/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 false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-eb0fd7c [2020-09-21 10:29:46,794 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-21 10:29:46,799 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-21 10:29:46,844 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-21 10:29:46,844 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 10:29:46,852 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 10:29:46,857 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 10:29:46,860 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 10:29:46,863 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 10:29:46,866 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 10:29:46,867 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 10:29:46,869 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 10:29:46,869 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 10:29:46,872 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 10:29:46,874 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 10:29:46,876 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 10:29:46,878 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 10:29:46,879 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 10:29:46,881 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 10:29:46,889 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 10:29:46,891 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 10:29:46,893 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 10:29:46,894 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 10:29:46,895 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 10:29:46,907 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-21 10:29:46,908 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-21 10:29:46,908 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-21 10:29:46,915 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-21 10:29:46,916 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-21 10:29:46,917 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-09-21 10:29:46,927 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 10:29:46,929 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 10:29:46,931 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 10:29:46,932 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 [2020-09-21 10:29:46,979 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 10:29:46,980 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 10:29:46,982 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 10:29:46,982 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 10:29:46,982 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 10:29:46,983 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 10:29:46,983 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 10:29:46,983 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 10:29:46,984 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 10:29:46,984 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 10:29:46,985 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 10:29:46,985 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 10:29:46,985 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 10:29:46,986 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 10:29:46,986 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 10:29:46,986 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 10:29:46,986 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 10:29:46,986 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 10:29:46,987 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 10:29:46,987 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 10:29:46,987 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 10:29:46,987 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:29:46,987 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 10:29:46,988 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 10:29:46,988 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 10:29:46,988 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 10:29:46,988 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 10:29:46,988 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 10:29:46,989 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 10:29:46,989 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 -> false [2020-09-21 10:29:47,456 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 10:29:47,474 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 10:29:47,479 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 10:29:47,480 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 10:29:47,481 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 10:29:47,482 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-09-21 10:29:47,570 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/3b9e7c4b5/3e02237be36a4997a0956152c3418942/FLAG508e5307c [2020-09-21 10:29:48,162 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 10:29:48,163 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-09-21 10:29:48,172 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/3b9e7c4b5/3e02237be36a4997a0956152c3418942/FLAG508e5307c [2020-09-21 10:29:48,504 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/3b9e7c4b5/3e02237be36a4997a0956152c3418942 [2020-09-21 10:29:48,520 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 10:29:48,526 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 10:29:48,527 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 10:29:48,528 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 10:29:48,532 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 10:29:48,534 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:29:48" (1/1) ... [2020-09-21 10:29:48,538 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2719192c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:48, skipping insertion in model container [2020-09-21 10:29:48,539 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:29:48" (1/1) ... [2020-09-21 10:29:48,548 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 10:29:48,575 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 10:29:48,797 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:29:48,804 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 10:29:48,825 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:29:48,844 INFO L208 MainTranslator]: Completed translation [2020-09-21 10:29:48,844 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:48 WrapperNode [2020-09-21 10:29:48,845 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 10:29:48,846 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 10:29:48,846 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 10:29:48,846 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 10:29:48,864 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:48" (1/1) ... [2020-09-21 10:29:48,864 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:48" (1/1) ... [2020-09-21 10:29:48,957 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:48" (1/1) ... [2020-09-21 10:29:48,958 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:48" (1/1) ... [2020-09-21 10:29:48,962 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:48" (1/1) ... [2020-09-21 10:29:48,968 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:48" (1/1) ... [2020-09-21 10:29:48,969 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:48" (1/1) ... [2020-09-21 10:29:48,971 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 10:29:48,972 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 10:29:48,972 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 10:29:48,972 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 10:29:48,976 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:48" (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 [2020-09-21 10:29:49,043 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 10:29:49,043 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 10:29:49,044 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-09-21 10:29:49,044 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-21 10:29:49,044 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 10:29:49,044 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 10:29:49,044 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-21 10:29:49,045 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-09-21 10:29:49,045 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-21 10:29:49,045 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-21 10:29:49,045 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 10:29:49,045 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 10:29:49,046 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 10:29:49,249 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 10:29:49,249 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-09-21 10:29:49,253 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:29:49 BoogieIcfgContainer [2020-09-21 10:29:49,254 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 10:29:49,255 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 10:29:49,255 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 10:29:49,259 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 10:29:49,260 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 10:29:48" (1/3) ... [2020-09-21 10:29:49,261 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c8fa55e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:29:49, skipping insertion in model container [2020-09-21 10:29:49,261 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:48" (2/3) ... [2020-09-21 10:29:49,261 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c8fa55e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:29:49, skipping insertion in model container [2020-09-21 10:29:49,262 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:29:49" (3/3) ... [2020-09-21 10:29:49,264 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005b.i [2020-09-21 10:29:49,276 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 10:29:49,286 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 10:29:49,305 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 10:29:49,330 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 10:29:49,331 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 10:29:49,331 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 10:29:49,331 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 10:29:49,331 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 10:29:49,331 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 10:29:49,332 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 10:29:49,332 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 10:29:49,353 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-09-21 10:29:49,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-09-21 10:29:49,359 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:49,360 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:49,361 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:49,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:49,367 INFO L82 PathProgramCache]: Analyzing trace with hash -1039733575, now seen corresponding path program 1 times [2020-09-21 10:29:49,376 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:49,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [822696798] [2020-09-21 10:29:49,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:49,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:49,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:49,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:49,514 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:49,515 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [822696798] [2020-09-21 10:29:49,518 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:29:49,518 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-09-21 10:29:49,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366950707] [2020-09-21 10:29:49,526 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-09-21 10:29:49,527 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:49,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-09-21 10:29:49,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-09-21 10:29:49,549 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-09-21 10:29:49,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:49,582 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-09-21 10:29:49,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-09-21 10:29:49,584 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-09-21 10:29:49,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:49,595 INFO L225 Difference]: With dead ends: 37 [2020-09-21 10:29:49,595 INFO L226 Difference]: Without dead ends: 14 [2020-09-21 10:29:49,600 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-09-21 10:29:49,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-09-21 10:29:49,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-09-21 10:29:49,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-09-21 10:29:49,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-09-21 10:29:49,640 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2020-09-21 10:29:49,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:49,641 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-09-21 10:29:49,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-09-21 10:29:49,641 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-09-21 10:29:49,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-09-21 10:29:49,642 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:49,642 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:49,642 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 10:29:49,643 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:49,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:49,643 INFO L82 PathProgramCache]: Analyzing trace with hash -1066515684, now seen corresponding path program 1 times [2020-09-21 10:29:49,643 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:49,643 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1769557083] [2020-09-21 10:29:49,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:49,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:49,694 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:49,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:49,699 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:49,699 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1769557083] [2020-09-21 10:29:49,700 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:29:49,700 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-21 10:29:49,700 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298612470] [2020-09-21 10:29:49,702 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-21 10:29:49,704 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:49,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-21 10:29:49,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-21 10:29:49,708 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-09-21 10:29:49,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:49,729 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-09-21 10:29:49,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-21 10:29:49,731 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-09-21 10:29:49,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:49,733 INFO L225 Difference]: With dead ends: 20 [2020-09-21 10:29:49,733 INFO L226 Difference]: Without dead ends: 15 [2020-09-21 10:29:49,735 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 [2020-09-21 10:29:49,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-09-21 10:29:49,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-09-21 10:29:49,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-09-21 10:29:49,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-09-21 10:29:49,745 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2020-09-21 10:29:49,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:49,760 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-09-21 10:29:49,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-21 10:29:49,761 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-09-21 10:29:49,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-09-21 10:29:49,762 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:49,763 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:49,766 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 10:29:49,767 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:49,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:49,768 INFO L82 PathProgramCache]: Analyzing trace with hash 1875131310, now seen corresponding path program 1 times [2020-09-21 10:29:49,768 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:49,770 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [283747511] [2020-09-21 10:29:49,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:49,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:49,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:49,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:49,836 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:49,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [283747511] [2020-09-21 10:29:49,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:29:49,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-21 10:29:49,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719037253] [2020-09-21 10:29:49,838 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-21 10:29:49,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:49,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-21 10:29:49,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-21 10:29:49,840 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-09-21 10:29:49,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:49,852 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-09-21 10:29:49,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-21 10:29:49,853 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-09-21 10:29:49,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:49,854 INFO L225 Difference]: With dead ends: 25 [2020-09-21 10:29:49,854 INFO L226 Difference]: Without dead ends: 16 [2020-09-21 10:29:49,855 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 [2020-09-21 10:29:49,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-09-21 10:29:49,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-09-21 10:29:49,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-09-21 10:29:49,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-09-21 10:29:49,861 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2020-09-21 10:29:49,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:49,861 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-09-21 10:29:49,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-21 10:29:49,862 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-09-21 10:29:49,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-09-21 10:29:49,862 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:49,863 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:49,863 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 10:29:49,863 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:49,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:49,864 INFO L82 PathProgramCache]: Analyzing trace with hash -224898986, now seen corresponding path program 1 times [2020-09-21 10:29:49,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:49,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [113659849] [2020-09-21 10:29:49,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:49,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:49,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:49,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:49,931 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:49,931 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [113659849] [2020-09-21 10:29:49,932 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:49,932 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-09-21 10:29:49,932 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815742048] [2020-09-21 10:29:49,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 10:29:49,933 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:49,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 10:29:49,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:29:49,934 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-09-21 10:29:49,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:49,995 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-09-21 10:29:49,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 10:29:49,996 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-09-21 10:29:49,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:49,997 INFO L225 Difference]: With dead ends: 26 [2020-09-21 10:29:49,997 INFO L226 Difference]: Without dead ends: 17 [2020-09-21 10:29:49,998 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:29:49,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-09-21 10:29:50,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-09-21 10:29:50,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-09-21 10:29:50,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-09-21 10:29:50,005 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2020-09-21 10:29:50,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:50,005 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-09-21 10:29:50,005 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 10:29:50,006 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-09-21 10:29:50,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-21 10:29:50,006 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:50,007 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:50,007 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 10:29:50,007 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:50,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:50,008 INFO L82 PathProgramCache]: Analyzing trace with hash -901328722, now seen corresponding path program 2 times [2020-09-21 10:29:50,008 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:50,009 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [930454335] [2020-09-21 10:29:50,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:50,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:50,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:50,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:50,083 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:50,084 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [930454335] [2020-09-21 10:29:50,084 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:50,084 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-09-21 10:29:50,085 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881362384] [2020-09-21 10:29:50,085 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 10:29:50,086 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:50,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 10:29:50,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:29:50,087 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-09-21 10:29:50,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:50,176 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-09-21 10:29:50,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 10:29:50,177 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-09-21 10:29:50,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:50,178 INFO L225 Difference]: With dead ends: 27 [2020-09-21 10:29:50,178 INFO L226 Difference]: Without dead ends: 18 [2020-09-21 10:29:50,179 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2020-09-21 10:29:50,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-09-21 10:29:50,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-09-21 10:29:50,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-09-21 10:29:50,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-09-21 10:29:50,186 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 16 [2020-09-21 10:29:50,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:50,187 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-09-21 10:29:50,187 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 10:29:50,187 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-09-21 10:29:50,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-09-21 10:29:50,188 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:50,188 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:50,188 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-21 10:29:50,188 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:50,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:50,189 INFO L82 PathProgramCache]: Analyzing trace with hash -395814058, now seen corresponding path program 3 times [2020-09-21 10:29:50,189 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:50,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1421086760] [2020-09-21 10:29:50,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:50,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:50,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:50,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:50,277 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:50,278 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1421086760] [2020-09-21 10:29:50,278 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:50,278 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-21 10:29:50,279 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219141347] [2020-09-21 10:29:50,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-21 10:29:50,279 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:50,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-21 10:29:50,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:29:50,281 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2020-09-21 10:29:50,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:50,395 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-09-21 10:29:50,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-21 10:29:50,396 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-09-21 10:29:50,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:50,397 INFO L225 Difference]: With dead ends: 28 [2020-09-21 10:29:50,397 INFO L226 Difference]: Without dead ends: 19 [2020-09-21 10:29:50,398 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-09-21 10:29:50,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-09-21 10:29:50,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-09-21 10:29:50,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-09-21 10:29:50,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-09-21 10:29:50,405 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2020-09-21 10:29:50,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:50,406 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-09-21 10:29:50,406 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-21 10:29:50,406 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-09-21 10:29:50,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-09-21 10:29:50,407 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:50,407 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:50,408 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-21 10:29:50,408 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:50,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:50,408 INFO L82 PathProgramCache]: Analyzing trace with hash -1904728658, now seen corresponding path program 4 times [2020-09-21 10:29:50,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:50,409 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1958922257] [2020-09-21 10:29:50,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:50,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:50,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:50,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:50,538 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:50,539 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1958922257] [2020-09-21 10:29:50,539 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:50,539 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-21 10:29:50,540 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072613656] [2020-09-21 10:29:50,540 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-21 10:29:50,540 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:50,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-21 10:29:50,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-09-21 10:29:50,544 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 8 states. [2020-09-21 10:29:50,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:50,707 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-09-21 10:29:50,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-21 10:29:50,710 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-09-21 10:29:50,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:50,711 INFO L225 Difference]: With dead ends: 29 [2020-09-21 10:29:50,711 INFO L226 Difference]: Without dead ends: 20 [2020-09-21 10:29:50,712 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:29:50,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-09-21 10:29:50,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-09-21 10:29:50,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-09-21 10:29:50,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-09-21 10:29:50,721 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2020-09-21 10:29:50,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:50,725 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-09-21 10:29:50,725 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-21 10:29:50,725 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-09-21 10:29:50,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-09-21 10:29:50,726 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:50,726 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:50,727 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-21 10:29:50,727 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:50,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:50,727 INFO L82 PathProgramCache]: Analyzing trace with hash -1436441002, now seen corresponding path program 5 times [2020-09-21 10:29:50,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:50,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [123948439] [2020-09-21 10:29:50,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:50,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:50,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:50,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:50,851 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:50,851 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [123948439] [2020-09-21 10:29:50,852 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:50,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-21 10:29:50,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953936835] [2020-09-21 10:29:50,853 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-21 10:29:50,853 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:50,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-21 10:29:50,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-09-21 10:29:50,854 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2020-09-21 10:29:51,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:51,027 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-09-21 10:29:51,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-21 10:29:51,028 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-09-21 10:29:51,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:51,029 INFO L225 Difference]: With dead ends: 30 [2020-09-21 10:29:51,029 INFO L226 Difference]: Without dead ends: 21 [2020-09-21 10:29:51,030 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2020-09-21 10:29:51,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-09-21 10:29:51,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-09-21 10:29:51,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-09-21 10:29:51,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-09-21 10:29:51,036 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 19 [2020-09-21 10:29:51,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:51,036 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-09-21 10:29:51,036 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-21 10:29:51,036 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-09-21 10:29:51,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-09-21 10:29:51,037 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:51,037 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:51,038 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-21 10:29:51,038 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:51,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:51,038 INFO L82 PathProgramCache]: Analyzing trace with hash 195574446, now seen corresponding path program 6 times [2020-09-21 10:29:51,039 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:51,039 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1216307809] [2020-09-21 10:29:51,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:51,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:51,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:51,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:51,088 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-09-21 10:29:51,088 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1216307809] [2020-09-21 10:29:51,088 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:51,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-09-21 10:29:51,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595879607] [2020-09-21 10:29:51,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 10:29:51,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:51,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 10:29:51,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:29:51,094 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 4 states. [2020-09-21 10:29:51,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:51,118 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-09-21 10:29:51,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-21 10:29:51,119 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-09-21 10:29:51,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:51,120 INFO L225 Difference]: With dead ends: 30 [2020-09-21 10:29:51,120 INFO L226 Difference]: Without dead ends: 25 [2020-09-21 10:29:51,121 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 [2020-09-21 10:29:51,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-09-21 10:29:51,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-09-21 10:29:51,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-09-21 10:29:51,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-09-21 10:29:51,130 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 20 [2020-09-21 10:29:51,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:51,131 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-09-21 10:29:51,133 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 10:29:51,133 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-09-21 10:29:51,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-09-21 10:29:51,134 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:51,135 INFO L422 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:51,135 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-21 10:29:51,135 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:51,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:51,136 INFO L82 PathProgramCache]: Analyzing trace with hash 389290560, now seen corresponding path program 7 times [2020-09-21 10:29:51,136 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:51,136 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [12863973] [2020-09-21 10:29:51,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:51,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:51,215 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:51,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:51,218 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-09-21 10:29:51,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [12863973] [2020-09-21 10:29:51,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:51,219 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-09-21 10:29:51,219 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598313209] [2020-09-21 10:29:51,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 10:29:51,220 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:51,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 10:29:51,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:29:51,220 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-09-21 10:29:51,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:51,243 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2020-09-21 10:29:51,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 10:29:51,243 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-09-21 10:29:51,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:51,244 INFO L225 Difference]: With dead ends: 34 [2020-09-21 10:29:51,244 INFO L226 Difference]: Without dead ends: 29 [2020-09-21 10:29:51,245 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:29:51,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-09-21 10:29:51,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-09-21 10:29:51,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-09-21 10:29:51,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2020-09-21 10:29:51,251 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 24 [2020-09-21 10:29:51,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:51,251 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2020-09-21 10:29:51,252 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 10:29:51,252 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2020-09-21 10:29:51,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-09-21 10:29:51,252 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:51,253 INFO L422 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:51,253 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-21 10:29:51,253 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:51,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:51,254 INFO L82 PathProgramCache]: Analyzing trace with hash -1279139630, now seen corresponding path program 8 times [2020-09-21 10:29:51,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:51,254 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [595412337] [2020-09-21 10:29:51,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:51,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:51,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:51,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:51,329 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-09-21 10:29:51,330 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [595412337] [2020-09-21 10:29:51,330 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:51,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-09-21 10:29:51,331 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170766324] [2020-09-21 10:29:51,331 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 10:29:51,332 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:51,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 10:29:51,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:29:51,334 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand 6 states. [2020-09-21 10:29:51,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:51,366 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-09-21 10:29:51,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 10:29:51,367 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-09-21 10:29:51,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:51,368 INFO L225 Difference]: With dead ends: 38 [2020-09-21 10:29:51,368 INFO L226 Difference]: Without dead ends: 33 [2020-09-21 10:29:51,368 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:29:51,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-09-21 10:29:51,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-09-21 10:29:51,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-09-21 10:29:51,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-09-21 10:29:51,375 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 28 [2020-09-21 10:29:51,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:51,375 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-09-21 10:29:51,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 10:29:51,375 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-09-21 10:29:51,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-09-21 10:29:51,376 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:51,376 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:51,377 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-21 10:29:51,377 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:51,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:51,377 INFO L82 PathProgramCache]: Analyzing trace with hash 805703268, now seen corresponding path program 9 times [2020-09-21 10:29:51,378 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:51,378 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1593591785] [2020-09-21 10:29:51,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:51,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:51,492 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:51,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:51,496 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 25 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-09-21 10:29:51,497 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1593591785] [2020-09-21 10:29:51,497 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:51,497 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-21 10:29:51,497 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225364703] [2020-09-21 10:29:51,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-21 10:29:51,498 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:51,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-21 10:29:51,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:29:51,499 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 10 states. [2020-09-21 10:29:51,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:51,694 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2020-09-21 10:29:51,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-21 10:29:51,694 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2020-09-21 10:29:51,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:51,695 INFO L225 Difference]: With dead ends: 54 [2020-09-21 10:29:51,696 INFO L226 Difference]: Without dead ends: 34 [2020-09-21 10:29:51,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-09-21 10:29:51,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-09-21 10:29:51,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-09-21 10:29:51,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-09-21 10:29:51,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-09-21 10:29:51,704 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 32 [2020-09-21 10:29:51,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:51,704 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-09-21 10:29:51,704 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-21 10:29:51,704 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-09-21 10:29:51,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-09-21 10:29:51,705 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:51,706 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:51,706 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-09-21 10:29:51,706 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:51,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:51,707 INFO L82 PathProgramCache]: Analyzing trace with hash 1833781516, now seen corresponding path program 10 times [2020-09-21 10:29:51,707 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:51,707 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2096281412] [2020-09-21 10:29:51,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:51,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:51,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:51,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:51,830 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-09-21 10:29:51,830 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2096281412] [2020-09-21 10:29:51,831 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:51,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-09-21 10:29:51,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991209691] [2020-09-21 10:29:51,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-21 10:29:51,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:51,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-21 10:29:51,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-09-21 10:29:51,832 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 11 states. [2020-09-21 10:29:52,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:52,059 INFO L93 Difference]: Finished difference Result 55 states and 71 transitions. [2020-09-21 10:29:52,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-09-21 10:29:52,059 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2020-09-21 10:29:52,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:52,060 INFO L225 Difference]: With dead ends: 55 [2020-09-21 10:29:52,060 INFO L226 Difference]: Without dead ends: 35 [2020-09-21 10:29:52,061 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=234, Unknown=0, NotChecked=0, Total=342 [2020-09-21 10:29:52,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-09-21 10:29:52,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-09-21 10:29:52,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-09-21 10:29:52,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2020-09-21 10:29:52,067 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 33 [2020-09-21 10:29:52,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:52,068 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2020-09-21 10:29:52,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-21 10:29:52,068 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2020-09-21 10:29:52,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-09-21 10:29:52,069 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:52,069 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:52,069 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-09-21 10:29:52,069 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:52,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:52,070 INFO L82 PathProgramCache]: Analyzing trace with hash -655531164, now seen corresponding path program 11 times [2020-09-21 10:29:52,070 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:52,070 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [650689451] [2020-09-21 10:29:52,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:52,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:52,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:52,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:52,194 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 31 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-09-21 10:29:52,195 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [650689451] [2020-09-21 10:29:52,195 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:52,195 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-09-21 10:29:52,195 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649690264] [2020-09-21 10:29:52,196 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-21 10:29:52,196 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:52,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-21 10:29:52,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2020-09-21 10:29:52,197 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand 12 states. [2020-09-21 10:29:52,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:52,445 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2020-09-21 10:29:52,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-21 10:29:52,447 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-09-21 10:29:52,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:52,447 INFO L225 Difference]: With dead ends: 56 [2020-09-21 10:29:52,448 INFO L226 Difference]: Without dead ends: 36 [2020-09-21 10:29:52,448 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2020-09-21 10:29:52,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-09-21 10:29:52,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-09-21 10:29:52,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-09-21 10:29:52,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2020-09-21 10:29:52,454 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 34 [2020-09-21 10:29:52,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:52,455 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2020-09-21 10:29:52,455 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-21 10:29:52,455 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2020-09-21 10:29:52,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-09-21 10:29:52,456 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:52,456 INFO L422 BasicCegarLoop]: trace histogram [9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:52,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-09-21 10:29:52,456 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:52,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:52,457 INFO L82 PathProgramCache]: Analyzing trace with hash -514812916, now seen corresponding path program 12 times [2020-09-21 10:29:52,457 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:52,457 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [48498047] [2020-09-21 10:29:52,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:52,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:52,598 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:52,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:52,601 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 34 proven. 45 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-09-21 10:29:52,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [48498047] [2020-09-21 10:29:52,602 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:52,602 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-21 10:29:52,602 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930262835] [2020-09-21 10:29:52,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-21 10:29:52,603 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:52,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-21 10:29:52,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:29:52,604 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand 13 states. [2020-09-21 10:29:52,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:52,918 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2020-09-21 10:29:52,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-21 10:29:52,919 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-09-21 10:29:52,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:52,920 INFO L225 Difference]: With dead ends: 57 [2020-09-21 10:29:52,920 INFO L226 Difference]: Without dead ends: 37 [2020-09-21 10:29:52,921 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2020-09-21 10:29:52,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-09-21 10:29:52,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-09-21 10:29:52,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-09-21 10:29:52,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2020-09-21 10:29:52,934 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 35 [2020-09-21 10:29:52,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:52,934 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2020-09-21 10:29:52,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-21 10:29:52,939 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2020-09-21 10:29:52,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-09-21 10:29:52,940 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:52,940 INFO L422 BasicCegarLoop]: trace histogram [10, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:52,940 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-09-21 10:29:52,940 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:52,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:52,943 INFO L82 PathProgramCache]: Analyzing trace with hash -447514524, now seen corresponding path program 13 times [2020-09-21 10:29:52,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:52,943 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1929664817] [2020-09-21 10:29:52,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:52,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:53,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:53,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:53,123 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 37 proven. 55 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-09-21 10:29:53,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1929664817] [2020-09-21 10:29:53,124 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:53,124 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-09-21 10:29:53,124 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98299483] [2020-09-21 10:29:53,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-09-21 10:29:53,128 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:53,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-09-21 10:29:53,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-09-21 10:29:53,129 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand 14 states. [2020-09-21 10:29:53,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:53,535 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2020-09-21 10:29:53,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-21 10:29:53,535 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-09-21 10:29:53,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:53,536 INFO L225 Difference]: With dead ends: 58 [2020-09-21 10:29:53,536 INFO L226 Difference]: Without dead ends: 38 [2020-09-21 10:29:53,537 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2020-09-21 10:29:53,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-09-21 10:29:53,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-09-21 10:29:53,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-09-21 10:29:53,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-09-21 10:29:53,544 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 36 [2020-09-21 10:29:53,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:53,544 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-09-21 10:29:53,544 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-09-21 10:29:53,545 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-09-21 10:29:53,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-09-21 10:29:53,545 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:53,545 INFO L422 BasicCegarLoop]: trace histogram [11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:53,546 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-09-21 10:29:53,546 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:53,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:53,546 INFO L82 PathProgramCache]: Analyzing trace with hash 1638735628, now seen corresponding path program 14 times [2020-09-21 10:29:53,546 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:53,547 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1661191508] [2020-09-21 10:29:53,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:53,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:53,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:53,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:53,701 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 40 proven. 66 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-09-21 10:29:53,701 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1661191508] [2020-09-21 10:29:53,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:53,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-09-21 10:29:53,702 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325197457] [2020-09-21 10:29:53,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-09-21 10:29:53,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:53,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-09-21 10:29:53,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2020-09-21 10:29:53,704 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 15 states. [2020-09-21 10:29:54,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:54,110 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2020-09-21 10:29:54,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-21 10:29:54,110 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-09-21 10:29:54,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:54,111 INFO L225 Difference]: With dead ends: 59 [2020-09-21 10:29:54,112 INFO L226 Difference]: Without dead ends: 39 [2020-09-21 10:29:54,112 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2020-09-21 10:29:54,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-09-21 10:29:54,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-09-21 10:29:54,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-09-21 10:29:54,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2020-09-21 10:29:54,119 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 37 [2020-09-21 10:29:54,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:54,119 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2020-09-21 10:29:54,119 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-09-21 10:29:54,120 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2020-09-21 10:29:54,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-09-21 10:29:54,120 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:54,120 INFO L422 BasicCegarLoop]: trace histogram [12, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:54,121 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-09-21 10:29:54,121 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:54,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:54,121 INFO L82 PathProgramCache]: Analyzing trace with hash 1887980900, now seen corresponding path program 15 times [2020-09-21 10:29:54,122 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:54,122 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [167798879] [2020-09-21 10:29:54,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:54,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:54,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:54,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:54,335 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 43 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-09-21 10:29:54,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [167798879] [2020-09-21 10:29:54,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:54,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-09-21 10:29:54,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347681612] [2020-09-21 10:29:54,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-09-21 10:29:54,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:54,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-09-21 10:29:54,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2020-09-21 10:29:54,341 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand 16 states. [2020-09-21 10:29:54,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:54,821 INFO L93 Difference]: Finished difference Result 60 states and 76 transitions. [2020-09-21 10:29:54,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-09-21 10:29:54,823 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-09-21 10:29:54,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:54,824 INFO L225 Difference]: With dead ends: 60 [2020-09-21 10:29:54,824 INFO L226 Difference]: Without dead ends: 40 [2020-09-21 10:29:54,825 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=238, Invalid=574, Unknown=0, NotChecked=0, Total=812 [2020-09-21 10:29:54,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-09-21 10:29:54,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-09-21 10:29:54,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-09-21 10:29:54,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-09-21 10:29:54,834 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 38 [2020-09-21 10:29:54,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:54,834 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-09-21 10:29:54,835 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-09-21 10:29:54,835 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-09-21 10:29:54,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-09-21 10:29:54,836 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:54,836 INFO L422 BasicCegarLoop]: trace histogram [13, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:54,836 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-09-21 10:29:54,836 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:54,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:54,837 INFO L82 PathProgramCache]: Analyzing trace with hash 1024649740, now seen corresponding path program 16 times [2020-09-21 10:29:54,837 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:54,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1976079325] [2020-09-21 10:29:54,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:54,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:55,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:55,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:55,097 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 46 proven. 91 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-09-21 10:29:55,098 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1976079325] [2020-09-21 10:29:55,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:55,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-09-21 10:29:55,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658315042] [2020-09-21 10:29:55,099 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-09-21 10:29:55,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:55,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-09-21 10:29:55,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2020-09-21 10:29:55,100 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 17 states. [2020-09-21 10:29:55,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:55,702 INFO L93 Difference]: Finished difference Result 61 states and 77 transitions. [2020-09-21 10:29:55,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-09-21 10:29:55,704 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2020-09-21 10:29:55,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:55,704 INFO L225 Difference]: With dead ends: 61 [2020-09-21 10:29:55,704 INFO L226 Difference]: Without dead ends: 41 [2020-09-21 10:29:55,705 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=270, Invalid=660, Unknown=0, NotChecked=0, Total=930 [2020-09-21 10:29:55,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-09-21 10:29:55,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-09-21 10:29:55,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-09-21 10:29:55,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2020-09-21 10:29:55,713 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 39 [2020-09-21 10:29:55,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:55,713 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2020-09-21 10:29:55,714 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-09-21 10:29:55,714 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2020-09-21 10:29:55,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-09-21 10:29:55,714 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:55,714 INFO L422 BasicCegarLoop]: trace histogram [14, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:55,715 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-09-21 10:29:55,715 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:55,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:55,715 INFO L82 PathProgramCache]: Analyzing trace with hash 31187556, now seen corresponding path program 17 times [2020-09-21 10:29:55,715 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:55,716 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [316194859] [2020-09-21 10:29:55,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:55,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:55,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:55,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:55,951 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 49 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-09-21 10:29:55,951 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [316194859] [2020-09-21 10:29:55,952 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:55,952 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-09-21 10:29:55,952 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879709764] [2020-09-21 10:29:55,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-09-21 10:29:55,952 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:55,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-09-21 10:29:55,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2020-09-21 10:29:55,953 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 18 states. [2020-09-21 10:29:56,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:56,622 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2020-09-21 10:29:56,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-09-21 10:29:56,623 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-09-21 10:29:56,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:56,624 INFO L225 Difference]: With dead ends: 62 [2020-09-21 10:29:56,624 INFO L226 Difference]: Without dead ends: 42 [2020-09-21 10:29:56,625 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=304, Invalid=752, Unknown=0, NotChecked=0, Total=1056 [2020-09-21 10:29:56,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-09-21 10:29:56,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-09-21 10:29:56,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-09-21 10:29:56,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2020-09-21 10:29:56,632 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 40 [2020-09-21 10:29:56,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:56,632 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2020-09-21 10:29:56,632 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-09-21 10:29:56,632 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2020-09-21 10:29:56,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-09-21 10:29:56,633 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:56,633 INFO L422 BasicCegarLoop]: trace histogram [15, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:56,633 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-09-21 10:29:56,633 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:56,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:56,634 INFO L82 PathProgramCache]: Analyzing trace with hash -701369076, now seen corresponding path program 18 times [2020-09-21 10:29:56,634 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:56,634 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1519444922] [2020-09-21 10:29:56,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:56,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:56,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:56,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:56,871 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 52 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-09-21 10:29:56,872 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1519444922] [2020-09-21 10:29:56,872 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:56,872 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-09-21 10:29:56,872 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395250603] [2020-09-21 10:29:56,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-09-21 10:29:56,873 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:56,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-09-21 10:29:56,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2020-09-21 10:29:56,873 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 19 states. [2020-09-21 10:29:57,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:57,606 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-09-21 10:29:57,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-09-21 10:29:57,607 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 41 [2020-09-21 10:29:57,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:57,608 INFO L225 Difference]: With dead ends: 63 [2020-09-21 10:29:57,608 INFO L226 Difference]: Without dead ends: 43 [2020-09-21 10:29:57,609 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2020-09-21 10:29:57,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-09-21 10:29:57,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-09-21 10:29:57,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-09-21 10:29:57,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2020-09-21 10:29:57,616 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 41 [2020-09-21 10:29:57,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:57,616 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2020-09-21 10:29:57,616 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-09-21 10:29:57,616 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2020-09-21 10:29:57,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-09-21 10:29:57,617 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:57,617 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:57,617 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-09-21 10:29:57,617 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:57,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:57,618 INFO L82 PathProgramCache]: Analyzing trace with hash -1935788188, now seen corresponding path program 19 times [2020-09-21 10:29:57,618 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:57,618 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [334546501] [2020-09-21 10:29:57,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:57,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:57,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:57,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:57,953 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 55 proven. 136 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-09-21 10:29:57,953 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [334546501] [2020-09-21 10:29:57,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:57,953 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-09-21 10:29:57,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062250407] [2020-09-21 10:29:57,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-09-21 10:29:57,954 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:57,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-09-21 10:29:57,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2020-09-21 10:29:57,955 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 20 states. [2020-09-21 10:29:58,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:58,818 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2020-09-21 10:29:58,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-09-21 10:29:58,822 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2020-09-21 10:29:58,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:58,823 INFO L225 Difference]: With dead ends: 64 [2020-09-21 10:29:58,823 INFO L226 Difference]: Without dead ends: 44 [2020-09-21 10:29:58,824 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=378, Invalid=954, Unknown=0, NotChecked=0, Total=1332 [2020-09-21 10:29:58,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-09-21 10:29:58,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-09-21 10:29:58,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-09-21 10:29:58,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2020-09-21 10:29:58,831 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 42 [2020-09-21 10:29:58,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:58,831 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2020-09-21 10:29:58,831 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-09-21 10:29:58,831 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2020-09-21 10:29:58,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-09-21 10:29:58,832 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:58,832 INFO L422 BasicCegarLoop]: trace histogram [17, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:58,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-09-21 10:29:58,832 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:58,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:58,833 INFO L82 PathProgramCache]: Analyzing trace with hash -1548074996, now seen corresponding path program 20 times [2020-09-21 10:29:58,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:58,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1349732484] [2020-09-21 10:29:58,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:58,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:59,158 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:59,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:59,162 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 58 proven. 153 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-09-21 10:29:59,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1349732484] [2020-09-21 10:29:59,163 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:59,163 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-09-21 10:29:59,163 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931094381] [2020-09-21 10:29:59,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-09-21 10:29:59,164 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:59,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-09-21 10:29:59,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2020-09-21 10:29:59,165 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand 21 states. [2020-09-21 10:30:00,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:00,077 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2020-09-21 10:30:00,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-09-21 10:30:00,077 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-09-21 10:30:00,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:00,078 INFO L225 Difference]: With dead ends: 65 [2020-09-21 10:30:00,078 INFO L226 Difference]: Without dead ends: 45 [2020-09-21 10:30:00,079 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=418, Invalid=1064, Unknown=0, NotChecked=0, Total=1482 [2020-09-21 10:30:00,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-09-21 10:30:00,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-09-21 10:30:00,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-09-21 10:30:00,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2020-09-21 10:30:00,086 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 43 [2020-09-21 10:30:00,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:00,087 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2020-09-21 10:30:00,087 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-09-21 10:30:00,087 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2020-09-21 10:30:00,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-09-21 10:30:00,087 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:00,088 INFO L422 BasicCegarLoop]: trace histogram [18, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:00,088 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-09-21 10:30:00,088 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:00,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:00,088 INFO L82 PathProgramCache]: Analyzing trace with hash 1881099364, now seen corresponding path program 21 times [2020-09-21 10:30:00,088 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:00,089 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1952237866] [2020-09-21 10:30:00,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:00,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:00,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:00,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:00,469 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 61 proven. 171 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-09-21 10:30:00,469 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1952237866] [2020-09-21 10:30:00,469 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:00,469 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-09-21 10:30:00,470 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [17969798] [2020-09-21 10:30:00,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-09-21 10:30:00,470 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:00,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-09-21 10:30:00,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2020-09-21 10:30:00,471 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 22 states. [2020-09-21 10:30:01,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:01,507 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-09-21 10:30:01,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-09-21 10:30:01,508 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 44 [2020-09-21 10:30:01,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:01,509 INFO L225 Difference]: With dead ends: 66 [2020-09-21 10:30:01,509 INFO L226 Difference]: Without dead ends: 46 [2020-09-21 10:30:01,510 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2020-09-21 10:30:01,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-09-21 10:30:01,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-09-21 10:30:01,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-09-21 10:30:01,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2020-09-21 10:30:01,516 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 44 [2020-09-21 10:30:01,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:01,517 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2020-09-21 10:30:01,517 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-09-21 10:30:01,517 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2020-09-21 10:30:01,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-09-21 10:30:01,518 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:01,518 INFO L422 BasicCegarLoop]: trace histogram [19, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:01,518 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-09-21 10:30:01,518 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:01,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:01,519 INFO L82 PathProgramCache]: Analyzing trace with hash 811322124, now seen corresponding path program 22 times [2020-09-21 10:30:01,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:01,519 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1718959262] [2020-09-21 10:30:01,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:01,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:01,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:01,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:01,905 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 64 proven. 190 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-09-21 10:30:01,905 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1718959262] [2020-09-21 10:30:01,906 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:01,906 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-09-21 10:30:01,906 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982625415] [2020-09-21 10:30:01,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-09-21 10:30:01,907 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:01,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-09-21 10:30:01,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2020-09-21 10:30:01,907 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 23 states. [2020-09-21 10:30:03,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:03,068 INFO L93 Difference]: Finished difference Result 67 states and 83 transitions. [2020-09-21 10:30:03,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-09-21 10:30:03,068 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 45 [2020-09-21 10:30:03,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:03,069 INFO L225 Difference]: With dead ends: 67 [2020-09-21 10:30:03,069 INFO L226 Difference]: Without dead ends: 47 [2020-09-21 10:30:03,070 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=504, Invalid=1302, Unknown=0, NotChecked=0, Total=1806 [2020-09-21 10:30:03,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-09-21 10:30:03,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-09-21 10:30:03,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-09-21 10:30:03,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2020-09-21 10:30:03,084 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 45 [2020-09-21 10:30:03,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:03,085 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2020-09-21 10:30:03,085 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-09-21 10:30:03,085 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2020-09-21 10:30:03,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-09-21 10:30:03,085 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:03,086 INFO L422 BasicCegarLoop]: trace histogram [20, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:03,086 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-09-21 10:30:03,086 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:03,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:03,086 INFO L82 PathProgramCache]: Analyzing trace with hash 2007966052, now seen corresponding path program 23 times [2020-09-21 10:30:03,087 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:03,088 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2050932804] [2020-09-21 10:30:03,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:03,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:03,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:03,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:03,527 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 67 proven. 210 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-09-21 10:30:03,527 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2050932804] [2020-09-21 10:30:03,527 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:03,527 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-09-21 10:30:03,528 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884283239] [2020-09-21 10:30:03,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-09-21 10:30:03,528 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:03,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-09-21 10:30:03,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2020-09-21 10:30:03,529 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 24 states. [2020-09-21 10:30:04,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:04,810 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-09-21 10:30:04,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-09-21 10:30:04,811 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2020-09-21 10:30:04,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:04,812 INFO L225 Difference]: With dead ends: 68 [2020-09-21 10:30:04,812 INFO L226 Difference]: Without dead ends: 48 [2020-09-21 10:30:04,813 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2020-09-21 10:30:04,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-09-21 10:30:04,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-09-21 10:30:04,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-09-21 10:30:04,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2020-09-21 10:30:04,821 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 46 [2020-09-21 10:30:04,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:04,821 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2020-09-21 10:30:04,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-09-21 10:30:04,821 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2020-09-21 10:30:04,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-09-21 10:30:04,822 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:04,822 INFO L422 BasicCegarLoop]: trace histogram [21, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:04,822 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-09-21 10:30:04,822 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:04,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:04,823 INFO L82 PathProgramCache]: Analyzing trace with hash 449222156, now seen corresponding path program 24 times [2020-09-21 10:30:04,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:04,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [900366246] [2020-09-21 10:30:04,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:04,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:05,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:05,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:05,271 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 70 proven. 231 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-09-21 10:30:05,272 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [900366246] [2020-09-21 10:30:05,272 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:05,272 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-09-21 10:30:05,272 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257131278] [2020-09-21 10:30:05,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-09-21 10:30:05,273 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:05,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-09-21 10:30:05,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2020-09-21 10:30:05,274 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand 25 states. [2020-09-21 10:30:06,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:06,632 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2020-09-21 10:30:06,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-09-21 10:30:06,632 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 47 [2020-09-21 10:30:06,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:06,633 INFO L225 Difference]: With dead ends: 69 [2020-09-21 10:30:06,633 INFO L226 Difference]: Without dead ends: 49 [2020-09-21 10:30:06,635 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=598, Invalid=1564, Unknown=0, NotChecked=0, Total=2162 [2020-09-21 10:30:06,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-09-21 10:30:06,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-09-21 10:30:06,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-09-21 10:30:06,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2020-09-21 10:30:06,642 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 47 [2020-09-21 10:30:06,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:06,642 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2020-09-21 10:30:06,642 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-09-21 10:30:06,642 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2020-09-21 10:30:06,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-09-21 10:30:06,643 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:06,643 INFO L422 BasicCegarLoop]: trace histogram [22, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:06,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-09-21 10:30:06,643 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:06,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:06,644 INFO L82 PathProgramCache]: Analyzing trace with hash -627198364, now seen corresponding path program 25 times [2020-09-21 10:30:06,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:06,644 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [234375213] [2020-09-21 10:30:06,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:06,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:06,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:06,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:06,724 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-09-21 10:30:06,724 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [234375213] [2020-09-21 10:30:06,725 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:30:06,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-21 10:30:06,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013586607] [2020-09-21 10:30:06,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 10:30:06,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:06,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 10:30:06,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:30:06,726 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 5 states. [2020-09-21 10:30:06,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:06,753 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-09-21 10:30:06,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 10:30:06,753 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 48 [2020-09-21 10:30:06,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:06,753 INFO L225 Difference]: With dead ends: 66 [2020-09-21 10:30:06,753 INFO L226 Difference]: Without dead ends: 0 [2020-09-21 10:30:06,754 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:30:06,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-09-21 10:30:06,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-09-21 10:30:06,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-09-21 10:30:06,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-09-21 10:30:06,755 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 48 [2020-09-21 10:30:06,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:06,755 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-09-21 10:30:06,755 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 10:30:06,755 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-09-21 10:30:06,755 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-09-21 10:30:06,756 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-09-21 10:30:06,758 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-09-21 10:30:07,108 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 12 [2020-09-21 10:30:07,113 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-09-21 10:30:07,113 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-09-21 10:30:07,113 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-09-21 10:30:07,114 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-09-21 10:30:07,114 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-09-21 10:30:07,114 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-09-21 10:30:07,114 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-09-21 10:30:07,114 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-09-21 10:30:07,114 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-09-21 10:30:07,114 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-09-21 10:30:07,114 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 30) no Hoare annotation was computed. [2020-09-21 10:30:07,115 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 30) no Hoare annotation was computed. [2020-09-21 10:30:07,115 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 30) the Hoare annotation is: true [2020-09-21 10:30:07,115 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-09-21 10:30:07,115 INFO L264 CegarLoopResult]: At program point L24-2(lines 24 26) the Hoare annotation is: (= main_~k~0 4) [2020-09-21 10:30:07,116 INFO L264 CegarLoopResult]: At program point L24-3(lines 18 27) the Hoare annotation is: (or (= main_~k~0 4) (and (<= main_~i~0 0) (<= (+ main_~j~0 100) 0))) [2020-09-21 10:30:07,116 INFO L264 CegarLoopResult]: At program point L20-2(lines 20 22) the Hoare annotation is: (or (= main_~k~0 4) (<= main_~i~0 1)) [2020-09-21 10:30:07,116 INFO L268 CegarLoopResult]: For program point L20-3(lines 20 22) no Hoare annotation was computed. [2020-09-21 10:30:07,117 INFO L264 CegarLoopResult]: At program point L18-2(lines 18 27) the Hoare annotation is: (= main_~k~0 4) [2020-09-21 10:30:07,117 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-09-21 10:30:07,117 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-09-21 10:30:07,117 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-09-21 10:30:07,117 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-09-21 10:30:07,117 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-09-21 10:30:07,118 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-09-21 10:30:07,145 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.09 10:30:07 BoogieIcfgContainer [2020-09-21 10:30:07,146 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-21 10:30:07,148 INFO L168 Benchmark]: Toolchain (without parser) took 18626.35 ms. Allocated memory was 138.9 MB in the beginning and 376.4 MB in the end (delta: 237.5 MB). Free memory was 100.5 MB in the beginning and 204.0 MB in the end (delta: -103.5 MB). Peak memory consumption was 134.0 MB. Max. memory is 7.1 GB. [2020-09-21 10:30:07,149 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 138.9 MB. Free memory was 119.0 MB in the beginning and 118.8 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-21 10:30:07,149 INFO L168 Benchmark]: CACSL2BoogieTranslator took 317.74 ms. Allocated memory is still 138.9 MB. Free memory was 99.8 MB in the beginning and 90.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-09-21 10:30:07,156 INFO L168 Benchmark]: Boogie Preprocessor took 125.66 ms. Allocated memory was 138.9 MB in the beginning and 200.8 MB in the end (delta: 61.9 MB). Free memory was 90.5 MB in the beginning and 179.5 MB in the end (delta: -89.0 MB). Peak memory consumption was 11.3 MB. Max. memory is 7.1 GB. [2020-09-21 10:30:07,156 INFO L168 Benchmark]: RCFGBuilder took 282.41 ms. Allocated memory is still 200.8 MB. Free memory was 178.8 MB in the beginning and 166.3 MB in the end (delta: 12.5 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. [2020-09-21 10:30:07,162 INFO L168 Benchmark]: TraceAbstraction took 17890.53 ms. Allocated memory was 200.8 MB in the beginning and 376.4 MB in the end (delta: 175.6 MB). Free memory was 166.3 MB in the beginning and 204.0 MB in the end (delta: -37.7 MB). Peak memory consumption was 138.0 MB. Max. memory is 7.1 GB. [2020-09-21 10:30:07,166 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 138.9 MB. Free memory was 119.0 MB in the beginning and 118.8 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 317.74 ms. Allocated memory is still 138.9 MB. Free memory was 99.8 MB in the beginning and 90.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 125.66 ms. Allocated memory was 138.9 MB in the beginning and 200.8 MB in the end (delta: 61.9 MB). Free memory was 90.5 MB in the beginning and 179.5 MB in the end (delta: -89.0 MB). Peak memory consumption was 11.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 282.41 ms. Allocated memory is still 200.8 MB. Free memory was 178.8 MB in the beginning and 166.3 MB in the end (delta: 12.5 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 17890.53 ms. Allocated memory was 200.8 MB in the beginning and 376.4 MB in the end (delta: 175.6 MB). Free memory was 166.3 MB in the beginning and 204.0 MB in the end (delta: -37.7 MB). Peak memory consumption was 138.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: k == 4 - InvariantResult [Line: 20]: Loop Invariant Derived loop invariant: k == 4 || i <= 1 - InvariantResult [Line: 18]: Loop Invariant Derived loop invariant: k == 4 || (i <= 0 && j + 100 <= 0) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 17.4s, OverallIterations: 28, TraceHistogramMax: 22, AutomataDifference: 11.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.3s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 404 SDtfs, 15 SDslu, 3185 SDs, 0 SdLazy, 1131 SolverSat, 487 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 652 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 540 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2002 ImplicationChecksByTransitivity, 13.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49occurred in iteration=27, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 28 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 37 PreInvPairs, 73 NumberOfFragments, 31 HoareAnnotationTreeSize, 37 FomulaSimplifications, 3216 FormulaSimplificationTreeSizeReduction, 0.2s HoareSimplificationTime, 9 FomulaSimplificationsInter, 271 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 4.5s InterpolantComputationTime, 871 NumberOfCodeBlocks, 871 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 843 ConstructedInterpolants, 0 QuantifiedInterpolants, 100903 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 28 InterpolantComputations, 4 PerfectInterpolantSequences, 1512/3323 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...