44,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-19 02:54:44,533 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:44,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-19 02:54:44,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-19 02:54:44,534 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-19 02:54:46,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:46,067 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-19 02:54:46,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-19 02:54:46,068 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-19 02:54:46,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:46,069 INFO L225 Difference]: With dead ends: 63 [2020-08-19 02:54:46,069 INFO L226 Difference]: Without dead ends: 58 [2020-08-19 02:54:46,069 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 [2020-08-19 02:54:46,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-19 02:54:46,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-19 02:54:46,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-19 02:54:46,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-19 02:54:46,072 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-19 02:54:46,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:46,072 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-19 02:54:46,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-19 02:54:46,072 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-19 02:54:46,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-19 02:54:46,075 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:46,075 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:46,075 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-19 02:54:46,075 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:46,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:46,075 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-19 02:54:46,076 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:46,076 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [319845267] [2020-08-19 02:54:46,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:46,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:47,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:54:47,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:54:47,865 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:54:47,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [319845267] [2020-08-19 02:54:47,865 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:54:47,865 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-19 02:54:47,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430693375] [2020-08-19 02:54:47,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-19 02:54:47,866 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:54:47,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-19 02:54:47,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-19 02:54:47,867 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states. [2020-08-19 02:54:49,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:54:49,421 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-19 02:54:49,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-19 02:54:49,425 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 57 [2020-08-19 02:54:49,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:54:49,426 INFO L225 Difference]: With dead ends: 64 [2020-08-19 02:54:49,426 INFO L226 Difference]: Without dead ends: 59 [2020-08-19 02:54:49,427 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-19 02:54:49,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-19 02:54:49,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-19 02:54:49,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-19 02:54:49,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-19 02:54:49,431 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-08-19 02:54:49,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:54:49,431 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-19 02:54:49,431 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-19 02:54:49,432 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-19 02:54:49,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-19 02:54:49,432 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:54:49,432 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:54:49,432 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-19 02:54:49,433 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:54:49,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:54:49,433 INFO L82 PathProgramCache]: Analyzing trace with hash -809482178, now seen corresponding path program 48 times [2020-08-19 02:54:49,433 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:54:49,433 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1051242233] [2020-08-19 02:54:49,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:54:49,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat