/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loops/string-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 23:01:21,828 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 23:01:21,830 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 23:01:21,857 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-22 23:01:21,867 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 23:01:21,868 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 23:01:21,870 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 23:01:21,871 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 23:01:21,872 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 23:01:21,873 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 23:01:21,875 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 23:01:21,877 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 23:01:21,879 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 23:01:21,880 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 23:01:21,881 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 23:01:21,882 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 23:01:21,885 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 23:01:21,898 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-08-22 23:01:21,915 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 23:01:21,915 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 23:01:21,917 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 23:01:21,917 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 23:01:21,918 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 23:01:21,918 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 23:01:21,918 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 23:01:21,918 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 23:01:21,918 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 23:01:21,919 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 23:01:21,919 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 23:01:21,919 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 23:01:21,920 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 23:01:21,920 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 23:01:21,920 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 23:01:21,920 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-08-22 23:01:21,921 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 23:01:21,921 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 23:01:21,921 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 23:01:21,921 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 23:01:21,921 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-08-22 23:01:21,922 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 23:01:21,924 INFO L138 SettingsManager]: * Use separate solver for trace checks=false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-08-22 23:01:22,224 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 23:01:22,237 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 23:01:22,241 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 23:01:22,243 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 23:01:22,244 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 23:01:22,245 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-1.i [2020-08-22 23:01:22,314 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c0b748422/fc7c7b81d88a4bc69b7f46b7a061ebfc/FLAG7b66732bc [2020-08-22 23:01:22,719 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 23:01:22,720 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/string-1.i [2020-08-22 23:01:22,728 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c0b748422/fc7c7b81d88a4bc69b7f46b7a061ebfc/FLAG7b66732bc [2020-08-22 23:01:23,098 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c0b748422/fc7c7b81d88a4bc69b7f46b7a061ebfc [2020-08-22 23:01:23,107 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 23:01:23,109 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 23:01:23,111 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 23:01:23,111 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 23:01:23,115 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 23:01:23,116 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 11:01:23" (1/1) ... [2020-08-22 23:01:23,120 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@146a98d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23, skipping insertion in model container [2020-08-22 23:01:23,120 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 11:01:23" (1/1) ... [2020-08-22 23:01:23,128 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 23:01:23,153 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 23:01:23,331 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 23:01:23,335 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 23:01:23,363 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 23:01:23,385 INFO L208 MainTranslator]: Completed translation [2020-08-22 23:01:23,385 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23 WrapperNode [2020-08-22 23:01:23,386 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 23:01:23,386 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 23:01:23,386 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 23:01:23,387 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 23:01:23,477 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23" (1/1) ... [2020-08-22 23:01:23,478 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23" (1/1) ... [2020-08-22 23:01:23,490 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23" (1/1) ... [2020-08-22 23:01:23,490 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23" (1/1) ... [2020-08-22 23:01:23,500 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23" (1/1) ... [2020-08-22 23:01:23,507 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23" (1/1) ... [2020-08-22 23:01:23,509 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23" (1/1) ... [2020-08-22 23:01:23,511 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 23:01:23,512 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 23:01:23,512 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 23:01:23,512 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 23:01:23,513 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 23:01:23,591 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 23:01:23,593 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 23:01:23,593 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-22 23:01:23,593 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 23:01:23,593 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 23:01:23,593 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 23:01:23,594 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 23:01:23,594 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-22 23:01:23,594 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 23:01:23,594 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-22 23:01:23,594 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 23:01:23,595 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-22 23:01:23,595 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-22 23:01:23,596 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-22 23:01:23,596 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-22 23:01:23,596 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 23:01:23,597 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 23:01:24,024 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 23:01:24,024 INFO L295 CfgBuilder]: Removed 5 assume(true) statements. [2020-08-22 23:01:24,030 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 11:01:24 BoogieIcfgContainer [2020-08-22 23:01:24,031 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 23:01:24,032 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 23:01:24,032 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 23:01:24,036 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 23:01:24,036 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 11:01:23" (1/3) ... [2020-08-22 23:01:24,038 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d678b54 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 11:01:24, skipping insertion in model container [2020-08-22 23:01:24,038 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23" (2/3) ... [2020-08-22 23:01:24,038 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d678b54 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 11:01:24, skipping insertion in model container [2020-08-22 23:01:24,038 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 11:01:24" (3/3) ... [2020-08-22 23:01:24,040 INFO L109 eAbstractionObserver]: Analyzing ICFG string-1.i [2020-08-22 23:01:24,053 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 23:01:24,061 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 23:01:24,076 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 23:01:24,099 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 23:01:24,099 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 23:01:24,099 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 23:01:24,099 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 23:01:24,099 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 23:01:24,100 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 23:01:24,100 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 23:01:24,100 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 23:01:24,119 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states. [2020-08-22 23:01:24,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-22 23:01:24,132 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:24,133 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:24,133 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:24,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:24,140 INFO L82 PathProgramCache]: Analyzing trace with hash -768807104, now seen corresponding path program 1 times [2020-08-22 23:01:24,149 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:24,150 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1179611399] [2020-08-22 23:01:24,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:24,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:24,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:24,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:24,376 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:01:24,377 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1179611399] [2020-08-22 23:01:24,379 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 23:01:24,380 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 23:01:24,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220589220] [2020-08-22 23:01:24,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 23:01:24,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:24,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 23:01:24,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 23:01:24,410 INFO L87 Difference]: Start difference. First operand 105 states. Second operand 3 states. [2020-08-22 23:01:24,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:24,955 INFO L93 Difference]: Finished difference Result 188 states and 215 transitions. [2020-08-22 23:01:24,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 23:01:24,957 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 37 [2020-08-22 23:01:24,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:24,971 INFO L225 Difference]: With dead ends: 188 [2020-08-22 23:01:24,972 INFO L226 Difference]: Without dead ends: 77 [2020-08-22 23:01:24,978 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 [2020-08-22 23:01:24,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-22 23:01:25,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2020-08-22 23:01:25,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-22 23:01:25,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 82 transitions. [2020-08-22 23:01:25,032 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 82 transitions. Word has length 37 [2020-08-22 23:01:25,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:25,033 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 82 transitions. [2020-08-22 23:01:25,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 23:01:25,034 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 82 transitions. [2020-08-22 23:01:25,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-22 23:01:25,036 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:25,036 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:25,037 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 23:01:25,037 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:25,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:25,038 INFO L82 PathProgramCache]: Analyzing trace with hash 1309055982, now seen corresponding path program 1 times [2020-08-22 23:01:25,038 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:25,039 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [424830627] [2020-08-22 23:01:25,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:25,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:25,139 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:25,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:25,151 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:01:25,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [424830627] [2020-08-22 23:01:25,152 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 23:01:25,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 23:01:25,153 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497626694] [2020-08-22 23:01:25,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 23:01:25,155 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:25,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 23:01:25,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 23:01:25,156 INFO L87 Difference]: Start difference. First operand 77 states and 82 transitions. Second operand 4 states. [2020-08-22 23:01:25,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:25,443 INFO L93 Difference]: Finished difference Result 144 states and 155 transitions. [2020-08-22 23:01:25,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 23:01:25,444 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 41 [2020-08-22 23:01:25,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:25,446 INFO L225 Difference]: With dead ends: 144 [2020-08-22 23:01:25,447 INFO L226 Difference]: Without dead ends: 89 [2020-08-22 23:01:25,448 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 [2020-08-22 23:01:25,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-22 23:01:25,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 79. [2020-08-22 23:01:25,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-22 23:01:25,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 84 transitions. [2020-08-22 23:01:25,462 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 84 transitions. Word has length 41 [2020-08-22 23:01:25,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:25,463 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 84 transitions. [2020-08-22 23:01:25,463 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 23:01:25,463 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 84 transitions. [2020-08-22 23:01:25,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-22 23:01:25,465 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:25,465 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:25,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 23:01:25,466 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:25,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:25,467 INFO L82 PathProgramCache]: Analyzing trace with hash 512896601, now seen corresponding path program 1 times [2020-08-22 23:01:25,467 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:25,467 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2119110771] [2020-08-22 23:01:25,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:25,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:25,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:25,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:25,591 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 23:01:25,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2119110771] [2020-08-22 23:01:25,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:25,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 23:01:25,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669807699] [2020-08-22 23:01:25,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 23:01:25,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:25,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 23:01:25,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-22 23:01:25,594 INFO L87 Difference]: Start difference. First operand 79 states and 84 transitions. Second operand 6 states. [2020-08-22 23:01:25,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:25,801 INFO L93 Difference]: Finished difference Result 152 states and 162 transitions. [2020-08-22 23:01:25,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 23:01:25,802 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 55 [2020-08-22 23:01:25,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:25,803 INFO L225 Difference]: With dead ends: 152 [2020-08-22 23:01:25,804 INFO L226 Difference]: Without dead ends: 96 [2020-08-22 23:01:25,805 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 [2020-08-22 23:01:25,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-22 23:01:25,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 86. [2020-08-22 23:01:25,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-22 23:01:25,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 91 transitions. [2020-08-22 23:01:25,818 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 91 transitions. Word has length 55 [2020-08-22 23:01:25,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:25,818 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 91 transitions. [2020-08-22 23:01:25,818 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 23:01:25,819 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 91 transitions. [2020-08-22 23:01:25,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-22 23:01:25,821 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:25,821 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:25,821 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 23:01:25,822 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:25,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:25,822 INFO L82 PathProgramCache]: Analyzing trace with hash 1958895614, now seen corresponding path program 2 times [2020-08-22 23:01:25,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:25,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1633857513] [2020-08-22 23:01:25,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:25,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:25,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:25,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:25,951 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-08-22 23:01:25,952 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1633857513] [2020-08-22 23:01:25,952 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:25,953 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 23:01:25,953 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497424343] [2020-08-22 23:01:25,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 23:01:25,954 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:25,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 23:01:25,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-22 23:01:25,956 INFO L87 Difference]: Start difference. First operand 86 states and 91 transitions. Second operand 6 states. [2020-08-22 23:01:26,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:26,153 INFO L93 Difference]: Finished difference Result 142 states and 151 transitions. [2020-08-22 23:01:26,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 23:01:26,154 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 62 [2020-08-22 23:01:26,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:26,156 INFO L225 Difference]: With dead ends: 142 [2020-08-22 23:01:26,156 INFO L226 Difference]: Without dead ends: 98 [2020-08-22 23:01:26,158 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 [2020-08-22 23:01:26,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-22 23:01:26,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 93. [2020-08-22 23:01:26,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-22 23:01:26,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 98 transitions. [2020-08-22 23:01:26,181 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 98 transitions. Word has length 62 [2020-08-22 23:01:26,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:26,182 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 98 transitions. [2020-08-22 23:01:26,182 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 23:01:26,182 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 98 transitions. [2020-08-22 23:01:26,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-22 23:01:26,192 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:26,192 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:26,193 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 23:01:26,195 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:26,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:26,196 INFO L82 PathProgramCache]: Analyzing trace with hash 11176526, now seen corresponding path program 3 times [2020-08-22 23:01:26,196 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:26,196 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1820625068] [2020-08-22 23:01:26,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:26,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:26,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:26,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:26,382 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-08-22 23:01:26,384 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1820625068] [2020-08-22 23:01:26,384 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:26,384 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 23:01:26,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983281574] [2020-08-22 23:01:26,387 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 23:01:26,387 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:26,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 23:01:26,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-22 23:01:26,389 INFO L87 Difference]: Start difference. First operand 93 states and 98 transitions. Second operand 8 states. [2020-08-22 23:01:26,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:26,667 INFO L93 Difference]: Finished difference Result 168 states and 178 transitions. [2020-08-22 23:01:26,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 23:01:26,668 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 69 [2020-08-22 23:01:26,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:26,669 INFO L225 Difference]: With dead ends: 168 [2020-08-22 23:01:26,670 INFO L226 Difference]: Without dead ends: 105 [2020-08-22 23:01:26,671 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2020-08-22 23:01:26,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-08-22 23:01:26,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 100. [2020-08-22 23:01:26,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-08-22 23:01:26,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 105 transitions. [2020-08-22 23:01:26,684 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 105 transitions. Word has length 69 [2020-08-22 23:01:26,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:26,685 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 105 transitions. [2020-08-22 23:01:26,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 23:01:26,685 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 105 transitions. [2020-08-22 23:01:26,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-22 23:01:26,686 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:26,686 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:26,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 23:01:26,692 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:26,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:26,693 INFO L82 PathProgramCache]: Analyzing trace with hash -1399032013, now seen corresponding path program 4 times [2020-08-22 23:01:26,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:26,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [965183696] [2020-08-22 23:01:26,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:26,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:26,876 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:26,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:26,887 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-08-22 23:01:26,888 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [965183696] [2020-08-22 23:01:26,889 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:26,890 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 23:01:26,891 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635091100] [2020-08-22 23:01:26,892 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 23:01:26,893 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:26,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 23:01:26,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-08-22 23:01:26,894 INFO L87 Difference]: Start difference. First operand 100 states and 105 transitions. Second operand 10 states. [2020-08-22 23:01:27,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:27,167 INFO L93 Difference]: Finished difference Result 175 states and 185 transitions. [2020-08-22 23:01:27,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 23:01:27,168 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 76 [2020-08-22 23:01:27,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:27,169 INFO L225 Difference]: With dead ends: 175 [2020-08-22 23:01:27,170 INFO L226 Difference]: Without dead ends: 112 [2020-08-22 23:01:27,171 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 [2020-08-22 23:01:27,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-22 23:01:27,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 107. [2020-08-22 23:01:27,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-22 23:01:27,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 112 transitions. [2020-08-22 23:01:27,184 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 112 transitions. Word has length 76 [2020-08-22 23:01:27,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:27,185 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 112 transitions. [2020-08-22 23:01:27,185 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 23:01:27,185 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 112 transitions. [2020-08-22 23:01:27,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-22 23:01:27,187 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:27,187 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:27,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 23:01:27,187 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:27,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:27,188 INFO L82 PathProgramCache]: Analyzing trace with hash 1633037998, now seen corresponding path program 5 times [2020-08-22 23:01:27,188 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:27,188 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2117171317] [2020-08-22 23:01:27,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:27,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:27,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:27,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:27,359 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-08-22 23:01:27,359 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2117171317] [2020-08-22 23:01:27,360 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:27,360 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 23:01:27,360 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239321311] [2020-08-22 23:01:27,361 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 23:01:27,361 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:27,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 23:01:27,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2020-08-22 23:01:27,362 INFO L87 Difference]: Start difference. First operand 107 states and 112 transitions. Second operand 12 states. [2020-08-22 23:01:27,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:27,677 INFO L93 Difference]: Finished difference Result 177 states and 187 transitions. [2020-08-22 23:01:27,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 23:01:27,678 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 83 [2020-08-22 23:01:27,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:27,679 INFO L225 Difference]: With dead ends: 177 [2020-08-22 23:01:27,679 INFO L226 Difference]: Without dead ends: 114 [2020-08-22 23:01:27,680 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 [2020-08-22 23:01:27,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-08-22 23:01:27,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2020-08-22 23:01:27,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2020-08-22 23:01:27,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 119 transitions. [2020-08-22 23:01:27,691 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 119 transitions. Word has length 83 [2020-08-22 23:01:27,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:27,692 INFO L479 AbstractCegarLoop]: Abstraction has 114 states and 119 transitions. [2020-08-22 23:01:27,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 23:01:27,692 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 119 transitions. [2020-08-22 23:01:27,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-22 23:01:27,694 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:27,694 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:27,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 23:01:27,694 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:27,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:27,695 INFO L82 PathProgramCache]: Analyzing trace with hash 2059478739, now seen corresponding path program 6 times [2020-08-22 23:01:27,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:27,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [744188142] [2020-08-22 23:01:27,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:27,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:27,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:27,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:27,801 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2020-08-22 23:01:27,801 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [744188142] [2020-08-22 23:01:27,802 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:27,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 23:01:27,802 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069734198] [2020-08-22 23:01:27,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 23:01:27,803 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:27,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 23:01:27,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-22 23:01:27,804 INFO L87 Difference]: Start difference. First operand 114 states and 119 transitions. Second operand 8 states. [2020-08-22 23:01:28,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:28,016 INFO L93 Difference]: Finished difference Result 170 states and 179 transitions. [2020-08-22 23:01:28,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 23:01:28,017 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 90 [2020-08-22 23:01:28,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:28,019 INFO L225 Difference]: With dead ends: 170 [2020-08-22 23:01:28,019 INFO L226 Difference]: Without dead ends: 126 [2020-08-22 23:01:28,019 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 [2020-08-22 23:01:28,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-08-22 23:01:28,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 121. [2020-08-22 23:01:28,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-22 23:01:28,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 126 transitions. [2020-08-22 23:01:28,030 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 126 transitions. Word has length 90 [2020-08-22 23:01:28,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:28,030 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 126 transitions. [2020-08-22 23:01:28,030 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 23:01:28,031 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 126 transitions. [2020-08-22 23:01:28,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-08-22 23:01:28,032 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:28,032 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:28,032 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 23:01:28,032 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:28,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:28,033 INFO L82 PathProgramCache]: Analyzing trace with hash 2012961241, now seen corresponding path program 7 times [2020-08-22 23:01:28,033 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:28,034 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [861717942] [2020-08-22 23:01:28,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:28,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:28,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:28,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:28,146 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2020-08-22 23:01:28,147 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [861717942] [2020-08-22 23:01:28,147 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:28,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 23:01:28,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755345882] [2020-08-22 23:01:28,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 23:01:28,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:28,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 23:01:28,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-08-22 23:01:28,149 INFO L87 Difference]: Start difference. First operand 121 states and 126 transitions. Second operand 10 states. [2020-08-22 23:01:28,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:28,435 INFO L93 Difference]: Finished difference Result 177 states and 186 transitions. [2020-08-22 23:01:28,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 23:01:28,436 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 97 [2020-08-22 23:01:28,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:28,437 INFO L225 Difference]: With dead ends: 177 [2020-08-22 23:01:28,438 INFO L226 Difference]: Without dead ends: 133 [2020-08-22 23:01:28,439 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 [2020-08-22 23:01:28,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-08-22 23:01:28,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 128. [2020-08-22 23:01:28,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2020-08-22 23:01:28,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 133 transitions. [2020-08-22 23:01:28,454 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 133 transitions. Word has length 97 [2020-08-22 23:01:28,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:28,457 INFO L479 AbstractCegarLoop]: Abstraction has 128 states and 133 transitions. [2020-08-22 23:01:28,457 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 23:01:28,461 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 133 transitions. [2020-08-22 23:01:28,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-22 23:01:28,463 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:28,463 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:28,463 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 23:01:28,463 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:28,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:28,469 INFO L82 PathProgramCache]: Analyzing trace with hash 1354290195, now seen corresponding path program 8 times [2020-08-22 23:01:28,470 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:28,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [568897196] [2020-08-22 23:01:28,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:28,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:28,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:28,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:28,635 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2020-08-22 23:01:28,636 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [568897196] [2020-08-22 23:01:28,636 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:28,636 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 23:01:28,636 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886949352] [2020-08-22 23:01:28,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 23:01:28,638 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:28,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 23:01:28,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2020-08-22 23:01:28,638 INFO L87 Difference]: Start difference. First operand 128 states and 133 transitions. Second operand 12 states. [2020-08-22 23:01:28,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:28,901 INFO L93 Difference]: Finished difference Result 179 states and 188 transitions. [2020-08-22 23:01:28,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 23:01:28,901 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 104 [2020-08-22 23:01:28,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:28,904 INFO L225 Difference]: With dead ends: 179 [2020-08-22 23:01:28,904 INFO L226 Difference]: Without dead ends: 135 [2020-08-22 23:01:28,905 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 [2020-08-22 23:01:28,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2020-08-22 23:01:28,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2020-08-22 23:01:28,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2020-08-22 23:01:28,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 140 transitions. [2020-08-22 23:01:28,916 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 140 transitions. Word has length 104 [2020-08-22 23:01:28,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:28,917 INFO L479 AbstractCegarLoop]: Abstraction has 135 states and 140 transitions. [2020-08-22 23:01:28,917 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 23:01:28,917 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 140 transitions. [2020-08-22 23:01:28,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-08-22 23:01:28,918 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:28,918 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:28,919 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 23:01:28,919 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:28,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:28,919 INFO L82 PathProgramCache]: Analyzing trace with hash 1908556953, now seen corresponding path program 9 times [2020-08-22 23:01:28,919 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:28,920 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1604026294] [2020-08-22 23:01:28,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:28,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:29,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:29,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:29,048 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2020-08-22 23:01:29,048 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1604026294] [2020-08-22 23:01:29,049 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 23:01:29,049 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-08-22 23:01:29,049 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618335304] [2020-08-22 23:01:29,050 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 23:01:29,050 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:29,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 23:01:29,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-22 23:01:29,051 INFO L87 Difference]: Start difference. First operand 135 states and 140 transitions. Second operand 8 states. [2020-08-22 23:01:29,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:29,320 INFO L93 Difference]: Finished difference Result 171 states and 179 transitions. [2020-08-22 23:01:29,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 23:01:29,321 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 111 [2020-08-22 23:01:29,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:29,323 INFO L225 Difference]: With dead ends: 171 [2020-08-22 23:01:29,324 INFO L226 Difference]: Without dead ends: 140 [2020-08-22 23:01:29,325 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2020-08-22 23:01:29,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2020-08-22 23:01:29,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 137. [2020-08-22 23:01:29,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2020-08-22 23:01:29,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 142 transitions. [2020-08-22 23:01:29,337 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 142 transitions. Word has length 111 [2020-08-22 23:01:29,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:29,338 INFO L479 AbstractCegarLoop]: Abstraction has 137 states and 142 transitions. [2020-08-22 23:01:29,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 23:01:29,338 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 142 transitions. [2020-08-22 23:01:29,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-08-22 23:01:29,340 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:29,341 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:29,341 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 23:01:29,341 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:29,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:29,342 INFO L82 PathProgramCache]: Analyzing trace with hash 358773697, now seen corresponding path program 1 times [2020-08-22 23:01:29,342 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:29,342 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2008872842] [2020-08-22 23:01:29,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:29,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:29,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:29,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:29,546 INFO L134 CoverageAnalysis]: Checked inductivity of 152 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2020-08-22 23:01:29,547 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2008872842] [2020-08-22 23:01:29,547 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:29,547 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 23:01:29,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904982679] [2020-08-22 23:01:29,548 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 23:01:29,548 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:29,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 23:01:29,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-22 23:01:29,549 INFO L87 Difference]: Start difference. First operand 137 states and 142 transitions. Second operand 10 states. [2020-08-22 23:01:29,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:29,903 INFO L93 Difference]: Finished difference Result 189 states and 198 transitions. [2020-08-22 23:01:29,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 23:01:29,904 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 117 [2020-08-22 23:01:29,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:29,908 INFO L225 Difference]: With dead ends: 189 [2020-08-22 23:01:29,908 INFO L226 Difference]: Without dead ends: 183 [2020-08-22 23:01:29,909 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2020-08-22 23:01:29,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2020-08-22 23:01:29,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 164. [2020-08-22 23:01:29,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2020-08-22 23:01:29,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 172 transitions. [2020-08-22 23:01:29,927 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 172 transitions. Word has length 117 [2020-08-22 23:01:29,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:29,928 INFO L479 AbstractCegarLoop]: Abstraction has 164 states and 172 transitions. [2020-08-22 23:01:29,928 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 23:01:29,929 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 172 transitions. [2020-08-22 23:01:29,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-08-22 23:01:29,931 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:29,932 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:29,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-22 23:01:29,932 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:29,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:29,933 INFO L82 PathProgramCache]: Analyzing trace with hash 165455081, now seen corresponding path program 2 times [2020-08-22 23:01:29,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:29,933 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [226650079] [2020-08-22 23:01:29,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:29,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:30,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:30,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:30,123 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2020-08-22 23:01:30,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [226650079] [2020-08-22 23:01:30,123 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:30,124 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 23:01:30,124 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356969293] [2020-08-22 23:01:30,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 23:01:30,125 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:30,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 23:01:30,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2020-08-22 23:01:30,125 INFO L87 Difference]: Start difference. First operand 164 states and 172 transitions. Second operand 12 states. [2020-08-22 23:01:30,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:30,497 INFO L93 Difference]: Finished difference Result 190 states and 199 transitions. [2020-08-22 23:01:30,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 23:01:30,497 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 123 [2020-08-22 23:01:30,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:30,499 INFO L225 Difference]: With dead ends: 190 [2020-08-22 23:01:30,499 INFO L226 Difference]: Without dead ends: 184 [2020-08-22 23:01:30,500 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=83, Invalid=379, Unknown=0, NotChecked=0, Total=462 [2020-08-22 23:01:30,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2020-08-22 23:01:30,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 138. [2020-08-22 23:01:30,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2020-08-22 23:01:30,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 143 transitions. [2020-08-22 23:01:30,514 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 143 transitions. Word has length 123 [2020-08-22 23:01:30,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:30,514 INFO L479 AbstractCegarLoop]: Abstraction has 138 states and 143 transitions. [2020-08-22 23:01:30,514 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 23:01:30,514 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 143 transitions. [2020-08-22 23:01:30,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-08-22 23:01:30,516 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:30,516 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:30,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-22 23:01:30,516 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:30,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:30,517 INFO L82 PathProgramCache]: Analyzing trace with hash -647047863, now seen corresponding path program 1 times [2020-08-22 23:01:30,517 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:30,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [263034759] [2020-08-22 23:01:30,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:30,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:30,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:30,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:30,607 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 152 trivial. 0 not checked. [2020-08-22 23:01:30,608 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [263034759] [2020-08-22 23:01:30,608 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 23:01:30,608 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-22 23:01:30,608 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487265336] [2020-08-22 23:01:30,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 23:01:30,609 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:30,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 23:01:30,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 23:01:30,610 INFO L87 Difference]: Start difference. First operand 138 states and 143 transitions. Second operand 6 states. [2020-08-22 23:01:30,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:30,738 INFO L93 Difference]: Finished difference Result 181 states and 189 transitions. [2020-08-22 23:01:30,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 23:01:30,739 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 129 [2020-08-22 23:01:30,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:30,740 INFO L225 Difference]: With dead ends: 181 [2020-08-22 23:01:30,740 INFO L226 Difference]: Without dead ends: 143 [2020-08-22 23:01:30,741 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-08-22 23:01:30,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2020-08-22 23:01:30,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 140. [2020-08-22 23:01:30,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-08-22 23:01:30,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 145 transitions. [2020-08-22 23:01:30,755 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 145 transitions. Word has length 129 [2020-08-22 23:01:30,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:30,756 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 145 transitions. [2020-08-22 23:01:30,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 23:01:30,756 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 145 transitions. [2020-08-22 23:01:30,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-08-22 23:01:30,759 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:30,759 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:30,759 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-22 23:01:30,760 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:30,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:30,760 INFO L82 PathProgramCache]: Analyzing trace with hash -1209819887, now seen corresponding path program 1 times [2020-08-22 23:01:30,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:30,761 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [997795124] [2020-08-22 23:01:30,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:30,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:30,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:30,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:30,989 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 152 trivial. 0 not checked. [2020-08-22 23:01:30,990 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [997795124] [2020-08-22 23:01:30,990 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:30,990 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 23:01:30,991 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907407219] [2020-08-22 23:01:30,991 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 23:01:30,991 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:30,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 23:01:30,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2020-08-22 23:01:30,992 INFO L87 Difference]: Start difference. First operand 140 states and 145 transitions. Second operand 12 states. [2020-08-22 23:01:31,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:31,334 INFO L93 Difference]: Finished difference Result 197 states and 206 transitions. [2020-08-22 23:01:31,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 23:01:31,335 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 135 [2020-08-22 23:01:31,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:31,337 INFO L225 Difference]: With dead ends: 197 [2020-08-22 23:01:31,337 INFO L226 Difference]: Without dead ends: 149 [2020-08-22 23:01:31,338 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2020-08-22 23:01:31,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2020-08-22 23:01:31,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 146. [2020-08-22 23:01:31,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2020-08-22 23:01:31,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 151 transitions. [2020-08-22 23:01:31,353 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 151 transitions. Word has length 135 [2020-08-22 23:01:31,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:31,353 INFO L479 AbstractCegarLoop]: Abstraction has 146 states and 151 transitions. [2020-08-22 23:01:31,353 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 23:01:31,353 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 151 transitions. [2020-08-22 23:01:31,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2020-08-22 23:01:31,355 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:31,356 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:31,356 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-22 23:01:31,356 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:31,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:31,357 INFO L82 PathProgramCache]: Analyzing trace with hash -1023255495, now seen corresponding path program 2 times [2020-08-22 23:01:31,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:31,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [273638224] [2020-08-22 23:01:31,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:31,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:31,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:31,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:31,565 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 152 trivial. 0 not checked. [2020-08-22 23:01:31,565 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [273638224] [2020-08-22 23:01:31,568 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:31,569 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-22 23:01:31,569 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [856215341] [2020-08-22 23:01:31,570 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-22 23:01:31,570 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:31,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-22 23:01:31,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2020-08-22 23:01:31,571 INFO L87 Difference]: Start difference. First operand 146 states and 151 transitions. Second operand 14 states. [2020-08-22 23:01:32,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:32,066 INFO L93 Difference]: Finished difference Result 171 states and 177 transitions. [2020-08-22 23:01:32,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 23:01:32,066 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 141 [2020-08-22 23:01:32,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:32,068 INFO L225 Difference]: With dead ends: 171 [2020-08-22 23:01:32,068 INFO L226 Difference]: Without dead ends: 165 [2020-08-22 23:01:32,069 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=579, Unknown=0, NotChecked=0, Total=702 [2020-08-22 23:01:32,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2020-08-22 23:01:32,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 158. [2020-08-22 23:01:32,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2020-08-22 23:01:32,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 164 transitions. [2020-08-22 23:01:32,085 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 164 transitions. Word has length 141 [2020-08-22 23:01:32,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:32,086 INFO L479 AbstractCegarLoop]: Abstraction has 158 states and 164 transitions. [2020-08-22 23:01:32,086 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-22 23:01:32,086 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 164 transitions. [2020-08-22 23:01:32,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2020-08-22 23:01:32,088 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:32,088 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:32,088 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-22 23:01:32,089 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:32,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:32,089 INFO L82 PathProgramCache]: Analyzing trace with hash -1679963711, now seen corresponding path program 3 times [2020-08-22 23:01:32,089 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:32,090 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1102331627] [2020-08-22 23:01:32,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:32,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:32,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:32,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:32,255 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 160 trivial. 0 not checked. [2020-08-22 23:01:32,256 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1102331627] [2020-08-22 23:01:32,256 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:32,256 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 23:01:32,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242016515] [2020-08-22 23:01:32,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 23:01:32,258 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:32,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 23:01:32,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-08-22 23:01:32,260 INFO L87 Difference]: Start difference. First operand 158 states and 164 transitions. Second operand 10 states. [2020-08-22 23:01:32,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:32,519 INFO L93 Difference]: Finished difference Result 240 states and 251 transitions. [2020-08-22 23:01:32,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 23:01:32,519 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 153 [2020-08-22 23:01:32,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:32,521 INFO L225 Difference]: With dead ends: 240 [2020-08-22 23:01:32,521 INFO L226 Difference]: Without dead ends: 167 [2020-08-22 23:01:32,522 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-08-22 23:01:32,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2020-08-22 23:01:32,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 164. [2020-08-22 23:01:32,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2020-08-22 23:01:32,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 170 transitions. [2020-08-22 23:01:32,537 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 170 transitions. Word has length 153 [2020-08-22 23:01:32,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:32,537 INFO L479 AbstractCegarLoop]: Abstraction has 164 states and 170 transitions. [2020-08-22 23:01:32,537 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 23:01:32,538 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 170 transitions. [2020-08-22 23:01:32,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2020-08-22 23:01:32,539 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:32,540 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:32,540 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-22 23:01:32,540 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:32,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:32,541 INFO L82 PathProgramCache]: Analyzing trace with hash 803846537, now seen corresponding path program 4 times [2020-08-22 23:01:32,541 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:32,541 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1899488072] [2020-08-22 23:01:32,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:32,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:32,749 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:32,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:32,771 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 2 proven. 22 refuted. 0 times theorem prover too weak. 160 trivial. 0 not checked. [2020-08-22 23:01:32,771 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1899488072] [2020-08-22 23:01:32,772 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:32,772 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-22 23:01:32,772 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517423610] [2020-08-22 23:01:32,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-22 23:01:32,773 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:32,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-22 23:01:32,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2020-08-22 23:01:32,774 INFO L87 Difference]: Start difference. First operand 164 states and 170 transitions. Second operand 16 states. [2020-08-22 23:01:33,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:33,272 INFO L93 Difference]: Finished difference Result 249 states and 261 transitions. [2020-08-22 23:01:33,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-22 23:01:33,273 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 159 [2020-08-22 23:01:33,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:33,274 INFO L225 Difference]: With dead ends: 249 [2020-08-22 23:01:33,274 INFO L226 Difference]: Without dead ends: 173 [2020-08-22 23:01:33,276 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=118, Invalid=694, Unknown=0, NotChecked=0, Total=812 [2020-08-22 23:01:33,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2020-08-22 23:01:33,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 170. [2020-08-22 23:01:33,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2020-08-22 23:01:33,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 176 transitions. [2020-08-22 23:01:33,294 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 176 transitions. Word has length 159 [2020-08-22 23:01:33,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:33,295 INFO L479 AbstractCegarLoop]: Abstraction has 170 states and 176 transitions. [2020-08-22 23:01:33,295 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-22 23:01:33,295 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 176 transitions. [2020-08-22 23:01:33,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2020-08-22 23:01:33,297 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:33,297 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:33,298 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-22 23:01:33,298 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:33,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:33,298 INFO L82 PathProgramCache]: Analyzing trace with hash 33884337, now seen corresponding path program 5 times [2020-08-22 23:01:33,300 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:33,301 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1646896312] [2020-08-22 23:01:33,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:33,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:33,525 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:33,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:33,549 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 12 proven. 26 refuted. 0 times theorem prover too weak. 160 trivial. 0 not checked. [2020-08-22 23:01:33,549 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1646896312] [2020-08-22 23:01:33,550 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:33,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-22 23:01:33,551 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762170400] [2020-08-22 23:01:33,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-22 23:01:33,552 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:33,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-22 23:01:33,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-22 23:01:33,553 INFO L87 Difference]: Start difference. First operand 170 states and 176 transitions. Second operand 18 states. [2020-08-22 23:01:34,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:34,180 INFO L93 Difference]: Finished difference Result 199 states and 206 transitions. [2020-08-22 23:01:34,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-22 23:01:34,180 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 165 [2020-08-22 23:01:34,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:34,184 INFO L225 Difference]: With dead ends: 199 [2020-08-22 23:01:34,184 INFO L226 Difference]: Without dead ends: 193 [2020-08-22 23:01:34,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=231, Invalid=1101, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 23:01:34,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2020-08-22 23:01:34,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 182. [2020-08-22 23:01:34,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2020-08-22 23:01:34,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 189 transitions. [2020-08-22 23:01:34,207 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 189 transitions. Word has length 165 [2020-08-22 23:01:34,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:34,207 INFO L479 AbstractCegarLoop]: Abstraction has 182 states and 189 transitions. [2020-08-22 23:01:34,207 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-22 23:01:34,207 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 189 transitions. [2020-08-22 23:01:34,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-08-22 23:01:34,209 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:34,210 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:34,210 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-22 23:01:34,210 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:34,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:34,210 INFO L82 PathProgramCache]: Analyzing trace with hash 1034519097, now seen corresponding path program 6 times [2020-08-22 23:01:34,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:34,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [525197877] [2020-08-22 23:01:34,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:34,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:34,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:34,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:34,423 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 30 proven. 19 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-08-22 23:01:34,423 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [525197877] [2020-08-22 23:01:34,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:34,424 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-22 23:01:34,424 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805162438] [2020-08-22 23:01:34,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-22 23:01:34,425 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:34,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-22 23:01:34,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2020-08-22 23:01:34,425 INFO L87 Difference]: Start difference. First operand 182 states and 189 transitions. Second operand 14 states. [2020-08-22 23:01:34,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:34,949 INFO L93 Difference]: Finished difference Result 361 states and 380 transitions. [2020-08-22 23:01:34,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 23:01:34,950 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 177 [2020-08-22 23:01:34,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:34,953 INFO L225 Difference]: With dead ends: 361 [2020-08-22 23:01:34,953 INFO L226 Difference]: Without dead ends: 283 [2020-08-22 23:01:34,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=144, Invalid=668, Unknown=0, NotChecked=0, Total=812 [2020-08-22 23:01:34,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2020-08-22 23:01:34,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 230. [2020-08-22 23:01:34,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 230 states. [2020-08-22 23:01:34,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 239 transitions. [2020-08-22 23:01:34,977 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 239 transitions. Word has length 177 [2020-08-22 23:01:34,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:34,977 INFO L479 AbstractCegarLoop]: Abstraction has 230 states and 239 transitions. [2020-08-22 23:01:34,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-22 23:01:34,978 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 239 transitions. [2020-08-22 23:01:34,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2020-08-22 23:01:34,981 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:34,981 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:34,981 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-22 23:01:34,981 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:34,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:34,982 INFO L82 PathProgramCache]: Analyzing trace with hash 2119473665, now seen corresponding path program 7 times [2020-08-22 23:01:34,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:34,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1652838955] [2020-08-22 23:01:34,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:35,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:35,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:35,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:35,337 INFO L134 CoverageAnalysis]: Checked inductivity of 237 backedges. 16 proven. 47 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-08-22 23:01:35,339 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1652838955] [2020-08-22 23:01:35,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:35,339 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-22 23:01:35,340 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738690484] [2020-08-22 23:01:35,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-22 23:01:35,342 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:35,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-22 23:01:35,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2020-08-22 23:01:35,343 INFO L87 Difference]: Start difference. First operand 230 states and 239 transitions. Second operand 20 states. [2020-08-22 23:01:36,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:36,057 INFO L93 Difference]: Finished difference Result 372 states and 390 transitions. [2020-08-22 23:01:36,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-22 23:01:36,058 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 183 [2020-08-22 23:01:36,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:36,060 INFO L225 Difference]: With dead ends: 372 [2020-08-22 23:01:36,060 INFO L226 Difference]: Without dead ends: 248 [2020-08-22 23:01:36,062 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 268 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=195, Invalid=1211, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 23:01:36,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2020-08-22 23:01:36,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 242. [2020-08-22 23:01:36,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2020-08-22 23:01:36,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 251 transitions. [2020-08-22 23:01:36,082 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 251 transitions. Word has length 183 [2020-08-22 23:01:36,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:36,083 INFO L479 AbstractCegarLoop]: Abstraction has 242 states and 251 transitions. [2020-08-22 23:01:36,083 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-22 23:01:36,083 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 251 transitions. [2020-08-22 23:01:36,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-08-22 23:01:36,085 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:36,086 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:36,086 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-22 23:01:36,088 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:36,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:36,089 INFO L82 PathProgramCache]: Analyzing trace with hash 1835694377, now seen corresponding path program 8 times [2020-08-22 23:01:36,089 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:36,089 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [168771171] [2020-08-22 23:01:36,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:36,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:36,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:36,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:36,393 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 27 proven. 56 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-08-22 23:01:36,395 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [168771171] [2020-08-22 23:01:36,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:36,395 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-22 23:01:36,395 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462674951] [2020-08-22 23:01:36,396 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-22 23:01:36,396 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:36,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-22 23:01:36,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=395, Unknown=0, NotChecked=0, Total=462 [2020-08-22 23:01:36,397 INFO L87 Difference]: Start difference. First operand 242 states and 251 transitions. Second operand 22 states. [2020-08-22 23:01:37,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:37,212 INFO L93 Difference]: Finished difference Result 278 states and 288 transitions. [2020-08-22 23:01:37,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-22 23:01:37,215 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 189 [2020-08-22 23:01:37,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:37,218 INFO L225 Difference]: With dead ends: 278 [2020-08-22 23:01:37,219 INFO L226 Difference]: Without dead ends: 272 [2020-08-22 23:01:37,221 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=379, Invalid=1783, Unknown=0, NotChecked=0, Total=2162 [2020-08-22 23:01:37,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2020-08-22 23:01:37,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 254. [2020-08-22 23:01:37,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-08-22 23:01:37,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 264 transitions. [2020-08-22 23:01:37,253 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 264 transitions. Word has length 189 [2020-08-22 23:01:37,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:37,253 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 264 transitions. [2020-08-22 23:01:37,254 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-22 23:01:37,254 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 264 transitions. [2020-08-22 23:01:37,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-08-22 23:01:37,259 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:37,259 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:37,259 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-22 23:01:37,259 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:37,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:37,260 INFO L82 PathProgramCache]: Analyzing trace with hash -640549199, now seen corresponding path program 9 times [2020-08-22 23:01:37,260 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:37,262 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [241044995] [2020-08-22 23:01:37,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:37,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:37,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:37,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:37,578 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 59 proven. 41 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2020-08-22 23:01:37,583 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [241044995] [2020-08-22 23:01:37,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:37,584 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-22 23:01:37,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659524435] [2020-08-22 23:01:37,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-22 23:01:37,589 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:37,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-22 23:01:37,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-22 23:01:37,590 INFO L87 Difference]: Start difference. First operand 254 states and 264 transitions. Second operand 18 states. [2020-08-22 23:01:38,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:38,541 INFO L93 Difference]: Finished difference Result 569 states and 601 transitions. [2020-08-22 23:01:38,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-22 23:01:38,542 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 201 [2020-08-22 23:01:38,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:38,545 INFO L225 Difference]: With dead ends: 569 [2020-08-22 23:01:38,546 INFO L226 Difference]: Without dead ends: 470 [2020-08-22 23:01:38,548 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 490 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=346, Invalid=1816, Unknown=0, NotChecked=0, Total=2162 [2020-08-22 23:01:38,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2020-08-22 23:01:38,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 312. [2020-08-22 23:01:38,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 312 states. [2020-08-22 23:01:38,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 326 transitions. [2020-08-22 23:01:38,580 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 326 transitions. Word has length 201 [2020-08-22 23:01:38,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:38,580 INFO L479 AbstractCegarLoop]: Abstraction has 312 states and 326 transitions. [2020-08-22 23:01:38,580 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-22 23:01:38,580 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 326 transitions. [2020-08-22 23:01:38,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2020-08-22 23:01:38,584 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:38,584 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:38,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-22 23:01:38,584 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:38,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:38,585 INFO L82 PathProgramCache]: Analyzing trace with hash 639909497, now seen corresponding path program 10 times [2020-08-22 23:01:38,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:38,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1380513809] [2020-08-22 23:01:38,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:38,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:38,876 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:38,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:38,909 INFO L134 CoverageAnalysis]: Checked inductivity of 314 backedges. 42 proven. 78 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2020-08-22 23:01:38,910 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1380513809] [2020-08-22 23:01:38,910 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:38,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-22 23:01:38,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558055246] [2020-08-22 23:01:38,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-22 23:01:38,911 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:38,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-22 23:01:38,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=480, Unknown=0, NotChecked=0, Total=552 [2020-08-22 23:01:38,912 INFO L87 Difference]: Start difference. First operand 312 states and 326 transitions. Second operand 24 states. [2020-08-22 23:01:39,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:39,871 INFO L93 Difference]: Finished difference Result 527 states and 555 transitions. [2020-08-22 23:01:39,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-22 23:01:39,871 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 207 [2020-08-22 23:01:39,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:39,876 INFO L225 Difference]: With dead ends: 527 [2020-08-22 23:01:39,876 INFO L226 Difference]: Without dead ends: 339 [2020-08-22 23:01:39,877 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=296, Invalid=1866, Unknown=0, NotChecked=0, Total=2162 [2020-08-22 23:01:39,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2020-08-22 23:01:39,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 330. [2020-08-22 23:01:39,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 330 states. [2020-08-22 23:01:39,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 344 transitions. [2020-08-22 23:01:39,905 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 344 transitions. Word has length 207 [2020-08-22 23:01:39,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:39,906 INFO L479 AbstractCegarLoop]: Abstraction has 330 states and 344 transitions. [2020-08-22 23:01:39,906 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-22 23:01:39,906 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 344 transitions. [2020-08-22 23:01:39,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2020-08-22 23:01:39,909 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:39,909 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:39,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-22 23:01:39,909 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:39,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:39,910 INFO L82 PathProgramCache]: Analyzing trace with hash -558715487, now seen corresponding path program 11 times [2020-08-22 23:01:39,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:39,910 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2008693123] [2020-08-22 23:01:39,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:39,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:40,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:40,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:40,274 INFO L134 CoverageAnalysis]: Checked inductivity of 340 backedges. 48 proven. 98 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2020-08-22 23:01:40,274 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2008693123] [2020-08-22 23:01:40,274 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:40,275 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-22 23:01:40,275 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844480196] [2020-08-22 23:01:40,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-22 23:01:40,278 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:40,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-22 23:01:40,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=559, Unknown=0, NotChecked=0, Total=650 [2020-08-22 23:01:40,279 INFO L87 Difference]: Start difference. First operand 330 states and 344 transitions. Second operand 26 states. [2020-08-22 23:01:41,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:41,314 INFO L93 Difference]: Finished difference Result 385 states and 400 transitions. [2020-08-22 23:01:41,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-22 23:01:41,315 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 213 [2020-08-22 23:01:41,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:41,317 INFO L225 Difference]: With dead ends: 385 [2020-08-22 23:01:41,318 INFO L226 Difference]: Without dead ends: 379 [2020-08-22 23:01:41,319 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 656 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=567, Invalid=2625, Unknown=0, NotChecked=0, Total=3192 [2020-08-22 23:01:41,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2020-08-22 23:01:41,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 342. [2020-08-22 23:01:41,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 342 states. [2020-08-22 23:01:41,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 357 transitions. [2020-08-22 23:01:41,347 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 357 transitions. Word has length 213 [2020-08-22 23:01:41,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:41,347 INFO L479 AbstractCegarLoop]: Abstraction has 342 states and 357 transitions. [2020-08-22 23:01:41,347 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-22 23:01:41,348 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 357 transitions. [2020-08-22 23:01:41,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2020-08-22 23:01:41,350 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:41,350 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:41,351 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-22 23:01:41,351 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:41,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:41,351 INFO L82 PathProgramCache]: Analyzing trace with hash 165101353, now seen corresponding path program 12 times [2020-08-22 23:01:41,351 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:41,351 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [177092312] [2020-08-22 23:01:41,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:41,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:41,598 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:41,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:41,629 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 100 proven. 69 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-08-22 23:01:41,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [177092312] [2020-08-22 23:01:41,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:41,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-22 23:01:41,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950006834] [2020-08-22 23:01:41,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-22 23:01:41,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:41,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-22 23:01:41,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=393, Unknown=0, NotChecked=0, Total=462 [2020-08-22 23:01:41,631 INFO L87 Difference]: Start difference. First operand 342 states and 357 transitions. Second operand 22 states. [2020-08-22 23:01:43,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:43,116 INFO L93 Difference]: Finished difference Result 855 states and 905 transitions. [2020-08-22 23:01:43,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-08-22 23:01:43,117 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 225 [2020-08-22 23:01:43,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:43,122 INFO L225 Difference]: With dead ends: 855 [2020-08-22 23:01:43,122 INFO L226 Difference]: Without dead ends: 735 [2020-08-22 23:01:43,125 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1374 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=768, Invalid=4202, Unknown=0, NotChecked=0, Total=4970 [2020-08-22 23:01:43,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 735 states. [2020-08-22 23:01:43,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 735 to 406. [2020-08-22 23:01:43,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 406 states. [2020-08-22 23:01:43,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 406 states to 406 states and 425 transitions. [2020-08-22 23:01:43,171 INFO L78 Accepts]: Start accepts. Automaton has 406 states and 425 transitions. Word has length 225 [2020-08-22 23:01:43,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:43,171 INFO L479 AbstractCegarLoop]: Abstraction has 406 states and 425 transitions. [2020-08-22 23:01:43,171 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-22 23:01:43,171 INFO L276 IsEmpty]: Start isEmpty. Operand 406 states and 425 transitions. [2020-08-22 23:01:43,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2020-08-22 23:01:43,174 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:43,174 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:43,174 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-22 23:01:43,174 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:43,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:43,175 INFO L82 PathProgramCache]: Analyzing trace with hash 685287153, now seen corresponding path program 13 times [2020-08-22 23:01:43,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:43,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2040929661] [2020-08-22 23:01:43,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:43,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:43,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:43,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:43,766 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 80 proven. 115 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-08-22 23:01:43,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2040929661] [2020-08-22 23:01:43,766 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:43,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-22 23:01:43,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868115174] [2020-08-22 23:01:43,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-22 23:01:43,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:43,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-22 23:01:43,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=660, Unknown=0, NotChecked=0, Total=756 [2020-08-22 23:01:43,769 INFO L87 Difference]: Start difference. First operand 406 states and 425 transitions. Second operand 28 states. [2020-08-22 23:01:45,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:45,040 INFO L93 Difference]: Finished difference Result 706 states and 745 transitions. [2020-08-22 23:01:45,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-22 23:01:45,040 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 231 [2020-08-22 23:01:45,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:45,043 INFO L225 Difference]: With dead ends: 706 [2020-08-22 23:01:45,043 INFO L226 Difference]: Without dead ends: 442 [2020-08-22 23:01:45,045 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 687 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=421, Invalid=2659, Unknown=0, NotChecked=0, Total=3080 [2020-08-22 23:01:45,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2020-08-22 23:01:45,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 430. [2020-08-22 23:01:45,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 430 states. [2020-08-22 23:01:45,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 449 transitions. [2020-08-22 23:01:45,087 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 449 transitions. Word has length 231 [2020-08-22 23:01:45,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:45,087 INFO L479 AbstractCegarLoop]: Abstraction has 430 states and 449 transitions. [2020-08-22 23:01:45,087 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-22 23:01:45,087 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 449 transitions. [2020-08-22 23:01:45,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-08-22 23:01:45,089 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:45,090 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:45,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-22 23:01:45,090 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:45,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:45,090 INFO L82 PathProgramCache]: Analyzing trace with hash 232629785, now seen corresponding path program 14 times [2020-08-22 23:01:45,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:45,091 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2033321695] [2020-08-22 23:01:45,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:45,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:45,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:45,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:45,592 INFO L134 CoverageAnalysis]: Checked inductivity of 447 backedges. 75 proven. 152 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-08-22 23:01:45,592 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2033321695] [2020-08-22 23:01:45,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:45,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-22 23:01:45,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475450714] [2020-08-22 23:01:45,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-22 23:01:45,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:45,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-22 23:01:45,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=751, Unknown=0, NotChecked=0, Total=870 [2020-08-22 23:01:45,594 INFO L87 Difference]: Start difference. First operand 430 states and 449 transitions. Second operand 30 states. [2020-08-22 23:01:46,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:46,836 INFO L93 Difference]: Finished difference Result 516 states and 537 transitions. [2020-08-22 23:01:46,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-22 23:01:46,836 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 237 [2020-08-22 23:01:46,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:46,840 INFO L225 Difference]: With dead ends: 516 [2020-08-22 23:01:46,841 INFO L226 Difference]: Without dead ends: 510 [2020-08-22 23:01:46,843 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 943 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=795, Invalid=3627, Unknown=0, NotChecked=0, Total=4422 [2020-08-22 23:01:46,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 510 states. [2020-08-22 23:01:46,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 510 to 442. [2020-08-22 23:01:46,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 442 states. [2020-08-22 23:01:46,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 442 states to 442 states and 462 transitions. [2020-08-22 23:01:46,889 INFO L78 Accepts]: Start accepts. Automaton has 442 states and 462 transitions. Word has length 237 [2020-08-22 23:01:46,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:46,889 INFO L479 AbstractCegarLoop]: Abstraction has 442 states and 462 transitions. [2020-08-22 23:01:46,889 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-22 23:01:46,890 INFO L276 IsEmpty]: Start isEmpty. Operand 442 states and 462 transitions. [2020-08-22 23:01:46,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-08-22 23:01:46,892 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:46,892 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:46,892 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-22 23:01:46,893 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:46,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:46,893 INFO L82 PathProgramCache]: Analyzing trace with hash -2051456095, now seen corresponding path program 15 times [2020-08-22 23:01:46,893 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:46,894 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1749405837] [2020-08-22 23:01:46,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:46,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:47,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:47,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:47,328 INFO L134 CoverageAnalysis]: Checked inductivity of 508 backedges. 153 proven. 103 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2020-08-22 23:01:47,328 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1749405837] [2020-08-22 23:01:47,329 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:47,329 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-22 23:01:47,329 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388801826] [2020-08-22 23:01:47,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-22 23:01:47,330 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:47,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-22 23:01:47,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2020-08-22 23:01:47,331 INFO L87 Difference]: Start difference. First operand 442 states and 462 transitions. Second operand 26 states. [2020-08-22 23:01:49,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:49,815 INFO L93 Difference]: Finished difference Result 1219 states and 1292 transitions. [2020-08-22 23:01:49,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2020-08-22 23:01:49,820 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 249 [2020-08-22 23:01:49,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:49,826 INFO L225 Difference]: With dead ends: 1219 [2020-08-22 23:01:49,826 INFO L226 Difference]: Without dead ends: 1078 [2020-08-22 23:01:49,831 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3215 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1564, Invalid=8536, Unknown=0, NotChecked=0, Total=10100 [2020-08-22 23:01:49,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1078 states. [2020-08-22 23:01:49,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1078 to 512. [2020-08-22 23:01:49,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 512 states. [2020-08-22 23:01:49,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 512 states to 512 states and 536 transitions. [2020-08-22 23:01:49,912 INFO L78 Accepts]: Start accepts. Automaton has 512 states and 536 transitions. Word has length 249 [2020-08-22 23:01:49,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:49,912 INFO L479 AbstractCegarLoop]: Abstraction has 512 states and 536 transitions. [2020-08-22 23:01:49,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-22 23:01:49,912 INFO L276 IsEmpty]: Start isEmpty. Operand 512 states and 536 transitions. [2020-08-22 23:01:49,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 252 [2020-08-22 23:01:49,915 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:49,915 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:49,915 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-22 23:01:49,915 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:49,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:49,916 INFO L82 PathProgramCache]: Analyzing trace with hash 932737505, now seen corresponding path program 1 times [2020-08-22 23:01:49,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:49,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [689969001] [2020-08-22 23:01:49,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:49,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:50,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:50,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:50,344 INFO L134 CoverageAnalysis]: Checked inductivity of 550 backedges. 202 proven. 96 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2020-08-22 23:01:50,345 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [689969001] [2020-08-22 23:01:50,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:50,345 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-22 23:01:50,348 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461822527] [2020-08-22 23:01:50,349 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-22 23:01:50,349 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:50,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-22 23:01:50,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2020-08-22 23:01:50,350 INFO L87 Difference]: Start difference. First operand 512 states and 536 transitions. Second operand 25 states. [2020-08-22 23:01:51,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:51,102 INFO L93 Difference]: Finished difference Result 633 states and 664 transitions. [2020-08-22 23:01:51,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-22 23:01:51,102 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 251 [2020-08-22 23:01:51,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:51,105 INFO L225 Difference]: With dead ends: 633 [2020-08-22 23:01:51,106 INFO L226 Difference]: Without dead ends: 468 [2020-08-22 23:01:51,107 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 434 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=244, Invalid=1478, Unknown=0, NotChecked=0, Total=1722 [2020-08-22 23:01:51,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 468 states. [2020-08-22 23:01:51,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 468 to 468. [2020-08-22 23:01:51,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 468 states. [2020-08-22 23:01:51,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 490 transitions. [2020-08-22 23:01:51,160 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 490 transitions. Word has length 251 [2020-08-22 23:01:51,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:51,160 INFO L479 AbstractCegarLoop]: Abstraction has 468 states and 490 transitions. [2020-08-22 23:01:51,160 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-22 23:01:51,160 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 490 transitions. [2020-08-22 23:01:51,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2020-08-22 23:01:51,162 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:51,163 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:51,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-22 23:01:51,163 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:51,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:51,163 INFO L82 PathProgramCache]: Analyzing trace with hash -1502489751, now seen corresponding path program 16 times [2020-08-22 23:01:51,164 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:51,164 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [145363700] [2020-08-22 23:01:51,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:51,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:53,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:53,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:54,033 INFO L134 CoverageAnalysis]: Checked inductivity of 540 backedges. 89 proven. 257 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2020-08-22 23:01:54,034 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [145363700] [2020-08-22 23:01:54,034 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:54,034 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-22 23:01:54,034 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547551233] [2020-08-22 23:01:54,035 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-22 23:01:54,035 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:54,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-22 23:01:54,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1886, Unknown=0, NotChecked=0, Total=2070 [2020-08-22 23:01:54,036 INFO L87 Difference]: Start difference. First operand 468 states and 490 transitions. Second operand 46 states. [2020-08-22 23:02:01,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:01,275 INFO L93 Difference]: Finished difference Result 959 states and 1017 transitions. [2020-08-22 23:02:01,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2020-08-22 23:02:01,275 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 255 [2020-08-22 23:02:01,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:01,281 INFO L225 Difference]: With dead ends: 959 [2020-08-22 23:02:01,281 INFO L226 Difference]: Without dead ends: 876 [2020-08-22 23:02:01,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2312 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=746, Invalid=10596, Unknown=0, NotChecked=0, Total=11342 [2020-08-22 23:02:01,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 876 states. [2020-08-22 23:02:01,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 876 to 472. [2020-08-22 23:02:01,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 472 states. [2020-08-22 23:02:01,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 495 transitions. [2020-08-22 23:02:01,363 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 495 transitions. Word has length 255 [2020-08-22 23:02:01,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:01,363 INFO L479 AbstractCegarLoop]: Abstraction has 472 states and 495 transitions. [2020-08-22 23:02:01,364 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-22 23:02:01,364 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 495 transitions. [2020-08-22 23:02:01,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2020-08-22 23:02:01,366 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:01,366 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:01,367 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-22 23:02:01,367 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:01,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:01,368 INFO L82 PathProgramCache]: Analyzing trace with hash 208416681, now seen corresponding path program 2 times [2020-08-22 23:02:01,368 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:01,368 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [455548119] [2020-08-22 23:02:01,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:01,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:01,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:01,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:01,865 INFO L134 CoverageAnalysis]: Checked inductivity of 564 backedges. 202 proven. 110 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2020-08-22 23:02:01,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [455548119] [2020-08-22 23:02:01,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:02:01,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-22 23:02:01,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872831974] [2020-08-22 23:02:01,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-22 23:02:01,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:01,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-22 23:02:01,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=608, Unknown=0, NotChecked=0, Total=702 [2020-08-22 23:02:01,868 INFO L87 Difference]: Start difference. First operand 472 states and 495 transitions. Second operand 27 states. [2020-08-22 23:02:03,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:03,144 INFO L93 Difference]: Finished difference Result 743 states and 784 transitions. [2020-08-22 23:02:03,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-22 23:02:03,145 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 257 [2020-08-22 23:02:03,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:03,148 INFO L225 Difference]: With dead ends: 743 [2020-08-22 23:02:03,148 INFO L226 Difference]: Without dead ends: 586 [2020-08-22 23:02:03,149 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 892 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=460, Invalid=2846, Unknown=0, NotChecked=0, Total=3306 [2020-08-22 23:02:03,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2020-08-22 23:02:03,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 484. [2020-08-22 23:02:03,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 484 states. [2020-08-22 23:02:03,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 507 transitions. [2020-08-22 23:02:03,216 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 507 transitions. Word has length 257 [2020-08-22 23:02:03,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:03,216 INFO L479 AbstractCegarLoop]: Abstraction has 484 states and 507 transitions. [2020-08-22 23:02:03,216 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-22 23:02:03,217 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 507 transitions. [2020-08-22 23:02:03,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2020-08-22 23:02:03,219 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:03,219 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:03,219 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-22 23:02:03,219 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:03,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:03,220 INFO L82 PathProgramCache]: Analyzing trace with hash -1021540487, now seen corresponding path program 3 times [2020-08-22 23:02:03,220 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:03,220 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1532471005] [2020-08-22 23:02:03,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:03,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:03,626 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:03,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:03,703 INFO L134 CoverageAnalysis]: Checked inductivity of 565 backedges. 190 proven. 123 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2020-08-22 23:02:03,703 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1532471005] [2020-08-22 23:02:03,703 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:02:03,704 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-22 23:02:03,704 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586527389] [2020-08-22 23:02:03,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-22 23:02:03,704 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:03,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-22 23:02:03,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=693, Unknown=0, NotChecked=0, Total=812 [2020-08-22 23:02:03,705 INFO L87 Difference]: Start difference. First operand 484 states and 507 transitions. Second operand 29 states. [2020-08-22 23:02:06,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:06,907 INFO L93 Difference]: Finished difference Result 1405 states and 1490 transitions. [2020-08-22 23:02:06,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2020-08-22 23:02:06,911 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 263 [2020-08-22 23:02:06,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:06,915 INFO L225 Difference]: With dead ends: 1405 [2020-08-22 23:02:06,915 INFO L226 Difference]: Without dead ends: 1264 [2020-08-22 23:02:06,918 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4907 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2211, Invalid=12309, Unknown=0, NotChecked=0, Total=14520 [2020-08-22 23:02:06,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1264 states. [2020-08-22 23:02:07,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1264 to 542. [2020-08-22 23:02:07,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 542 states. [2020-08-22 23:02:07,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 542 states to 542 states and 568 transitions. [2020-08-22 23:02:07,018 INFO L78 Accepts]: Start accepts. Automaton has 542 states and 568 transitions. Word has length 263 [2020-08-22 23:02:07,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:07,019 INFO L479 AbstractCegarLoop]: Abstraction has 542 states and 568 transitions. [2020-08-22 23:02:07,019 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-22 23:02:07,019 INFO L276 IsEmpty]: Start isEmpty. Operand 542 states and 568 transitions. [2020-08-22 23:02:07,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2020-08-22 23:02:07,022 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:07,022 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:07,022 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-22 23:02:07,022 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:07,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:07,023 INFO L82 PathProgramCache]: Analyzing trace with hash 77363057, now seen corresponding path program 4 times [2020-08-22 23:02:07,023 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:07,023 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [761096516] [2020-08-22 23:02:07,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:07,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:07,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:07,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:07,500 INFO L134 CoverageAnalysis]: Checked inductivity of 584 backedges. 202 proven. 130 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2020-08-22 23:02:07,501 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [761096516] [2020-08-22 23:02:07,501 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:02:07,501 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-22 23:02:07,501 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963018275] [2020-08-22 23:02:07,502 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-22 23:02:07,502 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:07,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-22 23:02:07,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=707, Unknown=0, NotChecked=0, Total=812 [2020-08-22 23:02:07,502 INFO L87 Difference]: Start difference. First operand 542 states and 568 transitions. Second operand 29 states. [2020-08-22 23:02:09,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:09,796 INFO L93 Difference]: Finished difference Result 998 states and 1055 transitions. [2020-08-22 23:02:09,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2020-08-22 23:02:09,797 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 263 [2020-08-22 23:02:09,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:09,801 INFO L225 Difference]: With dead ends: 998 [2020-08-22 23:02:09,801 INFO L226 Difference]: Without dead ends: 875 [2020-08-22 23:02:09,802 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2078 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=914, Invalid=6058, Unknown=0, NotChecked=0, Total=6972 [2020-08-22 23:02:09,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 875 states. [2020-08-22 23:02:09,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 875 to 598. [2020-08-22 23:02:09,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 598 states. [2020-08-22 23:02:09,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 598 states to 598 states and 628 transitions. [2020-08-22 23:02:09,949 INFO L78 Accepts]: Start accepts. Automaton has 598 states and 628 transitions. Word has length 263 [2020-08-22 23:02:09,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:09,950 INFO L479 AbstractCegarLoop]: Abstraction has 598 states and 628 transitions. [2020-08-22 23:02:09,950 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-22 23:02:09,950 INFO L276 IsEmpty]: Start isEmpty. Operand 598 states and 628 transitions. [2020-08-22 23:02:09,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2020-08-22 23:02:09,953 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:09,953 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:09,953 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-22 23:02:09,954 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:09,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:09,954 INFO L82 PathProgramCache]: Analyzing trace with hash 93968705, now seen corresponding path program 5 times [2020-08-22 23:02:09,954 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:09,955 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1625587441] [2020-08-22 23:02:09,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:09,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:10,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:10,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:10,480 INFO L134 CoverageAnalysis]: Checked inductivity of 603 backedges. 108 proven. 134 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2020-08-22 23:02:10,481 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1625587441] [2020-08-22 23:02:10,481 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:02:10,481 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-22 23:02:10,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425284043] [2020-08-22 23:02:10,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-22 23:02:10,483 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:10,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-22 23:02:10,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=785, Unknown=0, NotChecked=0, Total=930 [2020-08-22 23:02:10,484 INFO L87 Difference]: Start difference. First operand 598 states and 628 transitions. Second operand 31 states. [2020-08-22 23:02:13,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:13,336 INFO L93 Difference]: Finished difference Result 1232 states and 1311 transitions. [2020-08-22 23:02:13,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2020-08-22 23:02:13,337 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 269 [2020-08-22 23:02:13,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:13,341 INFO L225 Difference]: With dead ends: 1232 [2020-08-22 23:02:13,341 INFO L226 Difference]: Without dead ends: 1093 [2020-08-22 23:02:13,343 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3701 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2406, Invalid=9366, Unknown=0, NotChecked=0, Total=11772 [2020-08-22 23:02:13,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1093 states. [2020-08-22 23:02:13,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1093 to 604. [2020-08-22 23:02:13,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 604 states. [2020-08-22 23:02:13,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 604 states to 604 states and 634 transitions. [2020-08-22 23:02:13,446 INFO L78 Accepts]: Start accepts. Automaton has 604 states and 634 transitions. Word has length 269 [2020-08-22 23:02:13,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:13,447 INFO L479 AbstractCegarLoop]: Abstraction has 604 states and 634 transitions. [2020-08-22 23:02:13,447 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-22 23:02:13,447 INFO L276 IsEmpty]: Start isEmpty. Operand 604 states and 634 transitions. [2020-08-22 23:02:13,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2020-08-22 23:02:13,449 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:13,449 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:13,450 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-22 23:02:13,450 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:13,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:13,450 INFO L82 PathProgramCache]: Analyzing trace with hash 1192872249, now seen corresponding path program 6 times [2020-08-22 23:02:13,450 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:13,450 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [979333773] [2020-08-22 23:02:13,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:13,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:13,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:13,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:13,924 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 206 proven. 140 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2020-08-22 23:02:13,924 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [979333773] [2020-08-22 23:02:13,924 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:02:13,924 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-22 23:02:13,924 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151823761] [2020-08-22 23:02:13,925 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-22 23:02:13,925 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:13,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-22 23:02:13,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=707, Unknown=0, NotChecked=0, Total=812 [2020-08-22 23:02:13,925 INFO L87 Difference]: Start difference. First operand 604 states and 634 transitions. Second operand 29 states. [2020-08-22 23:02:18,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:18,045 INFO L93 Difference]: Finished difference Result 1330 states and 1408 transitions. [2020-08-22 23:02:18,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2020-08-22 23:02:18,046 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 269 [2020-08-22 23:02:18,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:18,051 INFO L225 Difference]: With dead ends: 1330 [2020-08-22 23:02:18,051 INFO L226 Difference]: Without dead ends: 1198 [2020-08-22 23:02:18,054 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5459 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2146, Invalid=13856, Unknown=0, NotChecked=0, Total=16002 [2020-08-22 23:02:18,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1198 states. [2020-08-22 23:02:18,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1198 to 680. [2020-08-22 23:02:18,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 680 states. [2020-08-22 23:02:18,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 680 states to 680 states and 716 transitions. [2020-08-22 23:02:18,203 INFO L78 Accepts]: Start accepts. Automaton has 680 states and 716 transitions. Word has length 269 [2020-08-22 23:02:18,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:18,203 INFO L479 AbstractCegarLoop]: Abstraction has 680 states and 716 transitions. [2020-08-22 23:02:18,204 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-22 23:02:18,204 INFO L276 IsEmpty]: Start isEmpty. Operand 680 states and 716 transitions. [2020-08-22 23:02:18,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2020-08-22 23:02:18,205 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:18,206 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:18,206 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-22 23:02:18,206 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:18,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:18,206 INFO L82 PathProgramCache]: Analyzing trace with hash -1541831375, now seen corresponding path program 7 times [2020-08-22 23:02:18,207 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:18,207 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1871680624] [2020-08-22 23:02:18,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:18,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:18,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:18,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:18,736 INFO L134 CoverageAnalysis]: Checked inductivity of 653 backedges. 230 proven. 154 refuted. 0 times theorem prover too weak. 269 trivial. 0 not checked. [2020-08-22 23:02:18,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1871680624] [2020-08-22 23:02:18,737 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:02:18,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-22 23:02:18,738 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758985911] [2020-08-22 23:02:18,739 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-22 23:02:18,739 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:18,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-22 23:02:18,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=665, Unknown=0, NotChecked=0, Total=756 [2020-08-22 23:02:18,740 INFO L87 Difference]: Start difference. First operand 680 states and 716 transitions. Second operand 28 states. [2020-08-22 23:02:20,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:20,542 INFO L93 Difference]: Finished difference Result 834 states and 879 transitions. [2020-08-22 23:02:20,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-22 23:02:20,543 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 269 [2020-08-22 23:02:20,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:20,546 INFO L225 Difference]: With dead ends: 834 [2020-08-22 23:02:20,547 INFO L226 Difference]: Without dead ends: 624 [2020-08-22 23:02:20,548 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1052 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=597, Invalid=3435, Unknown=0, NotChecked=0, Total=4032 [2020-08-22 23:02:20,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 624 states. [2020-08-22 23:02:20,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 624 to 624. [2020-08-22 23:02:20,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 624 states. [2020-08-22 23:02:20,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 624 states to 624 states and 658 transitions. [2020-08-22 23:02:20,673 INFO L78 Accepts]: Start accepts. Automaton has 624 states and 658 transitions. Word has length 269 [2020-08-22 23:02:20,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:20,674 INFO L479 AbstractCegarLoop]: Abstraction has 624 states and 658 transitions. [2020-08-22 23:02:20,674 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-22 23:02:20,674 INFO L276 IsEmpty]: Start isEmpty. Operand 624 states and 658 transitions. [2020-08-22 23:02:20,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2020-08-22 23:02:20,676 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:20,676 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:20,676 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-22 23:02:20,676 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:20,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:20,677 INFO L82 PathProgramCache]: Analyzing trace with hash -2027730327, now seen corresponding path program 8 times [2020-08-22 23:02:20,677 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:20,677 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1205567219] [2020-08-22 23:02:20,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:20,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:21,283 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:21,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:21,332 INFO L134 CoverageAnalysis]: Checked inductivity of 641 backedges. 112 proven. 239 refuted. 0 times theorem prover too weak. 290 trivial. 0 not checked. [2020-08-22 23:02:21,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1205567219] [2020-08-22 23:02:21,332 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:02:21,332 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-22 23:02:21,333 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144023547] [2020-08-22 23:02:21,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-22 23:02:21,334 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:21,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-22 23:02:21,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1049, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 23:02:21,335 INFO L87 Difference]: Start difference. First operand 624 states and 658 transitions. Second operand 35 states. [2020-08-22 23:02:24,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:24,093 INFO L93 Difference]: Finished difference Result 1014 states and 1076 transitions. [2020-08-22 23:02:24,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-08-22 23:02:24,094 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 275 [2020-08-22 23:02:24,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:24,099 INFO L225 Difference]: With dead ends: 1014 [2020-08-22 23:02:24,099 INFO L226 Difference]: Without dead ends: 1008 [2020-08-22 23:02:24,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1485 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1241, Invalid=5565, Unknown=0, NotChecked=0, Total=6806 [2020-08-22 23:02:24,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1008 states. [2020-08-22 23:02:24,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1008 to 761. [2020-08-22 23:02:24,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 761 states. [2020-08-22 23:02:24,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 761 states to 761 states and 806 transitions. [2020-08-22 23:02:24,274 INFO L78 Accepts]: Start accepts. Automaton has 761 states and 806 transitions. Word has length 275 [2020-08-22 23:02:24,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:24,274 INFO L479 AbstractCegarLoop]: Abstraction has 761 states and 806 transitions. [2020-08-22 23:02:24,274 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-22 23:02:24,274 INFO L276 IsEmpty]: Start isEmpty. Operand 761 states and 806 transitions. [2020-08-22 23:02:24,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2020-08-22 23:02:24,276 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:24,276 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:24,276 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-22 23:02:24,277 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:24,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:24,277 INFO L82 PathProgramCache]: Analyzing trace with hash 611624193, now seen corresponding path program 9 times [2020-08-22 23:02:24,277 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:24,278 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1444919517] [2020-08-22 23:02:24,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:24,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:24,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:24,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:24,905 INFO L134 CoverageAnalysis]: Checked inductivity of 642 backedges. 202 proven. 188 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2020-08-22 23:02:24,905 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1444919517] [2020-08-22 23:02:24,905 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:02:24,905 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-22 23:02:24,906 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142122935] [2020-08-22 23:02:24,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-22 23:02:24,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:24,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-22 23:02:24,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=923, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 23:02:24,907 INFO L87 Difference]: Start difference. First operand 761 states and 806 transitions. Second operand 33 states. [2020-08-22 23:02:31,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:31,159 INFO L93 Difference]: Finished difference Result 1593 states and 1688 transitions. [2020-08-22 23:02:31,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 161 states. [2020-08-22 23:02:31,160 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 275 [2020-08-22 23:02:31,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:31,166 INFO L225 Difference]: With dead ends: 1593 [2020-08-22 23:02:31,166 INFO L226 Difference]: Without dead ends: 1452 [2020-08-22 23:02:31,169 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12564 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=4283, Invalid=28659, Unknown=0, NotChecked=0, Total=32942 [2020-08-22 23:02:31,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1452 states. [2020-08-22 23:02:31,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1452 to 797. [2020-08-22 23:02:31,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 797 states. [2020-08-22 23:02:31,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 797 states to 797 states and 844 transitions. [2020-08-22 23:02:31,386 INFO L78 Accepts]: Start accepts. Automaton has 797 states and 844 transitions. Word has length 275 [2020-08-22 23:02:31,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:31,386 INFO L479 AbstractCegarLoop]: Abstraction has 797 states and 844 transitions. [2020-08-22 23:02:31,386 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-22 23:02:31,386 INFO L276 IsEmpty]: Start isEmpty. Operand 797 states and 844 transitions. [2020-08-22 23:02:31,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2020-08-22 23:02:31,388 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:31,388 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:31,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-22 23:02:31,388 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:31,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:31,389 INFO L82 PathProgramCache]: Analyzing trace with hash -2123079431, now seen corresponding path program 10 times [2020-08-22 23:02:31,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:31,389 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1051070271] [2020-08-22 23:02:31,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:31,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:31,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:31,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:32,070 INFO L134 CoverageAnalysis]: Checked inductivity of 673 backedges. 230 proven. 174 refuted. 0 times theorem prover too weak. 269 trivial. 0 not checked. [2020-08-22 23:02:32,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1051070271] [2020-08-22 23:02:32,070 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:02:32,070 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-22 23:02:32,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302726352] [2020-08-22 23:02:32,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-22 23:02:32,071 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:32,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-22 23:02:32,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=768, Unknown=0, NotChecked=0, Total=870 [2020-08-22 23:02:32,072 INFO L87 Difference]: Start difference. First operand 797 states and 844 transitions. Second operand 30 states. [2020-08-22 23:02:34,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:34,679 INFO L93 Difference]: Finished difference Result 1115 states and 1179 transitions. [2020-08-22 23:02:34,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-08-22 23:02:34,679 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 275 [2020-08-22 23:02:34,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:34,683 INFO L225 Difference]: With dead ends: 1115 [2020-08-22 23:02:34,683 INFO L226 Difference]: Without dead ends: 697 [2020-08-22 23:02:34,685 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1774 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=970, Invalid=5510, Unknown=0, NotChecked=0, Total=6480 [2020-08-22 23:02:34,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 697 states. [2020-08-22 23:02:34,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 697 to 697. [2020-08-22 23:02:34,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 697 states. [2020-08-22 23:02:34,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 697 states to 697 states and 738 transitions. [2020-08-22 23:02:34,848 INFO L78 Accepts]: Start accepts. Automaton has 697 states and 738 transitions. Word has length 275 [2020-08-22 23:02:34,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:34,848 INFO L479 AbstractCegarLoop]: Abstraction has 697 states and 738 transitions. [2020-08-22 23:02:34,848 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-22 23:02:34,848 INFO L276 IsEmpty]: Start isEmpty. Operand 697 states and 738 transitions. [2020-08-22 23:02:34,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 282 [2020-08-22 23:02:34,849 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:34,850 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:34,850 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-22 23:02:34,850 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:34,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:34,850 INFO L82 PathProgramCache]: Analyzing trace with hash -1143126335, now seen corresponding path program 11 times [2020-08-22 23:02:34,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:34,852 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1676708805] [2020-08-22 23:02:34,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:34,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:35,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:35,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:35,464 INFO L134 CoverageAnalysis]: Checked inductivity of 699 backedges. 230 proven. 200 refuted. 0 times theorem prover too weak. 269 trivial. 0 not checked. [2020-08-22 23:02:35,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1676708805] [2020-08-22 23:02:35,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:02:35,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-22 23:02:35,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801432587] [2020-08-22 23:02:35,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-22 23:02:35,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:35,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-22 23:02:35,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=877, Unknown=0, NotChecked=0, Total=992 [2020-08-22 23:02:35,466 INFO L87 Difference]: Start difference. First operand 697 states and 738 transitions. Second operand 32 states. [2020-08-22 23:02:38,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:38,936 INFO L93 Difference]: Finished difference Result 1161 states and 1230 transitions. [2020-08-22 23:02:38,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2020-08-22 23:02:38,937 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 281 [2020-08-22 23:02:38,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:38,940 INFO L225 Difference]: With dead ends: 1161 [2020-08-22 23:02:38,940 INFO L226 Difference]: Without dead ends: 577 [2020-08-22 23:02:38,942 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2611 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1404, Invalid=7908, Unknown=0, NotChecked=0, Total=9312 [2020-08-22 23:02:38,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 577 states. [2020-08-22 23:02:39,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 577 to 577. [2020-08-22 23:02:39,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 577 states. [2020-08-22 23:02:39,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 577 states to 577 states and 610 transitions. [2020-08-22 23:02:39,092 INFO L78 Accepts]: Start accepts. Automaton has 577 states and 610 transitions. Word has length 281 [2020-08-22 23:02:39,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:39,092 INFO L479 AbstractCegarLoop]: Abstraction has 577 states and 610 transitions. [2020-08-22 23:02:39,092 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-22 23:02:39,092 INFO L276 IsEmpty]: Start isEmpty. Operand 577 states and 610 transitions. [2020-08-22 23:02:39,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2020-08-22 23:02:39,094 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:39,094 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:39,094 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-22 23:02:39,094 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:39,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:39,094 INFO L82 PathProgramCache]: Analyzing trace with hash -1197805583, now seen corresponding path program 12 times [2020-08-22 23:02:39,094 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:39,094 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1958296046] [2020-08-22 23:02:39,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:39,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:39,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:39,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:39,723 INFO L134 CoverageAnalysis]: Checked inductivity of 718 backedges. 263 proven. 165 refuted. 0 times theorem prover too weak. 290 trivial. 0 not checked. [2020-08-22 23:02:39,723 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1958296046] [2020-08-22 23:02:39,723 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:02:39,723 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-22 23:02:39,724 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112816250] [2020-08-22 23:02:39,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-22 23:02:39,724 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:39,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-22 23:02:39,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=905, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 23:02:39,724 INFO L87 Difference]: Start difference. First operand 577 states and 610 transitions. Second operand 33 states. [2020-08-22 23:02:43,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:43,560 INFO L93 Difference]: Finished difference Result 1377 states and 1463 transitions. [2020-08-22 23:02:43,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2020-08-22 23:02:43,561 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 287 [2020-08-22 23:02:43,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:43,565 INFO L225 Difference]: With dead ends: 1377 [2020-08-22 23:02:43,565 INFO L226 Difference]: Without dead ends: 1215 [2020-08-22 23:02:43,567 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3725 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1878, Invalid=10554, Unknown=0, NotChecked=0, Total=12432 [2020-08-22 23:02:43,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1215 states. [2020-08-22 23:02:43,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1215 to 685. [2020-08-22 23:02:43,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 685 states. [2020-08-22 23:02:43,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 685 states to 685 states and 725 transitions. [2020-08-22 23:02:43,756 INFO L78 Accepts]: Start accepts. Automaton has 685 states and 725 transitions. Word has length 287 [2020-08-22 23:02:43,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:43,756 INFO L479 AbstractCegarLoop]: Abstraction has 685 states and 725 transitions. [2020-08-22 23:02:43,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-22 23:02:43,756 INFO L276 IsEmpty]: Start isEmpty. Operand 685 states and 725 transitions. [2020-08-22 23:02:43,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2020-08-22 23:02:43,757 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:43,758 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:43,758 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-22 23:02:43,758 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:43,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:43,758 INFO L82 PathProgramCache]: Analyzing trace with hash -819677559, now seen corresponding path program 13 times [2020-08-22 23:02:43,759 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:43,759 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [678115502] [2020-08-22 23:02:43,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:43,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:44,610 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:44,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:44,782 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 214 proven. 260 refuted. 0 times theorem prover too weak. 257 trivial. 0 not checked. [2020-08-22 23:02:44,783 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [678115502] [2020-08-22 23:02:44,785 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:02:44,785 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-22 23:02:44,786 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [40293187] [2020-08-22 23:02:44,786 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-22 23:02:44,787 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:44,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-22 23:02:44,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1117, Unknown=0, NotChecked=0, Total=1260 [2020-08-22 23:02:44,789 INFO L87 Difference]: Start difference. First operand 685 states and 725 transitions. Second operand 36 states. [2020-08-22 23:02:49,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:49,455 INFO L93 Difference]: Finished difference Result 1226 states and 1299 transitions. [2020-08-22 23:02:49,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2020-08-22 23:02:49,456 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 287 [2020-08-22 23:02:49,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:49,459 INFO L225 Difference]: With dead ends: 1226 [2020-08-22 23:02:49,459 INFO L226 Difference]: Without dead ends: 444 [2020-08-22 23:02:49,461 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3802 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=1930, Invalid=11180, Unknown=0, NotChecked=0, Total=13110 [2020-08-22 23:02:49,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 444 states. [2020-08-22 23:02:49,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 444 to 444. [2020-08-22 23:02:49,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 444 states. [2020-08-22 23:02:49,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 444 states to 444 states and 466 transitions. [2020-08-22 23:02:49,547 INFO L78 Accepts]: Start accepts. Automaton has 444 states and 466 transitions. Word has length 287 [2020-08-22 23:02:49,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:49,547 INFO L479 AbstractCegarLoop]: Abstraction has 444 states and 466 transitions. [2020-08-22 23:02:49,547 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-22 23:02:49,547 INFO L276 IsEmpty]: Start isEmpty. Operand 444 states and 466 transitions. [2020-08-22 23:02:49,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 294 [2020-08-22 23:02:49,549 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:49,550 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:49,550 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-22 23:02:49,550 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:49,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:49,551 INFO L82 PathProgramCache]: Analyzing trace with hash 573663673, now seen corresponding path program 14 times [2020-08-22 23:02:49,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:49,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [256335640] [2020-08-22 23:02:49,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:49,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:50,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:50,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:50,285 INFO L134 CoverageAnalysis]: Checked inductivity of 762 backedges. 147 proven. 177 refuted. 0 times theorem prover too weak. 438 trivial. 0 not checked. [2020-08-22 23:02:50,286 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [256335640] [2020-08-22 23:02:50,286 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:02:50,286 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-22 23:02:50,286 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835713460] [2020-08-22 23:02:50,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-22 23:02:50,286 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:50,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-22 23:02:50,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=1009, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 23:02:50,287 INFO L87 Difference]: Start difference. First operand 444 states and 466 transitions. Second operand 35 states. [2020-08-22 23:02:52,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:52,693 INFO L93 Difference]: Finished difference Result 753 states and 799 transitions. [2020-08-22 23:02:52,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2020-08-22 23:02:52,694 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 293 [2020-08-22 23:02:52,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:52,698 INFO L225 Difference]: With dead ends: 753 [2020-08-22 23:02:52,698 INFO L226 Difference]: Without dead ends: 602 [2020-08-22 23:02:52,699 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2274 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1588, Invalid=6602, Unknown=0, NotChecked=0, Total=8190 [2020-08-22 23:02:52,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 602 states. [2020-08-22 23:02:52,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 602 to 450. [2020-08-22 23:02:52,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 450 states. [2020-08-22 23:02:52,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 450 states to 450 states and 472 transitions. [2020-08-22 23:02:52,789 INFO L78 Accepts]: Start accepts. Automaton has 450 states and 472 transitions. Word has length 293 [2020-08-22 23:02:52,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:52,789 INFO L479 AbstractCegarLoop]: Abstraction has 450 states and 472 transitions. [2020-08-22 23:02:52,789 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-22 23:02:52,789 INFO L276 IsEmpty]: Start isEmpty. Operand 450 states and 472 transitions. [2020-08-22 23:02:52,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-08-22 23:02:52,790 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:52,790 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:52,791 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-22 23:02:52,791 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:52,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:52,791 INFO L82 PathProgramCache]: Analyzing trace with hash 681536225, now seen corresponding path program 15 times [2020-08-22 23:02:52,791 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:52,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [3428142] [2020-08-22 23:02:52,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:52,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:53,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:53,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:53,855 INFO L134 CoverageAnalysis]: Checked inductivity of 806 backedges. 151 proven. 321 refuted. 0 times theorem prover too weak. 334 trivial. 0 not checked. [2020-08-22 23:02:53,856 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [3428142] [2020-08-22 23:02:53,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:02:53,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-22 23:02:53,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505739919] [2020-08-22 23:02:53,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-22 23:02:53,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:53,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-22 23:02:53,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=1307, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 23:02:53,857 INFO L87 Difference]: Start difference. First operand 450 states and 472 transitions. Second operand 39 states. [2020-08-22 23:02:56,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:02:56,833 INFO L93 Difference]: Finished difference Result 642 states and 677 transitions. [2020-08-22 23:02:56,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-08-22 23:02:56,834 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 299 [2020-08-22 23:02:56,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:02:56,837 INFO L225 Difference]: With dead ends: 642 [2020-08-22 23:02:56,837 INFO L226 Difference]: Without dead ends: 636 [2020-08-22 23:02:56,838 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1834 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1497, Invalid=6693, Unknown=0, NotChecked=0, Total=8190 [2020-08-22 23:02:56,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 636 states. [2020-08-22 23:02:56,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 636 to 603. [2020-08-22 23:02:56,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 603 states. [2020-08-22 23:02:56,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 603 states to 603 states and 638 transitions. [2020-08-22 23:02:56,982 INFO L78 Accepts]: Start accepts. Automaton has 603 states and 638 transitions. Word has length 299 [2020-08-22 23:02:56,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:02:56,983 INFO L479 AbstractCegarLoop]: Abstraction has 603 states and 638 transitions. [2020-08-22 23:02:56,983 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-22 23:02:56,983 INFO L276 IsEmpty]: Start isEmpty. Operand 603 states and 638 transitions. [2020-08-22 23:02:56,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-08-22 23:02:56,984 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:02:56,984 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:02:56,985 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-22 23:02:56,985 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:02:56,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:02:56,985 INFO L82 PathProgramCache]: Analyzing trace with hash -1406527111, now seen corresponding path program 16 times [2020-08-22 23:02:56,985 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:02:56,985 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [293675746] [2020-08-22 23:02:56,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:02:57,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:57,834 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:02:57,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:02:57,894 INFO L134 CoverageAnalysis]: Checked inductivity of 807 backedges. 275 proven. 242 refuted. 0 times theorem prover too weak. 290 trivial. 0 not checked. [2020-08-22 23:02:57,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [293675746] [2020-08-22 23:02:57,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:02:57,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-22 23:02:57,894 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610372078] [2020-08-22 23:02:57,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-22 23:02:57,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:02:57,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-22 23:02:57,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=1167, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 23:02:57,896 INFO L87 Difference]: Start difference. First operand 603 states and 638 transitions. Second operand 37 states. [2020-08-22 23:03:02,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:03:02,688 INFO L93 Difference]: Finished difference Result 1132 states and 1201 transitions. [2020-08-22 23:03:02,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2020-08-22 23:03:02,690 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 299 [2020-08-22 23:03:02,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:03:02,695 INFO L225 Difference]: With dead ends: 1132 [2020-08-22 23:03:02,695 INFO L226 Difference]: Without dead ends: 970 [2020-08-22 23:03:02,697 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3921 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=1949, Invalid=11623, Unknown=0, NotChecked=0, Total=13572 [2020-08-22 23:03:02,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 970 states. [2020-08-22 23:03:02,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 970 to 651. [2020-08-22 23:03:02,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 651 states. [2020-08-22 23:03:02,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 651 states to 651 states and 689 transitions. [2020-08-22 23:03:02,877 INFO L78 Accepts]: Start accepts. Automaton has 651 states and 689 transitions. Word has length 299 [2020-08-22 23:03:02,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:03:02,877 INFO L479 AbstractCegarLoop]: Abstraction has 651 states and 689 transitions. [2020-08-22 23:03:02,877 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-22 23:03:02,877 INFO L276 IsEmpty]: Start isEmpty. Operand 651 states and 689 transitions. [2020-08-22 23:03:02,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 312 [2020-08-22 23:03:02,879 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:03:02,879 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:03:02,879 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-22 23:03:02,879 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:03:02,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:03:02,879 INFO L82 PathProgramCache]: Analyzing trace with hash 777133161, now seen corresponding path program 17 times [2020-08-22 23:03:02,880 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:03:02,880 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [841405544] [2020-08-22 23:03:02,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:03:02,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:03:03,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:03:03,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:03:03,689 INFO L134 CoverageAnalysis]: Checked inductivity of 895 backedges. 348 proven. 213 refuted. 0 times theorem prover too weak. 334 trivial. 0 not checked. [2020-08-22 23:03:03,690 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [841405544] [2020-08-22 23:03:03,690 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:03:03,690 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-22 23:03:03,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361320181] [2020-08-22 23:03:03,691 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-22 23:03:03,691 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:03:03,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-22 23:03:03,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=1145, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 23:03:03,691 INFO L87 Difference]: Start difference. First operand 651 states and 689 transitions. Second operand 37 states. [2020-08-22 23:03:08,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:03:08,775 INFO L93 Difference]: Finished difference Result 1611 states and 1714 transitions. [2020-08-22 23:03:08,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2020-08-22 23:03:08,775 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 311 [2020-08-22 23:03:08,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:03:08,781 INFO L225 Difference]: With dead ends: 1611 [2020-08-22 23:03:08,781 INFO L226 Difference]: Without dead ends: 1428 [2020-08-22 23:03:08,782 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5121 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=2518, Invalid=14252, Unknown=0, NotChecked=0, Total=16770 [2020-08-22 23:03:08,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1428 states. [2020-08-22 23:03:09,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1428 to 785. [2020-08-22 23:03:09,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 785 states. [2020-08-22 23:03:09,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 785 states to 785 states and 832 transitions. [2020-08-22 23:03:09,040 INFO L78 Accepts]: Start accepts. Automaton has 785 states and 832 transitions. Word has length 311 [2020-08-22 23:03:09,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:03:09,040 INFO L479 AbstractCegarLoop]: Abstraction has 785 states and 832 transitions. [2020-08-22 23:03:09,040 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-22 23:03:09,040 INFO L276 IsEmpty]: Start isEmpty. Operand 785 states and 832 transitions. [2020-08-22 23:03:09,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 312 [2020-08-22 23:03:09,042 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:03:09,042 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:03:09,042 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-22 23:03:09,042 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:03:09,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:03:09,043 INFO L82 PathProgramCache]: Analyzing trace with hash 1927231233, now seen corresponding path program 18 times [2020-08-22 23:03:09,043 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:03:09,043 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [438695979] [2020-08-22 23:03:09,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:03:09,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:03:10,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:03:10,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:03:10,126 INFO L134 CoverageAnalysis]: Checked inductivity of 908 backedges. 287 proven. 326 refuted. 0 times theorem prover too weak. 295 trivial. 0 not checked. [2020-08-22 23:03:10,126 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [438695979] [2020-08-22 23:03:10,126 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:03:10,126 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-22 23:03:10,127 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215022051] [2020-08-22 23:03:10,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-22 23:03:10,127 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:03:10,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-22 23:03:10,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=1385, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 23:03:10,128 INFO L87 Difference]: Start difference. First operand 785 states and 832 transitions. Second operand 40 states. [2020-08-22 23:03:16,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:03:16,291 INFO L93 Difference]: Finished difference Result 1484 states and 1576 transitions. [2020-08-22 23:03:16,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2020-08-22 23:03:16,292 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 311 [2020-08-22 23:03:16,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:03:16,295 INFO L225 Difference]: With dead ends: 1484 [2020-08-22 23:03:16,296 INFO L226 Difference]: Without dead ends: 494 [2020-08-22 23:03:16,299 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5219 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=2537, Invalid=15019, Unknown=0, NotChecked=0, Total=17556 [2020-08-22 23:03:16,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 494 states. [2020-08-22 23:03:16,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 494 to 494. [2020-08-22 23:03:16,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 494 states. [2020-08-22 23:03:16,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 494 states to 494 states and 519 transitions. [2020-08-22 23:03:16,425 INFO L78 Accepts]: Start accepts. Automaton has 494 states and 519 transitions. Word has length 311 [2020-08-22 23:03:16,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:03:16,426 INFO L479 AbstractCegarLoop]: Abstraction has 494 states and 519 transitions. [2020-08-22 23:03:16,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-22 23:03:16,426 INFO L276 IsEmpty]: Start isEmpty. Operand 494 states and 519 transitions. [2020-08-22 23:03:16,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 318 [2020-08-22 23:03:16,428 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:03:16,428 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:03:16,428 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-22 23:03:16,428 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:03:16,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:03:16,429 INFO L82 PathProgramCache]: Analyzing trace with hash -804667855, now seen corresponding path program 19 times [2020-08-22 23:03:16,429 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:03:16,429 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1126211631] [2020-08-22 23:03:16,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:03:16,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:03:17,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:03:17,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:03:17,367 INFO L134 CoverageAnalysis]: Checked inductivity of 945 backedges. 192 proven. 226 refuted. 0 times theorem prover too weak. 527 trivial. 0 not checked. [2020-08-22 23:03:17,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1126211631] [2020-08-22 23:03:17,368 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:03:17,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-22 23:03:17,368 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721879091] [2020-08-22 23:03:17,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-22 23:03:17,368 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:03:17,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-22 23:03:17,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=1261, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 23:03:17,369 INFO L87 Difference]: Start difference. First operand 494 states and 519 transitions. Second operand 39 states. [2020-08-22 23:03:20,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:03:20,421 INFO L93 Difference]: Finished difference Result 827 states and 878 transitions. [2020-08-22 23:03:20,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2020-08-22 23:03:20,422 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 317 [2020-08-22 23:03:20,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:03:20,425 INFO L225 Difference]: With dead ends: 827 [2020-08-22 23:03:20,425 INFO L226 Difference]: Without dead ends: 664 [2020-08-22 23:03:20,427 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2986 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2033, Invalid=8473, Unknown=0, NotChecked=0, Total=10506 [2020-08-22 23:03:20,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 664 states. [2020-08-22 23:03:20,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 664 to 500. [2020-08-22 23:03:20,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 500 states. [2020-08-22 23:03:20,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 500 states to 500 states and 525 transitions. [2020-08-22 23:03:20,553 INFO L78 Accepts]: Start accepts. Automaton has 500 states and 525 transitions. Word has length 317 [2020-08-22 23:03:20,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:03:20,553 INFO L479 AbstractCegarLoop]: Abstraction has 500 states and 525 transitions. [2020-08-22 23:03:20,554 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-22 23:03:20,554 INFO L276 IsEmpty]: Start isEmpty. Operand 500 states and 525 transitions. [2020-08-22 23:03:20,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 324 [2020-08-22 23:03:20,556 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:03:20,556 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:03:20,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-08-22 23:03:20,556 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:03:20,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:03:20,557 INFO L82 PathProgramCache]: Analyzing trace with hash -572895399, now seen corresponding path program 20 times [2020-08-22 23:03:20,557 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:03:20,557 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [368752119] [2020-08-22 23:03:20,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:03:20,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:03:21,616 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:03:21,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:03:21,690 INFO L134 CoverageAnalysis]: Checked inductivity of 995 backedges. 196 proven. 415 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2020-08-22 23:03:21,691 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [368752119] [2020-08-22 23:03:21,691 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:03:21,691 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-22 23:03:21,691 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286484706] [2020-08-22 23:03:21,691 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-22 23:03:21,691 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:03:21,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-22 23:03:21,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=1593, Unknown=0, NotChecked=0, Total=1806 [2020-08-22 23:03:21,692 INFO L87 Difference]: Start difference. First operand 500 states and 525 transitions. Second operand 43 states. [2020-08-22 23:03:25,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:03:25,457 INFO L93 Difference]: Finished difference Result 708 states and 747 transitions. [2020-08-22 23:03:25,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2020-08-22 23:03:25,459 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 323 [2020-08-22 23:03:25,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:03:25,462 INFO L225 Difference]: With dead ends: 708 [2020-08-22 23:03:25,463 INFO L226 Difference]: Without dead ends: 702 [2020-08-22 23:03:25,464 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2294 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1860, Invalid=8240, Unknown=0, NotChecked=0, Total=10100 [2020-08-22 23:03:25,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 702 states. [2020-08-22 23:03:25,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 702 to 665. [2020-08-22 23:03:25,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 665 states. [2020-08-22 23:03:25,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 665 states to 665 states and 704 transitions. [2020-08-22 23:03:25,656 INFO L78 Accepts]: Start accepts. Automaton has 665 states and 704 transitions. Word has length 323 [2020-08-22 23:03:25,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:03:25,656 INFO L479 AbstractCegarLoop]: Abstraction has 665 states and 704 transitions. [2020-08-22 23:03:25,656 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-22 23:03:25,656 INFO L276 IsEmpty]: Start isEmpty. Operand 665 states and 704 transitions. [2020-08-22 23:03:25,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 324 [2020-08-22 23:03:25,658 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:03:25,658 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:03:25,658 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-08-22 23:03:25,658 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:03:25,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:03:25,659 INFO L82 PathProgramCache]: Analyzing trace with hash -183348751, now seen corresponding path program 21 times [2020-08-22 23:03:25,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:03:25,659 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1543684823] [2020-08-22 23:03:25,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:03:25,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:03:26,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:03:26,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:03:26,719 INFO L134 CoverageAnalysis]: Checked inductivity of 996 backedges. 360 proven. 302 refuted. 0 times theorem prover too weak. 334 trivial. 0 not checked. [2020-08-22 23:03:26,719 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1543684823] [2020-08-22 23:03:26,720 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:03:26,720 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-22 23:03:26,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669394590] [2020-08-22 23:03:26,720 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-22 23:03:26,720 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:03:26,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-22 23:03:26,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=1439, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 23:03:26,721 INFO L87 Difference]: Start difference. First operand 665 states and 704 transitions. Second operand 41 states. [2020-08-22 23:03:32,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:03:32,175 INFO L93 Difference]: Finished difference Result 1317 states and 1399 transitions. [2020-08-22 23:03:32,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2020-08-22 23:03:32,178 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 323 [2020-08-22 23:03:32,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:03:32,183 INFO L225 Difference]: With dead ends: 1317 [2020-08-22 23:03:32,184 INFO L226 Difference]: Without dead ends: 1134 [2020-08-22 23:03:32,185 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5165 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=2496, Invalid=15060, Unknown=0, NotChecked=0, Total=17556 [2020-08-22 23:03:32,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1134 states. [2020-08-22 23:03:32,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1134 to 725. [2020-08-22 23:03:32,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 725 states. [2020-08-22 23:03:32,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 725 states to 725 states and 768 transitions. [2020-08-22 23:03:32,478 INFO L78 Accepts]: Start accepts. Automaton has 725 states and 768 transitions. Word has length 323 [2020-08-22 23:03:32,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:03:32,479 INFO L479 AbstractCegarLoop]: Abstraction has 725 states and 768 transitions. [2020-08-22 23:03:32,479 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-22 23:03:32,479 INFO L276 IsEmpty]: Start isEmpty. Operand 725 states and 768 transitions. [2020-08-22 23:03:32,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2020-08-22 23:03:32,481 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:03:32,481 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:03:32,481 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-08-22 23:03:32,481 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:03:32,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:03:32,482 INFO L82 PathProgramCache]: Analyzing trace with hash 1539443937, now seen corresponding path program 22 times [2020-08-22 23:03:32,482 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:03:32,482 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [743676573] [2020-08-22 23:03:32,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:03:32,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:03:33,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:03:33,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:03:33,599 INFO L134 CoverageAnalysis]: Checked inductivity of 1096 backedges. 445 proven. 267 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2020-08-22 23:03:33,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [743676573] [2020-08-22 23:03:33,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:03:33,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-22 23:03:33,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552689387] [2020-08-22 23:03:33,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-22 23:03:33,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:03:33,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-22 23:03:33,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=1413, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 23:03:33,600 INFO L87 Difference]: Start difference. First operand 725 states and 768 transitions. Second operand 41 states. [2020-08-22 23:03:40,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:03:40,349 INFO L93 Difference]: Finished difference Result 1857 states and 1978 transitions. [2020-08-22 23:03:40,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2020-08-22 23:03:40,350 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 335 [2020-08-22 23:03:40,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:03:40,358 INFO L225 Difference]: With dead ends: 1857 [2020-08-22 23:03:40,358 INFO L226 Difference]: Without dead ends: 1653 [2020-08-22 23:03:40,360 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6733 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=3253, Invalid=18503, Unknown=0, NotChecked=0, Total=21756 [2020-08-22 23:03:40,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1653 states. [2020-08-22 23:03:40,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1653 to 885. [2020-08-22 23:03:40,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 885 states. [2020-08-22 23:03:40,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 885 states to 885 states and 939 transitions. [2020-08-22 23:03:40,687 INFO L78 Accepts]: Start accepts. Automaton has 885 states and 939 transitions. Word has length 335 [2020-08-22 23:03:40,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:03:40,688 INFO L479 AbstractCegarLoop]: Abstraction has 885 states and 939 transitions. [2020-08-22 23:03:40,688 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-22 23:03:40,688 INFO L276 IsEmpty]: Start isEmpty. Operand 885 states and 939 transitions. [2020-08-22 23:03:40,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2020-08-22 23:03:40,690 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:03:40,690 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:03:40,690 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-08-22 23:03:40,690 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:03:40,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:03:40,690 INFO L82 PathProgramCache]: Analyzing trace with hash 1908833145, now seen corresponding path program 23 times [2020-08-22 23:03:40,691 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:03:40,691 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [162060652] [2020-08-22 23:03:40,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:03:40,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:03:41,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:03:41,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:03:41,952 INFO L134 CoverageAnalysis]: Checked inductivity of 1109 backedges. 372 proven. 398 refuted. 0 times theorem prover too weak. 339 trivial. 0 not checked. [2020-08-22 23:03:41,952 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [162060652] [2020-08-22 23:03:41,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:03:41,953 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-22 23:03:41,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731923244] [2020-08-22 23:03:41,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-22 23:03:41,954 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:03:41,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-22 23:03:41,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=1681, Unknown=0, NotChecked=0, Total=1892 [2020-08-22 23:03:41,955 INFO L87 Difference]: Start difference. First operand 885 states and 939 transitions. Second operand 44 states. [2020-08-22 23:03:49,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:03:49,817 INFO L93 Difference]: Finished difference Result 1754 states and 1866 transitions. [2020-08-22 23:03:49,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2020-08-22 23:03:49,818 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 335 [2020-08-22 23:03:49,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:03:49,822 INFO L225 Difference]: With dead ends: 1754 [2020-08-22 23:03:49,822 INFO L226 Difference]: Without dead ends: 544 [2020-08-22 23:03:49,824 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6862 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=3225, Invalid=19425, Unknown=0, NotChecked=0, Total=22650 [2020-08-22 23:03:49,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544 states. [2020-08-22 23:03:49,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544 to 544. [2020-08-22 23:03:49,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 544 states. [2020-08-22 23:03:49,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 544 states to 544 states and 572 transitions. [2020-08-22 23:03:49,970 INFO L78 Accepts]: Start accepts. Automaton has 544 states and 572 transitions. Word has length 335 [2020-08-22 23:03:49,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:03:49,971 INFO L479 AbstractCegarLoop]: Abstraction has 544 states and 572 transitions. [2020-08-22 23:03:49,971 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-22 23:03:49,971 INFO L276 IsEmpty]: Start isEmpty. Operand 544 states and 572 transitions. [2020-08-22 23:03:49,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 342 [2020-08-22 23:03:49,973 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:03:49,973 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:03:49,973 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-08-22 23:03:49,973 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:03:49,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:03:49,974 INFO L82 PathProgramCache]: Analyzing trace with hash -1365059927, now seen corresponding path program 24 times [2020-08-22 23:03:49,974 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:03:49,974 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1549697637] [2020-08-22 23:03:49,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:03:49,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:03:51,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:03:51,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:03:51,241 INFO L134 CoverageAnalysis]: Checked inductivity of 1152 backedges. 243 proven. 281 refuted. 0 times theorem prover too weak. 628 trivial. 0 not checked. [2020-08-22 23:03:51,241 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1549697637] [2020-08-22 23:03:51,245 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:03:51,246 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-22 23:03:51,246 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098017840] [2020-08-22 23:03:51,246 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-22 23:03:51,246 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:03:51,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-22 23:03:51,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=1541, Unknown=0, NotChecked=0, Total=1806 [2020-08-22 23:03:51,247 INFO L87 Difference]: Start difference. First operand 544 states and 572 transitions. Second operand 43 states. [2020-08-22 23:03:55,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:03:55,264 INFO L93 Difference]: Finished difference Result 901 states and 957 transitions. [2020-08-22 23:03:55,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2020-08-22 23:03:55,265 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 341 [2020-08-22 23:03:55,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:03:55,269 INFO L225 Difference]: With dead ends: 901 [2020-08-22 23:03:55,269 INFO L226 Difference]: Without dead ends: 726 [2020-08-22 23:03:55,270 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3795 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2533, Invalid=10577, Unknown=0, NotChecked=0, Total=13110 [2020-08-22 23:03:55,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 726 states. [2020-08-22 23:03:55,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 726 to 550. [2020-08-22 23:03:55,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 550 states. [2020-08-22 23:03:55,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 550 states to 550 states and 578 transitions. [2020-08-22 23:03:55,417 INFO L78 Accepts]: Start accepts. Automaton has 550 states and 578 transitions. Word has length 341 [2020-08-22 23:03:55,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:03:55,418 INFO L479 AbstractCegarLoop]: Abstraction has 550 states and 578 transitions. [2020-08-22 23:03:55,418 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-22 23:03:55,418 INFO L276 IsEmpty]: Start isEmpty. Operand 550 states and 578 transitions. [2020-08-22 23:03:55,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2020-08-22 23:03:55,419 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:03:55,420 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:03:55,420 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-08-22 23:03:55,420 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:03:55,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:03:55,420 INFO L82 PathProgramCache]: Analyzing trace with hash -53217327, now seen corresponding path program 25 times [2020-08-22 23:03:55,420 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:03:55,420 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2041215980] [2020-08-22 23:03:55,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:03:55,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:03:56,855 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:03:56,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:03:56,941 INFO L134 CoverageAnalysis]: Checked inductivity of 1208 backedges. 247 proven. 521 refuted. 0 times theorem prover too weak. 440 trivial. 0 not checked. [2020-08-22 23:03:56,942 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2041215980] [2020-08-22 23:03:56,942 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:03:56,942 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-22 23:03:56,942 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066397024] [2020-08-22 23:03:56,943 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-22 23:03:56,943 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:03:56,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-22 23:03:56,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=1907, Unknown=0, NotChecked=0, Total=2162 [2020-08-22 23:03:56,943 INFO L87 Difference]: Start difference. First operand 550 states and 578 transitions. Second operand 47 states. [2020-08-22 23:04:01,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:04:01,763 INFO L93 Difference]: Finished difference Result 774 states and 817 transitions. [2020-08-22 23:04:01,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2020-08-22 23:04:01,765 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 347 [2020-08-22 23:04:01,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:04:01,769 INFO L225 Difference]: With dead ends: 774 [2020-08-22 23:04:01,770 INFO L226 Difference]: Without dead ends: 768 [2020-08-22 23:04:01,771 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2805 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=2263, Invalid=9947, Unknown=0, NotChecked=0, Total=12210 [2020-08-22 23:04:01,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 768 states. [2020-08-22 23:04:02,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 768 to 727. [2020-08-22 23:04:02,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 727 states. [2020-08-22 23:04:02,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 727 states to 727 states and 770 transitions. [2020-08-22 23:04:02,010 INFO L78 Accepts]: Start accepts. Automaton has 727 states and 770 transitions. Word has length 347 [2020-08-22 23:04:02,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:04:02,010 INFO L479 AbstractCegarLoop]: Abstraction has 727 states and 770 transitions. [2020-08-22 23:04:02,010 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-22 23:04:02,011 INFO L276 IsEmpty]: Start isEmpty. Operand 727 states and 770 transitions. [2020-08-22 23:04:02,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2020-08-22 23:04:02,012 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:04:02,012 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:04:02,013 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-08-22 23:04:02,013 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:04:02,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:04:02,013 INFO L82 PathProgramCache]: Analyzing trace with hash -156414359, now seen corresponding path program 26 times [2020-08-22 23:04:02,013 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:04:02,013 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [663038480] [2020-08-22 23:04:02,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:04:02,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:04:03,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:04:03,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:04:03,505 INFO L134 CoverageAnalysis]: Checked inductivity of 1209 backedges. 457 proven. 368 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2020-08-22 23:04:03,506 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [663038480] [2020-08-22 23:04:03,506 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:04:03,506 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-22 23:04:03,506 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879060933] [2020-08-22 23:04:03,507 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-22 23:04:03,507 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:04:03,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-22 23:04:03,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=1739, Unknown=0, NotChecked=0, Total=1980 [2020-08-22 23:04:03,508 INFO L87 Difference]: Start difference. First operand 727 states and 770 transitions. Second operand 45 states. [2020-08-22 23:04:11,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:04:11,601 INFO L93 Difference]: Finished difference Result 1514 states and 1610 transitions. [2020-08-22 23:04:11,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2020-08-22 23:04:11,603 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 347 [2020-08-22 23:04:11,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:04:11,610 INFO L225 Difference]: With dead ends: 1514 [2020-08-22 23:04:11,610 INFO L226 Difference]: Without dead ends: 1310 [2020-08-22 23:04:11,612 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6581 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=3111, Invalid=18941, Unknown=0, NotChecked=0, Total=22052 [2020-08-22 23:04:11,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1310 states. [2020-08-22 23:04:11,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1310 to 799. [2020-08-22 23:04:11,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 799 states. [2020-08-22 23:04:11,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 799 states to 799 states and 847 transitions. [2020-08-22 23:04:11,955 INFO L78 Accepts]: Start accepts. Automaton has 799 states and 847 transitions. Word has length 347 [2020-08-22 23:04:11,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:04:11,956 INFO L479 AbstractCegarLoop]: Abstraction has 799 states and 847 transitions. [2020-08-22 23:04:11,956 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-22 23:04:11,956 INFO L276 IsEmpty]: Start isEmpty. Operand 799 states and 847 transitions. [2020-08-22 23:04:11,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 360 [2020-08-22 23:04:11,958 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:04:11,958 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:04:11,958 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-08-22 23:04:11,958 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:04:11,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:04:11,959 INFO L82 PathProgramCache]: Analyzing trace with hash -1762999975, now seen corresponding path program 27 times [2020-08-22 23:04:11,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:04:11,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [936024822] [2020-08-22 23:04:11,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:04:11,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:04:13,297 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:04:13,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:04:13,402 INFO L134 CoverageAnalysis]: Checked inductivity of 1321 backedges. 554 proven. 327 refuted. 0 times theorem prover too weak. 440 trivial. 0 not checked. [2020-08-22 23:04:13,403 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [936024822] [2020-08-22 23:04:13,403 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:04:13,403 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-22 23:04:13,403 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14799186] [2020-08-22 23:04:13,404 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-22 23:04:13,404 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:04:13,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-22 23:04:13,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=1709, Unknown=0, NotChecked=0, Total=1980 [2020-08-22 23:04:13,405 INFO L87 Difference]: Start difference. First operand 799 states and 847 transitions. Second operand 45 states. [2020-08-22 23:04:22,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:04:22,373 INFO L93 Difference]: Finished difference Result 2115 states and 2255 transitions. [2020-08-22 23:04:22,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2020-08-22 23:04:22,375 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 359 [2020-08-22 23:04:22,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:04:22,380 INFO L225 Difference]: With dead ends: 2115 [2020-08-22 23:04:22,381 INFO L226 Difference]: Without dead ends: 1890 [2020-08-22 23:04:22,383 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8561 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=4083, Invalid=23307, Unknown=0, NotChecked=0, Total=27390 [2020-08-22 23:04:22,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1890 states. [2020-08-22 23:04:22,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1890 to 985. [2020-08-22 23:04:22,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 985 states. [2020-08-22 23:04:22,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 985 states to 985 states and 1046 transitions. [2020-08-22 23:04:22,798 INFO L78 Accepts]: Start accepts. Automaton has 985 states and 1046 transitions. Word has length 359 [2020-08-22 23:04:22,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:04:22,798 INFO L479 AbstractCegarLoop]: Abstraction has 985 states and 1046 transitions. [2020-08-22 23:04:22,799 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-22 23:04:22,799 INFO L276 IsEmpty]: Start isEmpty. Operand 985 states and 1046 transitions. [2020-08-22 23:04:22,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 360 [2020-08-22 23:04:22,801 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:04:22,802 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:04:22,804 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-08-22 23:04:22,804 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:04:22,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:04:22,804 INFO L82 PathProgramCache]: Analyzing trace with hash -2091219983, now seen corresponding path program 28 times [2020-08-22 23:04:22,804 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:04:22,804 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [794195189] [2020-08-22 23:04:22,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:04:22,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:04:24,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:04:24,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:04:24,489 INFO L134 CoverageAnalysis]: Checked inductivity of 1334 backedges. 469 proven. 476 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2020-08-22 23:04:24,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [794195189] [2020-08-22 23:04:24,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:04:24,489 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-22 23:04:24,490 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272629526] [2020-08-22 23:04:24,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-22 23:04:24,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:04:24,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-22 23:04:24,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=2005, Unknown=0, NotChecked=0, Total=2256 [2020-08-22 23:04:24,491 INFO L87 Difference]: Start difference. First operand 985 states and 1046 transitions. Second operand 48 states. [2020-08-22 23:04:35,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:04:35,309 INFO L93 Difference]: Finished difference Result 2036 states and 2169 transitions. [2020-08-22 23:04:35,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2020-08-22 23:04:35,311 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 359 [2020-08-22 23:04:35,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:04:35,314 INFO L225 Difference]: With dead ends: 2036 [2020-08-22 23:04:35,314 INFO L226 Difference]: Without dead ends: 594 [2020-08-22 23:04:35,318 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8731 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=3994, Invalid=24398, Unknown=0, NotChecked=0, Total=28392 [2020-08-22 23:04:35,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 594 states. [2020-08-22 23:04:35,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 594 to 594. [2020-08-22 23:04:35,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 594 states. [2020-08-22 23:04:35,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 594 states to 594 states and 625 transitions. [2020-08-22 23:04:35,538 INFO L78 Accepts]: Start accepts. Automaton has 594 states and 625 transitions. Word has length 359 [2020-08-22 23:04:35,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:04:35,538 INFO L479 AbstractCegarLoop]: Abstraction has 594 states and 625 transitions. [2020-08-22 23:04:35,538 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-22 23:04:35,538 INFO L276 IsEmpty]: Start isEmpty. Operand 594 states and 625 transitions. [2020-08-22 23:04:35,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2020-08-22 23:04:35,540 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:04:35,540 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:04:35,540 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2020-08-22 23:04:35,541 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:04:35,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:04:35,541 INFO L82 PathProgramCache]: Analyzing trace with hash 2080158497, now seen corresponding path program 29 times [2020-08-22 23:04:35,541 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:04:35,541 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [984983104] [2020-08-22 23:04:35,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:04:35,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:04:37,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:04:37,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:04:37,205 INFO L134 CoverageAnalysis]: Checked inductivity of 1383 backedges. 300 proven. 342 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2020-08-22 23:04:37,206 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [984983104] [2020-08-22 23:04:37,206 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:04:37,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-22 23:04:37,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974538842] [2020-08-22 23:04:37,206 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-22 23:04:37,207 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:04:37,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-22 23:04:37,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=1849, Unknown=0, NotChecked=0, Total=2162 [2020-08-22 23:04:37,207 INFO L87 Difference]: Start difference. First operand 594 states and 625 transitions. Second operand 47 states. [2020-08-22 23:04:42,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:04:42,285 INFO L93 Difference]: Finished difference Result 975 states and 1036 transitions. [2020-08-22 23:04:42,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-08-22 23:04:42,286 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 365 [2020-08-22 23:04:42,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:04:42,288 INFO L225 Difference]: With dead ends: 975 [2020-08-22 23:04:42,288 INFO L226 Difference]: Without dead ends: 788 [2020-08-22 23:04:42,289 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4701 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=3088, Invalid=12914, Unknown=0, NotChecked=0, Total=16002 [2020-08-22 23:04:42,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 788 states. [2020-08-22 23:04:42,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 788 to 600. [2020-08-22 23:04:42,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 600 states. [2020-08-22 23:04:42,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 600 states to 600 states and 631 transitions. [2020-08-22 23:04:42,486 INFO L78 Accepts]: Start accepts. Automaton has 600 states and 631 transitions. Word has length 365 [2020-08-22 23:04:42,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:04:42,486 INFO L479 AbstractCegarLoop]: Abstraction has 600 states and 631 transitions. [2020-08-22 23:04:42,486 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-22 23:04:42,486 INFO L276 IsEmpty]: Start isEmpty. Operand 600 states and 631 transitions. [2020-08-22 23:04:42,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 372 [2020-08-22 23:04:42,488 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:04:42,488 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:04:42,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2020-08-22 23:04:42,488 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:04:42,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:04:42,489 INFO L82 PathProgramCache]: Analyzing trace with hash 1510761545, now seen corresponding path program 30 times [2020-08-22 23:04:42,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:04:42,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1643542595] [2020-08-22 23:04:42,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:04:42,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:04:44,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:04:44,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:04:44,444 INFO L134 CoverageAnalysis]: Checked inductivity of 1445 backedges. 304 proven. 639 refuted. 0 times theorem prover too weak. 502 trivial. 0 not checked. [2020-08-22 23:04:44,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1643542595] [2020-08-22 23:04:44,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:04:44,444 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-08-22 23:04:44,444 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993778253] [2020-08-22 23:04:44,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-08-22 23:04:44,445 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:04:44,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-08-22 23:04:44,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=2249, Unknown=0, NotChecked=0, Total=2550 [2020-08-22 23:04:44,445 INFO L87 Difference]: Start difference. First operand 600 states and 631 transitions. Second operand 51 states. [2020-08-22 23:04:50,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:04:50,840 INFO L93 Difference]: Finished difference Result 840 states and 887 transitions. [2020-08-22 23:04:50,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2020-08-22 23:04:50,842 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 371 [2020-08-22 23:04:50,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:04:50,844 INFO L225 Difference]: With dead ends: 840 [2020-08-22 23:04:50,844 INFO L226 Difference]: Without dead ends: 834 [2020-08-22 23:04:50,845 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3367 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=2706, Invalid=11814, Unknown=0, NotChecked=0, Total=14520 [2020-08-22 23:04:50,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 834 states. [2020-08-22 23:04:51,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 834 to 789. [2020-08-22 23:04:51,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 789 states. [2020-08-22 23:04:51,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 789 states to 789 states and 836 transitions. [2020-08-22 23:04:51,138 INFO L78 Accepts]: Start accepts. Automaton has 789 states and 836 transitions. Word has length 371 [2020-08-22 23:04:51,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:04:51,138 INFO L479 AbstractCegarLoop]: Abstraction has 789 states and 836 transitions. [2020-08-22 23:04:51,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-08-22 23:04:51,138 INFO L276 IsEmpty]: Start isEmpty. Operand 789 states and 836 transitions. [2020-08-22 23:04:51,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 372 [2020-08-22 23:04:51,140 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:04:51,140 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:04:51,140 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2020-08-22 23:04:51,140 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:04:51,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:04:51,141 INFO L82 PathProgramCache]: Analyzing trace with hash 117116641, now seen corresponding path program 31 times [2020-08-22 23:04:51,141 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:04:51,141 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [788838044] [2020-08-22 23:04:51,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:04:51,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:04:53,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:04:53,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:04:53,204 INFO L134 CoverageAnalysis]: Checked inductivity of 1446 backedges. 566 proven. 440 refuted. 0 times theorem prover too weak. 440 trivial. 0 not checked. [2020-08-22 23:04:53,204 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [788838044] [2020-08-22 23:04:53,204 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:04:53,204 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-22 23:04:53,204 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77767091] [2020-08-22 23:04:53,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-22 23:04:53,205 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:04:53,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-22 23:04:53,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=2067, Unknown=0, NotChecked=0, Total=2352 [2020-08-22 23:04:53,205 INFO L87 Difference]: Start difference. First operand 789 states and 836 transitions. Second operand 49 states. [2020-08-22 23:05:03,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:05:03,960 INFO L93 Difference]: Finished difference Result 1723 states and 1834 transitions. [2020-08-22 23:05:03,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2020-08-22 23:05:03,961 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 371 [2020-08-22 23:05:03,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:05:03,964 INFO L225 Difference]: With dead ends: 1723 [2020-08-22 23:05:03,964 INFO L226 Difference]: Without dead ends: 1498 [2020-08-22 23:05:03,966 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8169 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=3794, Invalid=23266, Unknown=0, NotChecked=0, Total=27060 [2020-08-22 23:05:03,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1498 states. [2020-08-22 23:05:04,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1498 to 873. [2020-08-22 23:05:04,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 873 states. [2020-08-22 23:05:04,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 873 states to 873 states and 926 transitions. [2020-08-22 23:05:04,418 INFO L78 Accepts]: Start accepts. Automaton has 873 states and 926 transitions. Word has length 371 [2020-08-22 23:05:04,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:05:04,419 INFO L479 AbstractCegarLoop]: Abstraction has 873 states and 926 transitions. [2020-08-22 23:05:04,419 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-22 23:05:04,419 INFO L276 IsEmpty]: Start isEmpty. Operand 873 states and 926 transitions. [2020-08-22 23:05:04,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 384 [2020-08-22 23:05:04,421 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:05:04,421 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:05:04,421 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2020-08-22 23:05:04,421 INFO L427 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:05:04,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:05:04,421 INFO L82 PathProgramCache]: Analyzing trace with hash -196331055, now seen corresponding path program 32 times [2020-08-22 23:05:04,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:05:04,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [89273134] [2020-08-22 23:05:04,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:05:04,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:05:06,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:05:06,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:05:06,209 INFO L134 CoverageAnalysis]: Checked inductivity of 1570 backedges. 675 proven. 393 refuted. 0 times theorem prover too weak. 502 trivial. 0 not checked. [2020-08-22 23:05:06,210 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [89273134] [2020-08-22 23:05:06,210 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:05:06,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-22 23:05:06,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773733993] [2020-08-22 23:05:06,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-22 23:05:06,210 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:05:06,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-22 23:05:06,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=2033, Unknown=0, NotChecked=0, Total=2352 [2020-08-22 23:05:06,211 INFO L87 Difference]: Start difference. First operand 873 states and 926 transitions. Second operand 49 states. [2020-08-22 23:05:17,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:05:17,763 INFO L93 Difference]: Finished difference Result 2385 states and 2545 transitions. [2020-08-22 23:05:17,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 152 states. [2020-08-22 23:05:17,765 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 383 [2020-08-22 23:05:17,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:05:17,770 INFO L225 Difference]: With dead ends: 2385 [2020-08-22 23:05:17,770 INFO L226 Difference]: Without dead ends: 2139 [2020-08-22 23:05:17,772 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10605 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=5008, Invalid=28664, Unknown=0, NotChecked=0, Total=33672 [2020-08-22 23:05:17,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2139 states. [2020-08-22 23:05:18,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2139 to 1085. [2020-08-22 23:05:18,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1085 states. [2020-08-22 23:05:18,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1085 states to 1085 states and 1153 transitions. [2020-08-22 23:05:18,398 INFO L78 Accepts]: Start accepts. Automaton has 1085 states and 1153 transitions. Word has length 383 [2020-08-22 23:05:18,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:05:18,399 INFO L479 AbstractCegarLoop]: Abstraction has 1085 states and 1153 transitions. [2020-08-22 23:05:18,399 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-22 23:05:18,399 INFO L276 IsEmpty]: Start isEmpty. Operand 1085 states and 1153 transitions. [2020-08-22 23:05:18,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 384 [2020-08-22 23:05:18,401 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:05:18,401 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:05:18,402 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2020-08-22 23:05:18,402 INFO L427 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:05:18,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:05:18,402 INFO L82 PathProgramCache]: Analyzing trace with hash -40152983, now seen corresponding path program 33 times [2020-08-22 23:05:18,402 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:05:18,402 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [386839861] [2020-08-22 23:05:18,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:05:18,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:05:20,268 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:05:20,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:05:20,376 INFO L134 CoverageAnalysis]: Checked inductivity of 1583 backedges. 578 proven. 560 refuted. 0 times theorem prover too weak. 445 trivial. 0 not checked. [2020-08-22 23:05:20,376 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [386839861] [2020-08-22 23:05:20,377 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:05:20,377 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2020-08-22 23:05:20,377 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353880363] [2020-08-22 23:05:20,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-08-22 23:05:20,377 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:05:20,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-08-22 23:05:20,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=295, Invalid=2357, Unknown=0, NotChecked=0, Total=2652 [2020-08-22 23:05:20,378 INFO L87 Difference]: Start difference. First operand 1085 states and 1153 transitions. Second operand 52 states. [2020-08-22 23:05:33,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:05:33,635 INFO L93 Difference]: Finished difference Result 2330 states and 2485 transitions. [2020-08-22 23:05:33,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2020-08-22 23:05:33,637 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 383 [2020-08-22 23:05:33,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:05:33,639 INFO L225 Difference]: With dead ends: 2330 [2020-08-22 23:05:33,639 INFO L226 Difference]: Without dead ends: 644 [2020-08-22 23:05:33,644 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10826 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=4844, Invalid=29938, Unknown=0, NotChecked=0, Total=34782 [2020-08-22 23:05:33,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 644 states. [2020-08-22 23:05:33,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 644 to 644. [2020-08-22 23:05:33,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 644 states. [2020-08-22 23:05:33,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 644 states to 644 states and 678 transitions. [2020-08-22 23:05:33,972 INFO L78 Accepts]: Start accepts. Automaton has 644 states and 678 transitions. Word has length 383 [2020-08-22 23:05:33,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:05:33,972 INFO L479 AbstractCegarLoop]: Abstraction has 644 states and 678 transitions. [2020-08-22 23:05:33,972 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-08-22 23:05:33,972 INFO L276 IsEmpty]: Start isEmpty. Operand 644 states and 678 transitions. [2020-08-22 23:05:33,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2020-08-22 23:05:33,974 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:05:33,974 INFO L422 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:05:33,975 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2020-08-22 23:05:33,975 INFO L427 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:05:33,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:05:33,975 INFO L82 PathProgramCache]: Analyzing trace with hash -1265151079, now seen corresponding path program 34 times [2020-08-22 23:05:33,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:05:33,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1896651515] [2020-08-22 23:05:33,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:05:33,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:05:36,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:05:36,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:05:36,173 INFO L134 CoverageAnalysis]: Checked inductivity of 1638 backedges. 363 proven. 409 refuted. 0 times theorem prover too weak. 866 trivial. 0 not checked. [2020-08-22 23:05:36,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1896651515] [2020-08-22 23:05:36,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:05:36,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-08-22 23:05:36,174 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735438118] [2020-08-22 23:05:36,175 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-08-22 23:05:36,175 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:05:36,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-08-22 23:05:36,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=365, Invalid=2185, Unknown=0, NotChecked=0, Total=2550 [2020-08-22 23:05:36,176 INFO L87 Difference]: Start difference. First operand 644 states and 678 transitions. Second operand 51 states. [2020-08-22 23:05:42,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:05:42,091 INFO L93 Difference]: Finished difference Result 1049 states and 1115 transitions. [2020-08-22 23:05:42,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2020-08-22 23:05:42,093 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 389 [2020-08-22 23:05:42,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:05:42,096 INFO L225 Difference]: With dead ends: 1049 [2020-08-22 23:05:42,096 INFO L226 Difference]: Without dead ends: 850 [2020-08-22 23:05:42,097 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5704 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=3698, Invalid=15484, Unknown=0, NotChecked=0, Total=19182 [2020-08-22 23:05:42,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 850 states. [2020-08-22 23:05:42,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 850 to 650. [2020-08-22 23:05:42,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 650 states. [2020-08-22 23:05:42,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 650 states to 650 states and 684 transitions. [2020-08-22 23:05:42,358 INFO L78 Accepts]: Start accepts. Automaton has 650 states and 684 transitions. Word has length 389 [2020-08-22 23:05:42,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:05:42,359 INFO L479 AbstractCegarLoop]: Abstraction has 650 states and 684 transitions. [2020-08-22 23:05:42,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-08-22 23:05:42,359 INFO L276 IsEmpty]: Start isEmpty. Operand 650 states and 684 transitions. [2020-08-22 23:05:42,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 396 [2020-08-22 23:05:42,361 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:05:42,361 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:05:42,361 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63 [2020-08-22 23:05:42,361 INFO L427 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:05:42,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:05:42,362 INFO L82 PathProgramCache]: Analyzing trace with hash -394029887, now seen corresponding path program 35 times [2020-08-22 23:05:42,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:05:42,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1804576492] [2020-08-22 23:05:42,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:05:42,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:05:44,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:05:44,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:05:44,594 INFO L134 CoverageAnalysis]: Checked inductivity of 1706 backedges. 367 proven. 769 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2020-08-22 23:05:44,594 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1804576492] [2020-08-22 23:05:44,594 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:05:44,595 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-08-22 23:05:44,595 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452646272] [2020-08-22 23:05:44,595 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-08-22 23:05:44,595 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:05:44,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-08-22 23:05:44,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=2619, Unknown=0, NotChecked=0, Total=2970 [2020-08-22 23:05:44,596 INFO L87 Difference]: Start difference. First operand 650 states and 684 transitions. Second operand 55 states. [2020-08-22 23:05:52,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:05:52,145 INFO L93 Difference]: Finished difference Result 906 states and 957 transitions. [2020-08-22 23:05:52,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2020-08-22 23:05:52,147 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 395 [2020-08-22 23:05:52,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:05:52,149 INFO L225 Difference]: With dead ends: 906 [2020-08-22 23:05:52,150 INFO L226 Difference]: Without dead ends: 900 [2020-08-22 23:05:52,151 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3980 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=3189, Invalid=13841, Unknown=0, NotChecked=0, Total=17030 [2020-08-22 23:05:52,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 900 states. [2020-08-22 23:05:52,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 900 to 851. [2020-08-22 23:05:52,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 851 states. [2020-08-22 23:05:52,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 851 states to 851 states and 902 transitions. [2020-08-22 23:05:52,568 INFO L78 Accepts]: Start accepts. Automaton has 851 states and 902 transitions. Word has length 395 [2020-08-22 23:05:52,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:05:52,569 INFO L479 AbstractCegarLoop]: Abstraction has 851 states and 902 transitions. [2020-08-22 23:05:52,569 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-08-22 23:05:52,569 INFO L276 IsEmpty]: Start isEmpty. Operand 851 states and 902 transitions. [2020-08-22 23:05:52,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 396 [2020-08-22 23:05:52,571 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:05:52,571 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:05:52,571 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2020-08-22 23:05:52,572 INFO L427 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:05:52,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:05:52,572 INFO L82 PathProgramCache]: Analyzing trace with hash 2054919001, now seen corresponding path program 36 times [2020-08-22 23:05:52,572 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:05:52,572 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [305898833] [2020-08-22 23:05:52,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:05:52,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:05:54,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:05:54,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:05:55,005 INFO L134 CoverageAnalysis]: Checked inductivity of 1707 backedges. 687 proven. 518 refuted. 0 times theorem prover too weak. 502 trivial. 0 not checked. [2020-08-22 23:05:55,005 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [305898833] [2020-08-22 23:05:55,005 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:05:55,005 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-08-22 23:05:55,005 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80960307] [2020-08-22 23:05:55,006 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-08-22 23:05:55,006 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:05:55,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-08-22 23:05:55,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=333, Invalid=2423, Unknown=0, NotChecked=0, Total=2756 [2020-08-22 23:05:55,007 INFO L87 Difference]: Start difference. First operand 851 states and 902 transitions. Second operand 53 states. [2020-08-22 23:06:08,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:06:08,626 INFO L93 Difference]: Finished difference Result 1944 states and 2071 transitions. [2020-08-22 23:06:08,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 145 states. [2020-08-22 23:06:08,628 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 395 [2020-08-22 23:06:08,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:06:08,634 INFO L225 Difference]: With dead ends: 1944 [2020-08-22 23:06:08,634 INFO L226 Difference]: Without dead ends: 1698 [2020-08-22 23:06:08,637 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9929 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=4545, Invalid=28035, Unknown=0, NotChecked=0, Total=32580 [2020-08-22 23:06:08,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1698 states. [2020-08-22 23:06:09,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1698 to 947. [2020-08-22 23:06:09,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 947 states. [2020-08-22 23:06:09,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 947 states to 947 states and 1005 transitions. [2020-08-22 23:06:09,228 INFO L78 Accepts]: Start accepts. Automaton has 947 states and 1005 transitions. Word has length 395 [2020-08-22 23:06:09,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:06:09,228 INFO L479 AbstractCegarLoop]: Abstraction has 947 states and 1005 transitions. [2020-08-22 23:06:09,228 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-08-22 23:06:09,228 INFO L276 IsEmpty]: Start isEmpty. Operand 947 states and 1005 transitions. [2020-08-22 23:06:09,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2020-08-22 23:06:09,230 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:06:09,230 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:06:09,231 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2020-08-22 23:06:09,231 INFO L427 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:06:09,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:06:09,231 INFO L82 PathProgramCache]: Analyzing trace with hash -421104055, now seen corresponding path program 37 times [2020-08-22 23:06:09,231 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:06:09,231 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [336625072] [2020-08-22 23:06:09,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:06:09,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:06:11,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:06:11,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:06:11,557 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 808 proven. 465 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2020-08-22 23:06:11,558 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [336625072] [2020-08-22 23:06:11,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:06:11,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-08-22 23:06:11,558 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1878717913] [2020-08-22 23:06:11,558 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-08-22 23:06:11,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:06:11,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-08-22 23:06:11,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=371, Invalid=2385, Unknown=0, NotChecked=0, Total=2756 [2020-08-22 23:06:11,559 INFO L87 Difference]: Start difference. First operand 947 states and 1005 transitions. Second operand 53 states. [2020-08-22 23:06:26,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:06:26,186 INFO L93 Difference]: Finished difference Result 2667 states and 2848 transitions. [2020-08-22 23:06:26,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 167 states. [2020-08-22 23:06:26,188 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 407 [2020-08-22 23:06:26,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:06:26,191 INFO L225 Difference]: With dead ends: 2667 [2020-08-22 23:06:26,192 INFO L226 Difference]: Without dead ends: 2400 [2020-08-22 23:06:26,194 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12865 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=6028, Invalid=34574, Unknown=0, NotChecked=0, Total=40602 [2020-08-22 23:06:26,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2400 states. [2020-08-22 23:06:26,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2400 to 1185. [2020-08-22 23:06:26,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1185 states. [2020-08-22 23:06:26,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1185 states to 1185 states and 1260 transitions. [2020-08-22 23:06:26,795 INFO L78 Accepts]: Start accepts. Automaton has 1185 states and 1260 transitions. Word has length 407 [2020-08-22 23:06:26,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:06:26,795 INFO L479 AbstractCegarLoop]: Abstraction has 1185 states and 1260 transitions. [2020-08-22 23:06:26,795 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-08-22 23:06:26,795 INFO L276 IsEmpty]: Start isEmpty. Operand 1185 states and 1260 transitions. [2020-08-22 23:06:26,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2020-08-22 23:06:26,798 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:06:26,798 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 12, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:06:26,798 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66 [2020-08-22 23:06:26,798 INFO L427 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:06:26,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:06:26,798 INFO L82 PathProgramCache]: Analyzing trace with hash 1963516129, now seen corresponding path program 38 times [2020-08-22 23:06:26,798 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:06:26,799 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [388962385] [2020-08-22 23:06:26,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:06:26,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:06:29,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:06:29,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:06:29,657 INFO L134 CoverageAnalysis]: Checked inductivity of 1856 backedges. 699 proven. 650 refuted. 0 times theorem prover too weak. 507 trivial. 0 not checked. [2020-08-22 23:06:29,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [388962385] [2020-08-22 23:06:29,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:06:29,657 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2020-08-22 23:06:29,658 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293428684] [2020-08-22 23:06:29,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-08-22 23:06:29,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:06:29,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-08-22 23:06:29,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=343, Invalid=2737, Unknown=0, NotChecked=0, Total=3080 [2020-08-22 23:06:29,659 INFO L87 Difference]: Start difference. First operand 1185 states and 1260 transitions. Second operand 56 states. [2020-08-22 23:06:46,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:06:46,730 INFO L93 Difference]: Finished difference Result 2636 states and 2814 transitions. [2020-08-22 23:06:46,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 166 states. [2020-08-22 23:06:46,732 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 407 [2020-08-22 23:06:46,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:06:46,733 INFO L225 Difference]: With dead ends: 2636 [2020-08-22 23:06:46,733 INFO L226 Difference]: Without dead ends: 694 [2020-08-22 23:06:46,738 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13147 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=5775, Invalid=36045, Unknown=0, NotChecked=0, Total=41820 [2020-08-22 23:06:46,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 694 states. [2020-08-22 23:06:47,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 694 to 694. [2020-08-22 23:06:47,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 694 states. [2020-08-22 23:06:47,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 694 states to 694 states and 731 transitions. [2020-08-22 23:06:47,001 INFO L78 Accepts]: Start accepts. Automaton has 694 states and 731 transitions. Word has length 407 [2020-08-22 23:06:47,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:06:47,001 INFO L479 AbstractCegarLoop]: Abstraction has 694 states and 731 transitions. [2020-08-22 23:06:47,002 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-08-22 23:06:47,002 INFO L276 IsEmpty]: Start isEmpty. Operand 694 states and 731 transitions. [2020-08-22 23:06:47,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 414 [2020-08-22 23:06:47,003 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:06:47,004 INFO L422 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:06:47,004 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67 [2020-08-22 23:06:47,004 INFO L427 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:06:47,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:06:47,004 INFO L82 PathProgramCache]: Analyzing trace with hash 863156241, now seen corresponding path program 39 times [2020-08-22 23:06:47,004 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:06:47,004 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1688448552] [2020-08-22 23:06:47,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:06:47,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:06:49,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:06:49,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:06:49,747 INFO L134 CoverageAnalysis]: Checked inductivity of 1917 backedges. 432 proven. 482 refuted. 0 times theorem prover too weak. 1003 trivial. 0 not checked. [2020-08-22 23:06:49,747 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1688448552] [2020-08-22 23:06:49,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:06:49,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-08-22 23:06:49,748 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91725494] [2020-08-22 23:06:49,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-08-22 23:06:49,748 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:06:49,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-08-22 23:06:49,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=421, Invalid=2549, Unknown=0, NotChecked=0, Total=2970 [2020-08-22 23:06:49,749 INFO L87 Difference]: Start difference. First operand 694 states and 731 transitions. Second operand 55 states. [2020-08-22 23:06:57,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:06:57,798 INFO L93 Difference]: Finished difference Result 1123 states and 1194 transitions. [2020-08-22 23:06:57,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2020-08-22 23:06:57,800 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 413 [2020-08-22 23:06:57,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:06:57,801 INFO L225 Difference]: With dead ends: 1123 [2020-08-22 23:06:57,801 INFO L226 Difference]: Without dead ends: 912 [2020-08-22 23:06:57,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6804 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=4363, Invalid=18287, Unknown=0, NotChecked=0, Total=22650 [2020-08-22 23:06:57,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 912 states. [2020-08-22 23:06:58,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 912 to 700. [2020-08-22 23:06:58,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 700 states. [2020-08-22 23:06:58,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 700 states to 700 states and 737 transitions. [2020-08-22 23:06:58,076 INFO L78 Accepts]: Start accepts. Automaton has 700 states and 737 transitions. Word has length 413 [2020-08-22 23:06:58,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:06:58,076 INFO L479 AbstractCegarLoop]: Abstraction has 700 states and 737 transitions. [2020-08-22 23:06:58,076 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-08-22 23:06:58,076 INFO L276 IsEmpty]: Start isEmpty. Operand 700 states and 737 transitions. [2020-08-22 23:06:58,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 420 [2020-08-22 23:06:58,078 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:06:58,078 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:06:58,078 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2020-08-22 23:06:58,078 INFO L427 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:06:58,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:06:58,079 INFO L82 PathProgramCache]: Analyzing trace with hash 1505331513, now seen corresponding path program 40 times [2020-08-22 23:06:58,079 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:06:58,079 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1805605877] [2020-08-22 23:06:58,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:06:58,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:07:01,044 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:07:01,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:07:01,159 INFO L134 CoverageAnalysis]: Checked inductivity of 1991 backedges. 436 proven. 911 refuted. 0 times theorem prover too weak. 644 trivial. 0 not checked. [2020-08-22 23:07:01,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1805605877] [2020-08-22 23:07:01,160 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:07:01,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2020-08-22 23:07:01,160 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535468314] [2020-08-22 23:07:01,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-08-22 23:07:01,161 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:07:01,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-08-22 23:07:01,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=427, Invalid=2879, Unknown=0, NotChecked=0, Total=3306 [2020-08-22 23:07:01,161 INFO L87 Difference]: Start difference. First operand 700 states and 737 transitions. Second operand 58 states. [2020-08-22 23:07:15,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:07:15,115 INFO L93 Difference]: Finished difference Result 2265 states and 2409 transitions. [2020-08-22 23:07:15,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2020-08-22 23:07:15,118 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 419 [2020-08-22 23:07:15,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:07:15,120 INFO L225 Difference]: With dead ends: 2265 [2020-08-22 23:07:15,121 INFO L226 Difference]: Without dead ends: 2259 [2020-08-22 23:07:15,122 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8068 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=5776, Invalid=23294, Unknown=0, NotChecked=0, Total=29070 [2020-08-22 23:07:15,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2259 states. [2020-08-22 23:07:15,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2259 to 1075. [2020-08-22 23:07:15,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1075 states. [2020-08-22 23:07:15,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1075 states to 1075 states and 1146 transitions. [2020-08-22 23:07:15,636 INFO L78 Accepts]: Start accepts. Automaton has 1075 states and 1146 transitions. Word has length 419 [2020-08-22 23:07:15,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:07:15,636 INFO L479 AbstractCegarLoop]: Abstraction has 1075 states and 1146 transitions. [2020-08-22 23:07:15,636 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-08-22 23:07:15,637 INFO L276 IsEmpty]: Start isEmpty. Operand 1075 states and 1146 transitions. [2020-08-22 23:07:15,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 420 [2020-08-22 23:07:15,639 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:07:15,639 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:07:15,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69 [2020-08-22 23:07:15,639 INFO L427 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:07:15,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:07:15,640 INFO L82 PathProgramCache]: Analyzing trace with hash 1143921617, now seen corresponding path program 41 times [2020-08-22 23:07:15,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:07:15,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [813775904] [2020-08-22 23:07:15,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:07:15,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:07:18,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:07:18,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:07:18,847 INFO L134 CoverageAnalysis]: Checked inductivity of 1992 backedges. 820 proven. 602 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2020-08-22 23:07:18,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [813775904] [2020-08-22 23:07:18,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:07:18,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-08-22 23:07:18,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270467729] [2020-08-22 23:07:18,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-08-22 23:07:18,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:07:18,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-08-22 23:07:18,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=385, Invalid=2807, Unknown=0, NotChecked=0, Total=3192 [2020-08-22 23:07:18,849 INFO L87 Difference]: Start difference. First operand 1075 states and 1146 transitions. Second operand 57 states. [2020-08-22 23:07:38,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:07:38,255 INFO L93 Difference]: Finished difference Result 3817 states and 4086 transitions. [2020-08-22 23:07:38,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 158 states. [2020-08-22 23:07:38,258 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 419 [2020-08-22 23:07:38,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:07:38,262 INFO L225 Difference]: With dead ends: 3817 [2020-08-22 23:07:38,262 INFO L226 Difference]: Without dead ends: 3277 [2020-08-22 23:07:38,265 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11861 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=5364, Invalid=33248, Unknown=0, NotChecked=0, Total=38612 [2020-08-22 23:07:38,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3277 states. [2020-08-22 23:07:39,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3277 to 1291. [2020-08-22 23:07:39,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1291 states. [2020-08-22 23:07:39,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1291 states to 1291 states and 1378 transitions. [2020-08-22 23:07:39,116 INFO L78 Accepts]: Start accepts. Automaton has 1291 states and 1378 transitions. Word has length 419 [2020-08-22 23:07:39,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:07:39,116 INFO L479 AbstractCegarLoop]: Abstraction has 1291 states and 1378 transitions. [2020-08-22 23:07:39,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-08-22 23:07:39,117 INFO L276 IsEmpty]: Start isEmpty. Operand 1291 states and 1378 transitions. [2020-08-22 23:07:39,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 432 [2020-08-22 23:07:39,119 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:07:39,119 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:07:39,119 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70 [2020-08-22 23:07:39,120 INFO L427 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:07:39,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:07:39,120 INFO L82 PathProgramCache]: Analyzing trace with hash -533104959, now seen corresponding path program 42 times [2020-08-22 23:07:39,120 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:07:39,120 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [746503779] [2020-08-22 23:07:39,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:07:39,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:07:42,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:07:42,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:07:42,405 INFO L134 CoverageAnalysis]: Checked inductivity of 2140 backedges. 953 proven. 543 refuted. 0 times theorem prover too weak. 644 trivial. 0 not checked. [2020-08-22 23:07:42,405 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [746503779] [2020-08-22 23:07:42,406 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:07:42,406 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-08-22 23:07:42,406 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194280995] [2020-08-22 23:07:42,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-08-22 23:07:42,406 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:07:42,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-08-22 23:07:42,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=427, Invalid=2765, Unknown=0, NotChecked=0, Total=3192 [2020-08-22 23:07:42,407 INFO L87 Difference]: Start difference. First operand 1291 states and 1378 transitions. Second operand 57 states. [2020-08-22 23:08:03,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:08:03,234 INFO L93 Difference]: Finished difference Result 3867 states and 4141 transitions. [2020-08-22 23:08:03,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 182 states. [2020-08-22 23:08:03,238 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 431 [2020-08-22 23:08:03,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:08:03,242 INFO L225 Difference]: With dead ends: 3867 [2020-08-22 23:08:03,242 INFO L226 Difference]: Without dead ends: 3579 [2020-08-22 23:08:03,245 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 218 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15341 ImplicationChecksByTransitivity, 17.5s TimeCoverageRelationStatistics Valid=7143, Invalid=41037, Unknown=0, NotChecked=0, Total=48180 [2020-08-22 23:08:03,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3579 states. [2020-08-22 23:08:04,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3579 to 1499. [2020-08-22 23:08:04,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1499 states. [2020-08-22 23:08:04,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1499 states to 1499 states and 1601 transitions. [2020-08-22 23:08:04,271 INFO L78 Accepts]: Start accepts. Automaton has 1499 states and 1601 transitions. Word has length 431 [2020-08-22 23:08:04,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:08:04,272 INFO L479 AbstractCegarLoop]: Abstraction has 1499 states and 1601 transitions. [2020-08-22 23:08:04,272 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-08-22 23:08:04,272 INFO L276 IsEmpty]: Start isEmpty. Operand 1499 states and 1601 transitions. [2020-08-22 23:08:04,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 432 [2020-08-22 23:08:04,275 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:08:04,275 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 14, 14, 13, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:08:04,275 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2020-08-22 23:08:04,275 INFO L427 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:08:04,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:08:04,276 INFO L82 PathProgramCache]: Analyzing trace with hash 1554199897, now seen corresponding path program 43 times [2020-08-22 23:08:04,276 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:08:04,276 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2122625665] [2020-08-22 23:08:04,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:08:04,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:08:08,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:08:08,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:08:08,150 INFO L134 CoverageAnalysis]: Checked inductivity of 2153 backedges. 832 proven. 746 refuted. 0 times theorem prover too weak. 575 trivial. 0 not checked. [2020-08-22 23:08:08,150 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2122625665] [2020-08-22 23:08:08,150 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:08:08,150 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2020-08-22 23:08:08,150 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647905881] [2020-08-22 23:08:08,151 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-08-22 23:08:08,151 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:08:08,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-08-22 23:08:08,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=395, Invalid=3145, Unknown=0, NotChecked=0, Total=3540 [2020-08-22 23:08:08,152 INFO L87 Difference]: Start difference. First operand 1499 states and 1601 transitions. Second operand 60 states. [2020-08-22 23:08:35,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:08:35,258 INFO L93 Difference]: Finished difference Result 5100 states and 5465 transitions. [2020-08-22 23:08:35,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 181 states. [2020-08-22 23:08:35,261 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 431 [2020-08-22 23:08:35,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:08:35,263 INFO L225 Difference]: With dead ends: 5100 [2020-08-22 23:08:35,263 INFO L226 Difference]: Without dead ends: 744 [2020-08-22 23:08:35,269 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 221 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15694 ImplicationChecksByTransitivity, 20.7s TimeCoverageRelationStatistics Valid=6787, Invalid=42719, Unknown=0, NotChecked=0, Total=49506 [2020-08-22 23:08:35,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 744 states. [2020-08-22 23:08:35,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 744 to 744. [2020-08-22 23:08:35,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 744 states. [2020-08-22 23:08:35,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 744 states to 744 states and 784 transitions. [2020-08-22 23:08:35,639 INFO L78 Accepts]: Start accepts. Automaton has 744 states and 784 transitions. Word has length 431 [2020-08-22 23:08:35,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:08:35,639 INFO L479 AbstractCegarLoop]: Abstraction has 744 states and 784 transitions. [2020-08-22 23:08:35,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-08-22 23:08:35,639 INFO L276 IsEmpty]: Start isEmpty. Operand 744 states and 784 transitions. [2020-08-22 23:08:35,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 438 [2020-08-22 23:08:35,641 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:08:35,642 INFO L422 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:08:35,642 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72 [2020-08-22 23:08:35,642 INFO L427 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:08:35,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:08:35,642 INFO L82 PathProgramCache]: Analyzing trace with hash -770776951, now seen corresponding path program 44 times [2020-08-22 23:08:35,642 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:08:35,642 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1079551922] [2020-08-22 23:08:35,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:08:35,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:08:39,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:08:39,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:08:39,798 INFO L134 CoverageAnalysis]: Checked inductivity of 2220 backedges. 507 proven. 561 refuted. 0 times theorem prover too weak. 1152 trivial. 0 not checked. [2020-08-22 23:08:39,799 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1079551922] [2020-08-22 23:08:39,799 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:08:39,799 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-08-22 23:08:39,799 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111299223] [2020-08-22 23:08:39,799 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-08-22 23:08:39,799 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:08:39,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-08-22 23:08:39,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=2941, Unknown=0, NotChecked=0, Total=3422 [2020-08-22 23:08:39,800 INFO L87 Difference]: Start difference. First operand 744 states and 784 transitions. Second operand 59 states. [2020-08-22 23:08:52,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:08:52,122 INFO L93 Difference]: Finished difference Result 1197 states and 1273 transitions. [2020-08-22 23:08:52,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2020-08-22 23:08:52,126 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 437 [2020-08-22 23:08:52,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:08:52,128 INFO L225 Difference]: With dead ends: 1197 [2020-08-22 23:08:52,128 INFO L226 Difference]: Without dead ends: 974 [2020-08-22 23:08:52,129 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8001 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=5083, Invalid=21323, Unknown=0, NotChecked=0, Total=26406 [2020-08-22 23:08:52,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 974 states. [2020-08-22 23:08:52,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 974 to 750. [2020-08-22 23:08:52,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 750 states. [2020-08-22 23:08:52,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 750 states to 750 states and 790 transitions. [2020-08-22 23:08:52,571 INFO L78 Accepts]: Start accepts. Automaton has 750 states and 790 transitions. Word has length 437 [2020-08-22 23:08:52,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:08:52,571 INFO L479 AbstractCegarLoop]: Abstraction has 750 states and 790 transitions. [2020-08-22 23:08:52,571 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-08-22 23:08:52,571 INFO L276 IsEmpty]: Start isEmpty. Operand 750 states and 790 transitions. [2020-08-22 23:08:52,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 444 [2020-08-22 23:08:52,573 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:08:52,573 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:08:52,574 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73 [2020-08-22 23:08:52,574 INFO L427 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:08:52,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:08:52,574 INFO L82 PathProgramCache]: Analyzing trace with hash -1112653391, now seen corresponding path program 45 times [2020-08-22 23:08:52,574 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:08:52,574 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [205364825] [2020-08-22 23:08:52,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:08:52,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:08:57,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:08:57,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:08:57,236 INFO L134 CoverageAnalysis]: Checked inductivity of 2300 backedges. 511 proven. 1065 refuted. 0 times theorem prover too weak. 724 trivial. 0 not checked. [2020-08-22 23:08:57,237 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [205364825] [2020-08-22 23:08:57,237 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:08:57,237 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62] total 62 [2020-08-22 23:08:57,237 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481960531] [2020-08-22 23:08:57,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-08-22 23:08:57,238 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:08:57,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-08-22 23:08:57,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=487, Invalid=3295, Unknown=0, NotChecked=0, Total=3782 [2020-08-22 23:08:57,238 INFO L87 Difference]: Start difference. First operand 750 states and 790 transitions. Second operand 62 states. [2020-08-22 23:09:17,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:09:17,539 INFO L93 Difference]: Finished difference Result 2595 states and 2763 transitions. [2020-08-22 23:09:17,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2020-08-22 23:09:17,545 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 443 [2020-08-22 23:09:17,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:09:17,549 INFO L225 Difference]: With dead ends: 2595 [2020-08-22 23:09:17,549 INFO L226 Difference]: Without dead ends: 2589 [2020-08-22 23:09:17,551 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9415 ImplicationChecksByTransitivity, 17.8s TimeCoverageRelationStatistics Valid=6715, Invalid=26957, Unknown=0, NotChecked=0, Total=33672 [2020-08-22 23:09:17,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2589 states. [2020-08-22 23:09:18,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2589 to 1157. [2020-08-22 23:09:18,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1157 states. [2020-08-22 23:09:18,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1157 states to 1157 states and 1234 transitions. [2020-08-22 23:09:18,347 INFO L78 Accepts]: Start accepts. Automaton has 1157 states and 1234 transitions. Word has length 443 [2020-08-22 23:09:18,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:09:18,347 INFO L479 AbstractCegarLoop]: Abstraction has 1157 states and 1234 transitions. [2020-08-22 23:09:18,347 INFO L480 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-08-22 23:09:18,347 INFO L276 IsEmpty]: Start isEmpty. Operand 1157 states and 1234 transitions. [2020-08-22 23:09:18,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 444 [2020-08-22 23:09:18,350 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:09:18,350 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:09:18,350 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2020-08-22 23:09:18,350 INFO L427 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:09:18,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:09:18,351 INFO L82 PathProgramCache]: Analyzing trace with hash -1785403319, now seen corresponding path program 46 times [2020-08-22 23:09:18,351 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:09:18,351 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [856363969] [2020-08-22 23:09:18,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:09:18,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:09:22,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:09:22,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:09:23,102 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 965 proven. 692 refuted. 0 times theorem prover too weak. 644 trivial. 0 not checked. [2020-08-22 23:09:23,102 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [856363969] [2020-08-22 23:09:23,102 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:09:23,102 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-08-22 23:09:23,102 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282645338] [2020-08-22 23:09:23,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-08-22 23:09:23,103 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:09:23,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-08-22 23:09:23,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=3219, Unknown=0, NotChecked=0, Total=3660 [2020-08-22 23:09:23,104 INFO L87 Difference]: Start difference. First operand 1157 states and 1234 transitions. Second operand 61 states. [2020-08-22 23:09:53,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:09:53,993 INFO L93 Difference]: Finished difference Result 4277 states and 4581 transitions. [2020-08-22 23:09:53,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 171 states. [2020-08-22 23:09:53,998 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 443 [2020-08-22 23:09:53,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:09:54,002 INFO L225 Difference]: With dead ends: 4277 [2020-08-22 23:09:54,003 INFO L226 Difference]: Without dead ends: 3695 [2020-08-22 23:09:54,006 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 211 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13965 ImplicationChecksByTransitivity, 23.5s TimeCoverageRelationStatistics Valid=6251, Invalid=38905, Unknown=0, NotChecked=0, Total=45156 [2020-08-22 23:09:54,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3695 states. [2020-08-22 23:09:55,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3695 to 1397. [2020-08-22 23:09:55,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1397 states. [2020-08-22 23:09:55,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1397 states to 1397 states and 1492 transitions. [2020-08-22 23:09:55,190 INFO L78 Accepts]: Start accepts. Automaton has 1397 states and 1492 transitions. Word has length 443 [2020-08-22 23:09:55,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:09:55,191 INFO L479 AbstractCegarLoop]: Abstraction has 1397 states and 1492 transitions. [2020-08-22 23:09:55,191 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-08-22 23:09:55,191 INFO L276 IsEmpty]: Start isEmpty. Operand 1397 states and 1492 transitions. [2020-08-22 23:09:55,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 456 [2020-08-22 23:09:55,194 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:09:55,194 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:09:55,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75 [2020-08-22 23:09:55,194 INFO L427 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:09:55,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:09:55,195 INFO L82 PathProgramCache]: Analyzing trace with hash -263898311, now seen corresponding path program 47 times [2020-08-22 23:09:55,195 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:09:55,195 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [857829013] [2020-08-22 23:09:55,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:09:55,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:10:00,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:10:00,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:10:00,549 INFO L134 CoverageAnalysis]: Checked inductivity of 2461 backedges. 1110 proven. 627 refuted. 0 times theorem prover too weak. 724 trivial. 0 not checked. [2020-08-22 23:10:00,550 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [857829013] [2020-08-22 23:10:00,550 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:10:00,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-08-22 23:10:00,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646565783] [2020-08-22 23:10:00,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-08-22 23:10:00,551 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:10:00,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-08-22 23:10:00,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=487, Invalid=3173, Unknown=0, NotChecked=0, Total=3660 [2020-08-22 23:10:00,552 INFO L87 Difference]: Start difference. First operand 1397 states and 1492 transitions. Second operand 61 states. [2020-08-22 23:10:36,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:10:36,529 INFO L93 Difference]: Finished difference Result 4255 states and 4559 transitions. [2020-08-22 23:10:36,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 197 states. [2020-08-22 23:10:36,535 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 455 [2020-08-22 23:10:36,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:10:36,541 INFO L225 Difference]: With dead ends: 4255 [2020-08-22 23:10:36,541 INFO L226 Difference]: Without dead ends: 3946 [2020-08-22 23:10:36,544 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18033 ImplicationChecksByTransitivity, 29.1s TimeCoverageRelationStatistics Valid=8353, Invalid=48053, Unknown=0, NotChecked=0, Total=56406 [2020-08-22 23:10:36,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3946 states. [2020-08-22 23:10:37,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3946 to 1619. [2020-08-22 23:10:37,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1619 states. [2020-08-22 23:10:37,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1619 states to 1619 states and 1730 transitions. [2020-08-22 23:10:37,934 INFO L78 Accepts]: Start accepts. Automaton has 1619 states and 1730 transitions. Word has length 455 [2020-08-22 23:10:37,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:10:37,935 INFO L479 AbstractCegarLoop]: Abstraction has 1619 states and 1730 transitions. [2020-08-22 23:10:37,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-08-22 23:10:37,935 INFO L276 IsEmpty]: Start isEmpty. Operand 1619 states and 1730 transitions. [2020-08-22 23:10:37,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 456 [2020-08-22 23:10:37,938 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:10:37,939 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 15, 15, 14, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:10:37,939 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76 [2020-08-22 23:10:37,939 INFO L427 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:10:37,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:10:37,939 INFO L82 PathProgramCache]: Analyzing trace with hash -1511371311, now seen corresponding path program 48 times [2020-08-22 23:10:37,939 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:10:37,939 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [501554842] [2020-08-22 23:10:37,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:10:37,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:10:43,939 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:10:43,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:10:44,138 INFO L134 CoverageAnalysis]: Checked inductivity of 2474 backedges. 977 proven. 848 refuted. 0 times theorem prover too weak. 649 trivial. 0 not checked. [2020-08-22 23:10:44,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [501554842] [2020-08-22 23:10:44,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:10:44,139 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64] total 64 [2020-08-22 23:10:44,139 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534439273] [2020-08-22 23:10:44,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2020-08-22 23:10:44,140 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:10:44,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2020-08-22 23:10:44,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=451, Invalid=3581, Unknown=0, NotChecked=0, Total=4032 [2020-08-22 23:10:44,140 INFO L87 Difference]: Start difference. First operand 1619 states and 1730 transitions. Second operand 64 states. [2020-08-22 23:11:29,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:11:29,400 INFO L93 Difference]: Finished difference Result 5704 states and 6116 transitions. [2020-08-22 23:11:29,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 196 states. [2020-08-22 23:11:29,407 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 455 [2020-08-22 23:11:29,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:11:29,409 INFO L225 Difference]: With dead ends: 5704 [2020-08-22 23:11:29,409 INFO L226 Difference]: Without dead ends: 794 [2020-08-22 23:11:29,418 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 239 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18467 ImplicationChecksByTransitivity, 35.6s TimeCoverageRelationStatistics Valid=7880, Invalid=49960, Unknown=0, NotChecked=0, Total=57840 [2020-08-22 23:11:29,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 794 states. [2020-08-22 23:11:29,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 794 to 794. [2020-08-22 23:11:29,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 794 states. [2020-08-22 23:11:29,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 794 states to 794 states and 837 transitions. [2020-08-22 23:11:29,922 INFO L78 Accepts]: Start accepts. Automaton has 794 states and 837 transitions. Word has length 455 [2020-08-22 23:11:29,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:11:29,922 INFO L479 AbstractCegarLoop]: Abstraction has 794 states and 837 transitions. [2020-08-22 23:11:29,922 INFO L480 AbstractCegarLoop]: Interpolant automaton has 64 states. [2020-08-22 23:11:29,922 INFO L276 IsEmpty]: Start isEmpty. Operand 794 states and 837 transitions. [2020-08-22 23:11:29,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 462 [2020-08-22 23:11:29,925 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:11:29,925 INFO L422 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:11:29,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2020-08-22 23:11:29,926 INFO L427 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:11:29,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:11:29,926 INFO L82 PathProgramCache]: Analyzing trace with hash 141282561, now seen corresponding path program 49 times [2020-08-22 23:11:29,926 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:11:29,926 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [426563440] [2020-08-22 23:11:29,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:11:29,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:11:36,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:11:36,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:11:36,848 INFO L134 CoverageAnalysis]: Checked inductivity of 2547 backedges. 588 proven. 646 refuted. 0 times theorem prover too weak. 1313 trivial. 0 not checked. [2020-08-22 23:11:36,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [426563440] [2020-08-22 23:11:36,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:11:36,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63] total 63 [2020-08-22 23:11:36,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308174389] [2020-08-22 23:11:36,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2020-08-22 23:11:36,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:11:36,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2020-08-22 23:11:36,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=545, Invalid=3361, Unknown=0, NotChecked=0, Total=3906 [2020-08-22 23:11:36,850 INFO L87 Difference]: Start difference. First operand 794 states and 837 transitions. Second operand 63 states. [2020-08-22 23:11:58,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:11:58,239 INFO L93 Difference]: Finished difference Result 1271 states and 1352 transitions. [2020-08-22 23:11:58,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2020-08-22 23:11:58,245 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 461 [2020-08-22 23:11:58,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:11:58,248 INFO L225 Difference]: With dead ends: 1271 [2020-08-22 23:11:58,248 INFO L226 Difference]: Without dead ends: 1036 [2020-08-22 23:11:58,252 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9295 ImplicationChecksByTransitivity, 21.8s TimeCoverageRelationStatistics Valid=5858, Invalid=24592, Unknown=0, NotChecked=0, Total=30450 [2020-08-22 23:11:58,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1036 states. [2020-08-22 23:11:58,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1036 to 800. [2020-08-22 23:11:58,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 800 states. [2020-08-22 23:11:58,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 800 states to 800 states and 843 transitions. [2020-08-22 23:11:58,791 INFO L78 Accepts]: Start accepts. Automaton has 800 states and 843 transitions. Word has length 461 [2020-08-22 23:11:58,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:11:58,792 INFO L479 AbstractCegarLoop]: Abstraction has 800 states and 843 transitions. [2020-08-22 23:11:58,792 INFO L480 AbstractCegarLoop]: Interpolant automaton has 63 states. [2020-08-22 23:11:58,792 INFO L276 IsEmpty]: Start isEmpty. Operand 800 states and 843 transitions. [2020-08-22 23:11:58,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-08-22 23:11:58,795 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:11:58,795 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 14, 14, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:11:58,795 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78 [2020-08-22 23:11:58,795 INFO L427 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:11:58,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:11:58,796 INFO L82 PathProgramCache]: Analyzing trace with hash 585219625, now seen corresponding path program 50 times [2020-08-22 23:11:58,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:11:58,796 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1324487439] [2020-08-22 23:11:58,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:11:58,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:12:07,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:12:07,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:12:07,444 INFO L134 CoverageAnalysis]: Checked inductivity of 2633 backedges. 592 proven. 1231 refuted. 0 times theorem prover too weak. 810 trivial. 0 not checked. [2020-08-22 23:12:07,445 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1324487439] [2020-08-22 23:12:07,445 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:12:07,445 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66] total 66 [2020-08-22 23:12:07,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [459879992] [2020-08-22 23:12:07,446 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2020-08-22 23:12:07,446 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:12:07,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2020-08-22 23:12:07,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=551, Invalid=3739, Unknown=0, NotChecked=0, Total=4290 [2020-08-22 23:12:07,447 INFO L87 Difference]: Start difference. First operand 800 states and 843 transitions. Second operand 66 states. [2020-08-22 23:12:43,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:12:43,715 INFO L93 Difference]: Finished difference Result 2949 states and 3143 transitions. [2020-08-22 23:12:43,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2020-08-22 23:12:43,724 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 467 [2020-08-22 23:12:43,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:12:43,729 INFO L225 Difference]: With dead ends: 2949 [2020-08-22 23:12:43,730 INFO L226 Difference]: Without dead ends: 2943 [2020-08-22 23:12:43,733 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10866 ImplicationChecksByTransitivity, 32.1s TimeCoverageRelationStatistics Valid=7725, Invalid=30887, Unknown=0, NotChecked=0, Total=38612 [2020-08-22 23:12:43,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2943 states. [2020-08-22 23:12:44,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2943 to 1239. [2020-08-22 23:12:44,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1239 states. [2020-08-22 23:12:44,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1239 states to 1239 states and 1322 transitions. [2020-08-22 23:12:44,739 INFO L78 Accepts]: Start accepts. Automaton has 1239 states and 1322 transitions. Word has length 467 [2020-08-22 23:12:44,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:12:44,739 INFO L479 AbstractCegarLoop]: Abstraction has 1239 states and 1322 transitions. [2020-08-22 23:12:44,739 INFO L480 AbstractCegarLoop]: Interpolant automaton has 66 states. [2020-08-22 23:12:44,739 INFO L276 IsEmpty]: Start isEmpty. Operand 1239 states and 1322 transitions. [2020-08-22 23:12:44,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-08-22 23:12:44,743 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:12:44,743 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:12:44,743 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79 [2020-08-22 23:12:44,743 INFO L427 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:12:44,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:12:44,744 INFO L82 PathProgramCache]: Analyzing trace with hash 2125314241, now seen corresponding path program 51 times [2020-08-22 23:12:44,744 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:12:44,744 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [430416170] [2020-08-22 23:12:44,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:12:44,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:12:53,151 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:12:53,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:12:53,351 INFO L134 CoverageAnalysis]: Checked inductivity of 2634 backedges. 1122 proven. 788 refuted. 0 times theorem prover too weak. 724 trivial. 0 not checked. [2020-08-22 23:12:53,352 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [430416170] [2020-08-22 23:12:53,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:12:53,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65] total 65 [2020-08-22 23:12:53,353 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652208613] [2020-08-22 23:12:53,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-08-22 23:12:53,354 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:12:53,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-08-22 23:12:53,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=501, Invalid=3659, Unknown=0, NotChecked=0, Total=4160 [2020-08-22 23:12:53,355 INFO L87 Difference]: Start difference. First operand 1239 states and 1322 transitions. Second operand 65 states. [2020-08-22 23:13:35,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:13:35,102 INFO L93 Difference]: Finished difference Result 4761 states and 5102 transitions. [2020-08-22 23:13:35,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 184 states. [2020-08-22 23:13:35,108 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 467 [2020-08-22 23:13:35,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:13:35,113 INFO L225 Difference]: With dead ends: 4761 [2020-08-22 23:13:35,113 INFO L226 Difference]: Without dead ends: 4137 [2020-08-22 23:13:35,116 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 227 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16241 ImplicationChecksByTransitivity, 37.5s TimeCoverageRelationStatistics Valid=7206, Invalid=45006, Unknown=0, NotChecked=0, Total=52212 [2020-08-22 23:13:35,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4137 states. [2020-08-22 23:13:36,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4137 to 1503. [2020-08-22 23:13:36,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1503 states. [2020-08-22 23:13:36,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1503 states to 1503 states and 1606 transitions. [2020-08-22 23:13:36,694 INFO L78 Accepts]: Start accepts. Automaton has 1503 states and 1606 transitions. Word has length 467 [2020-08-22 23:13:36,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:13:36,695 INFO L479 AbstractCegarLoop]: Abstraction has 1503 states and 1606 transitions. [2020-08-22 23:13:36,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-08-22 23:13:36,695 INFO L276 IsEmpty]: Start isEmpty. Operand 1503 states and 1606 transitions. [2020-08-22 23:13:36,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 480 [2020-08-22 23:13:36,699 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:13:36,699 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:13:36,699 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80 [2020-08-22 23:13:36,699 INFO L427 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:13:36,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:13:36,700 INFO L82 PathProgramCache]: Analyzing trace with hash 1703527345, now seen corresponding path program 52 times [2020-08-22 23:13:36,700 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:13:36,700 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [144173530] [2020-08-22 23:13:36,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:13:36,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:13:44,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:13:44,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:13:44,885 INFO L134 CoverageAnalysis]: Checked inductivity of 2806 backedges. 1279 proven. 717 refuted. 0 times theorem prover too weak. 810 trivial. 0 not checked. [2020-08-22 23:13:44,886 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [144173530] [2020-08-22 23:13:44,886 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:13:44,886 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65] total 65 [2020-08-22 23:13:44,886 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506762485] [2020-08-22 23:13:44,887 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-08-22 23:13:44,887 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:13:44,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-08-22 23:13:44,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=551, Invalid=3609, Unknown=0, NotChecked=0, Total=4160 [2020-08-22 23:13:44,888 INFO L87 Difference]: Start difference. First operand 1503 states and 1606 transitions. Second operand 65 states. [2020-08-22 23:14:32,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:14:32,547 INFO L93 Difference]: Finished difference Result 4655 states and 4990 transitions. [2020-08-22 23:14:32,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 212 states. [2020-08-22 23:14:32,554 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 479 [2020-08-22 23:14:32,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:14:32,559 INFO L225 Difference]: With dead ends: 4655 [2020-08-22 23:14:32,559 INFO L226 Difference]: Without dead ends: 4325 [2020-08-22 23:14:32,565 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 254 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20941 ImplicationChecksByTransitivity, 43.5s TimeCoverageRelationStatistics Valid=9658, Invalid=55622, Unknown=0, NotChecked=0, Total=65280 [2020-08-22 23:14:32,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4325 states. [2020-08-22 23:14:34,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4325 to 1739. [2020-08-22 23:14:34,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1739 states. [2020-08-22 23:14:34,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1739 states to 1739 states and 1859 transitions. [2020-08-22 23:14:34,350 INFO L78 Accepts]: Start accepts. Automaton has 1739 states and 1859 transitions. Word has length 479 [2020-08-22 23:14:34,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:14:34,351 INFO L479 AbstractCegarLoop]: Abstraction has 1739 states and 1859 transitions. [2020-08-22 23:14:34,351 INFO L480 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-08-22 23:14:34,351 INFO L276 IsEmpty]: Start isEmpty. Operand 1739 states and 1859 transitions. [2020-08-22 23:14:34,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 480 [2020-08-22 23:14:34,355 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:14:34,356 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 16, 16, 15, 15, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:14:34,356 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81 [2020-08-22 23:14:34,356 INFO L427 AbstractCegarLoop]: === Iteration 83 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:14:34,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:14:34,356 INFO L82 PathProgramCache]: Analyzing trace with hash 1625172553, now seen corresponding path program 53 times [2020-08-22 23:14:34,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:14:34,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [71301517] [2020-08-22 23:14:34,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:14:34,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:14:43,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:14:43,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:14:43,527 INFO L134 CoverageAnalysis]: Checked inductivity of 2819 backedges. 1134 proven. 956 refuted. 0 times theorem prover too weak. 729 trivial. 0 not checked. [2020-08-22 23:14:43,528 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [71301517] [2020-08-22 23:14:43,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:14:43,528 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68] total 68 [2020-08-22 23:14:43,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767494724] [2020-08-22 23:14:43,529 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-08-22 23:14:43,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:14:43,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-08-22 23:14:43,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=511, Invalid=4045, Unknown=0, NotChecked=0, Total=4556 [2020-08-22 23:14:43,531 INFO L87 Difference]: Start difference. First operand 1739 states and 1859 transitions. Second operand 68 states.