/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 -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_3-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-3af5e1f [2020-09-04 17:46:11,966 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 17:46:11,970 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 17:46:12,012 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 17:46:12,013 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 17:46:12,024 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 17:46:12,026 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 17:46:12,031 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 17:46:12,034 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 17:46:12,036 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 17:46:12,039 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 17:46:12,040 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 17:46:12,040 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 17:46:12,044 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 17:46:12,046 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 17:46:12,048 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 17:46:12,050 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 17:46:12,051 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 17:46:12,053 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 17:46:12,061 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 17:46:12,064 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 17:46:12,065 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 17:46:12,066 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 17:46:12,067 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 17:46:12,070 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 17:46:12,081 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 17:46:12,082 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 17:46:12,084 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 17:46:12,085 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 17:46:12,104 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 17:46:12,104 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 17:46:12,106 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 17:46:12,106 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 17:46:12,107 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 17:46:12,107 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 17:46:12,107 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 17:46:12,107 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 17:46:12,107 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 17:46:12,108 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 17:46:12,109 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 17:46:12,109 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 17:46:12,109 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 17:46:12,109 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 17:46:12,110 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 17:46:12,110 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-09-04 17:46:12,110 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 17:46:12,111 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 17:46:12,111 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 17:46:12,111 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 17:46:12,111 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-09-04 17:46:12,111 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 17:46:12,112 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-09-04 17:46:12,520 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 17:46:12,539 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 17:46:12,543 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 17:46:12,546 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 17:46:12,546 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 17:46:12,548 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-09-04 17:46:12,618 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/951d2580a/3e88f956486f41e790986f639ddf709b/FLAGffc0e1f40 [2020-09-04 17:46:13,140 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 17:46:13,140 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-09-04 17:46:13,149 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/951d2580a/3e88f956486f41e790986f639ddf709b/FLAGffc0e1f40 [2020-09-04 17:46:13,460 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/951d2580a/3e88f956486f41e790986f639ddf709b [2020-09-04 17:46:13,472 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 17:46:13,474 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 17:46:13,475 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 17:46:13,475 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 17:46:13,480 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 17:46:13,481 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 05:46:13" (1/1) ... [2020-09-04 17:46:13,485 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@34855c0f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:13, skipping insertion in model container [2020-09-04 17:46:13,485 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 05:46:13" (1/1) ... [2020-09-04 17:46:13,494 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 17:46:13,520 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 17:46:13,726 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 17:46:13,731 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 17:46:13,755 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 17:46:13,776 INFO L208 MainTranslator]: Completed translation [2020-09-04 17:46:13,776 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:13 WrapperNode [2020-09-04 17:46:13,777 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 17:46:13,777 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 17:46:13,777 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 17:46:13,777 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 17:46:13,877 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:13" (1/1) ... [2020-09-04 17:46:13,877 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:13" (1/1) ... [2020-09-04 17:46:13,885 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:13" (1/1) ... [2020-09-04 17:46:13,885 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:13" (1/1) ... [2020-09-04 17:46:13,898 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:13" (1/1) ... [2020-09-04 17:46:13,904 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:13" (1/1) ... [2020-09-04 17:46:13,910 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:13" (1/1) ... [2020-09-04 17:46:13,912 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 17:46:13,913 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 17:46:13,913 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 17:46:13,913 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 17:46:13,914 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:13" (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 17:46:13,985 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 17:46:13,985 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 17:46:13,985 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-04 17:46:13,986 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 17:46:13,986 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 17:46:13,986 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-04 17:46:13,986 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-04 17:46:13,986 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 17:46:13,986 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-04 17:46:13,986 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-09-04 17:46:13,987 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-09-04 17:46:13,987 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-04 17:46:13,987 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 17:46:13,987 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 17:46:14,232 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 17:46:14,232 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-09-04 17:46:14,237 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 05:46:14 BoogieIcfgContainer [2020-09-04 17:46:14,238 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 17:46:14,239 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 17:46:14,239 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 17:46:14,243 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 17:46:14,243 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 05:46:13" (1/3) ... [2020-09-04 17:46:14,245 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34a9eb67 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 05:46:14, skipping insertion in model container [2020-09-04 17:46:14,245 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:46:13" (2/3) ... [2020-09-04 17:46:14,245 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34a9eb67 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 05:46:14, skipping insertion in model container [2020-09-04 17:46:14,246 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 05:46:14" (3/3) ... [2020-09-04 17:46:14,248 INFO L109 eAbstractionObserver]: Analyzing ICFG array_3-1.i [2020-09-04 17:46:14,262 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-04 17:46:14,273 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 17:46:14,322 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 17:46:14,361 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 17:46:14,362 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 17:46:14,362 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-09-04 17:46:14,362 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 17:46:14,362 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 17:46:14,363 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 17:46:14,363 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 17:46:14,363 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 17:46:14,382 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states. [2020-09-04 17:46:14,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-09-04 17:46:14,396 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:14,397 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:14,398 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:14,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:14,406 INFO L82 PathProgramCache]: Analyzing trace with hash -2145994368, now seen corresponding path program 1 times [2020-09-04 17:46:14,415 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:14,416 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1769505873] [2020-09-04 17:46:14,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:14,489 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:14,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:14,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:14,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:14,649 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 17:46:14,652 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1769505873] [2020-09-04 17:46:14,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:14,654 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-04 17:46:14,655 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660337475] [2020-09-04 17:46:14,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-04 17:46:14,662 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:14,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-04 17:46:14,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-04 17:46:14,680 INFO L87 Difference]: Start difference. First operand 39 states. Second operand 3 states. [2020-09-04 17:46:14,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:14,828 INFO L93 Difference]: Finished difference Result 61 states and 70 transitions. [2020-09-04 17:46:14,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-04 17:46:14,831 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-09-04 17:46:14,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:14,842 INFO L225 Difference]: With dead ends: 61 [2020-09-04 17:46:14,842 INFO L226 Difference]: Without dead ends: 31 [2020-09-04 17:46:14,847 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-04 17:46:14,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-09-04 17:46:14,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-09-04 17:46:14,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-09-04 17:46:14,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2020-09-04 17:46:14,899 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 17 [2020-09-04 17:46:14,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:14,899 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2020-09-04 17:46:14,900 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-04 17:46:14,900 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2020-09-04 17:46:14,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-09-04 17:46:14,901 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:14,901 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:14,902 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 17:46:14,902 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:14,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:14,903 INFO L82 PathProgramCache]: Analyzing trace with hash 2141881988, now seen corresponding path program 1 times [2020-09-04 17:46:14,903 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:14,904 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [947251503] [2020-09-04 17:46:14,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:14,906 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:14,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:14,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:14,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:15,001 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 17:46:15,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [947251503] [2020-09-04 17:46:15,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:15,003 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-04 17:46:15,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728886186] [2020-09-04 17:46:15,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-04 17:46:15,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:15,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-04 17:46:15,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-04 17:46:15,009 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 4 states. [2020-09-04 17:46:15,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:15,119 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2020-09-04 17:46:15,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-04 17:46:15,120 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2020-09-04 17:46:15,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:15,123 INFO L225 Difference]: With dead ends: 59 [2020-09-04 17:46:15,124 INFO L226 Difference]: Without dead ends: 45 [2020-09-04 17:46:15,125 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-04 17:46:15,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-09-04 17:46:15,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 36. [2020-09-04 17:46:15,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-09-04 17:46:15,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2020-09-04 17:46:15,138 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 19 [2020-09-04 17:46:15,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:15,138 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2020-09-04 17:46:15,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-04 17:46:15,139 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2020-09-04 17:46:15,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-09-04 17:46:15,140 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:15,140 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] [2020-09-04 17:46:15,140 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 17:46:15,141 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:15,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:15,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1000622251, now seen corresponding path program 1 times [2020-09-04 17:46:15,141 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:15,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [258733431] [2020-09-04 17:46:15,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:15,169 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:15,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:15,260 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:15,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:15,269 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 17:46:15,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [258733431] [2020-09-04 17:46:15,270 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:15,270 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-09-04 17:46:15,270 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912564378] [2020-09-04 17:46:15,271 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-04 17:46:15,271 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:15,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-04 17:46:15,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-09-04 17:46:15,272 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand 6 states. [2020-09-04 17:46:15,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:15,404 INFO L93 Difference]: Finished difference Result 70 states and 76 transitions. [2020-09-04 17:46:15,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-04 17:46:15,404 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 26 [2020-09-04 17:46:15,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:15,406 INFO L225 Difference]: With dead ends: 70 [2020-09-04 17:46:15,406 INFO L226 Difference]: Without dead ends: 52 [2020-09-04 17:46:15,407 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-09-04 17:46:15,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-09-04 17:46:15,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 43. [2020-09-04 17:46:15,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-09-04 17:46:15,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2020-09-04 17:46:15,418 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 26 [2020-09-04 17:46:15,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:15,418 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2020-09-04 17:46:15,418 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-04 17:46:15,419 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2020-09-04 17:46:15,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-09-04 17:46:15,420 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:15,420 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-09-04 17:46:15,420 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-04 17:46:15,421 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:15,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:15,421 INFO L82 PathProgramCache]: Analyzing trace with hash 231352676, now seen corresponding path program 2 times [2020-09-04 17:46:15,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:15,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [703202924] [2020-09-04 17:46:15,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:15,429 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:15,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:15,558 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:15,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:15,566 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 17:46:15,567 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [703202924] [2020-09-04 17:46:15,567 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:15,567 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-09-04 17:46:15,568 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66451529] [2020-09-04 17:46:15,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-04 17:46:15,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:15,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-04 17:46:15,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-09-04 17:46:15,569 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 8 states. [2020-09-04 17:46:15,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:15,726 INFO L93 Difference]: Finished difference Result 77 states and 83 transitions. [2020-09-04 17:46:15,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-04 17:46:15,727 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 33 [2020-09-04 17:46:15,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:15,728 INFO L225 Difference]: With dead ends: 77 [2020-09-04 17:46:15,728 INFO L226 Difference]: Without dead ends: 59 [2020-09-04 17:46:15,729 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2020-09-04 17:46:15,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-09-04 17:46:15,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 50. [2020-09-04 17:46:15,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-09-04 17:46:15,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 53 transitions. [2020-09-04 17:46:15,739 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 53 transitions. Word has length 33 [2020-09-04 17:46:15,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:15,740 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 53 transitions. [2020-09-04 17:46:15,740 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-04 17:46:15,740 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 53 transitions. [2020-09-04 17:46:15,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-09-04 17:46:15,741 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:15,741 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:15,741 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-04 17:46:15,742 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:15,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:15,742 INFO L82 PathProgramCache]: Analyzing trace with hash 1221138549, now seen corresponding path program 3 times [2020-09-04 17:46:15,742 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:15,743 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [417300181] [2020-09-04 17:46:15,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:15,755 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:15,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:15,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:15,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:15,858 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 17:46:15,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [417300181] [2020-09-04 17:46:15,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:15,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-09-04 17:46:15,860 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724387343] [2020-09-04 17:46:15,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-04 17:46:15,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:15,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-04 17:46:15,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-09-04 17:46:15,861 INFO L87 Difference]: Start difference. First operand 50 states and 53 transitions. Second operand 6 states. [2020-09-04 17:46:15,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:15,974 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2020-09-04 17:46:15,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-04 17:46:15,974 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 40 [2020-09-04 17:46:15,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:15,975 INFO L225 Difference]: With dead ends: 58 [2020-09-04 17:46:15,976 INFO L226 Difference]: Without dead ends: 52 [2020-09-04 17:46:15,976 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-09-04 17:46:15,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-09-04 17:46:15,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50. [2020-09-04 17:46:15,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-09-04 17:46:15,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-09-04 17:46:15,985 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 40 [2020-09-04 17:46:15,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:15,985 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-09-04 17:46:15,985 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-04 17:46:15,986 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-09-04 17:46:15,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-09-04 17:46:15,987 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:15,987 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 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] [2020-09-04 17:46:15,987 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-04 17:46:15,988 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:15,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:15,988 INFO L82 PathProgramCache]: Analyzing trace with hash -842063729, now seen corresponding path program 1 times [2020-09-04 17:46:15,988 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:15,989 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2075402694] [2020-09-04 17:46:15,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:15,994 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:16,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:16,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:16,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:16,099 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 17:46:16,100 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2075402694] [2020-09-04 17:46:16,100 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:16,100 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-09-04 17:46:16,100 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286004121] [2020-09-04 17:46:16,101 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-04 17:46:16,101 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:16,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-04 17:46:16,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-09-04 17:46:16,102 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 8 states. [2020-09-04 17:46:16,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:16,292 INFO L93 Difference]: Finished difference Result 68 states and 71 transitions. [2020-09-04 17:46:16,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-04 17:46:16,293 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 47 [2020-09-04 17:46:16,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:16,294 INFO L225 Difference]: With dead ends: 68 [2020-09-04 17:46:16,294 INFO L226 Difference]: Without dead ends: 59 [2020-09-04 17:46:16,299 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2020-09-04 17:46:16,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-09-04 17:46:16,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 57. [2020-09-04 17:46:16,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-09-04 17:46:16,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2020-09-04 17:46:16,317 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 47 [2020-09-04 17:46:16,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:16,318 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2020-09-04 17:46:16,318 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-04 17:46:16,318 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2020-09-04 17:46:16,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-09-04 17:46:16,322 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:16,326 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:16,326 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-04 17:46:16,326 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:16,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:16,327 INFO L82 PathProgramCache]: Analyzing trace with hash 1280223029, now seen corresponding path program 2 times [2020-09-04 17:46:16,327 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:16,327 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2122922797] [2020-09-04 17:46:16,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:16,338 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:16,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:16,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:16,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:16,456 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 17:46:16,456 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2122922797] [2020-09-04 17:46:16,457 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:16,457 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-09-04 17:46:16,457 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807060061] [2020-09-04 17:46:16,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-04 17:46:16,458 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:16,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-04 17:46:16,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-09-04 17:46:16,459 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand 10 states. [2020-09-04 17:46:16,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:16,656 INFO L93 Difference]: Finished difference Result 94 states and 98 transitions. [2020-09-04 17:46:16,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-04 17:46:16,657 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 54 [2020-09-04 17:46:16,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:16,658 INFO L225 Difference]: With dead ends: 94 [2020-09-04 17:46:16,658 INFO L226 Difference]: Without dead ends: 69 [2020-09-04 17:46:16,659 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=160, Unknown=0, NotChecked=0, Total=240 [2020-09-04 17:46:16,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-09-04 17:46:16,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 64. [2020-09-04 17:46:16,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-09-04 17:46:16,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-09-04 17:46:16,669 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 54 [2020-09-04 17:46:16,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:16,669 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-09-04 17:46:16,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-04 17:46:16,670 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-09-04 17:46:16,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-09-04 17:46:16,671 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:16,671 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:16,671 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-04 17:46:16,671 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:16,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:16,672 INFO L82 PathProgramCache]: Analyzing trace with hash 1143766212, now seen corresponding path program 3 times [2020-09-04 17:46:16,672 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:16,672 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [155002576] [2020-09-04 17:46:16,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:16,677 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:16,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:16,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:16,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:16,817 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 17:46:16,818 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [155002576] [2020-09-04 17:46:16,818 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:16,818 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2020-09-04 17:46:16,819 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574015192] [2020-09-04 17:46:16,819 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-04 17:46:16,819 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:16,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-04 17:46:16,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2020-09-04 17:46:16,820 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 12 states. [2020-09-04 17:46:17,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:17,026 INFO L93 Difference]: Finished difference Result 101 states and 105 transitions. [2020-09-04 17:46:17,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-09-04 17:46:17,027 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 61 [2020-09-04 17:46:17,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:17,028 INFO L225 Difference]: With dead ends: 101 [2020-09-04 17:46:17,028 INFO L226 Difference]: Without dead ends: 76 [2020-09-04 17:46:17,032 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=125, Invalid=255, Unknown=0, NotChecked=0, Total=380 [2020-09-04 17:46:17,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-09-04 17:46:17,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 71. [2020-09-04 17:46:17,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-09-04 17:46:17,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2020-09-04 17:46:17,042 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 61 [2020-09-04 17:46:17,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:17,042 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2020-09-04 17:46:17,042 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-04 17:46:17,042 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2020-09-04 17:46:17,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-09-04 17:46:17,043 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:17,044 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:17,044 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-04 17:46:17,044 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:17,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:17,045 INFO L82 PathProgramCache]: Analyzing trace with hash -1966270379, now seen corresponding path program 4 times [2020-09-04 17:46:17,045 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:17,045 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1836494455] [2020-09-04 17:46:17,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:17,049 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:17,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:17,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:17,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:17,199 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 17:46:17,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1836494455] [2020-09-04 17:46:17,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:17,200 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2020-09-04 17:46:17,200 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155230136] [2020-09-04 17:46:17,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-09-04 17:46:17,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:17,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-09-04 17:46:17,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2020-09-04 17:46:17,201 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand 14 states. [2020-09-04 17:46:17,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:17,520 INFO L93 Difference]: Finished difference Result 108 states and 112 transitions. [2020-09-04 17:46:17,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-09-04 17:46:17,521 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 68 [2020-09-04 17:46:17,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:17,523 INFO L225 Difference]: With dead ends: 108 [2020-09-04 17:46:17,523 INFO L226 Difference]: Without dead ends: 83 [2020-09-04 17:46:17,524 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=180, Invalid=372, Unknown=0, NotChecked=0, Total=552 [2020-09-04 17:46:17,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-09-04 17:46:17,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 78. [2020-09-04 17:46:17,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-09-04 17:46:17,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-09-04 17:46:17,537 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 68 [2020-09-04 17:46:17,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:17,537 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-09-04 17:46:17,537 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-09-04 17:46:17,537 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-09-04 17:46:17,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-09-04 17:46:17,538 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:17,539 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:17,539 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-04 17:46:17,539 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:17,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:17,539 INFO L82 PathProgramCache]: Analyzing trace with hash -1126004828, now seen corresponding path program 5 times [2020-09-04 17:46:17,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:17,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1105807567] [2020-09-04 17:46:17,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:17,545 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:17,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:17,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:17,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:17,760 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 17:46:17,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1105807567] [2020-09-04 17:46:17,760 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:17,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2020-09-04 17:46:17,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476566507] [2020-09-04 17:46:17,761 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-09-04 17:46:17,761 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:17,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-09-04 17:46:17,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2020-09-04 17:46:17,762 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 16 states. [2020-09-04 17:46:18,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:18,098 INFO L93 Difference]: Finished difference Result 115 states and 119 transitions. [2020-09-04 17:46:18,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-09-04 17:46:18,099 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 75 [2020-09-04 17:46:18,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:18,100 INFO L225 Difference]: With dead ends: 115 [2020-09-04 17:46:18,100 INFO L226 Difference]: Without dead ends: 90 [2020-09-04 17:46:18,101 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=245, Invalid=511, Unknown=0, NotChecked=0, Total=756 [2020-09-04 17:46:18,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-09-04 17:46:18,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 85. [2020-09-04 17:46:18,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-09-04 17:46:18,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2020-09-04 17:46:18,111 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 75 [2020-09-04 17:46:18,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:18,111 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2020-09-04 17:46:18,111 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-09-04 17:46:18,111 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2020-09-04 17:46:18,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-09-04 17:46:18,112 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:18,113 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:18,113 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-04 17:46:18,113 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:18,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:18,113 INFO L82 PathProgramCache]: Analyzing trace with hash -1440804491, now seen corresponding path program 6 times [2020-09-04 17:46:18,114 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:18,114 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [250992586] [2020-09-04 17:46:18,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:18,118 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:18,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:18,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:18,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:18,380 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 17:46:18,381 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [250992586] [2020-09-04 17:46:18,381 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:18,381 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2020-09-04 17:46:18,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1350629104] [2020-09-04 17:46:18,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-09-04 17:46:18,382 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:18,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-09-04 17:46:18,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=224, Unknown=0, NotChecked=0, Total=306 [2020-09-04 17:46:18,383 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand 18 states. [2020-09-04 17:46:18,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:18,762 INFO L93 Difference]: Finished difference Result 122 states and 126 transitions. [2020-09-04 17:46:18,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-09-04 17:46:18,762 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 82 [2020-09-04 17:46:18,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:18,764 INFO L225 Difference]: With dead ends: 122 [2020-09-04 17:46:18,764 INFO L226 Difference]: Without dead ends: 97 [2020-09-04 17:46:18,765 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=320, Invalid=672, Unknown=0, NotChecked=0, Total=992 [2020-09-04 17:46:18,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-09-04 17:46:18,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 92. [2020-09-04 17:46:18,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-09-04 17:46:18,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2020-09-04 17:46:18,774 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 82 [2020-09-04 17:46:18,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:18,774 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2020-09-04 17:46:18,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-09-04 17:46:18,774 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2020-09-04 17:46:18,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-09-04 17:46:18,775 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:18,776 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:18,776 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-04 17:46:18,776 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:18,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:18,776 INFO L82 PathProgramCache]: Analyzing trace with hash -247723388, now seen corresponding path program 7 times [2020-09-04 17:46:18,777 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:18,777 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2105819885] [2020-09-04 17:46:18,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:18,787 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:18,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:19,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:19,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:19,094 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 17:46:19,094 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2105819885] [2020-09-04 17:46:19,094 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:19,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2020-09-04 17:46:19,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833488198] [2020-09-04 17:46:19,095 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-09-04 17:46:19,096 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:19,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-09-04 17:46:19,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=279, Unknown=0, NotChecked=0, Total=380 [2020-09-04 17:46:19,097 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand 20 states. [2020-09-04 17:46:19,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:19,531 INFO L93 Difference]: Finished difference Result 129 states and 133 transitions. [2020-09-04 17:46:19,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-09-04 17:46:19,532 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 89 [2020-09-04 17:46:19,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:19,533 INFO L225 Difference]: With dead ends: 129 [2020-09-04 17:46:19,533 INFO L226 Difference]: Without dead ends: 104 [2020-09-04 17:46:19,534 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=405, Invalid=855, Unknown=0, NotChecked=0, Total=1260 [2020-09-04 17:46:19,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-09-04 17:46:19,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 99. [2020-09-04 17:46:19,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-09-04 17:46:19,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 101 transitions. [2020-09-04 17:46:19,543 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 101 transitions. Word has length 89 [2020-09-04 17:46:19,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:19,543 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 101 transitions. [2020-09-04 17:46:19,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-09-04 17:46:19,543 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 101 transitions. [2020-09-04 17:46:19,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-09-04 17:46:19,544 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:19,545 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:19,545 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-09-04 17:46:19,545 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:19,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:19,546 INFO L82 PathProgramCache]: Analyzing trace with hash -847867243, now seen corresponding path program 8 times [2020-09-04 17:46:19,546 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:19,546 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1909922151] [2020-09-04 17:46:19,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:19,551 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:19,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:19,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:19,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:19,847 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 17:46:19,847 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1909922151] [2020-09-04 17:46:19,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:19,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2020-09-04 17:46:19,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865592766] [2020-09-04 17:46:19,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-09-04 17:46:19,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:19,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-09-04 17:46:19,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=340, Unknown=0, NotChecked=0, Total=462 [2020-09-04 17:46:19,849 INFO L87 Difference]: Start difference. First operand 99 states and 101 transitions. Second operand 22 states. [2020-09-04 17:46:20,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:20,436 INFO L93 Difference]: Finished difference Result 136 states and 140 transitions. [2020-09-04 17:46:20,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-09-04 17:46:20,437 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 96 [2020-09-04 17:46:20,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:20,438 INFO L225 Difference]: With dead ends: 136 [2020-09-04 17:46:20,438 INFO L226 Difference]: Without dead ends: 111 [2020-09-04 17:46:20,439 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=500, Invalid=1060, Unknown=0, NotChecked=0, Total=1560 [2020-09-04 17:46:20,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2020-09-04 17:46:20,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 106. [2020-09-04 17:46:20,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-09-04 17:46:20,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 108 transitions. [2020-09-04 17:46:20,450 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 108 transitions. Word has length 96 [2020-09-04 17:46:20,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:20,451 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 108 transitions. [2020-09-04 17:46:20,451 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-09-04 17:46:20,451 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 108 transitions. [2020-09-04 17:46:20,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-09-04 17:46:20,453 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:20,453 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:20,453 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-09-04 17:46:20,454 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:20,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:20,454 INFO L82 PathProgramCache]: Analyzing trace with hash 566691172, now seen corresponding path program 9 times [2020-09-04 17:46:20,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:20,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [743377675] [2020-09-04 17:46:20,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:20,461 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:20,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:20,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:20,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:20,783 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 17:46:20,784 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [743377675] [2020-09-04 17:46:20,784 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:20,784 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2020-09-04 17:46:20,784 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509238098] [2020-09-04 17:46:20,785 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-09-04 17:46:20,785 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:20,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-09-04 17:46:20,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=407, Unknown=0, NotChecked=0, Total=552 [2020-09-04 17:46:20,786 INFO L87 Difference]: Start difference. First operand 106 states and 108 transitions. Second operand 24 states. [2020-09-04 17:46:21,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:21,415 INFO L93 Difference]: Finished difference Result 143 states and 147 transitions. [2020-09-04 17:46:21,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-09-04 17:46:21,416 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 103 [2020-09-04 17:46:21,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:21,417 INFO L225 Difference]: With dead ends: 143 [2020-09-04 17:46:21,417 INFO L226 Difference]: Without dead ends: 118 [2020-09-04 17:46:21,418 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=605, Invalid=1287, Unknown=0, NotChecked=0, Total=1892 [2020-09-04 17:46:21,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-09-04 17:46:21,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 113. [2020-09-04 17:46:21,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-09-04 17:46:21,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 115 transitions. [2020-09-04 17:46:21,424 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 115 transitions. Word has length 103 [2020-09-04 17:46:21,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:21,425 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 115 transitions. [2020-09-04 17:46:21,425 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-09-04 17:46:21,425 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 115 transitions. [2020-09-04 17:46:21,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-09-04 17:46:21,426 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:21,426 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:21,427 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-09-04 17:46:21,427 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:21,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:21,427 INFO L82 PathProgramCache]: Analyzing trace with hash -1736074315, now seen corresponding path program 10 times [2020-09-04 17:46:21,427 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:21,428 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [790025325] [2020-09-04 17:46:21,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:21,435 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:21,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:21,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:21,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:21,836 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 17:46:21,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [790025325] [2020-09-04 17:46:21,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:21,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2020-09-04 17:46:21,837 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2040992734] [2020-09-04 17:46:21,838 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-09-04 17:46:21,838 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:21,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-09-04 17:46:21,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=480, Unknown=0, NotChecked=0, Total=650 [2020-09-04 17:46:21,840 INFO L87 Difference]: Start difference. First operand 113 states and 115 transitions. Second operand 26 states. [2020-09-04 17:46:22,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:22,576 INFO L93 Difference]: Finished difference Result 150 states and 154 transitions. [2020-09-04 17:46:22,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-09-04 17:46:22,576 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 110 [2020-09-04 17:46:22,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:22,577 INFO L225 Difference]: With dead ends: 150 [2020-09-04 17:46:22,577 INFO L226 Difference]: Without dead ends: 125 [2020-09-04 17:46:22,579 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 362 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=720, Invalid=1536, Unknown=0, NotChecked=0, Total=2256 [2020-09-04 17:46:22,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2020-09-04 17:46:22,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 120. [2020-09-04 17:46:22,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-09-04 17:46:22,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 122 transitions. [2020-09-04 17:46:22,589 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 122 transitions. Word has length 110 [2020-09-04 17:46:22,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:22,589 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 122 transitions. [2020-09-04 17:46:22,589 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-09-04 17:46:22,589 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 122 transitions. [2020-09-04 17:46:22,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-09-04 17:46:22,590 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:22,591 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 12, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:22,591 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-09-04 17:46:22,591 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:22,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:22,592 INFO L82 PathProgramCache]: Analyzing trace with hash 2123462724, now seen corresponding path program 11 times [2020-09-04 17:46:22,592 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:22,592 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1680589699] [2020-09-04 17:46:22,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:22,599 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:22,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:22,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:22,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:23,002 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 17:46:23,003 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1680589699] [2020-09-04 17:46:23,003 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:23,003 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2020-09-04 17:46:23,004 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755696479] [2020-09-04 17:46:23,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-09-04 17:46:23,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:23,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-09-04 17:46:23,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=559, Unknown=0, NotChecked=0, Total=756 [2020-09-04 17:46:23,005 INFO L87 Difference]: Start difference. First operand 120 states and 122 transitions. Second operand 28 states. [2020-09-04 17:46:23,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:23,757 INFO L93 Difference]: Finished difference Result 157 states and 161 transitions. [2020-09-04 17:46:23,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-09-04 17:46:23,758 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 117 [2020-09-04 17:46:23,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:23,759 INFO L225 Difference]: With dead ends: 157 [2020-09-04 17:46:23,759 INFO L226 Difference]: Without dead ends: 132 [2020-09-04 17:46:23,761 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 431 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=845, Invalid=1807, Unknown=0, NotChecked=0, Total=2652 [2020-09-04 17:46:23,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2020-09-04 17:46:23,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 127. [2020-09-04 17:46:23,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-09-04 17:46:23,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 129 transitions. [2020-09-04 17:46:23,768 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 129 transitions. Word has length 117 [2020-09-04 17:46:23,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:23,769 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 129 transitions. [2020-09-04 17:46:23,769 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-09-04 17:46:23,769 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 129 transitions. [2020-09-04 17:46:23,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-09-04 17:46:23,770 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:23,770 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 13, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:23,771 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-09-04 17:46:23,771 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:23,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:23,771 INFO L82 PathProgramCache]: Analyzing trace with hash 1333669077, now seen corresponding path program 12 times [2020-09-04 17:46:23,771 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:23,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1782224455] [2020-09-04 17:46:23,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:23,777 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:23,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:24,290 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:24,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:24,322 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 17:46:24,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1782224455] [2020-09-04 17:46:24,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:24,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2020-09-04 17:46:24,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585674326] [2020-09-04 17:46:24,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-09-04 17:46:24,325 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:24,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-09-04 17:46:24,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=644, Unknown=0, NotChecked=0, Total=870 [2020-09-04 17:46:24,326 INFO L87 Difference]: Start difference. First operand 127 states and 129 transitions. Second operand 30 states. [2020-09-04 17:46:25,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:25,254 INFO L93 Difference]: Finished difference Result 164 states and 168 transitions. [2020-09-04 17:46:25,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-09-04 17:46:25,255 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 124 [2020-09-04 17:46:25,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:25,257 INFO L225 Difference]: With dead ends: 164 [2020-09-04 17:46:25,257 INFO L226 Difference]: Without dead ends: 139 [2020-09-04 17:46:25,259 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=980, Invalid=2100, Unknown=0, NotChecked=0, Total=3080 [2020-09-04 17:46:25,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2020-09-04 17:46:25,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 134. [2020-09-04 17:46:25,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2020-09-04 17:46:25,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 136 transitions. [2020-09-04 17:46:25,266 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 136 transitions. Word has length 124 [2020-09-04 17:46:25,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:25,266 INFO L479 AbstractCegarLoop]: Abstraction has 134 states and 136 transitions. [2020-09-04 17:46:25,266 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-09-04 17:46:25,267 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 136 transitions. [2020-09-04 17:46:25,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2020-09-04 17:46:25,268 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:25,268 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 14, 14, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:25,268 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-09-04 17:46:25,269 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:25,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:25,269 INFO L82 PathProgramCache]: Analyzing trace with hash 120152868, now seen corresponding path program 13 times [2020-09-04 17:46:25,269 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:25,269 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1999156245] [2020-09-04 17:46:25,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:25,274 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:25,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:25,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:25,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:25,834 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 17:46:25,834 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1999156245] [2020-09-04 17:46:25,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:25,834 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2020-09-04 17:46:25,835 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081540938] [2020-09-04 17:46:25,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-09-04 17:46:25,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:25,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-09-04 17:46:25,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=735, Unknown=0, NotChecked=0, Total=992 [2020-09-04 17:46:25,836 INFO L87 Difference]: Start difference. First operand 134 states and 136 transitions. Second operand 32 states. [2020-09-04 17:46:26,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:26,860 INFO L93 Difference]: Finished difference Result 171 states and 175 transitions. [2020-09-04 17:46:26,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-09-04 17:46:26,861 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 131 [2020-09-04 17:46:26,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:26,862 INFO L225 Difference]: With dead ends: 171 [2020-09-04 17:46:26,862 INFO L226 Difference]: Without dead ends: 146 [2020-09-04 17:46:26,867 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 587 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1125, Invalid=2415, Unknown=0, NotChecked=0, Total=3540 [2020-09-04 17:46:26,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2020-09-04 17:46:26,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 141. [2020-09-04 17:46:26,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2020-09-04 17:46:26,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2020-09-04 17:46:26,875 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 131 [2020-09-04 17:46:26,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:26,875 INFO L479 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2020-09-04 17:46:26,876 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-09-04 17:46:26,876 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2020-09-04 17:46:26,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2020-09-04 17:46:26,878 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:26,878 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 15, 15, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:26,879 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-09-04 17:46:26,879 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:26,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:26,879 INFO L82 PathProgramCache]: Analyzing trace with hash -149797387, now seen corresponding path program 14 times [2020-09-04 17:46:26,881 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:26,882 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [466701226] [2020-09-04 17:46:26,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:26,889 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:26,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:27,536 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:27,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:27,554 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 17:46:27,555 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [466701226] [2020-09-04 17:46:27,555 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:27,555 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2020-09-04 17:46:27,555 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31935403] [2020-09-04 17:46:27,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-09-04 17:46:27,556 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:27,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-09-04 17:46:27,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=832, Unknown=0, NotChecked=0, Total=1122 [2020-09-04 17:46:27,557 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand 34 states. [2020-09-04 17:46:28,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:28,779 INFO L93 Difference]: Finished difference Result 178 states and 182 transitions. [2020-09-04 17:46:28,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-09-04 17:46:28,780 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 138 [2020-09-04 17:46:28,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:28,781 INFO L225 Difference]: With dead ends: 178 [2020-09-04 17:46:28,781 INFO L226 Difference]: Without dead ends: 153 [2020-09-04 17:46:28,783 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 674 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1280, Invalid=2752, Unknown=0, NotChecked=0, Total=4032 [2020-09-04 17:46:28,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2020-09-04 17:46:28,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 148. [2020-09-04 17:46:28,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2020-09-04 17:46:28,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 150 transitions. [2020-09-04 17:46:28,790 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 150 transitions. Word has length 138 [2020-09-04 17:46:28,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:28,790 INFO L479 AbstractCegarLoop]: Abstraction has 148 states and 150 transitions. [2020-09-04 17:46:28,790 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-09-04 17:46:28,790 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 150 transitions. [2020-09-04 17:46:28,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-09-04 17:46:28,792 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:28,792 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 16, 16, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:28,792 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-09-04 17:46:28,792 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:28,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:28,793 INFO L82 PathProgramCache]: Analyzing trace with hash 1788659204, now seen corresponding path program 15 times [2020-09-04 17:46:28,793 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:28,793 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1761570693] [2020-09-04 17:46:28,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:28,797 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:28,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:29,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:29,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:29,485 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 17:46:29,486 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1761570693] [2020-09-04 17:46:29,486 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:29,486 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2020-09-04 17:46:29,486 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921036440] [2020-09-04 17:46:29,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-09-04 17:46:29,487 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:29,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-09-04 17:46:29,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=935, Unknown=0, NotChecked=0, Total=1260 [2020-09-04 17:46:29,487 INFO L87 Difference]: Start difference. First operand 148 states and 150 transitions. Second operand 36 states. [2020-09-04 17:46:30,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:30,782 INFO L93 Difference]: Finished difference Result 185 states and 189 transitions. [2020-09-04 17:46:30,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-09-04 17:46:30,784 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 145 [2020-09-04 17:46:30,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:30,785 INFO L225 Difference]: With dead ends: 185 [2020-09-04 17:46:30,785 INFO L226 Difference]: Without dead ends: 160 [2020-09-04 17:46:30,787 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 767 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1445, Invalid=3111, Unknown=0, NotChecked=0, Total=4556 [2020-09-04 17:46:30,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2020-09-04 17:46:30,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 155. [2020-09-04 17:46:30,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 155 states. [2020-09-04 17:46:30,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 157 transitions. [2020-09-04 17:46:30,797 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 157 transitions. Word has length 145 [2020-09-04 17:46:30,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:30,798 INFO L479 AbstractCegarLoop]: Abstraction has 155 states and 157 transitions. [2020-09-04 17:46:30,798 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-09-04 17:46:30,798 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 157 transitions. [2020-09-04 17:46:30,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2020-09-04 17:46:30,800 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:30,801 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 17, 17, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:30,801 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-09-04 17:46:30,801 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:30,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:30,802 INFO L82 PathProgramCache]: Analyzing trace with hash 1953752853, now seen corresponding path program 16 times [2020-09-04 17:46:30,802 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:30,802 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1436644027] [2020-09-04 17:46:30,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:30,808 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:30,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:31,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:31,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:31,642 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 17:46:31,643 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1436644027] [2020-09-04 17:46:31,643 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:31,644 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2020-09-04 17:46:31,644 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349823689] [2020-09-04 17:46:31,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-09-04 17:46:31,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:31,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-09-04 17:46:31,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=362, Invalid=1044, Unknown=0, NotChecked=0, Total=1406 [2020-09-04 17:46:31,645 INFO L87 Difference]: Start difference. First operand 155 states and 157 transitions. Second operand 38 states. [2020-09-04 17:46:33,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:33,125 INFO L93 Difference]: Finished difference Result 192 states and 196 transitions. [2020-09-04 17:46:33,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-09-04 17:46:33,126 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 152 [2020-09-04 17:46:33,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:33,127 INFO L225 Difference]: With dead ends: 192 [2020-09-04 17:46:33,127 INFO L226 Difference]: Without dead ends: 167 [2020-09-04 17:46:33,129 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 866 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1620, Invalid=3492, Unknown=0, NotChecked=0, Total=5112 [2020-09-04 17:46:33,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2020-09-04 17:46:33,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 162. [2020-09-04 17:46:33,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2020-09-04 17:46:33,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 164 transitions. [2020-09-04 17:46:33,135 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 164 transitions. Word has length 152 [2020-09-04 17:46:33,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:33,135 INFO L479 AbstractCegarLoop]: Abstraction has 162 states and 164 transitions. [2020-09-04 17:46:33,136 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-09-04 17:46:33,136 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 164 transitions. [2020-09-04 17:46:33,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2020-09-04 17:46:33,137 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:33,138 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 18, 18, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:33,138 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-09-04 17:46:33,138 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:33,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:33,138 INFO L82 PathProgramCache]: Analyzing trace with hash -411459356, now seen corresponding path program 17 times [2020-09-04 17:46:33,139 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:33,139 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [890306896] [2020-09-04 17:46:33,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:33,149 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:33,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:33,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:33,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:34,016 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 17:46:34,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [890306896] [2020-09-04 17:46:34,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:34,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2020-09-04 17:46:34,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524718275] [2020-09-04 17:46:34,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-09-04 17:46:34,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:34,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-09-04 17:46:34,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=401, Invalid=1159, Unknown=0, NotChecked=0, Total=1560 [2020-09-04 17:46:34,018 INFO L87 Difference]: Start difference. First operand 162 states and 164 transitions. Second operand 40 states. [2020-09-04 17:46:35,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:35,583 INFO L93 Difference]: Finished difference Result 199 states and 203 transitions. [2020-09-04 17:46:35,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-09-04 17:46:35,584 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 159 [2020-09-04 17:46:35,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:35,585 INFO L225 Difference]: With dead ends: 199 [2020-09-04 17:46:35,585 INFO L226 Difference]: Without dead ends: 174 [2020-09-04 17:46:35,587 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 971 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1805, Invalid=3895, Unknown=0, NotChecked=0, Total=5700 [2020-09-04 17:46:35,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2020-09-04 17:46:35,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 169. [2020-09-04 17:46:35,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2020-09-04 17:46:35,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 171 transitions. [2020-09-04 17:46:35,593 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 171 transitions. Word has length 159 [2020-09-04 17:46:35,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:35,594 INFO L479 AbstractCegarLoop]: Abstraction has 169 states and 171 transitions. [2020-09-04 17:46:35,594 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-09-04 17:46:35,594 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 171 transitions. [2020-09-04 17:46:35,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2020-09-04 17:46:35,596 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:35,596 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 19, 19, 19, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:35,596 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-09-04 17:46:35,596 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:35,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:35,597 INFO L82 PathProgramCache]: Analyzing trace with hash -1386934219, now seen corresponding path program 18 times [2020-09-04 17:46:35,597 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:35,597 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1830432798] [2020-09-04 17:46:35,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:35,601 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:35,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:36,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:36,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:36,629 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 17:46:36,635 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1830432798] [2020-09-04 17:46:36,635 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:36,635 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2020-09-04 17:46:36,635 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570200545] [2020-09-04 17:46:36,636 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-09-04 17:46:36,636 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:36,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-09-04 17:46:36,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=442, Invalid=1280, Unknown=0, NotChecked=0, Total=1722 [2020-09-04 17:46:36,638 INFO L87 Difference]: Start difference. First operand 169 states and 171 transitions. Second operand 42 states. [2020-09-04 17:46:38,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:38,389 INFO L93 Difference]: Finished difference Result 206 states and 210 transitions. [2020-09-04 17:46:38,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-09-04 17:46:38,390 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 166 [2020-09-04 17:46:38,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:38,392 INFO L225 Difference]: With dead ends: 206 [2020-09-04 17:46:38,392 INFO L226 Difference]: Without dead ends: 181 [2020-09-04 17:46:38,394 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1082 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2000, Invalid=4320, Unknown=0, NotChecked=0, Total=6320 [2020-09-04 17:46:38,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2020-09-04 17:46:38,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 176. [2020-09-04 17:46:38,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-09-04 17:46:38,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 178 transitions. [2020-09-04 17:46:38,401 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 178 transitions. Word has length 166 [2020-09-04 17:46:38,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:38,401 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 178 transitions. [2020-09-04 17:46:38,401 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-09-04 17:46:38,402 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 178 transitions. [2020-09-04 17:46:38,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2020-09-04 17:46:38,403 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:38,403 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 20, 20, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:38,403 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-09-04 17:46:38,403 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:38,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:38,403 INFO L82 PathProgramCache]: Analyzing trace with hash 734917572, now seen corresponding path program 19 times [2020-09-04 17:46:38,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:38,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1205654526] [2020-09-04 17:46:38,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:38,416 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:38,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:39,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:39,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:39,511 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 17:46:39,512 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1205654526] [2020-09-04 17:46:39,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:39,512 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2020-09-04 17:46:39,512 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871347525] [2020-09-04 17:46:39,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-09-04 17:46:39,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:39,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-09-04 17:46:39,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=485, Invalid=1407, Unknown=0, NotChecked=0, Total=1892 [2020-09-04 17:46:39,514 INFO L87 Difference]: Start difference. First operand 176 states and 178 transitions. Second operand 44 states. [2020-09-04 17:46:41,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:41,339 INFO L93 Difference]: Finished difference Result 213 states and 217 transitions. [2020-09-04 17:46:41,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-09-04 17:46:41,340 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 173 [2020-09-04 17:46:41,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:41,342 INFO L225 Difference]: With dead ends: 213 [2020-09-04 17:46:41,342 INFO L226 Difference]: Without dead ends: 188 [2020-09-04 17:46:41,346 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1199 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2205, Invalid=4767, Unknown=0, NotChecked=0, Total=6972 [2020-09-04 17:46:41,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2020-09-04 17:46:41,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 183. [2020-09-04 17:46:41,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2020-09-04 17:46:41,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 185 transitions. [2020-09-04 17:46:41,353 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 185 transitions. Word has length 173 [2020-09-04 17:46:41,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:41,353 INFO L479 AbstractCegarLoop]: Abstraction has 183 states and 185 transitions. [2020-09-04 17:46:41,354 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-09-04 17:46:41,354 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 185 transitions. [2020-09-04 17:46:41,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2020-09-04 17:46:41,355 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:41,355 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 21, 21, 21, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:41,355 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-09-04 17:46:41,355 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:41,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:41,356 INFO L82 PathProgramCache]: Analyzing trace with hash -1477983915, now seen corresponding path program 20 times [2020-09-04 17:46:41,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:41,356 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [464747325] [2020-09-04 17:46:41,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:41,365 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:41,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:42,469 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:42,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:42,495 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 17:46:42,495 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [464747325] [2020-09-04 17:46:42,495 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:42,496 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2020-09-04 17:46:42,496 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021525306] [2020-09-04 17:46:42,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-09-04 17:46:42,496 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:42,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-09-04 17:46:42,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=1540, Unknown=0, NotChecked=0, Total=2070 [2020-09-04 17:46:42,497 INFO L87 Difference]: Start difference. First operand 183 states and 185 transitions. Second operand 46 states. [2020-09-04 17:46:44,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:44,357 INFO L93 Difference]: Finished difference Result 220 states and 224 transitions. [2020-09-04 17:46:44,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-09-04 17:46:44,358 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 180 [2020-09-04 17:46:44,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:44,360 INFO L225 Difference]: With dead ends: 220 [2020-09-04 17:46:44,360 INFO L226 Difference]: Without dead ends: 195 [2020-09-04 17:46:44,362 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1322 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2420, Invalid=5236, Unknown=0, NotChecked=0, Total=7656 [2020-09-04 17:46:44,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2020-09-04 17:46:44,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 190. [2020-09-04 17:46:44,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-09-04 17:46:44,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 192 transitions. [2020-09-04 17:46:44,369 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 192 transitions. Word has length 180 [2020-09-04 17:46:44,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:44,370 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 192 transitions. [2020-09-04 17:46:44,370 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-09-04 17:46:44,370 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 192 transitions. [2020-09-04 17:46:44,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2020-09-04 17:46:44,371 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:44,371 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 22, 22, 22, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:44,372 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-09-04 17:46:44,372 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:44,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:44,372 INFO L82 PathProgramCache]: Analyzing trace with hash 891797156, now seen corresponding path program 21 times [2020-09-04 17:46:44,372 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:44,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [276092027] [2020-09-04 17:46:44,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:44,379 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:44,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:45,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:45,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:45,659 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 17:46:45,660 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [276092027] [2020-09-04 17:46:45,660 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:45,666 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2020-09-04 17:46:45,666 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671150107] [2020-09-04 17:46:45,667 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-09-04 17:46:45,667 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:45,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-09-04 17:46:45,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=577, Invalid=1679, Unknown=0, NotChecked=0, Total=2256 [2020-09-04 17:46:45,668 INFO L87 Difference]: Start difference. First operand 190 states and 192 transitions. Second operand 48 states. [2020-09-04 17:46:47,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:47,609 INFO L93 Difference]: Finished difference Result 227 states and 231 transitions. [2020-09-04 17:46:47,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-09-04 17:46:47,610 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 187 [2020-09-04 17:46:47,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:47,612 INFO L225 Difference]: With dead ends: 227 [2020-09-04 17:46:47,612 INFO L226 Difference]: Without dead ends: 202 [2020-09-04 17:46:47,616 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1451 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2645, Invalid=5727, Unknown=0, NotChecked=0, Total=8372 [2020-09-04 17:46:47,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-09-04 17:46:47,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 197. [2020-09-04 17:46:47,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2020-09-04 17:46:47,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 199 transitions. [2020-09-04 17:46:47,622 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 199 transitions. Word has length 187 [2020-09-04 17:46:47,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:47,623 INFO L479 AbstractCegarLoop]: Abstraction has 197 states and 199 transitions. [2020-09-04 17:46:47,623 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-09-04 17:46:47,623 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 199 transitions. [2020-09-04 17:46:47,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2020-09-04 17:46:47,624 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:47,625 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 23, 23, 23, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:47,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-09-04 17:46:47,625 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:47,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:47,625 INFO L82 PathProgramCache]: Analyzing trace with hash -1428293003, now seen corresponding path program 22 times [2020-09-04 17:46:47,625 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:47,626 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2066661745] [2020-09-04 17:46:47,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:47,633 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:47,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:48,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:48,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:48,973 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 17:46:48,974 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2066661745] [2020-09-04 17:46:48,974 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:48,974 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2020-09-04 17:46:48,974 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932813019] [2020-09-04 17:46:48,974 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-09-04 17:46:48,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:48,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-09-04 17:46:48,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=626, Invalid=1824, Unknown=0, NotChecked=0, Total=2450 [2020-09-04 17:46:48,975 INFO L87 Difference]: Start difference. First operand 197 states and 199 transitions. Second operand 50 states. [2020-09-04 17:46:51,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:51,362 INFO L93 Difference]: Finished difference Result 234 states and 238 transitions. [2020-09-04 17:46:51,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2020-09-04 17:46:51,363 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 194 [2020-09-04 17:46:51,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:51,365 INFO L225 Difference]: With dead ends: 234 [2020-09-04 17:46:51,365 INFO L226 Difference]: Without dead ends: 209 [2020-09-04 17:46:51,366 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1586 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2880, Invalid=6240, Unknown=0, NotChecked=0, Total=9120 [2020-09-04 17:46:51,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-09-04 17:46:51,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 204. [2020-09-04 17:46:51,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-09-04 17:46:51,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 206 transitions. [2020-09-04 17:46:51,373 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 206 transitions. Word has length 194 [2020-09-04 17:46:51,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:51,375 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 206 transitions. [2020-09-04 17:46:51,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-09-04 17:46:51,375 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 206 transitions. [2020-09-04 17:46:51,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-09-04 17:46:51,376 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:51,376 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 24, 24, 24, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:51,376 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-09-04 17:46:51,376 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:51,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:51,377 INFO L82 PathProgramCache]: Analyzing trace with hash 815071620, now seen corresponding path program 23 times [2020-09-04 17:46:51,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:51,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2126534757] [2020-09-04 17:46:51,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:51,386 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:51,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:52,815 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:52,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:52,844 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 17:46:52,845 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2126534757] [2020-09-04 17:46:52,845 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:52,845 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2020-09-04 17:46:52,845 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863467582] [2020-09-04 17:46:52,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-09-04 17:46:52,845 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:52,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-09-04 17:46:52,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=677, Invalid=1975, Unknown=0, NotChecked=0, Total=2652 [2020-09-04 17:46:52,846 INFO L87 Difference]: Start difference. First operand 204 states and 206 transitions. Second operand 52 states. [2020-09-04 17:46:55,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:55,455 INFO L93 Difference]: Finished difference Result 241 states and 245 transitions. [2020-09-04 17:46:55,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2020-09-04 17:46:55,456 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 201 [2020-09-04 17:46:55,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:55,458 INFO L225 Difference]: With dead ends: 241 [2020-09-04 17:46:55,458 INFO L226 Difference]: Without dead ends: 216 [2020-09-04 17:46:55,459 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1727 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=3125, Invalid=6775, Unknown=0, NotChecked=0, Total=9900 [2020-09-04 17:46:55,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2020-09-04 17:46:55,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 211. [2020-09-04 17:46:55,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 211 states. [2020-09-04 17:46:55,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 213 transitions. [2020-09-04 17:46:55,466 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 213 transitions. Word has length 201 [2020-09-04 17:46:55,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:55,467 INFO L479 AbstractCegarLoop]: Abstraction has 211 states and 213 transitions. [2020-09-04 17:46:55,467 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-09-04 17:46:55,467 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 213 transitions. [2020-09-04 17:46:55,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-09-04 17:46:55,468 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:55,468 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 25, 25, 25, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:55,469 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-09-04 17:46:55,469 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:55,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:55,469 INFO L82 PathProgramCache]: Analyzing trace with hash 1567210389, now seen corresponding path program 24 times [2020-09-04 17:46:55,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:55,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [103109531] [2020-09-04 17:46:55,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:55,478 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:55,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:56,998 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:46:57,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:46:57,026 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 17:46:57,027 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [103109531] [2020-09-04 17:46:57,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:46:57,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2020-09-04 17:46:57,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826807999] [2020-09-04 17:46:57,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-09-04 17:46:57,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:46:57,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-09-04 17:46:57,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=730, Invalid=2132, Unknown=0, NotChecked=0, Total=2862 [2020-09-04 17:46:57,028 INFO L87 Difference]: Start difference. First operand 211 states and 213 transitions. Second operand 54 states. [2020-09-04 17:46:59,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:46:59,570 INFO L93 Difference]: Finished difference Result 248 states and 252 transitions. [2020-09-04 17:46:59,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2020-09-04 17:46:59,571 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 208 [2020-09-04 17:46:59,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:46:59,573 INFO L225 Difference]: With dead ends: 248 [2020-09-04 17:46:59,573 INFO L226 Difference]: Without dead ends: 223 [2020-09-04 17:46:59,574 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1874 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=3380, Invalid=7332, Unknown=0, NotChecked=0, Total=10712 [2020-09-04 17:46:59,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2020-09-04 17:46:59,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 218. [2020-09-04 17:46:59,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 218 states. [2020-09-04 17:46:59,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 220 transitions. [2020-09-04 17:46:59,581 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 220 transitions. Word has length 208 [2020-09-04 17:46:59,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:46:59,581 INFO L479 AbstractCegarLoop]: Abstraction has 218 states and 220 transitions. [2020-09-04 17:46:59,581 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-09-04 17:46:59,581 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 220 transitions. [2020-09-04 17:46:59,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2020-09-04 17:46:59,583 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:46:59,583 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 26, 26, 26, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:46:59,583 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-09-04 17:46:59,583 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:46:59,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:46:59,583 INFO L82 PathProgramCache]: Analyzing trace with hash 1520680036, now seen corresponding path program 25 times [2020-09-04 17:46:59,584 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:46:59,584 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [527863857] [2020-09-04 17:46:59,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:46:59,593 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:46:59,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:47:01,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:47:01,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:47:01,264 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 17:47:01,264 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [527863857] [2020-09-04 17:47:01,264 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:47:01,264 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2020-09-04 17:47:01,264 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747211700] [2020-09-04 17:47:01,265 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-09-04 17:47:01,265 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:47:01,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-09-04 17:47:01,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=785, Invalid=2295, Unknown=0, NotChecked=0, Total=3080 [2020-09-04 17:47:01,266 INFO L87 Difference]: Start difference. First operand 218 states and 220 transitions. Second operand 56 states. [2020-09-04 17:47:04,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:47:04,289 INFO L93 Difference]: Finished difference Result 255 states and 259 transitions. [2020-09-04 17:47:04,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2020-09-04 17:47:04,290 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 215 [2020-09-04 17:47:04,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:47:04,291 INFO L225 Difference]: With dead ends: 255 [2020-09-04 17:47:04,291 INFO L226 Difference]: Without dead ends: 230 [2020-09-04 17:47:04,293 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2027 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=3645, Invalid=7911, Unknown=0, NotChecked=0, Total=11556 [2020-09-04 17:47:04,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2020-09-04 17:47:04,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 225. [2020-09-04 17:47:04,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2020-09-04 17:47:04,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 227 transitions. [2020-09-04 17:47:04,299 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 227 transitions. Word has length 215 [2020-09-04 17:47:04,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:47:04,300 INFO L479 AbstractCegarLoop]: Abstraction has 225 states and 227 transitions. [2020-09-04 17:47:04,300 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-09-04 17:47:04,300 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 227 transitions. [2020-09-04 17:47:04,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2020-09-04 17:47:04,301 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:47:04,301 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 27, 27, 27, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:47:04,301 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-09-04 17:47:04,302 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:47:04,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:47:04,302 INFO L82 PathProgramCache]: Analyzing trace with hash -415431499, now seen corresponding path program 26 times [2020-09-04 17:47:04,302 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:47:04,303 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [110796576] [2020-09-04 17:47:04,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:47:04,312 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:47:04,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:47:06,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:47:06,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:47:06,130 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 17:47:06,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [110796576] [2020-09-04 17:47:06,130 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:47:06,130 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2020-09-04 17:47:06,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214969186] [2020-09-04 17:47:06,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-09-04 17:47:06,131 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:47:06,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-09-04 17:47:06,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=842, Invalid=2464, Unknown=0, NotChecked=0, Total=3306 [2020-09-04 17:47:06,131 INFO L87 Difference]: Start difference. First operand 225 states and 227 transitions. Second operand 58 states. [2020-09-04 17:47:09,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:47:09,359 INFO L93 Difference]: Finished difference Result 262 states and 266 transitions. [2020-09-04 17:47:09,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2020-09-04 17:47:09,360 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 222 [2020-09-04 17:47:09,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:47:09,362 INFO L225 Difference]: With dead ends: 262 [2020-09-04 17:47:09,362 INFO L226 Difference]: Without dead ends: 237 [2020-09-04 17:47:09,363 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2186 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3920, Invalid=8512, Unknown=0, NotChecked=0, Total=12432 [2020-09-04 17:47:09,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2020-09-04 17:47:09,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 232. [2020-09-04 17:47:09,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2020-09-04 17:47:09,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 234 transitions. [2020-09-04 17:47:09,370 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 234 transitions. Word has length 222 [2020-09-04 17:47:09,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:47:09,370 INFO L479 AbstractCegarLoop]: Abstraction has 232 states and 234 transitions. [2020-09-04 17:47:09,371 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-09-04 17:47:09,371 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 234 transitions. [2020-09-04 17:47:09,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2020-09-04 17:47:09,372 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:47:09,372 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 28, 28, 28, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:47:09,372 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-09-04 17:47:09,373 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:47:09,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:47:09,373 INFO L82 PathProgramCache]: Analyzing trace with hash -547229884, now seen corresponding path program 27 times [2020-09-04 17:47:09,373 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:47:09,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1506290700] [2020-09-04 17:47:09,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:47:09,378 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:47:09,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:47:11,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:47:11,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:47:11,389 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 17:47:11,389 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1506290700] [2020-09-04 17:47:11,389 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:47:11,389 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2020-09-04 17:47:11,390 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343902128] [2020-09-04 17:47:11,390 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-09-04 17:47:11,390 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:47:11,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-09-04 17:47:11,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=901, Invalid=2639, Unknown=0, NotChecked=0, Total=3540 [2020-09-04 17:47:11,391 INFO L87 Difference]: Start difference. First operand 232 states and 234 transitions. Second operand 60 states. [2020-09-04 17:47:14,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:47:14,854 INFO L93 Difference]: Finished difference Result 269 states and 273 transitions. [2020-09-04 17:47:14,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2020-09-04 17:47:14,855 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 229 [2020-09-04 17:47:14,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:47:14,858 INFO L225 Difference]: With dead ends: 269 [2020-09-04 17:47:14,858 INFO L226 Difference]: Without dead ends: 244 [2020-09-04 17:47:14,859 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2351 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=4205, Invalid=9135, Unknown=0, NotChecked=0, Total=13340 [2020-09-04 17:47:14,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2020-09-04 17:47:14,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 239. [2020-09-04 17:47:14,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239 states. [2020-09-04 17:47:14,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 241 transitions. [2020-09-04 17:47:14,867 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 241 transitions. Word has length 229 [2020-09-04 17:47:14,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:47:14,867 INFO L479 AbstractCegarLoop]: Abstraction has 239 states and 241 transitions. [2020-09-04 17:47:14,867 INFO L480 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-09-04 17:47:14,867 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 241 transitions. [2020-09-04 17:47:14,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2020-09-04 17:47:14,868 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:47:14,869 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 29, 29, 29, 29, 29, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:47:14,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-09-04 17:47:14,869 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:47:14,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:47:14,869 INFO L82 PathProgramCache]: Analyzing trace with hash 277468629, now seen corresponding path program 28 times [2020-09-04 17:47:14,870 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:47:14,870 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1703548021] [2020-09-04 17:47:14,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:47:14,879 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:47:14,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:47:16,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:47:16,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:47:16,822 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 17:47:16,823 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1703548021] [2020-09-04 17:47:16,823 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:47:16,823 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2020-09-04 17:47:16,823 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916393618] [2020-09-04 17:47:16,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-09-04 17:47:16,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:47:16,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-09-04 17:47:16,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=962, Invalid=2820, Unknown=0, NotChecked=0, Total=3782 [2020-09-04 17:47:16,825 INFO L87 Difference]: Start difference. First operand 239 states and 241 transitions. Second operand 62 states. [2020-09-04 17:47:20,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:47:20,521 INFO L93 Difference]: Finished difference Result 276 states and 280 transitions. [2020-09-04 17:47:20,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2020-09-04 17:47:20,522 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 236 [2020-09-04 17:47:20,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:47:20,524 INFO L225 Difference]: With dead ends: 276 [2020-09-04 17:47:20,524 INFO L226 Difference]: Without dead ends: 251 [2020-09-04 17:47:20,526 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2522 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=4500, Invalid=9780, Unknown=0, NotChecked=0, Total=14280 [2020-09-04 17:47:20,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2020-09-04 17:47:20,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 246. [2020-09-04 17:47:20,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 246 states. [2020-09-04 17:47:20,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 248 transitions. [2020-09-04 17:47:20,532 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 248 transitions. Word has length 236 [2020-09-04 17:47:20,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:47:20,533 INFO L479 AbstractCegarLoop]: Abstraction has 246 states and 248 transitions. [2020-09-04 17:47:20,533 INFO L480 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-09-04 17:47:20,533 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 248 transitions. [2020-09-04 17:47:20,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2020-09-04 17:47:20,534 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:47:20,535 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 30, 30, 30, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:47:20,535 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-09-04 17:47:20,535 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:47:20,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:47:20,535 INFO L82 PathProgramCache]: Analyzing trace with hash -1168270812, now seen corresponding path program 29 times [2020-09-04 17:47:20,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:47:20,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [85611717] [2020-09-04 17:47:20,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:47:20,548 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:47:20,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:47:22,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:47:22,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:47:22,802 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 17:47:22,802 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [85611717] [2020-09-04 17:47:22,803 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:47:22,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [64] imperfect sequences [] total 64 [2020-09-04 17:47:22,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553085984] [2020-09-04 17:47:22,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2020-09-04 17:47:22,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:47:22,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2020-09-04 17:47:22,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1025, Invalid=3007, Unknown=0, NotChecked=0, Total=4032 [2020-09-04 17:47:22,804 INFO L87 Difference]: Start difference. First operand 246 states and 248 transitions. Second operand 64 states. [2020-09-04 17:47:26,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:47:26,723 INFO L93 Difference]: Finished difference Result 283 states and 287 transitions. [2020-09-04 17:47:26,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-09-04 17:47:26,724 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 243 [2020-09-04 17:47:26,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:47:26,726 INFO L225 Difference]: With dead ends: 283 [2020-09-04 17:47:26,726 INFO L226 Difference]: Without dead ends: 258 [2020-09-04 17:47:26,727 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2699 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=4805, Invalid=10447, Unknown=0, NotChecked=0, Total=15252 [2020-09-04 17:47:26,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2020-09-04 17:47:26,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 253. [2020-09-04 17:47:26,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 253 states. [2020-09-04 17:47:26,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 255 transitions. [2020-09-04 17:47:26,734 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 255 transitions. Word has length 243 [2020-09-04 17:47:26,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:47:26,734 INFO L479 AbstractCegarLoop]: Abstraction has 253 states and 255 transitions. [2020-09-04 17:47:26,734 INFO L480 AbstractCegarLoop]: Interpolant automaton has 64 states. [2020-09-04 17:47:26,735 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 255 transitions. [2020-09-04 17:47:26,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2020-09-04 17:47:26,736 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:47:26,736 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 31, 31, 31, 31, 31, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:47:26,736 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-09-04 17:47:26,737 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:47:26,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:47:26,737 INFO L82 PathProgramCache]: Analyzing trace with hash 1644310261, now seen corresponding path program 30 times [2020-09-04 17:47:26,737 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:47:26,737 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [145363700] [2020-09-04 17:47:26,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:47:26,746 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:47:26,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:47:29,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:47:29,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:47:29,128 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 17:47:29,128 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [145363700] [2020-09-04 17:47:29,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:47:29,129 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [66] imperfect sequences [] total 66 [2020-09-04 17:47:29,129 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129171758] [2020-09-04 17:47:29,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2020-09-04 17:47:29,129 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:47:29,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2020-09-04 17:47:29,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1090, Invalid=3200, Unknown=0, NotChecked=0, Total=4290 [2020-09-04 17:47:29,130 INFO L87 Difference]: Start difference. First operand 253 states and 255 transitions. Second operand 66 states. [2020-09-04 17:47:33,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:47:33,087 INFO L93 Difference]: Finished difference Result 290 states and 294 transitions. [2020-09-04 17:47:33,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2020-09-04 17:47:33,088 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 250 [2020-09-04 17:47:33,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:47:33,090 INFO L225 Difference]: With dead ends: 290 [2020-09-04 17:47:33,090 INFO L226 Difference]: Without dead ends: 265 [2020-09-04 17:47:33,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2882 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=5120, Invalid=11136, Unknown=0, NotChecked=0, Total=16256 [2020-09-04 17:47:33,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2020-09-04 17:47:33,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 260. [2020-09-04 17:47:33,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2020-09-04 17:47:33,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 262 transitions. [2020-09-04 17:47:33,096 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 262 transitions. Word has length 250 [2020-09-04 17:47:33,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:47:33,097 INFO L479 AbstractCegarLoop]: Abstraction has 260 states and 262 transitions. [2020-09-04 17:47:33,097 INFO L480 AbstractCegarLoop]: Interpolant automaton has 66 states. [2020-09-04 17:47:33,097 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 262 transitions. [2020-09-04 17:47:33,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2020-09-04 17:47:33,098 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:47:33,098 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 32, 32, 32, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:47:33,098 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-09-04 17:47:33,098 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:47:33,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:47:33,099 INFO L82 PathProgramCache]: Analyzing trace with hash -1767588604, now seen corresponding path program 31 times [2020-09-04 17:47:33,099 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:47:33,099 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1809844913] [2020-09-04 17:47:33,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:47:33,106 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:47:33,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:47:35,609 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:47:35,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:47:35,658 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 17:47:35,659 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1809844913] [2020-09-04 17:47:35,659 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:47:35,659 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2020-09-04 17:47:35,659 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385576489] [2020-09-04 17:47:35,659 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-09-04 17:47:35,660 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:47:35,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-09-04 17:47:35,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1157, Invalid=3399, Unknown=0, NotChecked=0, Total=4556 [2020-09-04 17:47:35,660 INFO L87 Difference]: Start difference. First operand 260 states and 262 transitions. Second operand 68 states. [2020-09-04 17:47:39,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:47:39,952 INFO L93 Difference]: Finished difference Result 297 states and 301 transitions. [2020-09-04 17:47:39,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-09-04 17:47:39,953 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 257 [2020-09-04 17:47:39,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:47:39,955 INFO L225 Difference]: With dead ends: 297 [2020-09-04 17:47:39,955 INFO L226 Difference]: Without dead ends: 272 [2020-09-04 17:47:39,956 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3071 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=5445, Invalid=11847, Unknown=0, NotChecked=0, Total=17292 [2020-09-04 17:47:39,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2020-09-04 17:47:39,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 267. [2020-09-04 17:47:39,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 267 states. [2020-09-04 17:47:39,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 269 transitions. [2020-09-04 17:47:39,963 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 269 transitions. Word has length 257 [2020-09-04 17:47:39,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:47:39,963 INFO L479 AbstractCegarLoop]: Abstraction has 267 states and 269 transitions. [2020-09-04 17:47:39,964 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-09-04 17:47:39,964 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 269 transitions. [2020-09-04 17:47:39,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2020-09-04 17:47:39,965 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:47:39,965 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 33, 33, 33, 33, 33, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:47:39,966 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-09-04 17:47:39,966 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:47:39,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:47:39,966 INFO L82 PathProgramCache]: Analyzing trace with hash 1155010581, now seen corresponding path program 32 times [2020-09-04 17:47:39,966 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:47:39,967 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [583749466] [2020-09-04 17:47:39,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:47:39,972 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:47:40,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:47:42,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:47:42,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:47:42,727 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 17:47:42,727 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [583749466] [2020-09-04 17:47:42,727 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:47:42,727 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [70] imperfect sequences [] total 70 [2020-09-04 17:47:42,727 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601430949] [2020-09-04 17:47:42,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2020-09-04 17:47:42,728 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:47:42,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2020-09-04 17:47:42,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1226, Invalid=3604, Unknown=0, NotChecked=0, Total=4830 [2020-09-04 17:47:42,729 INFO L87 Difference]: Start difference. First operand 267 states and 269 transitions. Second operand 70 states. [2020-09-04 17:47:47,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:47:47,375 INFO L93 Difference]: Finished difference Result 304 states and 308 transitions. [2020-09-04 17:47:47,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2020-09-04 17:47:47,376 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 264 [2020-09-04 17:47:47,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:47:47,378 INFO L225 Difference]: With dead ends: 304 [2020-09-04 17:47:47,378 INFO L226 Difference]: Without dead ends: 279 [2020-09-04 17:47:47,379 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3266 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=5780, Invalid=12580, Unknown=0, NotChecked=0, Total=18360 [2020-09-04 17:47:47,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2020-09-04 17:47:47,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 274. [2020-09-04 17:47:47,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2020-09-04 17:47:47,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 276 transitions. [2020-09-04 17:47:47,386 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 276 transitions. Word has length 264 [2020-09-04 17:47:47,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:47:47,387 INFO L479 AbstractCegarLoop]: Abstraction has 274 states and 276 transitions. [2020-09-04 17:47:47,387 INFO L480 AbstractCegarLoop]: Interpolant automaton has 70 states. [2020-09-04 17:47:47,387 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 276 transitions. [2020-09-04 17:47:47,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2020-09-04 17:47:47,389 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:47:47,389 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 34, 34, 34, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:47:47,389 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-09-04 17:47:47,389 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:47:47,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:47:47,390 INFO L82 PathProgramCache]: Analyzing trace with hash -1362798620, now seen corresponding path program 33 times [2020-09-04 17:47:47,390 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:47:47,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [649637436] [2020-09-04 17:47:47,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:47:47,399 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:47:47,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:47:50,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:47:50,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:47:50,434 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 17:47:50,435 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [649637436] [2020-09-04 17:47:50,435 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:47:50,435 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [72] imperfect sequences [] total 72 [2020-09-04 17:47:50,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416034673] [2020-09-04 17:47:50,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 72 states [2020-09-04 17:47:50,436 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:47:50,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2020-09-04 17:47:50,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1297, Invalid=3815, Unknown=0, NotChecked=0, Total=5112 [2020-09-04 17:47:50,437 INFO L87 Difference]: Start difference. First operand 274 states and 276 transitions. Second operand 72 states. [2020-09-04 17:47:55,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:47:55,330 INFO L93 Difference]: Finished difference Result 311 states and 315 transitions. [2020-09-04 17:47:55,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2020-09-04 17:47:55,331 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 271 [2020-09-04 17:47:55,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:47:55,333 INFO L225 Difference]: With dead ends: 311 [2020-09-04 17:47:55,333 INFO L226 Difference]: Without dead ends: 286 [2020-09-04 17:47:55,335 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3467 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=6125, Invalid=13335, Unknown=0, NotChecked=0, Total=19460 [2020-09-04 17:47:55,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2020-09-04 17:47:55,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 281. [2020-09-04 17:47:55,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 281 states. [2020-09-04 17:47:55,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 283 transitions. [2020-09-04 17:47:55,341 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 283 transitions. Word has length 271 [2020-09-04 17:47:55,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:47:55,342 INFO L479 AbstractCegarLoop]: Abstraction has 281 states and 283 transitions. [2020-09-04 17:47:55,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 72 states. [2020-09-04 17:47:55,342 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 283 transitions. [2020-09-04 17:47:55,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 279 [2020-09-04 17:47:55,344 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:47:55,344 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 35, 35, 35, 35, 35, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:47:55,344 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-09-04 17:47:55,344 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:47:55,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:47:55,345 INFO L82 PathProgramCache]: Analyzing trace with hash 582842677, now seen corresponding path program 34 times [2020-09-04 17:47:55,345 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:47:55,345 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [603617173] [2020-09-04 17:47:55,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:47:55,355 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:47:55,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:47:58,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:47:58,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:47:58,440 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 17:47:58,440 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [603617173] [2020-09-04 17:47:58,440 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:47:58,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [74] imperfect sequences [] total 74 [2020-09-04 17:47:58,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567992147] [2020-09-04 17:47:58,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2020-09-04 17:47:58,442 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:47:58,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2020-09-04 17:47:58,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1370, Invalid=4032, Unknown=0, NotChecked=0, Total=5402 [2020-09-04 17:47:58,443 INFO L87 Difference]: Start difference. First operand 281 states and 283 transitions. Second operand 74 states. [2020-09-04 17:48:03,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:48:03,578 INFO L93 Difference]: Finished difference Result 318 states and 322 transitions. [2020-09-04 17:48:03,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2020-09-04 17:48:03,579 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 278 [2020-09-04 17:48:03,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:48:03,580 INFO L225 Difference]: With dead ends: 318 [2020-09-04 17:48:03,580 INFO L226 Difference]: Without dead ends: 293 [2020-09-04 17:48:03,581 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3674 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=6480, Invalid=14112, Unknown=0, NotChecked=0, Total=20592 [2020-09-04 17:48:03,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2020-09-04 17:48:03,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 288. [2020-09-04 17:48:03,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-09-04 17:48:03,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 290 transitions. [2020-09-04 17:48:03,587 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 290 transitions. Word has length 278 [2020-09-04 17:48:03,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:48:03,587 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 290 transitions. [2020-09-04 17:48:03,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 74 states. [2020-09-04 17:48:03,587 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 290 transitions. [2020-09-04 17:48:03,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2020-09-04 17:48:03,588 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:48:03,588 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 36, 36, 36, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:48:03,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-09-04 17:48:03,589 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:48:03,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:48:03,589 INFO L82 PathProgramCache]: Analyzing trace with hash -1395823932, now seen corresponding path program 35 times [2020-09-04 17:48:03,589 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:48:03,589 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [980231878] [2020-09-04 17:48:03,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:48:03,601 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:48:03,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:48:06,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:48:06,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:48:06,940 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 17:48:06,940 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [980231878] [2020-09-04 17:48:06,941 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:48:06,941 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [76] imperfect sequences [] total 76 [2020-09-04 17:48:06,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747239474] [2020-09-04 17:48:06,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 76 states [2020-09-04 17:48:06,941 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:48:06,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2020-09-04 17:48:06,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1445, Invalid=4255, Unknown=0, NotChecked=0, Total=5700 [2020-09-04 17:48:06,942 INFO L87 Difference]: Start difference. First operand 288 states and 290 transitions. Second operand 76 states. [2020-09-04 17:48:12,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:48:12,511 INFO L93 Difference]: Finished difference Result 325 states and 329 transitions. [2020-09-04 17:48:12,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2020-09-04 17:48:12,512 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 285 [2020-09-04 17:48:12,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:48:12,514 INFO L225 Difference]: With dead ends: 325 [2020-09-04 17:48:12,514 INFO L226 Difference]: Without dead ends: 300 [2020-09-04 17:48:12,515 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3887 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=6845, Invalid=14911, Unknown=0, NotChecked=0, Total=21756 [2020-09-04 17:48:12,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2020-09-04 17:48:12,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 295. [2020-09-04 17:48:12,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 295 states. [2020-09-04 17:48:12,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 297 transitions. [2020-09-04 17:48:12,523 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 297 transitions. Word has length 285 [2020-09-04 17:48:12,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:48:12,523 INFO L479 AbstractCegarLoop]: Abstraction has 295 states and 297 transitions. [2020-09-04 17:48:12,523 INFO L480 AbstractCegarLoop]: Interpolant automaton has 76 states. [2020-09-04 17:48:12,523 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 297 transitions. [2020-09-04 17:48:12,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2020-09-04 17:48:12,525 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:48:12,525 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 37, 37, 37, 37, 37, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:48:12,525 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-09-04 17:48:12,525 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:48:12,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:48:12,526 INFO L82 PathProgramCache]: Analyzing trace with hash -2048628139, now seen corresponding path program 36 times [2020-09-04 17:48:12,526 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:48:12,526 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [885046741] [2020-09-04 17:48:12,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:48:12,538 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:48:12,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:48:16,059 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:48:16,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:48:16,109 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 17:48:16,110 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [885046741] [2020-09-04 17:48:16,110 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:48:16,110 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [78] imperfect sequences [] total 78 [2020-09-04 17:48:16,110 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1350515041] [2020-09-04 17:48:16,110 INFO L459 AbstractCegarLoop]: Interpolant automaton has 78 states [2020-09-04 17:48:16,111 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:48:16,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2020-09-04 17:48:16,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1522, Invalid=4484, Unknown=0, NotChecked=0, Total=6006 [2020-09-04 17:48:16,111 INFO L87 Difference]: Start difference. First operand 295 states and 297 transitions. Second operand 78 states. [2020-09-04 17:48:21,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:48:21,551 INFO L93 Difference]: Finished difference Result 332 states and 336 transitions. [2020-09-04 17:48:21,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2020-09-04 17:48:21,552 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 292 [2020-09-04 17:48:21,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:48:21,554 INFO L225 Difference]: With dead ends: 332 [2020-09-04 17:48:21,555 INFO L226 Difference]: Without dead ends: 307 [2020-09-04 17:48:21,556 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4106 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=7220, Invalid=15732, Unknown=0, NotChecked=0, Total=22952 [2020-09-04 17:48:21,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2020-09-04 17:48:21,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 302. [2020-09-04 17:48:21,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 302 states. [2020-09-04 17:48:21,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 304 transitions. [2020-09-04 17:48:21,576 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 304 transitions. Word has length 292 [2020-09-04 17:48:21,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:48:21,577 INFO L479 AbstractCegarLoop]: Abstraction has 302 states and 304 transitions. [2020-09-04 17:48:21,577 INFO L480 AbstractCegarLoop]: Interpolant automaton has 78 states. [2020-09-04 17:48:21,577 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 304 transitions. [2020-09-04 17:48:21,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-09-04 17:48:21,579 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:48:21,579 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 38, 38, 38, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:48:21,580 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-09-04 17:48:21,580 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:48:21,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:48:21,580 INFO L82 PathProgramCache]: Analyzing trace with hash -1974798940, now seen corresponding path program 37 times [2020-09-04 17:48:21,580 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:48:21,580 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [692062224] [2020-09-04 17:48:21,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:48:21,584 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:48:21,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:48:25,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:48:25,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:48:25,372 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 17:48:25,373 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [692062224] [2020-09-04 17:48:25,373 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:48:25,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [80] imperfect sequences [] total 80 [2020-09-04 17:48:25,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423666126] [2020-09-04 17:48:25,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2020-09-04 17:48:25,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:48:25,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2020-09-04 17:48:25,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1601, Invalid=4719, Unknown=0, NotChecked=0, Total=6320 [2020-09-04 17:48:25,374 INFO L87 Difference]: Start difference. First operand 302 states and 304 transitions. Second operand 80 states. [2020-09-04 17:48:31,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:48:31,662 INFO L93 Difference]: Finished difference Result 339 states and 343 transitions. [2020-09-04 17:48:31,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2020-09-04 17:48:31,663 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 299 [2020-09-04 17:48:31,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:48:31,666 INFO L225 Difference]: With dead ends: 339 [2020-09-04 17:48:31,666 INFO L226 Difference]: Without dead ends: 314 [2020-09-04 17:48:31,667 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4331 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=7605, Invalid=16575, Unknown=0, NotChecked=0, Total=24180 [2020-09-04 17:48:31,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2020-09-04 17:48:31,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 309. [2020-09-04 17:48:31,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 309 states. [2020-09-04 17:48:31,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 311 transitions. [2020-09-04 17:48:31,675 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 311 transitions. Word has length 299 [2020-09-04 17:48:31,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:48:31,675 INFO L479 AbstractCegarLoop]: Abstraction has 309 states and 311 transitions. [2020-09-04 17:48:31,675 INFO L480 AbstractCegarLoop]: Interpolant automaton has 80 states. [2020-09-04 17:48:31,675 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 311 transitions. [2020-09-04 17:48:31,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2020-09-04 17:48:31,677 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:48:31,677 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 39, 39, 39, 39, 39, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:48:31,677 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-09-04 17:48:31,678 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:48:31,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:48:31,678 INFO L82 PathProgramCache]: Analyzing trace with hash 956228469, now seen corresponding path program 38 times [2020-09-04 17:48:31,678 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:48:31,678 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1019648036] [2020-09-04 17:48:31,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:48:31,686 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:48:31,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:48:35,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:48:35,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:48:35,706 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 17:48:35,706 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1019648036] [2020-09-04 17:48:35,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:48:35,707 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [82] imperfect sequences [] total 82 [2020-09-04 17:48:35,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524544536] [2020-09-04 17:48:35,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 82 states [2020-09-04 17:48:35,707 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:48:35,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2020-09-04 17:48:35,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1682, Invalid=4960, Unknown=0, NotChecked=0, Total=6642 [2020-09-04 17:48:35,708 INFO L87 Difference]: Start difference. First operand 309 states and 311 transitions. Second operand 82 states. [2020-09-04 17:48:42,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:48:42,607 INFO L93 Difference]: Finished difference Result 346 states and 350 transitions. [2020-09-04 17:48:42,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2020-09-04 17:48:42,608 INFO L78 Accepts]: Start accepts. Automaton has 82 states. Word has length 306 [2020-09-04 17:48:42,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:48:42,610 INFO L225 Difference]: With dead ends: 346 [2020-09-04 17:48:42,611 INFO L226 Difference]: Without dead ends: 321 [2020-09-04 17:48:42,612 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4562 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=8000, Invalid=17440, Unknown=0, NotChecked=0, Total=25440 [2020-09-04 17:48:42,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2020-09-04 17:48:42,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 316. [2020-09-04 17:48:42,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2020-09-04 17:48:42,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 318 transitions. [2020-09-04 17:48:42,619 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 318 transitions. Word has length 306 [2020-09-04 17:48:42,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:48:42,619 INFO L479 AbstractCegarLoop]: Abstraction has 316 states and 318 transitions. [2020-09-04 17:48:42,619 INFO L480 AbstractCegarLoop]: Interpolant automaton has 82 states. [2020-09-04 17:48:42,620 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 318 transitions. [2020-09-04 17:48:42,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 314 [2020-09-04 17:48:42,621 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:48:42,622 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 40, 40, 40, 40, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:48:42,622 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-09-04 17:48:42,622 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:48:42,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:48:42,623 INFO L82 PathProgramCache]: Analyzing trace with hash 1884027012, now seen corresponding path program 39 times [2020-09-04 17:48:42,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:48:42,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [621486078] [2020-09-04 17:48:42,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:48:42,627 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:48:42,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:48:47,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:48:47,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:48:47,109 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 17:48:47,110 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [621486078] [2020-09-04 17:48:47,110 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:48:47,110 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [84] imperfect sequences [] total 84 [2020-09-04 17:48:47,110 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735292089] [2020-09-04 17:48:47,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 84 states [2020-09-04 17:48:47,111 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:48:47,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2020-09-04 17:48:47,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1765, Invalid=5207, Unknown=0, NotChecked=0, Total=6972 [2020-09-04 17:48:47,111 INFO L87 Difference]: Start difference. First operand 316 states and 318 transitions. Second operand 84 states. [2020-09-04 17:48:53,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:48:53,797 INFO L93 Difference]: Finished difference Result 353 states and 357 transitions. [2020-09-04 17:48:53,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2020-09-04 17:48:53,798 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 313 [2020-09-04 17:48:53,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:48:53,800 INFO L225 Difference]: With dead ends: 353 [2020-09-04 17:48:53,800 INFO L226 Difference]: Without dead ends: 328 [2020-09-04 17:48:53,801 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4799 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=8405, Invalid=18327, Unknown=0, NotChecked=0, Total=26732 [2020-09-04 17:48:53,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2020-09-04 17:48:53,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 323. [2020-09-04 17:48:53,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 323 states. [2020-09-04 17:48:53,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 325 transitions. [2020-09-04 17:48:53,812 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 325 transitions. Word has length 313 [2020-09-04 17:48:53,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:48:53,812 INFO L479 AbstractCegarLoop]: Abstraction has 323 states and 325 transitions. [2020-09-04 17:48:53,813 INFO L480 AbstractCegarLoop]: Interpolant automaton has 84 states. [2020-09-04 17:48:53,813 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 325 transitions. [2020-09-04 17:48:53,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2020-09-04 17:48:53,814 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:48:53,815 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 41, 41, 41, 41, 41, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:48:53,815 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-09-04 17:48:53,815 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:48:53,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:48:53,816 INFO L82 PathProgramCache]: Analyzing trace with hash 1732174997, now seen corresponding path program 40 times [2020-09-04 17:48:53,816 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:48:53,816 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1979077680] [2020-09-04 17:48:53,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:48:53,822 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:48:53,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:48:58,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:48:58,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:48:58,500 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 17:48:58,501 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1979077680] [2020-09-04 17:48:58,501 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:48:58,501 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [86] imperfect sequences [] total 86 [2020-09-04 17:48:58,501 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993322306] [2020-09-04 17:48:58,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2020-09-04 17:48:58,502 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:48:58,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2020-09-04 17:48:58,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1850, Invalid=5460, Unknown=0, NotChecked=0, Total=7310 [2020-09-04 17:48:58,502 INFO L87 Difference]: Start difference. First operand 323 states and 325 transitions. Second operand 86 states. [2020-09-04 17:49:05,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:49:05,988 INFO L93 Difference]: Finished difference Result 360 states and 364 transitions. [2020-09-04 17:49:05,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2020-09-04 17:49:05,989 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 320 [2020-09-04 17:49:05,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:49:05,991 INFO L225 Difference]: With dead ends: 360 [2020-09-04 17:49:05,991 INFO L226 Difference]: Without dead ends: 335 [2020-09-04 17:49:05,992 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5042 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=8820, Invalid=19236, Unknown=0, NotChecked=0, Total=28056 [2020-09-04 17:49:05,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2020-09-04 17:49:05,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 330. [2020-09-04 17:49:05,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 330 states. [2020-09-04 17:49:06,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 332 transitions. [2020-09-04 17:49:06,000 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 332 transitions. Word has length 320 [2020-09-04 17:49:06,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:49:06,000 INFO L479 AbstractCegarLoop]: Abstraction has 330 states and 332 transitions. [2020-09-04 17:49:06,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 86 states. [2020-09-04 17:49:06,000 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 332 transitions. [2020-09-04 17:49:06,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2020-09-04 17:49:06,002 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:49:06,003 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 42, 42, 42, 42, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:49:06,003 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-09-04 17:49:06,003 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:49:06,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:49:06,003 INFO L82 PathProgramCache]: Analyzing trace with hash -1755417756, now seen corresponding path program 41 times [2020-09-04 17:49:06,003 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:49:06,004 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [463138655] [2020-09-04 17:49:06,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:49:06,013 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:49:06,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:49:10,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:49:10,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:49:10,757 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 17:49:10,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [463138655] [2020-09-04 17:49:10,757 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:49:10,757 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [88] imperfect sequences [] total 88 [2020-09-04 17:49:10,757 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207493076] [2020-09-04 17:49:10,758 INFO L459 AbstractCegarLoop]: Interpolant automaton has 88 states [2020-09-04 17:49:10,758 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:49:10,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2020-09-04 17:49:10,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1937, Invalid=5719, Unknown=0, NotChecked=0, Total=7656 [2020-09-04 17:49:10,759 INFO L87 Difference]: Start difference. First operand 330 states and 332 transitions. Second operand 88 states. [2020-09-04 17:49:18,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:49:18,416 INFO L93 Difference]: Finished difference Result 367 states and 371 transitions. [2020-09-04 17:49:18,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2020-09-04 17:49:18,417 INFO L78 Accepts]: Start accepts. Automaton has 88 states. Word has length 327 [2020-09-04 17:49:18,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:49:18,418 INFO L225 Difference]: With dead ends: 367 [2020-09-04 17:49:18,418 INFO L226 Difference]: Without dead ends: 342 [2020-09-04 17:49:18,420 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5291 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=9245, Invalid=20167, Unknown=0, NotChecked=0, Total=29412 [2020-09-04 17:49:18,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2020-09-04 17:49:18,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 337. [2020-09-04 17:49:18,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 337 states. [2020-09-04 17:49:18,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 339 transitions. [2020-09-04 17:49:18,426 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 339 transitions. Word has length 327 [2020-09-04 17:49:18,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:49:18,426 INFO L479 AbstractCegarLoop]: Abstraction has 337 states and 339 transitions. [2020-09-04 17:49:18,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 88 states. [2020-09-04 17:49:18,426 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 339 transitions. [2020-09-04 17:49:18,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2020-09-04 17:49:18,427 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:49:18,428 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 43, 43, 43, 43, 43, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:49:18,428 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-09-04 17:49:18,428 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:49:18,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:49:18,428 INFO L82 PathProgramCache]: Analyzing trace with hash -1135186507, now seen corresponding path program 42 times [2020-09-04 17:49:18,428 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:49:18,428 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1741833037] [2020-09-04 17:49:18,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:49:18,433 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:49:18,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:49:23,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:49:23,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:49:23,659 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 17:49:23,660 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1741833037] [2020-09-04 17:49:23,660 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:49:23,660 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [90] imperfect sequences [] total 90 [2020-09-04 17:49:23,660 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1797961385] [2020-09-04 17:49:23,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 90 states [2020-09-04 17:49:23,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:49:23,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2020-09-04 17:49:23,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2026, Invalid=5984, Unknown=0, NotChecked=0, Total=8010 [2020-09-04 17:49:23,662 INFO L87 Difference]: Start difference. First operand 337 states and 339 transitions. Second operand 90 states. [2020-09-04 17:49:32,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:49:32,086 INFO L93 Difference]: Finished difference Result 374 states and 378 transitions. [2020-09-04 17:49:32,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2020-09-04 17:49:32,087 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 334 [2020-09-04 17:49:32,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:49:32,088 INFO L225 Difference]: With dead ends: 374 [2020-09-04 17:49:32,088 INFO L226 Difference]: Without dead ends: 349 [2020-09-04 17:49:32,090 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5546 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=9680, Invalid=21120, Unknown=0, NotChecked=0, Total=30800 [2020-09-04 17:49:32,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2020-09-04 17:49:32,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 344. [2020-09-04 17:49:32,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 344 states. [2020-09-04 17:49:32,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 346 transitions. [2020-09-04 17:49:32,098 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 346 transitions. Word has length 334 [2020-09-04 17:49:32,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:49:32,099 INFO L479 AbstractCegarLoop]: Abstraction has 344 states and 346 transitions. [2020-09-04 17:49:32,099 INFO L480 AbstractCegarLoop]: Interpolant automaton has 90 states. [2020-09-04 17:49:32,099 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 346 transitions. [2020-09-04 17:49:32,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 342 [2020-09-04 17:49:32,101 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:49:32,101 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 44, 44, 44, 44, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:49:32,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-09-04 17:49:32,102 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:49:32,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:49:32,102 INFO L82 PathProgramCache]: Analyzing trace with hash 663774788, now seen corresponding path program 43 times [2020-09-04 17:49:32,102 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:49:32,102 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [182199755] [2020-09-04 17:49:32,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:49:32,112 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:49:32,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:49:37,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:49:37,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:49:37,904 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 17:49:37,905 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [182199755] [2020-09-04 17:49:37,905 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:49:37,905 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [92] imperfect sequences [] total 92 [2020-09-04 17:49:37,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499813158] [2020-09-04 17:49:37,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2020-09-04 17:49:37,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:49:37,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2020-09-04 17:49:37,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2117, Invalid=6255, Unknown=0, NotChecked=0, Total=8372 [2020-09-04 17:49:37,906 INFO L87 Difference]: Start difference. First operand 344 states and 346 transitions. Second operand 92 states. [2020-09-04 17:49:47,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:49:47,763 INFO L93 Difference]: Finished difference Result 381 states and 385 transitions. [2020-09-04 17:49:47,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2020-09-04 17:49:47,764 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 341 [2020-09-04 17:49:47,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:49:47,766 INFO L225 Difference]: With dead ends: 381 [2020-09-04 17:49:47,767 INFO L226 Difference]: Without dead ends: 356 [2020-09-04 17:49:47,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5807 ImplicationChecksByTransitivity, 13.8s TimeCoverageRelationStatistics Valid=10125, Invalid=22095, Unknown=0, NotChecked=0, Total=32220 [2020-09-04 17:49:47,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2020-09-04 17:49:47,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 351. [2020-09-04 17:49:47,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 351 states. [2020-09-04 17:49:47,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 353 transitions. [2020-09-04 17:49:47,777 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 353 transitions. Word has length 341 [2020-09-04 17:49:47,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:49:47,778 INFO L479 AbstractCegarLoop]: Abstraction has 351 states and 353 transitions. [2020-09-04 17:49:47,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 92 states. [2020-09-04 17:49:47,778 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 353 transitions. [2020-09-04 17:49:47,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 349 [2020-09-04 17:49:47,780 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:49:47,780 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 45, 45, 45, 45, 45, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:49:47,780 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-09-04 17:49:47,781 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:49:47,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:49:47,781 INFO L82 PathProgramCache]: Analyzing trace with hash -2072543531, now seen corresponding path program 44 times [2020-09-04 17:49:47,781 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:49:47,781 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1988584020] [2020-09-04 17:49:47,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:49:47,793 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:49:47,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:49:54,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:49:54,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:49:54,329 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 17:49:54,329 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1988584020] [2020-09-04 17:49:54,329 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:49:54,330 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [94] imperfect sequences [] total 94 [2020-09-04 17:49:54,330 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1367059402] [2020-09-04 17:49:54,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 94 states [2020-09-04 17:49:54,330 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:49:54,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2020-09-04 17:49:54,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2210, Invalid=6532, Unknown=0, NotChecked=0, Total=8742 [2020-09-04 17:49:54,331 INFO L87 Difference]: Start difference. First operand 351 states and 353 transitions. Second operand 94 states. [2020-09-04 17:50:05,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:50:05,002 INFO L93 Difference]: Finished difference Result 388 states and 392 transitions. [2020-09-04 17:50:05,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2020-09-04 17:50:05,004 INFO L78 Accepts]: Start accepts. Automaton has 94 states. Word has length 348 [2020-09-04 17:50:05,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:50:05,006 INFO L225 Difference]: With dead ends: 388 [2020-09-04 17:50:05,006 INFO L226 Difference]: Without dead ends: 363 [2020-09-04 17:50:05,009 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6074 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=10580, Invalid=23092, Unknown=0, NotChecked=0, Total=33672 [2020-09-04 17:50:05,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 363 states. [2020-09-04 17:50:05,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 363 to 358. [2020-09-04 17:50:05,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 358 states. [2020-09-04 17:50:05,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 358 states to 358 states and 360 transitions. [2020-09-04 17:50:05,016 INFO L78 Accepts]: Start accepts. Automaton has 358 states and 360 transitions. Word has length 348 [2020-09-04 17:50:05,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:50:05,016 INFO L479 AbstractCegarLoop]: Abstraction has 358 states and 360 transitions. [2020-09-04 17:50:05,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 94 states. [2020-09-04 17:50:05,016 INFO L276 IsEmpty]: Start isEmpty. Operand 358 states and 360 transitions. [2020-09-04 17:50:05,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 356 [2020-09-04 17:50:05,018 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:50:05,019 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 46, 46, 46, 46, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:50:05,019 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-09-04 17:50:05,019 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:50:05,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:50:05,020 INFO L82 PathProgramCache]: Analyzing trace with hash 409981220, now seen corresponding path program 45 times [2020-09-04 17:50:05,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:50:05,020 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [290203372] [2020-09-04 17:50:05,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:50:05,028 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:50:05,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:50:11,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:50:11,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:50:11,520 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 17:50:11,521 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [290203372] [2020-09-04 17:50:11,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:50:11,521 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [96] imperfect sequences [] total 96 [2020-09-04 17:50:11,521 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1949160624] [2020-09-04 17:50:11,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-09-04 17:50:11,521 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:50:11,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-09-04 17:50:11,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2305, Invalid=6815, Unknown=0, NotChecked=0, Total=9120 [2020-09-04 17:50:11,522 INFO L87 Difference]: Start difference. First operand 358 states and 360 transitions. Second operand 96 states. [2020-09-04 17:50:21,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:50:21,511 INFO L93 Difference]: Finished difference Result 395 states and 399 transitions. [2020-09-04 17:50:21,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2020-09-04 17:50:21,513 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 355 [2020-09-04 17:50:21,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:50:21,514 INFO L225 Difference]: With dead ends: 395 [2020-09-04 17:50:21,514 INFO L226 Difference]: Without dead ends: 370 [2020-09-04 17:50:21,516 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6347 ImplicationChecksByTransitivity, 15.1s TimeCoverageRelationStatistics Valid=11045, Invalid=24111, Unknown=0, NotChecked=0, Total=35156 [2020-09-04 17:50:21,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2020-09-04 17:50:21,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 365. [2020-09-04 17:50:21,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 365 states. [2020-09-04 17:50:21,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 365 states to 365 states and 367 transitions. [2020-09-04 17:50:21,525 INFO L78 Accepts]: Start accepts. Automaton has 365 states and 367 transitions. Word has length 355 [2020-09-04 17:50:21,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:50:21,525 INFO L479 AbstractCegarLoop]: Abstraction has 365 states and 367 transitions. [2020-09-04 17:50:21,525 INFO L480 AbstractCegarLoop]: Interpolant automaton has 96 states. [2020-09-04 17:50:21,525 INFO L276 IsEmpty]: Start isEmpty. Operand 365 states and 367 transitions. [2020-09-04 17:50:21,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 363 [2020-09-04 17:50:21,527 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:50:21,528 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 47, 47, 47, 47, 47, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:50:21,528 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-09-04 17:50:21,528 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:50:21,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:50:21,529 INFO L82 PathProgramCache]: Analyzing trace with hash -866904075, now seen corresponding path program 46 times [2020-09-04 17:50:21,529 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:50:21,529 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [767938030] [2020-09-04 17:50:21,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:50:21,534 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:50:21,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:50:28,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:50:28,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:50:28,239 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 17:50:28,239 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [767938030] [2020-09-04 17:50:28,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:50:28,239 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [98] imperfect sequences [] total 98 [2020-09-04 17:50:28,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040836299] [2020-09-04 17:50:28,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2020-09-04 17:50:28,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:50:28,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2020-09-04 17:50:28,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2402, Invalid=7104, Unknown=0, NotChecked=0, Total=9506 [2020-09-04 17:50:28,241 INFO L87 Difference]: Start difference. First operand 365 states and 367 transitions. Second operand 98 states. [2020-09-04 17:50:38,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:50:38,289 INFO L93 Difference]: Finished difference Result 402 states and 406 transitions. [2020-09-04 17:50:38,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 145 states. [2020-09-04 17:50:38,290 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 362 [2020-09-04 17:50:38,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:50:38,294 INFO L225 Difference]: With dead ends: 402 [2020-09-04 17:50:38,294 INFO L226 Difference]: Without dead ends: 377 [2020-09-04 17:50:38,295 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6626 ImplicationChecksByTransitivity, 15.3s TimeCoverageRelationStatistics Valid=11520, Invalid=25152, Unknown=0, NotChecked=0, Total=36672 [2020-09-04 17:50:38,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2020-09-04 17:50:38,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 372. [2020-09-04 17:50:38,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 372 states. [2020-09-04 17:50:38,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 374 transitions. [2020-09-04 17:50:38,301 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 374 transitions. Word has length 362 [2020-09-04 17:50:38,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:50:38,301 INFO L479 AbstractCegarLoop]: Abstraction has 372 states and 374 transitions. [2020-09-04 17:50:38,301 INFO L480 AbstractCegarLoop]: Interpolant automaton has 98 states. [2020-09-04 17:50:38,302 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 374 transitions. [2020-09-04 17:50:38,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 370 [2020-09-04 17:50:38,304 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:50:38,304 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 48, 48, 48, 48, 48, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:50:38,304 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-09-04 17:50:38,304 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:50:38,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:50:38,305 INFO L82 PathProgramCache]: Analyzing trace with hash 285914116, now seen corresponding path program 47 times [2020-09-04 17:50:38,305 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:50:38,305 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1831802737] [2020-09-04 17:50:38,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:50:38,315 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:50:38,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:50:45,067 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:50:45,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:50:45,162 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 17:50:45,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1831802737] [2020-09-04 17:50:45,162 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:50:45,162 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [100] imperfect sequences [] total 100 [2020-09-04 17:50:45,163 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234665535] [2020-09-04 17:50:45,163 INFO L459 AbstractCegarLoop]: Interpolant automaton has 100 states [2020-09-04 17:50:45,163 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:50:45,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2020-09-04 17:50:45,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2501, Invalid=7399, Unknown=0, NotChecked=0, Total=9900 [2020-09-04 17:50:45,165 INFO L87 Difference]: Start difference. First operand 372 states and 374 transitions. Second operand 100 states. [2020-09-04 17:50:56,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:50:56,371 INFO L93 Difference]: Finished difference Result 409 states and 413 transitions. [2020-09-04 17:50:56,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 148 states. [2020-09-04 17:50:56,372 INFO L78 Accepts]: Start accepts. Automaton has 100 states. Word has length 369 [2020-09-04 17:50:56,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:50:56,375 INFO L225 Difference]: With dead ends: 409 [2020-09-04 17:50:56,375 INFO L226 Difference]: Without dead ends: 384 [2020-09-04 17:50:56,377 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6911 ImplicationChecksByTransitivity, 16.0s TimeCoverageRelationStatistics Valid=12005, Invalid=26215, Unknown=0, NotChecked=0, Total=38220 [2020-09-04 17:50:56,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 384 states. [2020-09-04 17:50:56,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 384 to 379. [2020-09-04 17:50:56,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 379 states. [2020-09-04 17:50:56,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 381 transitions. [2020-09-04 17:50:56,383 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 381 transitions. Word has length 369 [2020-09-04 17:50:56,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:50:56,384 INFO L479 AbstractCegarLoop]: Abstraction has 379 states and 381 transitions. [2020-09-04 17:50:56,384 INFO L480 AbstractCegarLoop]: Interpolant automaton has 100 states. [2020-09-04 17:50:56,384 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 381 transitions. [2020-09-04 17:50:56,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 377 [2020-09-04 17:50:56,386 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:50:56,386 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 49, 49, 49, 49, 49, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:50:56,386 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-09-04 17:50:56,386 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:50:56,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:50:56,386 INFO L82 PathProgramCache]: Analyzing trace with hash -2128725739, now seen corresponding path program 48 times [2020-09-04 17:50:56,387 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:50:56,387 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1695144824] [2020-09-04 17:50:56,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:50:56,391 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:50:56,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:51:03,598 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:51:03,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:51:03,693 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 17:51:03,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1695144824] [2020-09-04 17:51:03,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:51:03,693 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [102] imperfect sequences [] total 102 [2020-09-04 17:51:03,693 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231888224] [2020-09-04 17:51:03,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 102 states [2020-09-04 17:51:03,694 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:51:03,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2020-09-04 17:51:03,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2602, Invalid=7700, Unknown=0, NotChecked=0, Total=10302 [2020-09-04 17:51:03,695 INFO L87 Difference]: Start difference. First operand 379 states and 381 transitions. Second operand 102 states. [2020-09-04 17:51:15,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:51:15,219 INFO L93 Difference]: Finished difference Result 416 states and 420 transitions. [2020-09-04 17:51:15,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2020-09-04 17:51:15,221 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 376 [2020-09-04 17:51:15,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:51:15,223 INFO L225 Difference]: With dead ends: 416 [2020-09-04 17:51:15,224 INFO L226 Difference]: Without dead ends: 391 [2020-09-04 17:51:15,225 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7202 ImplicationChecksByTransitivity, 17.3s TimeCoverageRelationStatistics Valid=12500, Invalid=27300, Unknown=0, NotChecked=0, Total=39800 [2020-09-04 17:51:15,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 391 states. [2020-09-04 17:51:15,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 386. [2020-09-04 17:51:15,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 386 states. [2020-09-04 17:51:15,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 386 states to 386 states and 388 transitions. [2020-09-04 17:51:15,231 INFO L78 Accepts]: Start accepts. Automaton has 386 states and 388 transitions. Word has length 376 [2020-09-04 17:51:15,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:51:15,232 INFO L479 AbstractCegarLoop]: Abstraction has 386 states and 388 transitions. [2020-09-04 17:51:15,232 INFO L480 AbstractCegarLoop]: Interpolant automaton has 102 states. [2020-09-04 17:51:15,232 INFO L276 IsEmpty]: Start isEmpty. Operand 386 states and 388 transitions. [2020-09-04 17:51:15,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 384 [2020-09-04 17:51:15,234 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:51:15,235 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 50, 50, 50, 50, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:51:15,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-09-04 17:51:15,235 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:51:15,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:51:15,235 INFO L82 PathProgramCache]: Analyzing trace with hash 1206849252, now seen corresponding path program 49 times [2020-09-04 17:51:15,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:51:15,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [737705747] [2020-09-04 17:51:15,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:51:15,246 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:51:15,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:51:22,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:51:22,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:51:23,076 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 17:51:23,077 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [737705747] [2020-09-04 17:51:23,077 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:51:23,077 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [104] imperfect sequences [] total 104 [2020-09-04 17:51:23,077 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452176779] [2020-09-04 17:51:23,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2020-09-04 17:51:23,078 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:51:23,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2020-09-04 17:51:23,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2705, Invalid=8007, Unknown=0, NotChecked=0, Total=10712 [2020-09-04 17:51:23,078 INFO L87 Difference]: Start difference. First operand 386 states and 388 transitions. Second operand 104 states. [2020-09-04 17:51:35,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:51:35,936 INFO L93 Difference]: Finished difference Result 423 states and 427 transitions. [2020-09-04 17:51:35,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 154 states. [2020-09-04 17:51:35,937 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 383 [2020-09-04 17:51:35,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:51:35,939 INFO L225 Difference]: With dead ends: 423 [2020-09-04 17:51:35,940 INFO L226 Difference]: Without dead ends: 398 [2020-09-04 17:51:35,941 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 202 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7499 ImplicationChecksByTransitivity, 18.5s TimeCoverageRelationStatistics Valid=13005, Invalid=28407, Unknown=0, NotChecked=0, Total=41412 [2020-09-04 17:51:35,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2020-09-04 17:51:35,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 393. [2020-09-04 17:51:35,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 393 states. [2020-09-04 17:51:35,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 393 states to 393 states and 395 transitions. [2020-09-04 17:51:35,947 INFO L78 Accepts]: Start accepts. Automaton has 393 states and 395 transitions. Word has length 383 [2020-09-04 17:51:35,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:51:35,947 INFO L479 AbstractCegarLoop]: Abstraction has 393 states and 395 transitions. [2020-09-04 17:51:35,947 INFO L480 AbstractCegarLoop]: Interpolant automaton has 104 states. [2020-09-04 17:51:35,947 INFO L276 IsEmpty]: Start isEmpty. Operand 393 states and 395 transitions. [2020-09-04 17:51:35,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 391 [2020-09-04 17:51:35,949 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:51:35,949 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 51, 51, 51, 51, 51, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:51:35,949 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-09-04 17:51:35,949 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:51:35,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:51:35,950 INFO L82 PathProgramCache]: Analyzing trace with hash -1870142923, now seen corresponding path program 50 times [2020-09-04 17:51:35,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:51:35,950 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1898404555] [2020-09-04 17:51:35,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:51:35,959 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:51:36,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:51:44,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:51:44,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:51:44,467 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 17:51:44,467 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1898404555] [2020-09-04 17:51:44,467 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:51:44,468 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [106] imperfect sequences [] total 106 [2020-09-04 17:51:44,468 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455302087] [2020-09-04 17:51:44,468 INFO L459 AbstractCegarLoop]: Interpolant automaton has 106 states [2020-09-04 17:51:44,468 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:51:44,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2020-09-04 17:51:44,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2810, Invalid=8320, Unknown=0, NotChecked=0, Total=11130 [2020-09-04 17:51:44,470 INFO L87 Difference]: Start difference. First operand 393 states and 395 transitions. Second operand 106 states. [2020-09-04 17:51:58,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:51:58,073 INFO L93 Difference]: Finished difference Result 430 states and 434 transitions. [2020-09-04 17:51:58,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 157 states. [2020-09-04 17:51:58,075 INFO L78 Accepts]: Start accepts. Automaton has 106 states. Word has length 390 [2020-09-04 17:51:58,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:51:58,077 INFO L225 Difference]: With dead ends: 430 [2020-09-04 17:51:58,077 INFO L226 Difference]: Without dead ends: 405 [2020-09-04 17:51:58,079 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7802 ImplicationChecksByTransitivity, 20.2s TimeCoverageRelationStatistics Valid=13520, Invalid=29536, Unknown=0, NotChecked=0, Total=43056 [2020-09-04 17:51:58,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 405 states. [2020-09-04 17:51:58,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 405 to 400. [2020-09-04 17:51:58,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400 states. [2020-09-04 17:51:58,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 402 transitions. [2020-09-04 17:51:58,085 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 402 transitions. Word has length 390 [2020-09-04 17:51:58,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:51:58,086 INFO L479 AbstractCegarLoop]: Abstraction has 400 states and 402 transitions. [2020-09-04 17:51:58,086 INFO L480 AbstractCegarLoop]: Interpolant automaton has 106 states. [2020-09-04 17:51:58,086 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 402 transitions. [2020-09-04 17:51:58,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 398 [2020-09-04 17:51:58,087 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:51:58,088 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 52, 52, 52, 52, 52, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:51:58,088 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-09-04 17:51:58,088 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:51:58,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:51:58,088 INFO L82 PathProgramCache]: Analyzing trace with hash 1663754692, now seen corresponding path program 51 times [2020-09-04 17:51:58,088 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:51:58,088 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1349293747] [2020-09-04 17:51:58,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:51:58,093 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:51:58,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:52:07,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:52:07,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:52:07,322 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 17:52:07,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1349293747] [2020-09-04 17:52:07,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:52:07,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [108] imperfect sequences [] total 108 [2020-09-04 17:52:07,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213141110] [2020-09-04 17:52:07,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 108 states [2020-09-04 17:52:07,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:52:07,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2020-09-04 17:52:07,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2917, Invalid=8639, Unknown=0, NotChecked=0, Total=11556 [2020-09-04 17:52:07,325 INFO L87 Difference]: Start difference. First operand 400 states and 402 transitions. Second operand 108 states. [2020-09-04 17:52:22,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:52:22,569 INFO L93 Difference]: Finished difference Result 437 states and 441 transitions. [2020-09-04 17:52:22,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 160 states. [2020-09-04 17:52:22,571 INFO L78 Accepts]: Start accepts. Automaton has 108 states. Word has length 397 [2020-09-04 17:52:22,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:52:22,574 INFO L225 Difference]: With dead ends: 437 [2020-09-04 17:52:22,574 INFO L226 Difference]: Without dead ends: 412 [2020-09-04 17:52:22,576 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 210 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8111 ImplicationChecksByTransitivity, 22.0s TimeCoverageRelationStatistics Valid=14045, Invalid=30687, Unknown=0, NotChecked=0, Total=44732 [2020-09-04 17:52:22,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 412 states. [2020-09-04 17:52:22,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 412 to 407. [2020-09-04 17:52:22,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 407 states. [2020-09-04 17:52:22,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 409 transitions. [2020-09-04 17:52:22,582 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 409 transitions. Word has length 397 [2020-09-04 17:52:22,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:52:22,596 INFO L479 AbstractCegarLoop]: Abstraction has 407 states and 409 transitions. [2020-09-04 17:52:22,596 INFO L480 AbstractCegarLoop]: Interpolant automaton has 108 states. [2020-09-04 17:52:22,596 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 409 transitions. [2020-09-04 17:52:22,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 405 [2020-09-04 17:52:22,598 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:52:22,598 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 53, 53, 53, 53, 53, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:52:22,598 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-09-04 17:52:22,598 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:52:22,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:52:22,599 INFO L82 PathProgramCache]: Analyzing trace with hash 147002197, now seen corresponding path program 52 times [2020-09-04 17:52:22,599 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:52:22,599 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1857793958] [2020-09-04 17:52:22,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:52:22,608 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:52:22,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:52:32,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:52:32,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:52:32,814 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 17:52:32,814 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1857793958] [2020-09-04 17:52:32,814 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:52:32,815 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [110] imperfect sequences [] total 110 [2020-09-04 17:52:32,815 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090769057] [2020-09-04 17:52:32,815 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2020-09-04 17:52:32,815 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:52:32,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2020-09-04 17:52:32,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3026, Invalid=8964, Unknown=0, NotChecked=0, Total=11990 [2020-09-04 17:52:32,816 INFO L87 Difference]: Start difference. First operand 407 states and 409 transitions. Second operand 110 states. [2020-09-04 17:52:49,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:52:49,694 INFO L93 Difference]: Finished difference Result 444 states and 448 transitions. [2020-09-04 17:52:49,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 163 states. [2020-09-04 17:52:49,696 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 404 [2020-09-04 17:52:49,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:52:49,699 INFO L225 Difference]: With dead ends: 444 [2020-09-04 17:52:49,699 INFO L226 Difference]: Without dead ends: 419 [2020-09-04 17:52:49,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 214 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8426 ImplicationChecksByTransitivity, 24.4s TimeCoverageRelationStatistics Valid=14580, Invalid=31860, Unknown=0, NotChecked=0, Total=46440 [2020-09-04 17:52:49,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2020-09-04 17:52:49,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 414. [2020-09-04 17:52:49,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 414 states. [2020-09-04 17:52:49,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 416 transitions. [2020-09-04 17:52:49,707 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 416 transitions. Word has length 404 [2020-09-04 17:52:49,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:52:49,707 INFO L479 AbstractCegarLoop]: Abstraction has 414 states and 416 transitions. [2020-09-04 17:52:49,707 INFO L480 AbstractCegarLoop]: Interpolant automaton has 110 states. [2020-09-04 17:52:49,707 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 416 transitions. [2020-09-04 17:52:49,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 412 [2020-09-04 17:52:49,709 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:52:49,709 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 54, 54, 54, 54, 54, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:52:49,709 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-09-04 17:52:49,709 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:52:49,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:52:49,710 INFO L82 PathProgramCache]: Analyzing trace with hash 1481387172, now seen corresponding path program 53 times [2020-09-04 17:52:49,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:52:49,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1953255350] [2020-09-04 17:52:49,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:52:49,715 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:52:49,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:53:00,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:53:00,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:53:00,795 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 17:53:00,795 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1953255350] [2020-09-04 17:53:00,795 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:53:00,795 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [112] imperfect sequences [] total 112 [2020-09-04 17:53:00,796 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231452633] [2020-09-04 17:53:00,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 112 states [2020-09-04 17:53:00,796 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:53:00,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2020-09-04 17:53:00,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3137, Invalid=9295, Unknown=0, NotChecked=0, Total=12432 [2020-09-04 17:53:00,797 INFO L87 Difference]: Start difference. First operand 414 states and 416 transitions. Second operand 112 states. [2020-09-04 17:53:19,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:53:19,347 INFO L93 Difference]: Finished difference Result 451 states and 455 transitions. [2020-09-04 17:53:19,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 166 states. [2020-09-04 17:53:19,349 INFO L78 Accepts]: Start accepts. Automaton has 112 states. Word has length 411 [2020-09-04 17:53:19,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:53:19,351 INFO L225 Difference]: With dead ends: 451 [2020-09-04 17:53:19,351 INFO L226 Difference]: Without dead ends: 426 [2020-09-04 17:53:19,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 218 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8747 ImplicationChecksByTransitivity, 26.8s TimeCoverageRelationStatistics Valid=15125, Invalid=33055, Unknown=0, NotChecked=0, Total=48180 [2020-09-04 17:53:19,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 426 states. [2020-09-04 17:53:19,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 426 to 421. [2020-09-04 17:53:19,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 421 states. [2020-09-04 17:53:19,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 421 states to 421 states and 423 transitions. [2020-09-04 17:53:19,359 INFO L78 Accepts]: Start accepts. Automaton has 421 states and 423 transitions. Word has length 411 [2020-09-04 17:53:19,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:53:19,360 INFO L479 AbstractCegarLoop]: Abstraction has 421 states and 423 transitions. [2020-09-04 17:53:19,360 INFO L480 AbstractCegarLoop]: Interpolant automaton has 112 states. [2020-09-04 17:53:19,360 INFO L276 IsEmpty]: Start isEmpty. Operand 421 states and 423 transitions. [2020-09-04 17:53:19,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 419 [2020-09-04 17:53:19,361 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:53:19,362 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 55, 55, 55, 55, 55, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:53:19,362 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2020-09-04 17:53:19,362 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:53:19,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:53:19,362 INFO L82 PathProgramCache]: Analyzing trace with hash 948030581, now seen corresponding path program 54 times [2020-09-04 17:53:19,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:53:19,363 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1179431325] [2020-09-04 17:53:19,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:53:19,371 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:53:19,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:53:31,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:53:31,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:53:31,775 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 17:53:31,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1179431325] [2020-09-04 17:53:31,775 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:53:31,775 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [114] imperfect sequences [] total 114 [2020-09-04 17:53:31,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013574625] [2020-09-04 17:53:31,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 114 states [2020-09-04 17:53:31,776 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:53:31,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2020-09-04 17:53:31,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3250, Invalid=9632, Unknown=0, NotChecked=0, Total=12882 [2020-09-04 17:53:31,778 INFO L87 Difference]: Start difference. First operand 421 states and 423 transitions. Second operand 114 states. [2020-09-04 17:53:52,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:53:52,471 INFO L93 Difference]: Finished difference Result 458 states and 462 transitions. [2020-09-04 17:53:52,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 169 states. [2020-09-04 17:53:52,474 INFO L78 Accepts]: Start accepts. Automaton has 114 states. Word has length 418 [2020-09-04 17:53:52,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:53:52,476 INFO L225 Difference]: With dead ends: 458 [2020-09-04 17:53:52,476 INFO L226 Difference]: Without dead ends: 433 [2020-09-04 17:53:52,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9074 ImplicationChecksByTransitivity, 30.0s TimeCoverageRelationStatistics Valid=15680, Invalid=34272, Unknown=0, NotChecked=0, Total=49952 [2020-09-04 17:53:52,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2020-09-04 17:53:52,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 428. [2020-09-04 17:53:52,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 428 states. [2020-09-04 17:53:52,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 430 transitions. [2020-09-04 17:53:52,485 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 430 transitions. Word has length 418 [2020-09-04 17:53:52,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:53:52,485 INFO L479 AbstractCegarLoop]: Abstraction has 428 states and 430 transitions. [2020-09-04 17:53:52,485 INFO L480 AbstractCegarLoop]: Interpolant automaton has 114 states. [2020-09-04 17:53:52,485 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 430 transitions. [2020-09-04 17:53:52,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2020-09-04 17:53:52,487 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:53:52,487 INFO L422 BasicCegarLoop]: trace histogram [56, 56, 56, 56, 56, 56, 56, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:53:52,487 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2020-09-04 17:53:52,487 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:53:52,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:53:52,488 INFO L82 PathProgramCache]: Analyzing trace with hash 1281421188, now seen corresponding path program 55 times [2020-09-04 17:53:52,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:53:52,488 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1189013429] [2020-09-04 17:53:52,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:53:52,495 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:53:52,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:54:06,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:54:06,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:54:06,288 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 17:54:06,289 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1189013429] [2020-09-04 17:54:06,289 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:54:06,289 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [116] imperfect sequences [] total 116 [2020-09-04 17:54:06,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2037573311] [2020-09-04 17:54:06,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2020-09-04 17:54:06,290 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:54:06,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2020-09-04 17:54:06,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3365, Invalid=9975, Unknown=0, NotChecked=0, Total=13340 [2020-09-04 17:54:06,292 INFO L87 Difference]: Start difference. First operand 428 states and 430 transitions. Second operand 116 states. [2020-09-04 17:54:28,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:54:28,308 INFO L93 Difference]: Finished difference Result 465 states and 469 transitions. [2020-09-04 17:54:28,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 172 states. [2020-09-04 17:54:28,311 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 425 [2020-09-04 17:54:28,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:54:28,313 INFO L225 Difference]: With dead ends: 465 [2020-09-04 17:54:28,313 INFO L226 Difference]: Without dead ends: 440 [2020-09-04 17:54:28,315 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 226 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9407 ImplicationChecksByTransitivity, 33.5s TimeCoverageRelationStatistics Valid=16245, Invalid=35511, Unknown=0, NotChecked=0, Total=51756 [2020-09-04 17:54:28,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 440 states. [2020-09-04 17:54:28,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 440 to 435. [2020-09-04 17:54:28,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 435 states. [2020-09-04 17:54:28,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 437 transitions. [2020-09-04 17:54:28,322 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 437 transitions. Word has length 425 [2020-09-04 17:54:28,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:54:28,323 INFO L479 AbstractCegarLoop]: Abstraction has 435 states and 437 transitions. [2020-09-04 17:54:28,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 116 states. [2020-09-04 17:54:28,323 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 437 transitions. [2020-09-04 17:54:28,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 433 [2020-09-04 17:54:28,324 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:54:28,325 INFO L422 BasicCegarLoop]: trace histogram [57, 57, 57, 57, 57, 57, 57, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:54:28,325 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2020-09-04 17:54:28,325 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:54:28,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:54:28,325 INFO L82 PathProgramCache]: Analyzing trace with hash -822735467, now seen corresponding path program 56 times [2020-09-04 17:54:28,325 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:54:28,326 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1310823859] [2020-09-04 17:54:28,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:54:28,330 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:54:28,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:54:43,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:54:43,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:54:43,816 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 17:54:43,817 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1310823859] [2020-09-04 17:54:43,817 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:54:43,817 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [118] imperfect sequences [] total 118 [2020-09-04 17:54:43,817 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255807349] [2020-09-04 17:54:43,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 118 states [2020-09-04 17:54:43,818 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:54:43,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2020-09-04 17:54:43,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3482, Invalid=10324, Unknown=0, NotChecked=0, Total=13806 [2020-09-04 17:54:43,819 INFO L87 Difference]: Start difference. First operand 435 states and 437 transitions. Second operand 118 states. [2020-09-04 17:55:09,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:55:09,919 INFO L93 Difference]: Finished difference Result 472 states and 476 transitions. [2020-09-04 17:55:09,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 175 states. [2020-09-04 17:55:09,922 INFO L78 Accepts]: Start accepts. Automaton has 118 states. Word has length 432 [2020-09-04 17:55:09,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:55:09,924 INFO L225 Difference]: With dead ends: 472 [2020-09-04 17:55:09,925 INFO L226 Difference]: Without dead ends: 447 [2020-09-04 17:55:09,927 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 230 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9746 ImplicationChecksByTransitivity, 37.9s TimeCoverageRelationStatistics Valid=16820, Invalid=36772, Unknown=0, NotChecked=0, Total=53592 [2020-09-04 17:55:09,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 447 states. [2020-09-04 17:55:09,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 447 to 442. [2020-09-04 17:55:09,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 442 states. [2020-09-04 17:55:09,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 442 states to 442 states and 444 transitions. [2020-09-04 17:55:09,937 INFO L78 Accepts]: Start accepts. Automaton has 442 states and 444 transitions. Word has length 432 [2020-09-04 17:55:09,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:55:09,938 INFO L479 AbstractCegarLoop]: Abstraction has 442 states and 444 transitions. [2020-09-04 17:55:09,938 INFO L480 AbstractCegarLoop]: Interpolant automaton has 118 states. [2020-09-04 17:55:09,938 INFO L276 IsEmpty]: Start isEmpty. Operand 442 states and 444 transitions. [2020-09-04 17:55:09,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 440 [2020-09-04 17:55:09,941 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:55:09,942 INFO L422 BasicCegarLoop]: trace histogram [58, 58, 58, 58, 58, 58, 58, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:55:09,942 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2020-09-04 17:55:09,942 INFO L427 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:55:09,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:55:09,943 INFO L82 PathProgramCache]: Analyzing trace with hash 1945578084, now seen corresponding path program 57 times [2020-09-04 17:55:09,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:55:09,943 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2103540563] [2020-09-04 17:55:09,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:55:09,955 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:55:10,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:55:27,399 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:55:27,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:55:27,522 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 17:55:27,523 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2103540563] [2020-09-04 17:55:27,523 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:55:27,523 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [120] imperfect sequences [] total 120 [2020-09-04 17:55:27,523 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465912646] [2020-09-04 17:55:27,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 120 states [2020-09-04 17:55:27,524 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:55:27,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2020-09-04 17:55:27,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3601, Invalid=10679, Unknown=0, NotChecked=0, Total=14280 [2020-09-04 17:55:27,525 INFO L87 Difference]: Start difference. First operand 442 states and 444 transitions. Second operand 120 states. [2020-09-04 17:55:54,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:55:54,537 INFO L93 Difference]: Finished difference Result 479 states and 483 transitions. [2020-09-04 17:55:54,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 178 states. [2020-09-04 17:55:54,540 INFO L78 Accepts]: Start accepts. Automaton has 120 states. Word has length 439 [2020-09-04 17:55:54,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:55:54,543 INFO L225 Difference]: With dead ends: 479 [2020-09-04 17:55:54,543 INFO L226 Difference]: Without dead ends: 454 [2020-09-04 17:55:54,545 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 234 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10091 ImplicationChecksByTransitivity, 42.4s TimeCoverageRelationStatistics Valid=17405, Invalid=38055, Unknown=0, NotChecked=0, Total=55460 [2020-09-04 17:55:54,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2020-09-04 17:55:54,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 449. [2020-09-04 17:55:54,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 449 states. [2020-09-04 17:55:54,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 451 transitions. [2020-09-04 17:55:54,553 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 451 transitions. Word has length 439 [2020-09-04 17:55:54,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:55:54,553 INFO L479 AbstractCegarLoop]: Abstraction has 449 states and 451 transitions. [2020-09-04 17:55:54,553 INFO L480 AbstractCegarLoop]: Interpolant automaton has 120 states. [2020-09-04 17:55:54,553 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 451 transitions. [2020-09-04 17:55:54,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 447 [2020-09-04 17:55:54,555 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:55:54,556 INFO L422 BasicCegarLoop]: trace histogram [59, 59, 59, 59, 59, 59, 59, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:55:54,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2020-09-04 17:55:54,556 INFO L427 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:55:54,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:55:54,556 INFO L82 PathProgramCache]: Analyzing trace with hash -70134091, now seen corresponding path program 58 times [2020-09-04 17:55:54,556 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:55:54,557 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [974018518] [2020-09-04 17:55:54,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:55:54,563 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:55:54,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:56:14,189 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:56:14,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:56:14,315 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 17:56:14,315 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [974018518] [2020-09-04 17:56:14,315 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:56:14,316 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [122] imperfect sequences [] total 122 [2020-09-04 17:56:14,316 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489933565] [2020-09-04 17:56:14,316 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2020-09-04 17:56:14,316 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:56:14,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2020-09-04 17:56:14,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3722, Invalid=11040, Unknown=0, NotChecked=0, Total=14762 [2020-09-04 17:56:14,318 INFO L87 Difference]: Start difference. First operand 449 states and 451 transitions. Second operand 122 states. [2020-09-04 17:56:46,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:56:46,309 INFO L93 Difference]: Finished difference Result 486 states and 490 transitions. [2020-09-04 17:56:46,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 181 states. [2020-09-04 17:56:46,313 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 446 [2020-09-04 17:56:46,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:56:46,316 INFO L225 Difference]: With dead ends: 486 [2020-09-04 17:56:46,316 INFO L226 Difference]: Without dead ends: 461 [2020-09-04 17:56:46,318 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 238 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10442 ImplicationChecksByTransitivity, 47.5s TimeCoverageRelationStatistics Valid=18000, Invalid=39360, Unknown=0, NotChecked=0, Total=57360 [2020-09-04 17:56:46,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2020-09-04 17:56:46,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 456. [2020-09-04 17:56:46,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 456 states. [2020-09-04 17:56:46,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 458 transitions. [2020-09-04 17:56:46,326 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 458 transitions. Word has length 446 [2020-09-04 17:56:46,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:56:46,327 INFO L479 AbstractCegarLoop]: Abstraction has 456 states and 458 transitions. [2020-09-04 17:56:46,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 122 states. [2020-09-04 17:56:46,327 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 458 transitions. [2020-09-04 17:56:46,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 454 [2020-09-04 17:56:46,329 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:56:46,330 INFO L422 BasicCegarLoop]: trace histogram [60, 60, 60, 60, 60, 60, 60, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:56:46,330 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2020-09-04 17:56:46,330 INFO L427 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:56:46,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:56:46,330 INFO L82 PathProgramCache]: Analyzing trace with hash -216212156, now seen corresponding path program 59 times [2020-09-04 17:56:46,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:56:46,331 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2129499854] [2020-09-04 17:56:46,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:56:46,345 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:56:46,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:57:07,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:57:07,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:57:07,801 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 17:57:07,801 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2129499854] [2020-09-04 17:57:07,801 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:57:07,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [124] imperfect sequences [] total 124 [2020-09-04 17:57:07,802 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868287900] [2020-09-04 17:57:07,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 124 states [2020-09-04 17:57:07,803 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:57:07,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2020-09-04 17:57:07,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3845, Invalid=11407, Unknown=0, NotChecked=0, Total=15252 [2020-09-04 17:57:07,804 INFO L87 Difference]: Start difference. First operand 456 states and 458 transitions. Second operand 124 states. [2020-09-04 17:57:41,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:57:41,214 INFO L93 Difference]: Finished difference Result 493 states and 497 transitions. [2020-09-04 17:57:41,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 184 states. [2020-09-04 17:57:41,216 INFO L78 Accepts]: Start accepts. Automaton has 124 states. Word has length 453 [2020-09-04 17:57:41,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:57:41,219 INFO L225 Difference]: With dead ends: 493 [2020-09-04 17:57:41,219 INFO L226 Difference]: Without dead ends: 468 [2020-09-04 17:57:41,221 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 242 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10799 ImplicationChecksByTransitivity, 50.4s TimeCoverageRelationStatistics Valid=18605, Invalid=40687, Unknown=0, NotChecked=0, Total=59292 [2020-09-04 17:57:41,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 468 states. [2020-09-04 17:57:41,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 468 to 463. [2020-09-04 17:57:41,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 463 states. [2020-09-04 17:57:41,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 465 transitions. [2020-09-04 17:57:41,229 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 465 transitions. Word has length 453 [2020-09-04 17:57:41,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:57:41,229 INFO L479 AbstractCegarLoop]: Abstraction has 463 states and 465 transitions. [2020-09-04 17:57:41,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 124 states. [2020-09-04 17:57:41,229 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 465 transitions. [2020-09-04 17:57:41,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 461 [2020-09-04 17:57:41,231 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:57:41,232 INFO L422 BasicCegarLoop]: trace histogram [61, 61, 61, 61, 61, 61, 61, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:57:41,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63 [2020-09-04 17:57:41,232 INFO L427 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:57:41,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:57:41,232 INFO L82 PathProgramCache]: Analyzing trace with hash -1891162155, now seen corresponding path program 60 times [2020-09-04 17:57:41,233 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:57:41,233 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2106099423] [2020-09-04 17:57:41,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:57:41,243 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:57:41,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:58:02,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:58:02,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:58:02,598 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 17:58:02,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2106099423] [2020-09-04 17:58:02,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:58:02,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [126] imperfect sequences [] total 126 [2020-09-04 17:58:02,599 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105972701] [2020-09-04 17:58:02,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 126 states [2020-09-04 17:58:02,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:58:02,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2020-09-04 17:58:02,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3970, Invalid=11780, Unknown=0, NotChecked=0, Total=15750 [2020-09-04 17:58:02,601 INFO L87 Difference]: Start difference. First operand 463 states and 465 transitions. Second operand 126 states. [2020-09-04 17:58:31,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:58:31,386 INFO L93 Difference]: Finished difference Result 500 states and 504 transitions. [2020-09-04 17:58:31,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 187 states. [2020-09-04 17:58:31,389 INFO L78 Accepts]: Start accepts. Automaton has 126 states. Word has length 460 [2020-09-04 17:58:31,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:58:31,392 INFO L225 Difference]: With dead ends: 500 [2020-09-04 17:58:31,392 INFO L226 Difference]: Without dead ends: 475 [2020-09-04 17:58:31,394 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 246 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11162 ImplicationChecksByTransitivity, 46.5s TimeCoverageRelationStatistics Valid=19220, Invalid=42036, Unknown=0, NotChecked=0, Total=61256 [2020-09-04 17:58:31,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 475 states. [2020-09-04 17:58:31,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 475 to 470. [2020-09-04 17:58:31,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 470 states. [2020-09-04 17:58:31,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 472 transitions. [2020-09-04 17:58:31,401 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 472 transitions. Word has length 460 [2020-09-04 17:58:31,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:58:31,401 INFO L479 AbstractCegarLoop]: Abstraction has 470 states and 472 transitions. [2020-09-04 17:58:31,401 INFO L480 AbstractCegarLoop]: Interpolant automaton has 126 states. [2020-09-04 17:58:31,401 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 472 transitions. [2020-09-04 17:58:31,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-09-04 17:58:31,404 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:58:31,404 INFO L422 BasicCegarLoop]: trace histogram [62, 62, 62, 62, 62, 62, 62, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:58:31,404 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2020-09-04 17:58:31,404 INFO L427 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:58:31,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:58:31,404 INFO L82 PathProgramCache]: Analyzing trace with hash -1117779932, now seen corresponding path program 61 times [2020-09-04 17:58:31,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:58:31,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1435458164] [2020-09-04 17:58:31,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:58:31,411 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:58:31,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:58:48,106 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:58:48,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:58:48,240 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 17:58:48,240 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1435458164] [2020-09-04 17:58:48,241 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:58:48,241 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [128] imperfect sequences [] total 128 [2020-09-04 17:58:48,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981452454] [2020-09-04 17:58:48,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 128 states [2020-09-04 17:58:48,241 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:58:48,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2020-09-04 17:58:48,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4097, Invalid=12159, Unknown=0, NotChecked=0, Total=16256 [2020-09-04 17:58:48,243 INFO L87 Difference]: Start difference. First operand 470 states and 472 transitions. Second operand 128 states.