/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.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-3af5e1f [2020-09-04 23:08:57,888 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 23:08:57,892 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 23:08:57,937 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 23:08:57,937 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 23:08:57,945 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 23:08:57,949 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 23:08:57,953 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 23:08:57,956 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 23:08:57,959 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 23:08:57,961 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 23:08:57,962 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 23:08:57,962 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 23:08:57,965 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 23:08:57,968 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 23:08:57,970 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 23:08:57,972 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 23:08:57,973 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 23:08:57,975 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 23:08:57,983 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 23:08:57,986 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 23:08:57,987 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 23:08:57,989 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 23:08:57,990 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 23:08:58,003 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 23:08:58,024 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 23:08:58,025 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 23:08:58,027 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 23:08:58,028 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-09-04 23:08:58,044 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 23:08:58,045 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 23:08:58,047 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 23:08:58,047 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 23:08:58,047 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 23:08:58,047 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 23:08:58,048 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 23:08:58,048 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 23:08:58,048 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 23:08:58,048 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 23:08:58,049 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 23:08:58,050 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 23:08:58,050 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 23:08:58,050 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 23:08:58,051 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 23:08:58,051 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-09-04 23:08:58,051 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 23:08:58,051 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 23:08:58,051 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 23:08:58,052 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 23:08:58,052 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-09-04 23:08:58,052 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 23:08:58,052 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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: Use separate solver for trace checks -> true [2020-09-04 23:08:58,539 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 23:08:58,559 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 23:08:58,564 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 23:08:58,565 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 23:08:58,566 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 23:08:58,567 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-09-04 23:08:58,649 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6ff1c8836/a60121ab66864f718be3b9b243309972/FLAG12320c5d8 [2020-09-04 23:08:59,193 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 23:08:59,194 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-09-04 23:08:59,203 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6ff1c8836/a60121ab66864f718be3b9b243309972/FLAG12320c5d8 [2020-09-04 23:08:59,496 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6ff1c8836/a60121ab66864f718be3b9b243309972 [2020-09-04 23:08:59,510 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 23:08:59,513 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 23:08:59,517 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 23:08:59,517 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 23:08:59,521 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 23:08:59,522 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 11:08:59" (1/1) ... [2020-09-04 23:08:59,527 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@96dec75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:08:59, skipping insertion in model container [2020-09-04 23:08:59,528 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 11:08:59" (1/1) ... [2020-09-04 23:08:59,538 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 23:08:59,569 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 23:08:59,789 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 23:08:59,798 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 23:08:59,819 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 23:08:59,835 INFO L208 MainTranslator]: Completed translation [2020-09-04 23:08:59,836 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:08:59 WrapperNode [2020-09-04 23:08:59,836 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 23:08:59,837 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 23:08:59,837 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 23:08:59,837 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 23:08:59,934 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:08:59" (1/1) ... [2020-09-04 23:08:59,934 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:08:59" (1/1) ... [2020-09-04 23:08:59,945 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:08:59" (1/1) ... [2020-09-04 23:08:59,946 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:08:59" (1/1) ... [2020-09-04 23:08:59,954 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:08:59" (1/1) ... [2020-09-04 23:08:59,962 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:08:59" (1/1) ... [2020-09-04 23:08:59,964 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:08:59" (1/1) ... [2020-09-04 23:08:59,967 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 23:08:59,967 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 23:08:59,967 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 23:08:59,968 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 23:08:59,969 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:08:59" (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 [2020-09-04 23:09:00,046 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 23:09:00,046 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 23:09:00,047 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-04 23:09:00,047 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-09-04 23:09:00,047 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 23:09:00,047 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 23:09:00,047 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-04 23:09:00,047 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-09-04 23:09:00,047 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-09-04 23:09:00,048 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-09-04 23:09:00,048 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-09-04 23:09:00,048 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-09-04 23:09:00,048 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 23:09:00,048 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-04 23:09:00,049 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-09-04 23:09:00,049 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-04 23:09:00,049 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 23:09:00,049 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 23:09:00,360 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 23:09:00,360 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-09-04 23:09:00,367 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 11:09:00 BoogieIcfgContainer [2020-09-04 23:09:00,367 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 23:09:00,368 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 23:09:00,368 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 23:09:00,373 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 23:09:00,374 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 11:08:59" (1/3) ... [2020-09-04 23:09:00,375 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ac50fad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 11:09:00, skipping insertion in model container [2020-09-04 23:09:00,375 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:08:59" (2/3) ... [2020-09-04 23:09:00,375 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ac50fad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 11:09:00, skipping insertion in model container [2020-09-04 23:09:00,376 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 11:09:00" (3/3) ... [2020-09-04 23:09:00,378 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-09-04 23:09:00,392 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-04 23:09:00,404 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 23:09:00,429 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 23:09:00,458 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 23:09:00,459 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 23:09:00,459 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-04 23:09:00,459 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 23:09:00,459 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 23:09:00,459 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 23:09:00,460 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 23:09:00,460 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 23:09:00,483 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states. [2020-09-04 23:09:00,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-09-04 23:09:00,497 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:00,499 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:00,500 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:00,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:00,508 INFO L82 PathProgramCache]: Analyzing trace with hash -2004589429, now seen corresponding path program 1 times [2020-09-04 23:09:00,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:00,519 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [813997677] [2020-09-04 23:09:00,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:00,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:00,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:00,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:00,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:00,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:00,829 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:09:00,834 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [813997677] [2020-09-04 23:09:00,836 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 23:09:00,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-04 23:09:00,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925045254] [2020-09-04 23:09:00,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-04 23:09:00,846 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:00,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-04 23:09:00,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-04 23:09:00,868 INFO L87 Difference]: Start difference. First operand 56 states. Second operand 4 states. [2020-09-04 23:09:01,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:01,088 INFO L93 Difference]: Finished difference Result 94 states and 111 transitions. [2020-09-04 23:09:01,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-04 23:09:01,090 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 29 [2020-09-04 23:09:01,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:01,105 INFO L225 Difference]: With dead ends: 94 [2020-09-04 23:09:01,105 INFO L226 Difference]: Without dead ends: 53 [2020-09-04 23:09:01,110 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-04 23:09:01,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-09-04 23:09:01,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 49. [2020-09-04 23:09:01,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-09-04 23:09:01,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2020-09-04 23:09:01,170 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 29 [2020-09-04 23:09:01,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:01,171 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2020-09-04 23:09:01,171 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-04 23:09:01,171 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2020-09-04 23:09:01,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-09-04 23:09:01,173 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:01,173 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:01,174 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 23:09:01,174 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:01,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:01,175 INFO L82 PathProgramCache]: Analyzing trace with hash 929440641, now seen corresponding path program 1 times [2020-09-04 23:09:01,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:01,176 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1279559267] [2020-09-04 23:09:01,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:01,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:01,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:01,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:01,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:01,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:01,477 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:09:01,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1279559267] [2020-09-04 23:09:01,478 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 23:09:01,478 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-09-04 23:09:01,479 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840552245] [2020-09-04 23:09:01,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-04 23:09:01,481 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:01,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-04 23:09:01,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-09-04 23:09:01,482 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand 7 states. [2020-09-04 23:09:01,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:01,810 INFO L93 Difference]: Finished difference Result 81 states and 89 transitions. [2020-09-04 23:09:01,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-04 23:09:01,811 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 29 [2020-09-04 23:09:01,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:01,813 INFO L225 Difference]: With dead ends: 81 [2020-09-04 23:09:01,813 INFO L226 Difference]: Without dead ends: 54 [2020-09-04 23:09:01,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-09-04 23:09:01,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-09-04 23:09:01,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 50. [2020-09-04 23:09:01,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-09-04 23:09:01,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2020-09-04 23:09:01,829 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 29 [2020-09-04 23:09:01,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:01,829 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2020-09-04 23:09:01,829 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-04 23:09:01,829 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2020-09-04 23:09:01,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-09-04 23:09:01,831 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:01,831 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:01,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 23:09:01,832 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:01,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:01,832 INFO L82 PathProgramCache]: Analyzing trace with hash -300797571, now seen corresponding path program 1 times [2020-09-04 23:09:01,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:01,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [182267472] [2020-09-04 23:09:01,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:01,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:01,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:01,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:01,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:01,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:02,082 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:09:02,082 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [182267472] [2020-09-04 23:09:02,083 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:09:02,083 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-04 23:09:02,083 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488920723] [2020-09-04 23:09:02,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-04 23:09:02,084 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:02,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-04 23:09:02,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-09-04 23:09:02,085 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 9 states. [2020-09-04 23:09:02,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:02,440 INFO L93 Difference]: Finished difference Result 87 states and 95 transitions. [2020-09-04 23:09:02,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-04 23:09:02,441 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2020-09-04 23:09:02,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:02,443 INFO L225 Difference]: With dead ends: 87 [2020-09-04 23:09:02,443 INFO L226 Difference]: Without dead ends: 60 [2020-09-04 23:09:02,444 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2020-09-04 23:09:02,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-09-04 23:09:02,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 56. [2020-09-04 23:09:02,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-09-04 23:09:02,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2020-09-04 23:09:02,457 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 35 [2020-09-04 23:09:02,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:02,457 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2020-09-04 23:09:02,458 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-04 23:09:02,458 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2020-09-04 23:09:02,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-09-04 23:09:02,460 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:02,460 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:02,460 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-04 23:09:02,461 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:02,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:02,461 INFO L82 PathProgramCache]: Analyzing trace with hash -1218260359, now seen corresponding path program 2 times [2020-09-04 23:09:02,461 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:02,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2044198944] [2020-09-04 23:09:02,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:02,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:02,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:02,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:02,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:02,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:02,579 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-09-04 23:09:02,580 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2044198944] [2020-09-04 23:09:02,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 23:09:02,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 23:09:02,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298721863] [2020-09-04 23:09:02,582 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 23:09:02,582 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:02,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 23:09:02,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-04 23:09:02,583 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand 5 states. [2020-09-04 23:09:02,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:02,753 INFO L93 Difference]: Finished difference Result 86 states and 95 transitions. [2020-09-04 23:09:02,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-04 23:09:02,755 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 41 [2020-09-04 23:09:02,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:02,758 INFO L225 Difference]: With dead ends: 86 [2020-09-04 23:09:02,758 INFO L226 Difference]: Without dead ends: 71 [2020-09-04 23:09:02,761 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-04 23:09:02,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-09-04 23:09:02,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 57. [2020-09-04 23:09:02,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-09-04 23:09:02,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 61 transitions. [2020-09-04 23:09:02,797 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 61 transitions. Word has length 41 [2020-09-04 23:09:02,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:02,804 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 61 transitions. [2020-09-04 23:09:02,805 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 23:09:02,805 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 61 transitions. [2020-09-04 23:09:02,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-09-04 23:09:02,817 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:02,817 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:02,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-04 23:09:02,817 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:02,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:02,820 INFO L82 PathProgramCache]: Analyzing trace with hash -632447720, now seen corresponding path program 1 times [2020-09-04 23:09:02,820 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:02,821 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1099964676] [2020-09-04 23:09:02,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:02,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:02,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:02,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:02,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:02,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:02,957 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-09-04 23:09:02,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1099964676] [2020-09-04 23:09:02,958 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:09:02,958 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-04 23:09:02,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206085404] [2020-09-04 23:09:02,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-04 23:09:02,959 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:02,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-04 23:09:02,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-09-04 23:09:02,960 INFO L87 Difference]: Start difference. First operand 57 states and 61 transitions. Second operand 7 states. [2020-09-04 23:09:03,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:03,163 INFO L93 Difference]: Finished difference Result 95 states and 105 transitions. [2020-09-04 23:09:03,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-04 23:09:03,164 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 48 [2020-09-04 23:09:03,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:03,165 INFO L225 Difference]: With dead ends: 95 [2020-09-04 23:09:03,165 INFO L226 Difference]: Without dead ends: 80 [2020-09-04 23:09:03,166 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-09-04 23:09:03,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-09-04 23:09:03,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 66. [2020-09-04 23:09:03,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-09-04 23:09:03,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 71 transitions. [2020-09-04 23:09:03,178 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 71 transitions. Word has length 48 [2020-09-04 23:09:03,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:03,178 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 71 transitions. [2020-09-04 23:09:03,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-04 23:09:03,179 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 71 transitions. [2020-09-04 23:09:03,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-09-04 23:09:03,180 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:03,180 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:03,180 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-04 23:09:03,181 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:03,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:03,181 INFO L82 PathProgramCache]: Analyzing trace with hash -1369017959, now seen corresponding path program 2 times [2020-09-04 23:09:03,181 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:03,182 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [535031015] [2020-09-04 23:09:03,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:03,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:03,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:03,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:03,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:03,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:03,490 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:09:03,490 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [535031015] [2020-09-04 23:09:03,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:09:03,491 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-09-04 23:09:03,491 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433894339] [2020-09-04 23:09:03,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-04 23:09:03,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:03,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-04 23:09:03,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-09-04 23:09:03,493 INFO L87 Difference]: Start difference. First operand 66 states and 71 transitions. Second operand 11 states. [2020-09-04 23:09:03,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:03,965 INFO L93 Difference]: Finished difference Result 113 states and 123 transitions. [2020-09-04 23:09:03,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-04 23:09:03,967 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 55 [2020-09-04 23:09:03,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:03,968 INFO L225 Difference]: With dead ends: 113 [2020-09-04 23:09:03,969 INFO L226 Difference]: Without dead ends: 76 [2020-09-04 23:09:03,970 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=93, Invalid=249, Unknown=0, NotChecked=0, Total=342 [2020-09-04 23:09:03,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-09-04 23:09:03,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 72. [2020-09-04 23:09:03,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-09-04 23:09:03,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2020-09-04 23:09:03,980 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 55 [2020-09-04 23:09:03,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:03,980 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2020-09-04 23:09:03,980 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-04 23:09:03,980 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2020-09-04 23:09:03,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-09-04 23:09:03,981 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:03,982 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:03,982 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-04 23:09:03,982 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:03,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:03,983 INFO L82 PathProgramCache]: Analyzing trace with hash -1346847595, now seen corresponding path program 3 times [2020-09-04 23:09:03,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:03,983 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1944330802] [2020-09-04 23:09:03,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:04,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:04,037 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:04,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:04,050 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:04,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:04,379 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:09:04,379 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1944330802] [2020-09-04 23:09:04,380 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:09:04,380 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-04 23:09:04,380 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273449857] [2020-09-04 23:09:04,380 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-04 23:09:04,381 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:04,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-04 23:09:04,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2020-09-04 23:09:04,381 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand 13 states. [2020-09-04 23:09:04,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:04,820 INFO L93 Difference]: Finished difference Result 119 states and 129 transitions. [2020-09-04 23:09:04,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-09-04 23:09:04,821 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2020-09-04 23:09:04,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:04,822 INFO L225 Difference]: With dead ends: 119 [2020-09-04 23:09:04,822 INFO L226 Difference]: Without dead ends: 82 [2020-09-04 23:09:04,823 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=137, Invalid=369, Unknown=0, NotChecked=0, Total=506 [2020-09-04 23:09:04,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-09-04 23:09:04,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 78. [2020-09-04 23:09:04,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-09-04 23:09:04,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 83 transitions. [2020-09-04 23:09:04,851 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 83 transitions. Word has length 61 [2020-09-04 23:09:04,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:04,852 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 83 transitions. [2020-09-04 23:09:04,852 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-04 23:09:04,852 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 83 transitions. [2020-09-04 23:09:04,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-09-04 23:09:04,856 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:04,856 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:04,857 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-04 23:09:04,857 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:04,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:04,857 INFO L82 PathProgramCache]: Analyzing trace with hash -1957832047, now seen corresponding path program 4 times [2020-09-04 23:09:04,858 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:04,858 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [81172439] [2020-09-04 23:09:04,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:04,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:04,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:04,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:04,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:04,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:05,381 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:09:05,381 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [81172439] [2020-09-04 23:09:05,381 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:09:05,381 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-09-04 23:09:05,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946799494] [2020-09-04 23:09:05,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-09-04 23:09:05,382 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:05,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-09-04 23:09:05,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=158, Unknown=0, NotChecked=0, Total=210 [2020-09-04 23:09:05,383 INFO L87 Difference]: Start difference. First operand 78 states and 83 transitions. Second operand 15 states. [2020-09-04 23:09:05,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:05,974 INFO L93 Difference]: Finished difference Result 125 states and 135 transitions. [2020-09-04 23:09:05,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-09-04 23:09:05,975 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 67 [2020-09-04 23:09:05,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:05,976 INFO L225 Difference]: With dead ends: 125 [2020-09-04 23:09:05,977 INFO L226 Difference]: Without dead ends: 88 [2020-09-04 23:09:05,978 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=191, Invalid=511, Unknown=0, NotChecked=0, Total=702 [2020-09-04 23:09:05,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-09-04 23:09:05,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 84. [2020-09-04 23:09:05,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-09-04 23:09:05,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 89 transitions. [2020-09-04 23:09:05,992 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 89 transitions. Word has length 67 [2020-09-04 23:09:05,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:05,993 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 89 transitions. [2020-09-04 23:09:05,993 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-09-04 23:09:05,993 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 89 transitions. [2020-09-04 23:09:05,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-09-04 23:09:05,996 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:05,997 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:05,997 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-04 23:09:05,997 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:05,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:05,998 INFO L82 PathProgramCache]: Analyzing trace with hash -897873011, now seen corresponding path program 5 times [2020-09-04 23:09:05,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:05,998 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [86736626] [2020-09-04 23:09:05,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:06,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:06,060 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:06,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:06,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:06,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:06,637 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:09:06,637 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [86736626] [2020-09-04 23:09:06,637 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:09:06,637 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-09-04 23:09:06,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375796886] [2020-09-04 23:09:06,638 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-09-04 23:09:06,638 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:06,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-09-04 23:09:06,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=205, Unknown=0, NotChecked=0, Total=272 [2020-09-04 23:09:06,639 INFO L87 Difference]: Start difference. First operand 84 states and 89 transitions. Second operand 17 states. [2020-09-04 23:09:07,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:07,297 INFO L93 Difference]: Finished difference Result 131 states and 141 transitions. [2020-09-04 23:09:07,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-09-04 23:09:07,298 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 73 [2020-09-04 23:09:07,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:07,299 INFO L225 Difference]: With dead ends: 131 [2020-09-04 23:09:07,299 INFO L226 Difference]: Without dead ends: 94 [2020-09-04 23:09:07,300 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=255, Invalid=675, Unknown=0, NotChecked=0, Total=930 [2020-09-04 23:09:07,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-09-04 23:09:07,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 90. [2020-09-04 23:09:07,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-09-04 23:09:07,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 95 transitions. [2020-09-04 23:09:07,311 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 95 transitions. Word has length 73 [2020-09-04 23:09:07,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:07,311 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 95 transitions. [2020-09-04 23:09:07,312 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-09-04 23:09:07,312 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 95 transitions. [2020-09-04 23:09:07,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-09-04 23:09:07,313 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:07,313 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:07,313 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-04 23:09:07,314 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:07,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:07,314 INFO L82 PathProgramCache]: Analyzing trace with hash -1891135607, now seen corresponding path program 6 times [2020-09-04 23:09:07,314 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:07,314 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [470463566] [2020-09-04 23:09:07,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:07,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:07,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:07,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:07,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:07,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:07,967 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 96 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:09:07,968 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [470463566] [2020-09-04 23:09:07,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:09:07,968 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-09-04 23:09:07,968 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956006761] [2020-09-04 23:09:07,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-09-04 23:09:07,969 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:07,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-09-04 23:09:07,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=258, Unknown=0, NotChecked=0, Total=342 [2020-09-04 23:09:07,969 INFO L87 Difference]: Start difference. First operand 90 states and 95 transitions. Second operand 19 states. [2020-09-04 23:09:08,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:08,851 INFO L93 Difference]: Finished difference Result 137 states and 147 transitions. [2020-09-04 23:09:08,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-09-04 23:09:08,851 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 79 [2020-09-04 23:09:08,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:08,853 INFO L225 Difference]: With dead ends: 137 [2020-09-04 23:09:08,853 INFO L226 Difference]: Without dead ends: 100 [2020-09-04 23:09:08,854 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=329, Invalid=861, Unknown=0, NotChecked=0, Total=1190 [2020-09-04 23:09:08,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-09-04 23:09:08,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 96. [2020-09-04 23:09:08,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-09-04 23:09:08,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 101 transitions. [2020-09-04 23:09:08,866 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 101 transitions. Word has length 79 [2020-09-04 23:09:08,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:08,866 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 101 transitions. [2020-09-04 23:09:08,866 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-09-04 23:09:08,866 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 101 transitions. [2020-09-04 23:09:08,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-09-04 23:09:08,867 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:08,868 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:08,868 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-04 23:09:08,868 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:08,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:08,869 INFO L82 PathProgramCache]: Analyzing trace with hash 1348970117, now seen corresponding path program 7 times [2020-09-04 23:09:08,869 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:08,869 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2106248341] [2020-09-04 23:09:08,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:08,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:08,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:08,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:08,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:08,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:09,680 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 0 proven. 133 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:09:09,681 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2106248341] [2020-09-04 23:09:09,681 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:09:09,691 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-09-04 23:09:09,692 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824523004] [2020-09-04 23:09:09,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-09-04 23:09:09,693 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:09,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-09-04 23:09:09,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=317, Unknown=0, NotChecked=0, Total=420 [2020-09-04 23:09:09,695 INFO L87 Difference]: Start difference. First operand 96 states and 101 transitions. Second operand 21 states. [2020-09-04 23:09:10,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:10,617 INFO L93 Difference]: Finished difference Result 143 states and 153 transitions. [2020-09-04 23:09:10,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-09-04 23:09:10,618 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 85 [2020-09-04 23:09:10,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:10,619 INFO L225 Difference]: With dead ends: 143 [2020-09-04 23:09:10,619 INFO L226 Difference]: Without dead ends: 106 [2020-09-04 23:09:10,625 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=413, Invalid=1069, Unknown=0, NotChecked=0, Total=1482 [2020-09-04 23:09:10,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-09-04 23:09:10,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 102. [2020-09-04 23:09:10,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-09-04 23:09:10,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 107 transitions. [2020-09-04 23:09:10,644 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 107 transitions. Word has length 85 [2020-09-04 23:09:10,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:10,644 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 107 transitions. [2020-09-04 23:09:10,644 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-09-04 23:09:10,644 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 107 transitions. [2020-09-04 23:09:10,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-09-04 23:09:10,645 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:10,646 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:10,646 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-04 23:09:10,646 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:10,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:10,647 INFO L82 PathProgramCache]: Analyzing trace with hash -1790865279, now seen corresponding path program 8 times [2020-09-04 23:09:10,647 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:10,647 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [272741605] [2020-09-04 23:09:10,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:10,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:10,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:10,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:10,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:10,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:11,555 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 0 proven. 176 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:09:11,555 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [272741605] [2020-09-04 23:09:11,556 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:09:11,556 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-09-04 23:09:11,556 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561589946] [2020-09-04 23:09:11,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-09-04 23:09:11,557 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:11,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-09-04 23:09:11,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=382, Unknown=0, NotChecked=0, Total=506 [2020-09-04 23:09:11,557 INFO L87 Difference]: Start difference. First operand 102 states and 107 transitions. Second operand 23 states. [2020-09-04 23:09:12,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:12,713 INFO L93 Difference]: Finished difference Result 149 states and 159 transitions. [2020-09-04 23:09:12,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-09-04 23:09:12,713 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 91 [2020-09-04 23:09:12,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:12,714 INFO L225 Difference]: With dead ends: 149 [2020-09-04 23:09:12,715 INFO L226 Difference]: Without dead ends: 112 [2020-09-04 23:09:12,722 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 291 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=507, Invalid=1299, Unknown=0, NotChecked=0, Total=1806 [2020-09-04 23:09:12,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-09-04 23:09:12,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 108. [2020-09-04 23:09:12,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-09-04 23:09:12,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 113 transitions. [2020-09-04 23:09:12,745 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 113 transitions. Word has length 91 [2020-09-04 23:09:12,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:12,745 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 113 transitions. [2020-09-04 23:09:12,745 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-09-04 23:09:12,746 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 113 transitions. [2020-09-04 23:09:12,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-09-04 23:09:12,747 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:12,747 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:12,747 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-09-04 23:09:12,748 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:12,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:12,748 INFO L82 PathProgramCache]: Analyzing trace with hash -1309995651, now seen corresponding path program 9 times [2020-09-04 23:09:12,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:12,748 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1690982462] [2020-09-04 23:09:12,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:12,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:12,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:12,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:12,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:12,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:13,930 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:09:13,931 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1690982462] [2020-09-04 23:09:13,931 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:09:13,931 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-09-04 23:09:13,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274631843] [2020-09-04 23:09:13,932 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-09-04 23:09:13,932 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:13,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-09-04 23:09:13,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=453, Unknown=0, NotChecked=0, Total=600 [2020-09-04 23:09:13,933 INFO L87 Difference]: Start difference. First operand 108 states and 113 transitions. Second operand 25 states. [2020-09-04 23:09:15,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:15,312 INFO L93 Difference]: Finished difference Result 155 states and 165 transitions. [2020-09-04 23:09:15,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-09-04 23:09:15,312 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 97 [2020-09-04 23:09:15,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:15,314 INFO L225 Difference]: With dead ends: 155 [2020-09-04 23:09:15,314 INFO L226 Difference]: Without dead ends: 118 [2020-09-04 23:09:15,316 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=611, Invalid=1551, Unknown=0, NotChecked=0, Total=2162 [2020-09-04 23:09:15,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-09-04 23:09:15,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 114. [2020-09-04 23:09:15,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2020-09-04 23:09:15,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 119 transitions. [2020-09-04 23:09:15,330 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 119 transitions. Word has length 97 [2020-09-04 23:09:15,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:15,331 INFO L479 AbstractCegarLoop]: Abstraction has 114 states and 119 transitions. [2020-09-04 23:09:15,331 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-09-04 23:09:15,331 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 119 transitions. [2020-09-04 23:09:15,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-09-04 23:09:15,332 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:15,332 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:15,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-09-04 23:09:15,332 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:15,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:15,333 INFO L82 PathProgramCache]: Analyzing trace with hash -2094408327, now seen corresponding path program 10 times [2020-09-04 23:09:15,333 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:15,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1563678323] [2020-09-04 23:09:15,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:15,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:15,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:15,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:15,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:15,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:16,566 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 280 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:09:16,567 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1563678323] [2020-09-04 23:09:16,567 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:09:16,567 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-09-04 23:09:16,567 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107592490] [2020-09-04 23:09:16,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-09-04 23:09:16,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:16,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-09-04 23:09:16,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=530, Unknown=0, NotChecked=0, Total=702 [2020-09-04 23:09:16,569 INFO L87 Difference]: Start difference. First operand 114 states and 119 transitions. Second operand 27 states. [2020-09-04 23:09:17,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:17,908 INFO L93 Difference]: Finished difference Result 161 states and 171 transitions. [2020-09-04 23:09:17,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-09-04 23:09:17,909 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 103 [2020-09-04 23:09:17,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:17,911 INFO L225 Difference]: With dead ends: 161 [2020-09-04 23:09:17,911 INFO L226 Difference]: Without dead ends: 124 [2020-09-04 23:09:17,913 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 423 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=725, Invalid=1825, Unknown=0, NotChecked=0, Total=2550 [2020-09-04 23:09:17,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-09-04 23:09:17,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 120. [2020-09-04 23:09:17,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-09-04 23:09:17,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 125 transitions. [2020-09-04 23:09:17,929 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 125 transitions. Word has length 103 [2020-09-04 23:09:17,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:17,929 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 125 transitions. [2020-09-04 23:09:17,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-09-04 23:09:17,929 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 125 transitions. [2020-09-04 23:09:17,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-09-04 23:09:17,931 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:17,931 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:17,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-09-04 23:09:17,931 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:17,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:17,932 INFO L82 PathProgramCache]: Analyzing trace with hash 712228981, now seen corresponding path program 11 times [2020-09-04 23:09:17,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:17,933 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [626956503] [2020-09-04 23:09:17,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:17,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:18,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:18,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:18,035 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:18,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:19,382 INFO L134 CoverageAnalysis]: Checked inductivity of 350 backedges. 0 proven. 341 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:09:19,382 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [626956503] [2020-09-04 23:09:19,382 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:09:19,383 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-09-04 23:09:19,383 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1841082151] [2020-09-04 23:09:19,383 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-09-04 23:09:19,383 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:19,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-09-04 23:09:19,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=613, Unknown=0, NotChecked=0, Total=812 [2020-09-04 23:09:19,384 INFO L87 Difference]: Start difference. First operand 120 states and 125 transitions. Second operand 29 states. [2020-09-04 23:09:20,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:20,952 INFO L93 Difference]: Finished difference Result 167 states and 177 transitions. [2020-09-04 23:09:20,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-09-04 23:09:20,953 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 109 [2020-09-04 23:09:20,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:20,955 INFO L225 Difference]: With dead ends: 167 [2020-09-04 23:09:20,955 INFO L226 Difference]: Without dead ends: 130 [2020-09-04 23:09:20,956 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 498 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=849, Invalid=2121, Unknown=0, NotChecked=0, Total=2970 [2020-09-04 23:09:20,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-09-04 23:09:20,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 126. [2020-09-04 23:09:20,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2020-09-04 23:09:20,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 131 transitions. [2020-09-04 23:09:20,970 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 131 transitions. Word has length 109 [2020-09-04 23:09:20,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:20,970 INFO L479 AbstractCegarLoop]: Abstraction has 126 states and 131 transitions. [2020-09-04 23:09:20,971 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-09-04 23:09:20,971 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 131 transitions. [2020-09-04 23:09:20,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2020-09-04 23:09:20,972 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:20,972 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:20,972 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-09-04 23:09:20,973 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:20,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:20,973 INFO L82 PathProgramCache]: Analyzing trace with hash -907118991, now seen corresponding path program 12 times [2020-09-04 23:09:20,973 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:20,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [777718693] [2020-09-04 23:09:20,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:21,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:21,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:21,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:21,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:21,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:22,455 INFO L134 CoverageAnalysis]: Checked inductivity of 417 backedges. 0 proven. 408 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:09:22,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [777718693] [2020-09-04 23:09:22,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:09:22,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-09-04 23:09:22,456 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451290088] [2020-09-04 23:09:22,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-09-04 23:09:22,456 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:22,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-09-04 23:09:22,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=228, Invalid=702, Unknown=0, NotChecked=0, Total=930 [2020-09-04 23:09:22,457 INFO L87 Difference]: Start difference. First operand 126 states and 131 transitions. Second operand 31 states. [2020-09-04 23:09:24,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:24,129 INFO L93 Difference]: Finished difference Result 173 states and 183 transitions. [2020-09-04 23:09:24,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-09-04 23:09:24,129 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 115 [2020-09-04 23:09:24,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:24,130 INFO L225 Difference]: With dead ends: 173 [2020-09-04 23:09:24,131 INFO L226 Difference]: Without dead ends: 136 [2020-09-04 23:09:24,133 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 579 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=983, Invalid=2439, Unknown=0, NotChecked=0, Total=3422 [2020-09-04 23:09:24,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-09-04 23:09:24,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 132. [2020-09-04 23:09:24,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2020-09-04 23:09:24,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 137 transitions. [2020-09-04 23:09:24,149 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 137 transitions. Word has length 115 [2020-09-04 23:09:24,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:24,149 INFO L479 AbstractCegarLoop]: Abstraction has 132 states and 137 transitions. [2020-09-04 23:09:24,149 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-09-04 23:09:24,150 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 137 transitions. [2020-09-04 23:09:24,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-09-04 23:09:24,151 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:24,151 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:24,151 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-09-04 23:09:24,152 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:24,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:24,152 INFO L82 PathProgramCache]: Analyzing trace with hash 1081065325, now seen corresponding path program 13 times [2020-09-04 23:09:24,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:24,152 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [537012661] [2020-09-04 23:09:24,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:24,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:24,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:24,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:24,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:24,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:25,842 INFO L134 CoverageAnalysis]: Checked inductivity of 490 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:09:25,843 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [537012661] [2020-09-04 23:09:25,844 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:09:25,844 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-09-04 23:09:25,844 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826719313] [2020-09-04 23:09:25,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-09-04 23:09:25,845 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:25,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-09-04 23:09:25,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=797, Unknown=0, NotChecked=0, Total=1056 [2020-09-04 23:09:25,846 INFO L87 Difference]: Start difference. First operand 132 states and 137 transitions. Second operand 33 states. [2020-09-04 23:09:27,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:27,808 INFO L93 Difference]: Finished difference Result 179 states and 189 transitions. [2020-09-04 23:09:27,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-09-04 23:09:27,808 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 121 [2020-09-04 23:09:27,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:27,811 INFO L225 Difference]: With dead ends: 179 [2020-09-04 23:09:27,811 INFO L226 Difference]: Without dead ends: 142 [2020-09-04 23:09:27,813 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 666 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1127, Invalid=2779, Unknown=0, NotChecked=0, Total=3906 [2020-09-04 23:09:27,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2020-09-04 23:09:27,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 138. [2020-09-04 23:09:27,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2020-09-04 23:09:27,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 143 transitions. [2020-09-04 23:09:27,828 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 143 transitions. Word has length 121 [2020-09-04 23:09:27,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:27,829 INFO L479 AbstractCegarLoop]: Abstraction has 138 states and 143 transitions. [2020-09-04 23:09:27,829 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-09-04 23:09:27,829 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 143 transitions. [2020-09-04 23:09:27,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-09-04 23:09:27,830 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:27,830 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 14, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:27,831 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-09-04 23:09:27,831 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:27,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:27,831 INFO L82 PathProgramCache]: Analyzing trace with hash -444769431, now seen corresponding path program 14 times [2020-09-04 23:09:27,831 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:27,832 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1923413216] [2020-09-04 23:09:27,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:27,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:27,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:27,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:27,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:27,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:29,677 INFO L134 CoverageAnalysis]: Checked inductivity of 569 backedges. 0 proven. 560 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:09:29,677 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1923413216] [2020-09-04 23:09:29,678 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:09:29,678 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-09-04 23:09:29,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72504376] [2020-09-04 23:09:29,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-09-04 23:09:29,679 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:29,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-09-04 23:09:29,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=292, Invalid=898, Unknown=0, NotChecked=0, Total=1190 [2020-09-04 23:09:29,680 INFO L87 Difference]: Start difference. First operand 138 states and 143 transitions. Second operand 35 states. [2020-09-04 23:09:31,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:31,773 INFO L93 Difference]: Finished difference Result 185 states and 195 transitions. [2020-09-04 23:09:31,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-09-04 23:09:31,774 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 127 [2020-09-04 23:09:31,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:31,776 INFO L225 Difference]: With dead ends: 185 [2020-09-04 23:09:31,776 INFO L226 Difference]: Without dead ends: 148 [2020-09-04 23:09:31,778 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 759 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1281, Invalid=3141, Unknown=0, NotChecked=0, Total=4422 [2020-09-04 23:09:31,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2020-09-04 23:09:31,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 144. [2020-09-04 23:09:31,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-09-04 23:09:31,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 149 transitions. [2020-09-04 23:09:31,794 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 149 transitions. Word has length 127 [2020-09-04 23:09:31,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:31,795 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 149 transitions. [2020-09-04 23:09:31,795 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-09-04 23:09:31,795 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 149 transitions. [2020-09-04 23:09:31,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-09-04 23:09:31,796 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:31,796 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 15, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:31,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-09-04 23:09:31,797 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:31,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:31,797 INFO L82 PathProgramCache]: Analyzing trace with hash 1162676837, now seen corresponding path program 15 times [2020-09-04 23:09:31,797 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:31,798 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1607230905] [2020-09-04 23:09:31,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:31,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:31,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:31,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:31,909 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:31,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:33,855 INFO L134 CoverageAnalysis]: Checked inductivity of 654 backedges. 0 proven. 645 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:09:33,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1607230905] [2020-09-04 23:09:33,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:09:33,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-09-04 23:09:33,855 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [784093788] [2020-09-04 23:09:33,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-09-04 23:09:33,856 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:33,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-09-04 23:09:33,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=1005, Unknown=0, NotChecked=0, Total=1332 [2020-09-04 23:09:33,857 INFO L87 Difference]: Start difference. First operand 144 states and 149 transitions. Second operand 37 states. [2020-09-04 23:09:36,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:36,088 INFO L93 Difference]: Finished difference Result 191 states and 201 transitions. [2020-09-04 23:09:36,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-09-04 23:09:36,088 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 133 [2020-09-04 23:09:36,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:36,090 INFO L225 Difference]: With dead ends: 191 [2020-09-04 23:09:36,090 INFO L226 Difference]: Without dead ends: 154 [2020-09-04 23:09:36,093 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 858 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=1445, Invalid=3525, Unknown=0, NotChecked=0, Total=4970 [2020-09-04 23:09:36,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-09-04 23:09:36,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 150. [2020-09-04 23:09:36,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-09-04 23:09:36,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 155 transitions. [2020-09-04 23:09:36,121 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 155 transitions. Word has length 133 [2020-09-04 23:09:36,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:36,122 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 155 transitions. [2020-09-04 23:09:36,122 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-09-04 23:09:36,122 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 155 transitions. [2020-09-04 23:09:36,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2020-09-04 23:09:36,124 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:36,125 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 16, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:36,125 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-09-04 23:09:36,125 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:36,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:36,126 INFO L82 PathProgramCache]: Analyzing trace with hash -591098783, now seen corresponding path program 16 times [2020-09-04 23:09:36,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:36,126 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1426708947] [2020-09-04 23:09:36,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:36,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:36,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:36,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:36,254 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:36,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:38,592 INFO L134 CoverageAnalysis]: Checked inductivity of 745 backedges. 0 proven. 736 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:09:38,592 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1426708947] [2020-09-04 23:09:38,593 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:09:38,593 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-09-04 23:09:38,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36333274] [2020-09-04 23:09:38,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-09-04 23:09:38,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:38,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-09-04 23:09:38,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=1118, Unknown=0, NotChecked=0, Total=1482 [2020-09-04 23:09:38,599 INFO L87 Difference]: Start difference. First operand 150 states and 155 transitions. Second operand 39 states. [2020-09-04 23:09:41,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:41,030 INFO L93 Difference]: Finished difference Result 197 states and 207 transitions. [2020-09-04 23:09:41,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-09-04 23:09:41,030 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 139 [2020-09-04 23:09:41,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:41,032 INFO L225 Difference]: With dead ends: 197 [2020-09-04 23:09:41,032 INFO L226 Difference]: Without dead ends: 160 [2020-09-04 23:09:41,035 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 963 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1619, Invalid=3931, Unknown=0, NotChecked=0, Total=5550 [2020-09-04 23:09:41,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2020-09-04 23:09:41,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 156. [2020-09-04 23:09:41,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-09-04 23:09:41,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 161 transitions. [2020-09-04 23:09:41,051 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 161 transitions. Word has length 139 [2020-09-04 23:09:41,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:41,052 INFO L479 AbstractCegarLoop]: Abstraction has 156 states and 161 transitions. [2020-09-04 23:09:41,052 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-09-04 23:09:41,052 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 161 transitions. [2020-09-04 23:09:41,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-09-04 23:09:41,054 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:41,054 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 17, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:41,054 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-09-04 23:09:41,061 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:41,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:41,061 INFO L82 PathProgramCache]: Analyzing trace with hash -713449123, now seen corresponding path program 17 times [2020-09-04 23:09:41,061 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:41,062 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [74205655] [2020-09-04 23:09:41,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:41,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:41,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:41,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:41,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:41,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:43,537 INFO L134 CoverageAnalysis]: Checked inductivity of 842 backedges. 0 proven. 833 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:09:43,538 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [74205655] [2020-09-04 23:09:43,538 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:09:43,538 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-09-04 23:09:43,538 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235435623] [2020-09-04 23:09:43,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-09-04 23:09:43,539 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:43,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-09-04 23:09:43,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=403, Invalid=1237, Unknown=0, NotChecked=0, Total=1640 [2020-09-04 23:09:43,540 INFO L87 Difference]: Start difference. First operand 156 states and 161 transitions. Second operand 41 states. [2020-09-04 23:09:46,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:46,327 INFO L93 Difference]: Finished difference Result 203 states and 213 transitions. [2020-09-04 23:09:46,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-09-04 23:09:46,328 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 145 [2020-09-04 23:09:46,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:46,329 INFO L225 Difference]: With dead ends: 203 [2020-09-04 23:09:46,329 INFO L226 Difference]: Without dead ends: 166 [2020-09-04 23:09:46,331 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1074 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=1803, Invalid=4359, Unknown=0, NotChecked=0, Total=6162 [2020-09-04 23:09:46,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2020-09-04 23:09:46,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 162. [2020-09-04 23:09:46,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2020-09-04 23:09:46,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 167 transitions. [2020-09-04 23:09:46,349 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 167 transitions. Word has length 145 [2020-09-04 23:09:46,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:46,349 INFO L479 AbstractCegarLoop]: Abstraction has 162 states and 167 transitions. [2020-09-04 23:09:46,350 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-09-04 23:09:46,350 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 167 transitions. [2020-09-04 23:09:46,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2020-09-04 23:09:46,351 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:46,351 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 18, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:46,351 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-09-04 23:09:46,351 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:46,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:46,352 INFO L82 PathProgramCache]: Analyzing trace with hash -1045296807, now seen corresponding path program 18 times [2020-09-04 23:09:46,352 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:46,352 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2061826166] [2020-09-04 23:09:46,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:46,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:46,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:46,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:46,461 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:46,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:49,137 INFO L134 CoverageAnalysis]: Checked inductivity of 945 backedges. 0 proven. 936 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:09:49,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2061826166] [2020-09-04 23:09:49,137 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:09:49,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-09-04 23:09:49,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812266539] [2020-09-04 23:09:49,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-09-04 23:09:49,138 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:49,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-09-04 23:09:49,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=444, Invalid=1362, Unknown=0, NotChecked=0, Total=1806 [2020-09-04 23:09:49,139 INFO L87 Difference]: Start difference. First operand 162 states and 167 transitions. Second operand 43 states. [2020-09-04 23:09:52,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:52,265 INFO L93 Difference]: Finished difference Result 209 states and 219 transitions. [2020-09-04 23:09:52,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2020-09-04 23:09:52,267 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 151 [2020-09-04 23:09:52,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:52,269 INFO L225 Difference]: With dead ends: 209 [2020-09-04 23:09:52,269 INFO L226 Difference]: Without dead ends: 172 [2020-09-04 23:09:52,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1191 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=1997, Invalid=4809, Unknown=0, NotChecked=0, Total=6806 [2020-09-04 23:09:52,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2020-09-04 23:09:52,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 168. [2020-09-04 23:09:52,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2020-09-04 23:09:52,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 173 transitions. [2020-09-04 23:09:52,288 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 173 transitions. Word has length 151 [2020-09-04 23:09:52,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:52,288 INFO L479 AbstractCegarLoop]: Abstraction has 168 states and 173 transitions. [2020-09-04 23:09:52,288 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-09-04 23:09:52,288 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 173 transitions. [2020-09-04 23:09:52,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2020-09-04 23:09:52,289 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:52,290 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 19, 19, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:52,290 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-09-04 23:09:52,290 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:52,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:52,290 INFO L82 PathProgramCache]: Analyzing trace with hash 1482916949, now seen corresponding path program 19 times [2020-09-04 23:09:52,290 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:52,291 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [673579326] [2020-09-04 23:09:52,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:52,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:52,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:52,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:52,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:52,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:55,205 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 0 proven. 1045 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:09:55,206 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [673579326] [2020-09-04 23:09:55,206 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:09:55,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-09-04 23:09:55,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431319268] [2020-09-04 23:09:55,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-09-04 23:09:55,207 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:09:55,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-09-04 23:09:55,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=487, Invalid=1493, Unknown=0, NotChecked=0, Total=1980 [2020-09-04 23:09:55,208 INFO L87 Difference]: Start difference. First operand 168 states and 173 transitions. Second operand 45 states. [2020-09-04 23:09:58,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:09:58,283 INFO L93 Difference]: Finished difference Result 215 states and 225 transitions. [2020-09-04 23:09:58,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2020-09-04 23:09:58,284 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 157 [2020-09-04 23:09:58,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:09:58,285 INFO L225 Difference]: With dead ends: 215 [2020-09-04 23:09:58,286 INFO L226 Difference]: Without dead ends: 178 [2020-09-04 23:09:58,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1314 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=2201, Invalid=5281, Unknown=0, NotChecked=0, Total=7482 [2020-09-04 23:09:58,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-09-04 23:09:58,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 174. [2020-09-04 23:09:58,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-09-04 23:09:58,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 179 transitions. [2020-09-04 23:09:58,313 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 179 transitions. Word has length 157 [2020-09-04 23:09:58,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:09:58,313 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 179 transitions. [2020-09-04 23:09:58,313 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-09-04 23:09:58,313 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 179 transitions. [2020-09-04 23:09:58,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2020-09-04 23:09:58,314 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:09:58,315 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 20, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:09:58,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-09-04 23:09:58,315 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:09:58,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:09:58,315 INFO L82 PathProgramCache]: Analyzing trace with hash 825479761, now seen corresponding path program 20 times [2020-09-04 23:09:58,315 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:09:58,315 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1811463439] [2020-09-04 23:09:58,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:09:58,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:58,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:09:58,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:09:58,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:09:58,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:01,586 INFO L134 CoverageAnalysis]: Checked inductivity of 1169 backedges. 0 proven. 1160 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:10:01,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1811463439] [2020-09-04 23:10:01,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:01,586 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-09-04 23:10:01,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183530518] [2020-09-04 23:10:01,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-09-04 23:10:01,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:01,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-09-04 23:10:01,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=532, Invalid=1630, Unknown=0, NotChecked=0, Total=2162 [2020-09-04 23:10:01,587 INFO L87 Difference]: Start difference. First operand 174 states and 179 transitions. Second operand 47 states. [2020-09-04 23:10:05,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:05,248 INFO L93 Difference]: Finished difference Result 221 states and 231 transitions. [2020-09-04 23:10:05,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2020-09-04 23:10:05,249 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 163 [2020-09-04 23:10:05,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:05,251 INFO L225 Difference]: With dead ends: 221 [2020-09-04 23:10:05,251 INFO L226 Difference]: Without dead ends: 184 [2020-09-04 23:10:05,252 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1443 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=2415, Invalid=5775, Unknown=0, NotChecked=0, Total=8190 [2020-09-04 23:10:05,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2020-09-04 23:10:05,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 180. [2020-09-04 23:10:05,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2020-09-04 23:10:05,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 185 transitions. [2020-09-04 23:10:05,277 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 185 transitions. Word has length 163 [2020-09-04 23:10:05,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:05,278 INFO L479 AbstractCegarLoop]: Abstraction has 180 states and 185 transitions. [2020-09-04 23:10:05,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-09-04 23:10:05,278 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 185 transitions. [2020-09-04 23:10:05,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2020-09-04 23:10:05,279 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:05,279 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 21, 21, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:10:05,279 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-09-04 23:10:05,279 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:05,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:05,280 INFO L82 PathProgramCache]: Analyzing trace with hash -2139573427, now seen corresponding path program 21 times [2020-09-04 23:10:05,280 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:05,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [986234710] [2020-09-04 23:10:05,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:05,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:05,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:05,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:05,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:10:05,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:08,749 INFO L134 CoverageAnalysis]: Checked inductivity of 1290 backedges. 0 proven. 1281 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:10:08,750 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [986234710] [2020-09-04 23:10:08,750 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:08,750 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-09-04 23:10:08,750 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544223490] [2020-09-04 23:10:08,751 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-09-04 23:10:08,751 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:08,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-09-04 23:10:08,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=579, Invalid=1773, Unknown=0, NotChecked=0, Total=2352 [2020-09-04 23:10:08,751 INFO L87 Difference]: Start difference. First operand 180 states and 185 transitions. Second operand 49 states. [2020-09-04 23:10:12,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:12,485 INFO L93 Difference]: Finished difference Result 227 states and 237 transitions. [2020-09-04 23:10:12,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2020-09-04 23:10:12,485 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 169 [2020-09-04 23:10:12,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:12,487 INFO L225 Difference]: With dead ends: 227 [2020-09-04 23:10:12,487 INFO L226 Difference]: Without dead ends: 190 [2020-09-04 23:10:12,489 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1578 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=2639, Invalid=6291, Unknown=0, NotChecked=0, Total=8930 [2020-09-04 23:10:12,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2020-09-04 23:10:12,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 186. [2020-09-04 23:10:12,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2020-09-04 23:10:12,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 191 transitions. [2020-09-04 23:10:12,508 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 191 transitions. Word has length 169 [2020-09-04 23:10:12,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:12,508 INFO L479 AbstractCegarLoop]: Abstraction has 186 states and 191 transitions. [2020-09-04 23:10:12,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-09-04 23:10:12,508 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 191 transitions. [2020-09-04 23:10:12,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2020-09-04 23:10:12,509 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:12,509 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 22, 22, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:10:12,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-09-04 23:10:12,509 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:12,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:12,509 INFO L82 PathProgramCache]: Analyzing trace with hash -751311031, now seen corresponding path program 22 times [2020-09-04 23:10:12,510 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:12,510 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2020979060] [2020-09-04 23:10:12,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:12,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:12,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:12,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:12,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:10:12,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:16,230 INFO L134 CoverageAnalysis]: Checked inductivity of 1417 backedges. 0 proven. 1408 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:10:16,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2020979060] [2020-09-04 23:10:16,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:16,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-09-04 23:10:16,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613112830] [2020-09-04 23:10:16,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-09-04 23:10:16,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:16,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-09-04 23:10:16,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=628, Invalid=1922, Unknown=0, NotChecked=0, Total=2550 [2020-09-04 23:10:16,233 INFO L87 Difference]: Start difference. First operand 186 states and 191 transitions. Second operand 51 states. [2020-09-04 23:10:20,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:20,177 INFO L93 Difference]: Finished difference Result 233 states and 243 transitions. [2020-09-04 23:10:20,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2020-09-04 23:10:20,178 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 175 [2020-09-04 23:10:20,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:20,179 INFO L225 Difference]: With dead ends: 233 [2020-09-04 23:10:20,180 INFO L226 Difference]: Without dead ends: 196 [2020-09-04 23:10:20,181 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1719 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=2873, Invalid=6829, Unknown=0, NotChecked=0, Total=9702 [2020-09-04 23:10:20,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2020-09-04 23:10:20,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 192. [2020-09-04 23:10:20,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-09-04 23:10:20,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 197 transitions. [2020-09-04 23:10:20,203 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 197 transitions. Word has length 175 [2020-09-04 23:10:20,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:20,204 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 197 transitions. [2020-09-04 23:10:20,204 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-09-04 23:10:20,204 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 197 transitions. [2020-09-04 23:10:20,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2020-09-04 23:10:20,206 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:20,206 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 23, 23, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:10:20,206 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-09-04 23:10:20,206 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:20,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:20,207 INFO L82 PathProgramCache]: Analyzing trace with hash -886624699, now seen corresponding path program 23 times [2020-09-04 23:10:20,207 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:20,207 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1180390194] [2020-09-04 23:10:20,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:20,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:20,325 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:20,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:20,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:10:20,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:24,150 INFO L134 CoverageAnalysis]: Checked inductivity of 1550 backedges. 0 proven. 1541 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:10:24,150 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1180390194] [2020-09-04 23:10:24,150 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:24,150 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-09-04 23:10:24,150 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247997621] [2020-09-04 23:10:24,151 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-09-04 23:10:24,151 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:24,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-09-04 23:10:24,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=679, Invalid=2077, Unknown=0, NotChecked=0, Total=2756 [2020-09-04 23:10:24,152 INFO L87 Difference]: Start difference. First operand 192 states and 197 transitions. Second operand 53 states. [2020-09-04 23:10:28,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:28,393 INFO L93 Difference]: Finished difference Result 239 states and 249 transitions. [2020-09-04 23:10:28,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2020-09-04 23:10:28,394 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 181 [2020-09-04 23:10:28,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:28,395 INFO L225 Difference]: With dead ends: 239 [2020-09-04 23:10:28,395 INFO L226 Difference]: Without dead ends: 202 [2020-09-04 23:10:28,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1866 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=3117, Invalid=7389, Unknown=0, NotChecked=0, Total=10506 [2020-09-04 23:10:28,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-09-04 23:10:28,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 198. [2020-09-04 23:10:28,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2020-09-04 23:10:28,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 203 transitions. [2020-09-04 23:10:28,417 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 203 transitions. Word has length 181 [2020-09-04 23:10:28,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:28,418 INFO L479 AbstractCegarLoop]: Abstraction has 198 states and 203 transitions. [2020-09-04 23:10:28,418 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-09-04 23:10:28,418 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 203 transitions. [2020-09-04 23:10:28,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2020-09-04 23:10:28,419 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:28,419 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 24, 24, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:10:28,419 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-09-04 23:10:28,419 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:28,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:28,420 INFO L82 PathProgramCache]: Analyzing trace with hash -626243519, now seen corresponding path program 24 times [2020-09-04 23:10:28,420 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:28,420 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [5386399] [2020-09-04 23:10:28,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:28,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:28,541 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:28,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:28,556 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:10:28,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:32,718 INFO L134 CoverageAnalysis]: Checked inductivity of 1689 backedges. 0 proven. 1680 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:10:32,718 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [5386399] [2020-09-04 23:10:32,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:32,719 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-09-04 23:10:32,719 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365985774] [2020-09-04 23:10:32,719 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-09-04 23:10:32,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:32,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-09-04 23:10:32,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=732, Invalid=2238, Unknown=0, NotChecked=0, Total=2970 [2020-09-04 23:10:32,720 INFO L87 Difference]: Start difference. First operand 198 states and 203 transitions. Second operand 55 states. [2020-09-04 23:10:37,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:37,218 INFO L93 Difference]: Finished difference Result 245 states and 255 transitions. [2020-09-04 23:10:37,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2020-09-04 23:10:37,222 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 187 [2020-09-04 23:10:37,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:37,224 INFO L225 Difference]: With dead ends: 245 [2020-09-04 23:10:37,224 INFO L226 Difference]: Without dead ends: 208 [2020-09-04 23:10:37,226 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2019 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=3371, Invalid=7971, Unknown=0, NotChecked=0, Total=11342 [2020-09-04 23:10:37,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-09-04 23:10:37,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 204. [2020-09-04 23:10:37,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-09-04 23:10:37,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 209 transitions. [2020-09-04 23:10:37,258 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 209 transitions. Word has length 187 [2020-09-04 23:10:37,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:37,258 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 209 transitions. [2020-09-04 23:10:37,258 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-09-04 23:10:37,258 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 209 transitions. [2020-09-04 23:10:37,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2020-09-04 23:10:37,260 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:37,260 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 25, 25, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:10:37,260 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-09-04 23:10:37,260 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:37,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:37,261 INFO L82 PathProgramCache]: Analyzing trace with hash 14480701, now seen corresponding path program 25 times [2020-09-04 23:10:37,261 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:37,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1506392654] [2020-09-04 23:10:37,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:37,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:37,386 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:37,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:37,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:10:37,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:41,958 INFO L134 CoverageAnalysis]: Checked inductivity of 1834 backedges. 0 proven. 1825 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:10:41,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1506392654] [2020-09-04 23:10:41,958 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:41,958 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-09-04 23:10:41,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152931485] [2020-09-04 23:10:41,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-09-04 23:10:41,959 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:41,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-09-04 23:10:41,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=787, Invalid=2405, Unknown=0, NotChecked=0, Total=3192 [2020-09-04 23:10:41,960 INFO L87 Difference]: Start difference. First operand 204 states and 209 transitions. Second operand 57 states. [2020-09-04 23:10:46,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:46,905 INFO L93 Difference]: Finished difference Result 251 states and 261 transitions. [2020-09-04 23:10:46,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2020-09-04 23:10:46,905 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 193 [2020-09-04 23:10:46,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:46,907 INFO L225 Difference]: With dead ends: 251 [2020-09-04 23:10:46,907 INFO L226 Difference]: Without dead ends: 214 [2020-09-04 23:10:46,908 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2178 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=3635, Invalid=8575, Unknown=0, NotChecked=0, Total=12210 [2020-09-04 23:10:46,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2020-09-04 23:10:46,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 210. [2020-09-04 23:10:46,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2020-09-04 23:10:46,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 215 transitions. [2020-09-04 23:10:46,938 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 215 transitions. Word has length 193 [2020-09-04 23:10:46,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:46,939 INFO L479 AbstractCegarLoop]: Abstraction has 210 states and 215 transitions. [2020-09-04 23:10:46,939 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-09-04 23:10:46,939 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 215 transitions. [2020-09-04 23:10:46,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-09-04 23:10:46,941 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:46,941 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 26, 26, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:10:46,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-09-04 23:10:46,941 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:46,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:46,942 INFO L82 PathProgramCache]: Analyzing trace with hash -2055277255, now seen corresponding path program 26 times [2020-09-04 23:10:46,942 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:46,942 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2128560291] [2020-09-04 23:10:46,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:46,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:47,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:47,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:47,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:10:47,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:52,007 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 0 proven. 1976 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:10:52,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2128560291] [2020-09-04 23:10:52,007 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:52,007 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-09-04 23:10:52,007 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097850947] [2020-09-04 23:10:52,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-09-04 23:10:52,008 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:52,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-09-04 23:10:52,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=844, Invalid=2578, Unknown=0, NotChecked=0, Total=3422 [2020-09-04 23:10:52,009 INFO L87 Difference]: Start difference. First operand 210 states and 215 transitions. Second operand 59 states. [2020-09-04 23:10:57,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:57,407 INFO L93 Difference]: Finished difference Result 257 states and 267 transitions. [2020-09-04 23:10:57,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2020-09-04 23:10:57,408 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 199 [2020-09-04 23:10:57,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:57,410 INFO L225 Difference]: With dead ends: 257 [2020-09-04 23:10:57,410 INFO L226 Difference]: Without dead ends: 220 [2020-09-04 23:10:57,411 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2343 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=3909, Invalid=9201, Unknown=0, NotChecked=0, Total=13110 [2020-09-04 23:10:57,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2020-09-04 23:10:57,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 216. [2020-09-04 23:10:57,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2020-09-04 23:10:57,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 221 transitions. [2020-09-04 23:10:57,445 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 221 transitions. Word has length 199 [2020-09-04 23:10:57,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:57,446 INFO L479 AbstractCegarLoop]: Abstraction has 216 states and 221 transitions. [2020-09-04 23:10:57,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-09-04 23:10:57,446 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 221 transitions. [2020-09-04 23:10:57,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2020-09-04 23:10:57,447 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:57,448 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 27, 27, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:10:57,448 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-09-04 23:10:57,448 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:57,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:57,448 INFO L82 PathProgramCache]: Analyzing trace with hash -1257764811, now seen corresponding path program 27 times [2020-09-04 23:10:57,449 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:57,449 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1538676111] [2020-09-04 23:10:57,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:57,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:57,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:57,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:57,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:10:57,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:02,740 INFO L134 CoverageAnalysis]: Checked inductivity of 2142 backedges. 0 proven. 2133 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:11:02,740 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1538676111] [2020-09-04 23:11:02,740 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:02,740 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-09-04 23:11:02,741 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223057300] [2020-09-04 23:11:02,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-09-04 23:11:02,741 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:02,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-09-04 23:11:02,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=2757, Unknown=0, NotChecked=0, Total=3660 [2020-09-04 23:11:02,742 INFO L87 Difference]: Start difference. First operand 216 states and 221 transitions. Second operand 61 states. [2020-09-04 23:11:08,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:08,455 INFO L93 Difference]: Finished difference Result 263 states and 273 transitions. [2020-09-04 23:11:08,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2020-09-04 23:11:08,456 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 205 [2020-09-04 23:11:08,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:08,458 INFO L225 Difference]: With dead ends: 263 [2020-09-04 23:11:08,458 INFO L226 Difference]: Without dead ends: 226 [2020-09-04 23:11:08,460 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2514 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=4193, Invalid=9849, Unknown=0, NotChecked=0, Total=14042 [2020-09-04 23:11:08,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2020-09-04 23:11:08,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 222. [2020-09-04 23:11:08,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2020-09-04 23:11:08,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 227 transitions. [2020-09-04 23:11:08,491 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 227 transitions. Word has length 205 [2020-09-04 23:11:08,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:08,492 INFO L479 AbstractCegarLoop]: Abstraction has 222 states and 227 transitions. [2020-09-04 23:11:08,492 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-09-04 23:11:08,492 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 227 transitions. [2020-09-04 23:11:08,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2020-09-04 23:11:08,493 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:08,493 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 28, 28, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:11:08,495 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-09-04 23:11:08,495 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:08,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:08,495 INFO L82 PathProgramCache]: Analyzing trace with hash -1667371471, now seen corresponding path program 28 times [2020-09-04 23:11:08,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:08,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [541494477] [2020-09-04 23:11:08,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:08,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:08,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:08,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:08,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:11:08,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:14,324 INFO L134 CoverageAnalysis]: Checked inductivity of 2305 backedges. 0 proven. 2296 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:11:14,325 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [541494477] [2020-09-04 23:11:14,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:14,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63] total 63 [2020-09-04 23:11:14,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200845149] [2020-09-04 23:11:14,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2020-09-04 23:11:14,326 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:14,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2020-09-04 23:11:14,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=964, Invalid=2942, Unknown=0, NotChecked=0, Total=3906 [2020-09-04 23:11:14,327 INFO L87 Difference]: Start difference. First operand 222 states and 227 transitions. Second operand 63 states. [2020-09-04 23:11:20,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:20,543 INFO L93 Difference]: Finished difference Result 269 states and 279 transitions. [2020-09-04 23:11:20,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2020-09-04 23:11:20,545 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 211 [2020-09-04 23:11:20,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:20,547 INFO L225 Difference]: With dead ends: 269 [2020-09-04 23:11:20,547 INFO L226 Difference]: Without dead ends: 232 [2020-09-04 23:11:20,549 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2691 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=4487, Invalid=10519, Unknown=0, NotChecked=0, Total=15006 [2020-09-04 23:11:20,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2020-09-04 23:11:20,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 228. [2020-09-04 23:11:20,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 228 states. [2020-09-04 23:11:20,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 233 transitions. [2020-09-04 23:11:20,582 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 233 transitions. Word has length 211 [2020-09-04 23:11:20,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:20,583 INFO L479 AbstractCegarLoop]: Abstraction has 228 states and 233 transitions. [2020-09-04 23:11:20,583 INFO L480 AbstractCegarLoop]: Interpolant automaton has 63 states. [2020-09-04 23:11:20,583 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 233 transitions. [2020-09-04 23:11:20,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2020-09-04 23:11:20,584 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:20,584 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 29, 29, 29, 29, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:11:20,585 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-09-04 23:11:20,585 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:20,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:20,585 INFO L82 PathProgramCache]: Analyzing trace with hash -971610323, now seen corresponding path program 29 times [2020-09-04 23:11:20,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:20,586 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1622755989] [2020-09-04 23:11:20,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:20,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:20,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:20,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:20,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:11:20,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:26,697 INFO L134 CoverageAnalysis]: Checked inductivity of 2474 backedges. 0 proven. 2465 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:11:26,698 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1622755989] [2020-09-04 23:11:26,698 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:26,698 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65] total 65 [2020-09-04 23:11:26,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996860476] [2020-09-04 23:11:26,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-09-04 23:11:26,699 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:26,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-09-04 23:11:26,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1027, Invalid=3133, Unknown=0, NotChecked=0, Total=4160 [2020-09-04 23:11:26,699 INFO L87 Difference]: Start difference. First operand 228 states and 233 transitions. Second operand 65 states. [2020-09-04 23:11:33,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:33,290 INFO L93 Difference]: Finished difference Result 275 states and 285 transitions. [2020-09-04 23:11:33,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-09-04 23:11:33,290 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 217 [2020-09-04 23:11:33,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:33,292 INFO L225 Difference]: With dead ends: 275 [2020-09-04 23:11:33,292 INFO L226 Difference]: Without dead ends: 238 [2020-09-04 23:11:33,294 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2874 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=4791, Invalid=11211, Unknown=0, NotChecked=0, Total=16002 [2020-09-04 23:11:33,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2020-09-04 23:11:33,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 234. [2020-09-04 23:11:33,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 234 states. [2020-09-04 23:11:33,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 239 transitions. [2020-09-04 23:11:33,332 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 239 transitions. Word has length 217 [2020-09-04 23:11:33,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:33,332 INFO L479 AbstractCegarLoop]: Abstraction has 234 states and 239 transitions. [2020-09-04 23:11:33,332 INFO L480 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-09-04 23:11:33,332 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 239 transitions. [2020-09-04 23:11:33,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 224 [2020-09-04 23:11:33,334 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:33,334 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 30, 30, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:11:33,334 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-09-04 23:11:33,334 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:33,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:33,335 INFO L82 PathProgramCache]: Analyzing trace with hash -201903319, now seen corresponding path program 30 times [2020-09-04 23:11:33,335 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:33,335 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [169594738] [2020-09-04 23:11:33,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:33,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:33,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:33,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:33,492 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:11:33,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:39,974 INFO L134 CoverageAnalysis]: Checked inductivity of 2649 backedges. 0 proven. 2640 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:11:39,974 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [169594738] [2020-09-04 23:11:39,974 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:39,974 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67] total 67 [2020-09-04 23:11:39,974 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084800225] [2020-09-04 23:11:39,975 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2020-09-04 23:11:39,975 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:39,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2020-09-04 23:11:39,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1092, Invalid=3330, Unknown=0, NotChecked=0, Total=4422 [2020-09-04 23:11:39,975 INFO L87 Difference]: Start difference. First operand 234 states and 239 transitions. Second operand 67 states. [2020-09-04 23:11:47,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:47,126 INFO L93 Difference]: Finished difference Result 281 states and 291 transitions. [2020-09-04 23:11:47,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2020-09-04 23:11:47,127 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 223 [2020-09-04 23:11:47,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:47,129 INFO L225 Difference]: With dead ends: 281 [2020-09-04 23:11:47,130 INFO L226 Difference]: Without dead ends: 244 [2020-09-04 23:11:47,131 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3063 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=5105, Invalid=11925, Unknown=0, NotChecked=0, Total=17030 [2020-09-04 23:11:47,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2020-09-04 23:11:47,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 240. [2020-09-04 23:11:47,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2020-09-04 23:11:47,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 245 transitions. [2020-09-04 23:11:47,176 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 245 transitions. Word has length 223 [2020-09-04 23:11:47,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:47,176 INFO L479 AbstractCegarLoop]: Abstraction has 240 states and 245 transitions. [2020-09-04 23:11:47,176 INFO L480 AbstractCegarLoop]: Interpolant automaton has 67 states. [2020-09-04 23:11:47,176 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 245 transitions. [2020-09-04 23:11:47,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2020-09-04 23:11:47,178 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:47,178 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 31, 31, 31, 31, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:11:47,178 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-09-04 23:11:47,178 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:47,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:47,179 INFO L82 PathProgramCache]: Analyzing trace with hash -579464667, now seen corresponding path program 31 times [2020-09-04 23:11:47,179 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:47,179 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [419427159] [2020-09-04 23:11:47,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:47,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:47,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:47,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:47,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:11:47,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:54,403 INFO L134 CoverageAnalysis]: Checked inductivity of 2830 backedges. 0 proven. 2821 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:11:54,404 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [419427159] [2020-09-04 23:11:54,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:54,404 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69] total 69 [2020-09-04 23:11:54,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31643091] [2020-09-04 23:11:54,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2020-09-04 23:11:54,405 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:54,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2020-09-04 23:11:54,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1159, Invalid=3533, Unknown=0, NotChecked=0, Total=4692 [2020-09-04 23:11:54,406 INFO L87 Difference]: Start difference. First operand 240 states and 245 transitions. Second operand 69 states. [2020-09-04 23:12:02,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:12:02,077 INFO L93 Difference]: Finished difference Result 287 states and 297 transitions. [2020-09-04 23:12:02,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2020-09-04 23:12:02,078 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 229 [2020-09-04 23:12:02,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:12:02,080 INFO L225 Difference]: With dead ends: 287 [2020-09-04 23:12:02,080 INFO L226 Difference]: Without dead ends: 250 [2020-09-04 23:12:02,081 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3258 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=5429, Invalid=12661, Unknown=0, NotChecked=0, Total=18090 [2020-09-04 23:12:02,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-09-04 23:12:02,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 246. [2020-09-04 23:12:02,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 246 states. [2020-09-04 23:12:02,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 251 transitions. [2020-09-04 23:12:02,115 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 251 transitions. Word has length 229 [2020-09-04 23:12:02,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:12:02,116 INFO L479 AbstractCegarLoop]: Abstraction has 246 states and 251 transitions. [2020-09-04 23:12:02,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 69 states. [2020-09-04 23:12:02,116 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 251 transitions. [2020-09-04 23:12:02,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 236 [2020-09-04 23:12:02,117 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:12:02,118 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 32, 32, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:12:02,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-09-04 23:12:02,118 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:12:02,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:12:02,118 INFO L82 PathProgramCache]: Analyzing trace with hash -361184223, now seen corresponding path program 32 times [2020-09-04 23:12:02,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:12:02,119 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1926776195] [2020-09-04 23:12:02,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:12:02,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:02,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:12:02,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:02,274 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:12:02,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:09,790 INFO L134 CoverageAnalysis]: Checked inductivity of 3017 backedges. 0 proven. 3008 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:12:09,790 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1926776195] [2020-09-04 23:12:09,790 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:12:09,790 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71] total 71 [2020-09-04 23:12:09,791 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018738251] [2020-09-04 23:12:09,791 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2020-09-04 23:12:09,791 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:12:09,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2020-09-04 23:12:09,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1228, Invalid=3742, Unknown=0, NotChecked=0, Total=4970 [2020-09-04 23:12:09,792 INFO L87 Difference]: Start difference. First operand 246 states and 251 transitions. Second operand 71 states. [2020-09-04 23:12:18,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:12:18,672 INFO L93 Difference]: Finished difference Result 293 states and 303 transitions. [2020-09-04 23:12:18,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2020-09-04 23:12:18,673 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 235 [2020-09-04 23:12:18,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:12:18,676 INFO L225 Difference]: With dead ends: 293 [2020-09-04 23:12:18,676 INFO L226 Difference]: Without dead ends: 256 [2020-09-04 23:12:18,677 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3459 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=5763, Invalid=13419, Unknown=0, NotChecked=0, Total=19182 [2020-09-04 23:12:18,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2020-09-04 23:12:18,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 252. [2020-09-04 23:12:18,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 252 states. [2020-09-04 23:12:18,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 257 transitions. [2020-09-04 23:12:18,731 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 257 transitions. Word has length 235 [2020-09-04 23:12:18,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:12:18,732 INFO L479 AbstractCegarLoop]: Abstraction has 252 states and 257 transitions. [2020-09-04 23:12:18,732 INFO L480 AbstractCegarLoop]: Interpolant automaton has 71 states. [2020-09-04 23:12:18,732 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 257 transitions. [2020-09-04 23:12:18,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 242 [2020-09-04 23:12:18,734 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:12:18,734 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 33, 33, 33, 33, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:12:18,734 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-09-04 23:12:18,734 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:12:18,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:12:18,735 INFO L82 PathProgramCache]: Analyzing trace with hash -275445475, now seen corresponding path program 33 times [2020-09-04 23:12:18,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:12:18,735 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1559936127] [2020-09-04 23:12:18,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:12:18,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:18,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:12:18,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:18,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:12:18,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:27,028 INFO L134 CoverageAnalysis]: Checked inductivity of 3210 backedges. 0 proven. 3201 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:12:27,028 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1559936127] [2020-09-04 23:12:27,029 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:12:27,029 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73] total 73 [2020-09-04 23:12:27,029 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027969880] [2020-09-04 23:12:27,029 INFO L459 AbstractCegarLoop]: Interpolant automaton has 73 states [2020-09-04 23:12:27,029 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:12:27,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2020-09-04 23:12:27,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1299, Invalid=3957, Unknown=0, NotChecked=0, Total=5256 [2020-09-04 23:12:27,030 INFO L87 Difference]: Start difference. First operand 252 states and 257 transitions. Second operand 73 states. [2020-09-04 23:12:35,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:12:35,927 INFO L93 Difference]: Finished difference Result 299 states and 309 transitions. [2020-09-04 23:12:35,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2020-09-04 23:12:35,928 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 241 [2020-09-04 23:12:35,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:12:35,932 INFO L225 Difference]: With dead ends: 299 [2020-09-04 23:12:35,932 INFO L226 Difference]: Without dead ends: 262 [2020-09-04 23:12:35,933 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3666 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=6107, Invalid=14199, Unknown=0, NotChecked=0, Total=20306 [2020-09-04 23:12:35,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2020-09-04 23:12:35,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 258. [2020-09-04 23:12:35,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 258 states. [2020-09-04 23:12:35,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 263 transitions. [2020-09-04 23:12:35,979 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 263 transitions. Word has length 241 [2020-09-04 23:12:35,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:12:35,980 INFO L479 AbstractCegarLoop]: Abstraction has 258 states and 263 transitions. [2020-09-04 23:12:35,980 INFO L480 AbstractCegarLoop]: Interpolant automaton has 73 states. [2020-09-04 23:12:35,980 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 263 transitions. [2020-09-04 23:12:35,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2020-09-04 23:12:35,981 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:12:35,982 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 34, 34, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:12:35,982 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-09-04 23:12:35,982 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:12:35,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:12:35,982 INFO L82 PathProgramCache]: Analyzing trace with hash -368008935, now seen corresponding path program 34 times [2020-09-04 23:12:35,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:12:35,983 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1251305398] [2020-09-04 23:12:35,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:12:36,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:36,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:12:36,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:36,164 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:12:36,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:44,662 INFO L134 CoverageAnalysis]: Checked inductivity of 3409 backedges. 0 proven. 3400 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:12:44,662 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1251305398] [2020-09-04 23:12:44,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:12:44,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75] total 75 [2020-09-04 23:12:44,663 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366463430] [2020-09-04 23:12:44,663 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2020-09-04 23:12:44,664 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:12:44,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2020-09-04 23:12:44,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1372, Invalid=4178, Unknown=0, NotChecked=0, Total=5550 [2020-09-04 23:12:44,664 INFO L87 Difference]: Start difference. First operand 258 states and 263 transitions. Second operand 75 states. [2020-09-04 23:12:54,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:12:54,428 INFO L93 Difference]: Finished difference Result 305 states and 315 transitions. [2020-09-04 23:12:54,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2020-09-04 23:12:54,429 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 247 [2020-09-04 23:12:54,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:12:54,430 INFO L225 Difference]: With dead ends: 305 [2020-09-04 23:12:54,431 INFO L226 Difference]: Without dead ends: 268 [2020-09-04 23:12:54,432 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3879 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=6461, Invalid=15001, Unknown=0, NotChecked=0, Total=21462 [2020-09-04 23:12:54,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2020-09-04 23:12:54,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 264. [2020-09-04 23:12:54,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 264 states. [2020-09-04 23:12:54,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 269 transitions. [2020-09-04 23:12:54,476 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 269 transitions. Word has length 247 [2020-09-04 23:12:54,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:12:54,476 INFO L479 AbstractCegarLoop]: Abstraction has 264 states and 269 transitions. [2020-09-04 23:12:54,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 75 states. [2020-09-04 23:12:54,477 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 269 transitions. [2020-09-04 23:12:54,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 254 [2020-09-04 23:12:54,478 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:12:54,479 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 35, 35, 35, 35, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:12:54,479 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-09-04 23:12:54,479 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:12:54,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:12:54,479 INFO L82 PathProgramCache]: Analyzing trace with hash -1142862827, now seen corresponding path program 35 times [2020-09-04 23:12:54,480 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:12:54,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1853847307] [2020-09-04 23:12:54,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:12:54,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:54,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:12:54,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:54,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:12:54,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:13:03,831 INFO L134 CoverageAnalysis]: Checked inductivity of 3614 backedges. 0 proven. 3605 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:13:03,831 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1853847307] [2020-09-04 23:13:03,831 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:13:03,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [77] total 77 [2020-09-04 23:13:03,832 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [441290045] [2020-09-04 23:13:03,832 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2020-09-04 23:13:03,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:13:03,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2020-09-04 23:13:03,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1447, Invalid=4405, Unknown=0, NotChecked=0, Total=5852 [2020-09-04 23:13:03,833 INFO L87 Difference]: Start difference. First operand 264 states and 269 transitions. Second operand 77 states. [2020-09-04 23:13:14,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:13:14,287 INFO L93 Difference]: Finished difference Result 311 states and 321 transitions. [2020-09-04 23:13:14,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2020-09-04 23:13:14,289 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 253 [2020-09-04 23:13:14,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:13:14,290 INFO L225 Difference]: With dead ends: 311 [2020-09-04 23:13:14,291 INFO L226 Difference]: Without dead ends: 274 [2020-09-04 23:13:14,292 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4098 ImplicationChecksByTransitivity, 17.8s TimeCoverageRelationStatistics Valid=6825, Invalid=15825, Unknown=0, NotChecked=0, Total=22650 [2020-09-04 23:13:14,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-09-04 23:13:14,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 270. [2020-09-04 23:13:14,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 270 states. [2020-09-04 23:13:14,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 275 transitions. [2020-09-04 23:13:14,347 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 275 transitions. Word has length 253 [2020-09-04 23:13:14,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:13:14,348 INFO L479 AbstractCegarLoop]: Abstraction has 270 states and 275 transitions. [2020-09-04 23:13:14,348 INFO L480 AbstractCegarLoop]: Interpolant automaton has 77 states. [2020-09-04 23:13:14,348 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 275 transitions. [2020-09-04 23:13:14,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 260 [2020-09-04 23:13:14,350 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:13:14,350 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 36, 36, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:13:14,350 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-09-04 23:13:14,350 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:13:14,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:13:14,351 INFO L82 PathProgramCache]: Analyzing trace with hash -408106479, now seen corresponding path program 36 times [2020-09-04 23:13:14,351 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:13:14,351 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [950347594] [2020-09-04 23:13:14,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:13:14,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:13:14,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:13:14,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:13:14,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:13:14,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:13:24,919 INFO L134 CoverageAnalysis]: Checked inductivity of 3825 backedges. 0 proven. 3816 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:13:24,919 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [950347594] [2020-09-04 23:13:24,919 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:13:24,920 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [79] total 79 [2020-09-04 23:13:24,920 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235825072] [2020-09-04 23:13:24,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2020-09-04 23:13:24,920 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:13:24,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2020-09-04 23:13:24,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1524, Invalid=4638, Unknown=0, NotChecked=0, Total=6162 [2020-09-04 23:13:24,921 INFO L87 Difference]: Start difference. First operand 270 states and 275 transitions. Second operand 79 states. [2020-09-04 23:13:35,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:13:35,516 INFO L93 Difference]: Finished difference Result 317 states and 327 transitions. [2020-09-04 23:13:35,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2020-09-04 23:13:35,517 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 259 [2020-09-04 23:13:35,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:13:35,519 INFO L225 Difference]: With dead ends: 317 [2020-09-04 23:13:35,519 INFO L226 Difference]: Without dead ends: 280 [2020-09-04 23:13:35,520 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4323 ImplicationChecksByTransitivity, 19.0s TimeCoverageRelationStatistics Valid=7199, Invalid=16671, Unknown=0, NotChecked=0, Total=23870 [2020-09-04 23:13:35,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2020-09-04 23:13:35,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 276. [2020-09-04 23:13:35,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 276 states. [2020-09-04 23:13:35,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 281 transitions. [2020-09-04 23:13:35,557 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 281 transitions. Word has length 259 [2020-09-04 23:13:35,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:13:35,558 INFO L479 AbstractCegarLoop]: Abstraction has 276 states and 281 transitions. [2020-09-04 23:13:35,558 INFO L480 AbstractCegarLoop]: Interpolant automaton has 79 states. [2020-09-04 23:13:35,558 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 281 transitions. [2020-09-04 23:13:35,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2020-09-04 23:13:35,560 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:13:35,560 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 37, 37, 37, 37, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:13:35,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-09-04 23:13:35,560 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:13:35,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:13:35,561 INFO L82 PathProgramCache]: Analyzing trace with hash 1288231693, now seen corresponding path program 37 times [2020-09-04 23:13:35,561 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:13:35,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [490475061] [2020-09-04 23:13:35,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:13:35,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:13:35,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:13:35,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:13:35,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:13:35,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:13:46,575 INFO L134 CoverageAnalysis]: Checked inductivity of 4042 backedges. 0 proven. 4033 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:13:46,576 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [490475061] [2020-09-04 23:13:46,576 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:13:46,576 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [81] total 81 [2020-09-04 23:13:46,576 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85899462] [2020-09-04 23:13:46,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 81 states [2020-09-04 23:13:46,577 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:13:46,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2020-09-04 23:13:46,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1603, Invalid=4877, Unknown=0, NotChecked=0, Total=6480 [2020-09-04 23:13:46,577 INFO L87 Difference]: Start difference. First operand 276 states and 281 transitions. Second operand 81 states. [2020-09-04 23:13:58,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:13:58,672 INFO L93 Difference]: Finished difference Result 323 states and 333 transitions. [2020-09-04 23:13:58,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2020-09-04 23:13:58,673 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 265 [2020-09-04 23:13:58,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:13:58,676 INFO L225 Difference]: With dead ends: 323 [2020-09-04 23:13:58,676 INFO L226 Difference]: Without dead ends: 286 [2020-09-04 23:13:58,678 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4554 ImplicationChecksByTransitivity, 21.1s TimeCoverageRelationStatistics Valid=7583, Invalid=17539, Unknown=0, NotChecked=0, Total=25122 [2020-09-04 23:13:58,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2020-09-04 23:13:58,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 282. [2020-09-04 23:13:58,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 282 states. [2020-09-04 23:13:58,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 287 transitions. [2020-09-04 23:13:58,730 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 287 transitions. Word has length 265 [2020-09-04 23:13:58,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:13:58,731 INFO L479 AbstractCegarLoop]: Abstraction has 282 states and 287 transitions. [2020-09-04 23:13:58,731 INFO L480 AbstractCegarLoop]: Interpolant automaton has 81 states. [2020-09-04 23:13:58,731 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 287 transitions. [2020-09-04 23:13:58,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2020-09-04 23:13:58,732 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:13:58,733 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 38, 38, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:13:58,733 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-09-04 23:13:58,733 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:13:58,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:13:58,733 INFO L82 PathProgramCache]: Analyzing trace with hash -482656503, now seen corresponding path program 38 times [2020-09-04 23:13:58,734 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:13:58,734 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1800532578] [2020-09-04 23:13:58,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:13:58,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:13:58,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:13:58,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:13:58,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:13:58,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:14:10,051 INFO L134 CoverageAnalysis]: Checked inductivity of 4265 backedges. 0 proven. 4256 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:14:10,051 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1800532578] [2020-09-04 23:14:10,051 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:14:10,051 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83] total 83 [2020-09-04 23:14:10,052 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681268957] [2020-09-04 23:14:10,052 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2020-09-04 23:14:10,052 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:14:10,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2020-09-04 23:14:10,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1684, Invalid=5122, Unknown=0, NotChecked=0, Total=6806 [2020-09-04 23:14:10,053 INFO L87 Difference]: Start difference. First operand 282 states and 287 transitions. Second operand 83 states. [2020-09-04 23:14:23,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:14:23,112 INFO L93 Difference]: Finished difference Result 329 states and 339 transitions. [2020-09-04 23:14:23,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2020-09-04 23:14:23,114 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 271 [2020-09-04 23:14:23,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:14:23,116 INFO L225 Difference]: With dead ends: 329 [2020-09-04 23:14:23,116 INFO L226 Difference]: Without dead ends: 292 [2020-09-04 23:14:23,118 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4791 ImplicationChecksByTransitivity, 21.8s TimeCoverageRelationStatistics Valid=7977, Invalid=18429, Unknown=0, NotChecked=0, Total=26406 [2020-09-04 23:14:23,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2020-09-04 23:14:23,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 288. [2020-09-04 23:14:23,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-09-04 23:14:23,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 293 transitions. [2020-09-04 23:14:23,168 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 293 transitions. Word has length 271 [2020-09-04 23:14:23,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:14:23,169 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 293 transitions. [2020-09-04 23:14:23,169 INFO L480 AbstractCegarLoop]: Interpolant automaton has 83 states. [2020-09-04 23:14:23,169 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 293 transitions. [2020-09-04 23:14:23,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 278 [2020-09-04 23:14:23,170 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:14:23,170 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 39, 39, 39, 39, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:14:23,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-09-04 23:14:23,171 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:14:23,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:14:23,171 INFO L82 PathProgramCache]: Analyzing trace with hash 2008659461, now seen corresponding path program 39 times [2020-09-04 23:14:23,171 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:14:23,172 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [51653366] [2020-09-04 23:14:23,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:14:23,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:14:23,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:14:23,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:14:23,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:14:23,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:14:24,581 WARN L193 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:14:36,084 INFO L134 CoverageAnalysis]: Checked inductivity of 4494 backedges. 0 proven. 4485 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:14:36,084 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [51653366] [2020-09-04 23:14:36,084 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:14:36,084 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [85] total 85 [2020-09-04 23:14:36,085 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889379866] [2020-09-04 23:14:36,085 INFO L459 AbstractCegarLoop]: Interpolant automaton has 85 states [2020-09-04 23:14:36,085 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:14:36,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2020-09-04 23:14:36,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1767, Invalid=5373, Unknown=0, NotChecked=0, Total=7140 [2020-09-04 23:14:36,086 INFO L87 Difference]: Start difference. First operand 288 states and 293 transitions. Second operand 85 states. [2020-09-04 23:14:49,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:14:49,037 INFO L93 Difference]: Finished difference Result 335 states and 345 transitions. [2020-09-04 23:14:49,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2020-09-04 23:14:49,039 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 277 [2020-09-04 23:14:49,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:14:49,040 INFO L225 Difference]: With dead ends: 335 [2020-09-04 23:14:49,040 INFO L226 Difference]: Without dead ends: 298 [2020-09-04 23:14:49,043 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5034 ImplicationChecksByTransitivity, 23.6s TimeCoverageRelationStatistics Valid=8381, Invalid=19341, Unknown=0, NotChecked=0, Total=27722 [2020-09-04 23:14:49,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2020-09-04 23:14:49,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 294. [2020-09-04 23:14:49,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 294 states. [2020-09-04 23:14:49,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 299 transitions. [2020-09-04 23:14:49,101 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 299 transitions. Word has length 277 [2020-09-04 23:14:49,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:14:49,103 INFO L479 AbstractCegarLoop]: Abstraction has 294 states and 299 transitions. [2020-09-04 23:14:49,103 INFO L480 AbstractCegarLoop]: Interpolant automaton has 85 states. [2020-09-04 23:14:49,103 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 299 transitions. [2020-09-04 23:14:49,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 284 [2020-09-04 23:14:49,104 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:14:49,105 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 40, 40, 40, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:14:49,105 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-09-04 23:14:49,105 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:14:49,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:14:49,105 INFO L82 PathProgramCache]: Analyzing trace with hash 1739194369, now seen corresponding path program 40 times [2020-09-04 23:14:49,106 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:14:49,106 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [422289874] [2020-09-04 23:14:49,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:14:49,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:14:49,256 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:14:49,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:14:49,276 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:14:49,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:15:02,755 INFO L134 CoverageAnalysis]: Checked inductivity of 4729 backedges. 0 proven. 4720 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:15:02,755 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [422289874] [2020-09-04 23:15:02,755 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:15:02,755 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87] total 87 [2020-09-04 23:15:02,755 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239388982] [2020-09-04 23:15:02,756 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2020-09-04 23:15:02,756 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:15:02,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2020-09-04 23:15:02,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1852, Invalid=5630, Unknown=0, NotChecked=0, Total=7482 [2020-09-04 23:15:02,757 INFO L87 Difference]: Start difference. First operand 294 states and 299 transitions. Second operand 87 states. [2020-09-04 23:15:19,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:15:19,667 INFO L93 Difference]: Finished difference Result 341 states and 351 transitions. [2020-09-04 23:15:19,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 129 states. [2020-09-04 23:15:19,669 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 283 [2020-09-04 23:15:19,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:15:19,671 INFO L225 Difference]: With dead ends: 341 [2020-09-04 23:15:19,671 INFO L226 Difference]: Without dead ends: 304 [2020-09-04 23:15:19,672 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5283 ImplicationChecksByTransitivity, 26.9s TimeCoverageRelationStatistics Valid=8795, Invalid=20275, Unknown=0, NotChecked=0, Total=29070 [2020-09-04 23:15:19,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2020-09-04 23:15:19,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 300. [2020-09-04 23:15:19,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 300 states. [2020-09-04 23:15:19,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 305 transitions. [2020-09-04 23:15:19,735 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 305 transitions. Word has length 283 [2020-09-04 23:15:19,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:15:19,736 INFO L479 AbstractCegarLoop]: Abstraction has 300 states and 305 transitions. [2020-09-04 23:15:19,736 INFO L480 AbstractCegarLoop]: Interpolant automaton has 87 states. [2020-09-04 23:15:19,736 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 305 transitions. [2020-09-04 23:15:19,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 290 [2020-09-04 23:15:19,737 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:15:19,738 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 41, 41, 41, 41, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:15:19,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-09-04 23:15:19,738 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:15:19,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:15:19,739 INFO L82 PathProgramCache]: Analyzing trace with hash 1562500349, now seen corresponding path program 41 times [2020-09-04 23:15:19,739 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:15:19,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1529843986] [2020-09-04 23:15:19,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:15:19,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:15:19,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:15:19,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:15:19,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:15:20,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:15:35,182 INFO L134 CoverageAnalysis]: Checked inductivity of 4970 backedges. 0 proven. 4961 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:15:35,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1529843986] [2020-09-04 23:15:35,183 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:15:35,183 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [89] total 89 [2020-09-04 23:15:35,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917049722] [2020-09-04 23:15:35,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2020-09-04 23:15:35,183 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:15:35,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2020-09-04 23:15:35,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1939, Invalid=5893, Unknown=0, NotChecked=0, Total=7832 [2020-09-04 23:15:35,184 INFO L87 Difference]: Start difference. First operand 300 states and 305 transitions. Second operand 89 states. [2020-09-04 23:15:53,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:15:53,584 INFO L93 Difference]: Finished difference Result 347 states and 357 transitions. [2020-09-04 23:15:53,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2020-09-04 23:15:53,586 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 289 [2020-09-04 23:15:53,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:15:53,588 INFO L225 Difference]: With dead ends: 347 [2020-09-04 23:15:53,588 INFO L226 Difference]: Without dead ends: 310 [2020-09-04 23:15:53,590 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5538 ImplicationChecksByTransitivity, 29.9s TimeCoverageRelationStatistics Valid=9219, Invalid=21231, Unknown=0, NotChecked=0, Total=30450 [2020-09-04 23:15:53,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2020-09-04 23:15:53,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 306. [2020-09-04 23:15:53,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 306 states. [2020-09-04 23:15:53,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 311 transitions. [2020-09-04 23:15:53,655 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 311 transitions. Word has length 289 [2020-09-04 23:15:53,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:15:53,655 INFO L479 AbstractCegarLoop]: Abstraction has 306 states and 311 transitions. [2020-09-04 23:15:53,656 INFO L480 AbstractCegarLoop]: Interpolant automaton has 89 states. [2020-09-04 23:15:53,656 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 311 transitions. [2020-09-04 23:15:53,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 296 [2020-09-04 23:15:53,657 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:15:53,657 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 42, 42, 42, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:15:53,658 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-09-04 23:15:53,658 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:15:53,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:15:53,658 INFO L82 PathProgramCache]: Analyzing trace with hash 182914297, now seen corresponding path program 42 times [2020-09-04 23:15:53,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:15:53,659 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1018329563] [2020-09-04 23:15:53,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:15:53,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:15:53,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:15:53,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:15:53,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:15:53,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:16:09,518 INFO L134 CoverageAnalysis]: Checked inductivity of 5217 backedges. 0 proven. 5208 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:16:09,518 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1018329563] [2020-09-04 23:16:09,518 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:16:09,518 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [91] total 91 [2020-09-04 23:16:09,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903120130] [2020-09-04 23:16:09,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2020-09-04 23:16:09,519 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:16:09,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2020-09-04 23:16:09,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2028, Invalid=6162, Unknown=0, NotChecked=0, Total=8190 [2020-09-04 23:16:09,520 INFO L87 Difference]: Start difference. First operand 306 states and 311 transitions. Second operand 91 states. [2020-09-04 23:16:26,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:16:26,689 INFO L93 Difference]: Finished difference Result 353 states and 363 transitions. [2020-09-04 23:16:26,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2020-09-04 23:16:26,691 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 295 [2020-09-04 23:16:26,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:16:26,693 INFO L225 Difference]: With dead ends: 353 [2020-09-04 23:16:26,693 INFO L226 Difference]: Without dead ends: 316 [2020-09-04 23:16:26,695 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5799 ImplicationChecksByTransitivity, 30.4s TimeCoverageRelationStatistics Valid=9653, Invalid=22209, Unknown=0, NotChecked=0, Total=31862 [2020-09-04 23:16:26,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 316 states. [2020-09-04 23:16:26,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 316 to 312. [2020-09-04 23:16:26,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 312 states. [2020-09-04 23:16:26,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 317 transitions. [2020-09-04 23:16:26,758 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 317 transitions. Word has length 295 [2020-09-04 23:16:26,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:16:26,759 INFO L479 AbstractCegarLoop]: Abstraction has 312 states and 317 transitions. [2020-09-04 23:16:26,759 INFO L480 AbstractCegarLoop]: Interpolant automaton has 91 states. [2020-09-04 23:16:26,759 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 317 transitions. [2020-09-04 23:16:26,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 302 [2020-09-04 23:16:26,761 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:16:26,761 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 43, 43, 43, 43, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:16:26,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-09-04 23:16:26,761 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:16:26,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:16:26,762 INFO L82 PathProgramCache]: Analyzing trace with hash -395358219, now seen corresponding path program 43 times [2020-09-04 23:16:26,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:16:26,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1945071602] [2020-09-04 23:16:26,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:16:26,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:16:26,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:16:26,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:16:27,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:16:27,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:16:44,094 INFO L134 CoverageAnalysis]: Checked inductivity of 5470 backedges. 0 proven. 5461 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:16:44,094 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1945071602] [2020-09-04 23:16:44,094 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:16:44,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93] total 93 [2020-09-04 23:16:44,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100471256] [2020-09-04 23:16:44,095 INFO L459 AbstractCegarLoop]: Interpolant automaton has 93 states [2020-09-04 23:16:44,095 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:16:44,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2020-09-04 23:16:44,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2119, Invalid=6437, Unknown=0, NotChecked=0, Total=8556 [2020-09-04 23:16:44,096 INFO L87 Difference]: Start difference. First operand 312 states and 317 transitions. Second operand 93 states. [2020-09-04 23:17:04,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:17:04,372 INFO L93 Difference]: Finished difference Result 359 states and 369 transitions. [2020-09-04 23:17:04,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 138 states. [2020-09-04 23:17:04,375 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 301 [2020-09-04 23:17:04,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:17:04,377 INFO L225 Difference]: With dead ends: 359 [2020-09-04 23:17:04,378 INFO L226 Difference]: Without dead ends: 322 [2020-09-04 23:17:04,380 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6066 ImplicationChecksByTransitivity, 33.6s TimeCoverageRelationStatistics Valid=10097, Invalid=23209, Unknown=0, NotChecked=0, Total=33306 [2020-09-04 23:17:04,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2020-09-04 23:17:04,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 318. [2020-09-04 23:17:04,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2020-09-04 23:17:04,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 323 transitions. [2020-09-04 23:17:04,448 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 323 transitions. Word has length 301 [2020-09-04 23:17:04,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:17:04,449 INFO L479 AbstractCegarLoop]: Abstraction has 318 states and 323 transitions. [2020-09-04 23:17:04,449 INFO L480 AbstractCegarLoop]: Interpolant automaton has 93 states. [2020-09-04 23:17:04,449 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 323 transitions. [2020-09-04 23:17:04,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 308 [2020-09-04 23:17:04,451 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:17:04,451 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 44, 44, 44, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:17:04,451 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-09-04 23:17:04,451 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:17:04,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:17:04,452 INFO L82 PathProgramCache]: Analyzing trace with hash -304060943, now seen corresponding path program 44 times [2020-09-04 23:17:04,452 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:17:04,452 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1709318005] [2020-09-04 23:17:04,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:17:04,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:17:04,683 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:17:04,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:17:04,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:17:04,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:17:24,401 INFO L134 CoverageAnalysis]: Checked inductivity of 5729 backedges. 0 proven. 5720 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:17:24,402 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1709318005] [2020-09-04 23:17:24,402 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:17:24,402 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [95] total 95 [2020-09-04 23:17:24,402 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788450694] [2020-09-04 23:17:24,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2020-09-04 23:17:24,403 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:17:24,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2020-09-04 23:17:24,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2212, Invalid=6718, Unknown=0, NotChecked=0, Total=8930 [2020-09-04 23:17:24,403 INFO L87 Difference]: Start difference. First operand 318 states and 323 transitions. Second operand 95 states. [2020-09-04 23:17:47,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:17:47,466 INFO L93 Difference]: Finished difference Result 365 states and 375 transitions. [2020-09-04 23:17:47,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 141 states. [2020-09-04 23:17:47,469 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 307 [2020-09-04 23:17:47,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:17:47,471 INFO L225 Difference]: With dead ends: 365 [2020-09-04 23:17:47,472 INFO L226 Difference]: Without dead ends: 328 [2020-09-04 23:17:47,474 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6339 ImplicationChecksByTransitivity, 39.0s TimeCoverageRelationStatistics Valid=10551, Invalid=24231, Unknown=0, NotChecked=0, Total=34782 [2020-09-04 23:17:47,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2020-09-04 23:17:47,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 324. [2020-09-04 23:17:47,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 324 states. [2020-09-04 23:17:47,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 329 transitions. [2020-09-04 23:17:47,528 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 329 transitions. Word has length 307 [2020-09-04 23:17:47,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:17:47,529 INFO L479 AbstractCegarLoop]: Abstraction has 324 states and 329 transitions. [2020-09-04 23:17:47,529 INFO L480 AbstractCegarLoop]: Interpolant automaton has 95 states. [2020-09-04 23:17:47,529 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 329 transitions. [2020-09-04 23:17:47,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 314 [2020-09-04 23:17:47,530 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:17:47,531 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 45, 45, 45, 45, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:17:47,531 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-09-04 23:17:47,531 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:17:47,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:17:47,531 INFO L82 PathProgramCache]: Analyzing trace with hash 1343229677, now seen corresponding path program 45 times [2020-09-04 23:17:47,531 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:17:47,531 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [631275828] [2020-09-04 23:17:47,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:17:47,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:17:47,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:17:47,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:17:47,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:17:47,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:18:11,550 INFO L134 CoverageAnalysis]: Checked inductivity of 5994 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:18:11,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [631275828] [2020-09-04 23:18:11,551 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:18:11,551 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97] total 97 [2020-09-04 23:18:11,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321279300] [2020-09-04 23:18:11,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 97 states [2020-09-04 23:18:11,552 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:18:11,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2020-09-04 23:18:11,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2307, Invalid=7005, Unknown=0, NotChecked=0, Total=9312 [2020-09-04 23:18:11,554 INFO L87 Difference]: Start difference. First operand 324 states and 329 transitions. Second operand 97 states. [2020-09-04 23:18:40,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:18:40,032 INFO L93 Difference]: Finished difference Result 371 states and 381 transitions. [2020-09-04 23:18:40,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2020-09-04 23:18:40,035 INFO L78 Accepts]: Start accepts. Automaton has 97 states. Word has length 313 [2020-09-04 23:18:40,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:18:40,037 INFO L225 Difference]: With dead ends: 371 [2020-09-04 23:18:40,038 INFO L226 Difference]: Without dead ends: 334 [2020-09-04 23:18:40,040 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6618 ImplicationChecksByTransitivity, 47.3s TimeCoverageRelationStatistics Valid=11015, Invalid=25275, Unknown=0, NotChecked=0, Total=36290 [2020-09-04 23:18:40,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2020-09-04 23:18:40,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 330. [2020-09-04 23:18:40,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 330 states. [2020-09-04 23:18:40,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 335 transitions. [2020-09-04 23:18:40,120 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 335 transitions. Word has length 313 [2020-09-04 23:18:40,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:18:40,120 INFO L479 AbstractCegarLoop]: Abstraction has 330 states and 335 transitions. [2020-09-04 23:18:40,121 INFO L480 AbstractCegarLoop]: Interpolant automaton has 97 states. [2020-09-04 23:18:40,121 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 335 transitions. [2020-09-04 23:18:40,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 320 [2020-09-04 23:18:40,123 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:18:40,123 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 46, 46, 46, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:18:40,123 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-09-04 23:18:40,124 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:18:40,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:18:40,124 INFO L82 PathProgramCache]: Analyzing trace with hash 1015286505, now seen corresponding path program 46 times [2020-09-04 23:18:40,124 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:18:40,125 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [602258913] [2020-09-04 23:18:40,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:18:40,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:18:40,338 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:18:40,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:18:40,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:18:40,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:19:08,587 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:10,156 INFO L134 CoverageAnalysis]: Checked inductivity of 6265 backedges. 0 proven. 6256 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:19:10,156 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [602258913] [2020-09-04 23:19:10,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:19:10,157 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [99] total 99 [2020-09-04 23:19:10,157 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027272023] [2020-09-04 23:19:10,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2020-09-04 23:19:10,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:19:10,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2020-09-04 23:19:10,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2404, Invalid=7298, Unknown=0, NotChecked=0, Total=9702 [2020-09-04 23:19:10,158 INFO L87 Difference]: Start difference. First operand 330 states and 335 transitions. Second operand 99 states. [2020-09-04 23:19:43,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:19:43,343 INFO L93 Difference]: Finished difference Result 377 states and 387 transitions. [2020-09-04 23:19:43,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 147 states. [2020-09-04 23:19:43,347 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 319 [2020-09-04 23:19:43,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:19:43,349 INFO L225 Difference]: With dead ends: 377 [2020-09-04 23:19:43,349 INFO L226 Difference]: Without dead ends: 340 [2020-09-04 23:19:43,352 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6903 ImplicationChecksByTransitivity, 59.2s TimeCoverageRelationStatistics Valid=11489, Invalid=26341, Unknown=0, NotChecked=0, Total=37830 [2020-09-04 23:19:43,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2020-09-04 23:19:43,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 336. [2020-09-04 23:19:43,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 336 states. [2020-09-04 23:19:43,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 341 transitions. [2020-09-04 23:19:43,411 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 341 transitions. Word has length 319 [2020-09-04 23:19:43,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:19:43,412 INFO L479 AbstractCegarLoop]: Abstraction has 336 states and 341 transitions. [2020-09-04 23:19:43,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 99 states. [2020-09-04 23:19:43,412 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 341 transitions. [2020-09-04 23:19:43,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2020-09-04 23:19:43,414 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:19:43,415 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 47, 47, 47, 47, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:19:43,415 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-09-04 23:19:43,415 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:19:43,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:19:43,416 INFO L82 PathProgramCache]: Analyzing trace with hash -1787684379, now seen corresponding path program 47 times [2020-09-04 23:19:43,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:19:43,416 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1329059394] [2020-09-04 23:19:43,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:19:43,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:19:43,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:19:43,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:19:43,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:19:43,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:19:44,163 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:44,297 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:44,727 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:45,038 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:45,372 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:45,727 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:45,916 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:46,109 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:46,308 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:46,516 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:46,725 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:46,941 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:47,160 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:47,613 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:47,854 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:48,096 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:48,371 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:48,622 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:48,878 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:49,157 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:49,428 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:49,702 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:49,980 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:50,504 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:50,798 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:51,103 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:51,407 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:51,721 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:52,043 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:52,367 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:52,699 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:53,036 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:53,366 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:53,709 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:54,068 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:54,419 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:54,778 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:55,140 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:55,511 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:55,889 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:56,272 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:56,663 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:57,068 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:57,468 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:58,226 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:58,643 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:59,071 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:59,504 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:19:59,940 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:00,382 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:00,826 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:02,057 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:02,544 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:03,036 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:03,522 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:04,009 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:05,726 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:06,250 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:06,811 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:07,330 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:07,842 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:08,346 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:08,859 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:09,429 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:09,999 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:10,573 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:11,153 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:11,748 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:12,347 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:12,945 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:13,543 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:14,163 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:14,794 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:15,421 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:16,053 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:16,694 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:17,338 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:17,988 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:18,640 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:19,296 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:19,973 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:20,643 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:20:21,153 INFO L134 CoverageAnalysis]: Checked inductivity of 6542 backedges. 0 proven. 6533 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:20:21,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1329059394] [2020-09-04 23:20:21,154 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:20:21,154 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101] total 101 [2020-09-04 23:20:21,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123869986] [2020-09-04 23:20:21,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2020-09-04 23:20:21,155 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:20:21,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2020-09-04 23:20:21,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2503, Invalid=7597, Unknown=0, NotChecked=0, Total=10100 [2020-09-04 23:20:21,157 INFO L87 Difference]: Start difference. First operand 336 states and 341 transitions. Second operand 101 states. [2020-09-04 23:21:01,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:21:01,945 INFO L93 Difference]: Finished difference Result 383 states and 393 transitions. [2020-09-04 23:21:01,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 150 states. [2020-09-04 23:21:01,950 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 325 [2020-09-04 23:21:01,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:21:01,953 INFO L225 Difference]: With dead ends: 383 [2020-09-04 23:21:01,953 INFO L226 Difference]: Without dead ends: 346 [2020-09-04 23:21:01,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7194 ImplicationChecksByTransitivity, 74.0s TimeCoverageRelationStatistics Valid=11973, Invalid=27429, Unknown=0, NotChecked=0, Total=39402 [2020-09-04 23:21:01,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2020-09-04 23:21:02,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 342. [2020-09-04 23:21:02,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 342 states. [2020-09-04 23:21:02,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 347 transitions. [2020-09-04 23:21:02,010 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 347 transitions. Word has length 325 [2020-09-04 23:21:02,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:21:02,011 INFO L479 AbstractCegarLoop]: Abstraction has 342 states and 347 transitions. [2020-09-04 23:21:02,011 INFO L480 AbstractCegarLoop]: Interpolant automaton has 101 states. [2020-09-04 23:21:02,011 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 347 transitions. [2020-09-04 23:21:02,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 332 [2020-09-04 23:21:02,013 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:21:02,013 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 48, 48, 48, 48, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:21:02,013 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-09-04 23:21:02,013 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:21:02,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:21:02,013 INFO L82 PathProgramCache]: Analyzing trace with hash -1379927071, now seen corresponding path program 48 times [2020-09-04 23:21:02,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:21:02,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1958595204] [2020-09-04 23:21:02,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:21:02,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:21:02,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:21:02,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:21:02,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-09-04 23:21:02,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:21:02,761 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:02,909 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:03,068 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:03,229 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:03,401 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:03,589 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:03,787 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:03,988 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:04,193 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:04,407 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:04,630 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:04,851 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:05,084 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:05,327 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:05,577 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:05,827 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:06,087 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:06,351 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:06,623 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:06,895 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:07,178 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:07,466 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:07,762 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:08,061 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:08,369 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:08,692 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:09,016 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:09,340 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:09,676 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:10,013 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:10,363 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:10,713 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:11,074 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:11,439 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:11,801 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:12,180 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:12,565 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:12,956 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:13,356 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:13,751 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:14,161 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:14,570 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:14,991 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:15,426 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:15,866 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:16,304 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:16,779 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:17,233 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:17,696 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:18,165 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:18,634 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:19,114 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:19,595 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:20,089 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:20,587 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:21,107 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:21,617 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:22,149 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:23,143 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:23,695 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:24,249 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:24,813 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:25,381 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:25,959 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:26,545 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:27,105 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:27,616 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:28,158 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:28,772 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:29,396 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:30,024 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:30,663 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:31,287 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:32,765 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:33,405 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:34,096 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:34,797 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:35,467 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:36,084 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:36,737 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:37,415 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:38,119 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:38,829 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:39,580 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:40,308 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:41,051 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:41,808 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:42,565 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:43,333 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:44,106 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:44,844 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:45,635 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:46,430 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:47,240 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 12 [2020-09-04 23:21:47,818 INFO L134 CoverageAnalysis]: Checked inductivity of 6825 backedges. 0 proven. 6816 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:21:47,818 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1958595204] [2020-09-04 23:21:47,818 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:21:47,819 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [103] total 103 [2020-09-04 23:21:47,819 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37511723] [2020-09-04 23:21:47,819 INFO L459 AbstractCegarLoop]: Interpolant automaton has 103 states [2020-09-04 23:21:47,819 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:21:47,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2020-09-04 23:21:47,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2604, Invalid=7902, Unknown=0, NotChecked=0, Total=10506 [2020-09-04 23:21:47,821 INFO L87 Difference]: Start difference. First operand 342 states and 347 transitions. Second operand 103 states. [2020-09-04 23:21:49,444 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 30