/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 0.1.25-3af5e1f [2020-09-04 23:10:35,448 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 23:10:35,453 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 23:10:35,502 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 23:10:35,502 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 23:10:35,514 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 23:10:35,516 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 23:10:35,520 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 23:10:35,524 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 23:10:35,528 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 23:10:35,529 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 23:10:35,531 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 23:10:35,532 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 23:10:35,535 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 23:10:35,538 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 23:10:35,542 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 23:10:35,544 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 23:10:35,546 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 23:10:35,548 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 23:10:35,555 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 23:10:35,559 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 23:10:35,560 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 23:10:35,561 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 23:10:35,563 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 23:10:35,568 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-04 23:10:35,568 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-04 23:10:35,568 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-04 23:10:35,571 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-04 23:10:35,572 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-04 23:10:35,573 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-09-04 23:10:35,579 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 23:10:35,580 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 23:10:35,582 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 23:10:35,583 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-09-04 23:10:35,603 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 23:10:35,604 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 23:10:35,606 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 23:10:35,607 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 23:10:35,607 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 23:10:35,607 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 23:10:35,608 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 23:10:35,608 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 23:10:35,608 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 23:10:35,608 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 23:10:35,609 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 23:10:35,610 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 23:10:35,610 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 23:10:35,610 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 23:10:35,611 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 23:10:35,611 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-09-04 23:10:35,611 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 23:10:35,611 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 23:10:35,612 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 23:10:35,612 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 23:10:35,612 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-09-04 23:10:35,612 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 23:10:35,612 INFO L138 SettingsManager]: * Use separate solver for trace checks=false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-09-04 23:10:36,124 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 23:10:36,147 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 23:10:36,152 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 23:10:36,154 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 23:10:36,154 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 23:10:36,155 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-1.i [2020-09-04 23:10:36,252 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/88854e126/535576fe764843258a580ca5dfe41c01/FLAGea3775429 [2020-09-04 23:10:36,819 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 23:10:36,820 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/string-1.i [2020-09-04 23:10:36,829 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/88854e126/535576fe764843258a580ca5dfe41c01/FLAGea3775429 [2020-09-04 23:10:37,169 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/88854e126/535576fe764843258a580ca5dfe41c01 [2020-09-04 23:10:37,184 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 23:10:37,187 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 23:10:37,188 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 23:10:37,188 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 23:10:37,193 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 23:10:37,194 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 11:10:37" (1/1) ... [2020-09-04 23:10:37,198 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5b03ff29 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:37, skipping insertion in model container [2020-09-04 23:10:37,199 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 11:10:37" (1/1) ... [2020-09-04 23:10:37,208 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 23:10:37,235 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 23:10:37,447 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 23:10:37,452 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 23:10:37,482 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 23:10:37,505 INFO L208 MainTranslator]: Completed translation [2020-09-04 23:10:37,506 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:37 WrapperNode [2020-09-04 23:10:37,506 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 23:10:37,507 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 23:10:37,507 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 23:10:37,507 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 23:10:37,608 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:37" (1/1) ... [2020-09-04 23:10:37,608 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:37" (1/1) ... [2020-09-04 23:10:37,619 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:37" (1/1) ... [2020-09-04 23:10:37,620 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:37" (1/1) ... [2020-09-04 23:10:37,630 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:37" (1/1) ... [2020-09-04 23:10:37,644 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:37" (1/1) ... [2020-09-04 23:10:37,648 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:37" (1/1) ... [2020-09-04 23:10:37,656 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 23:10:37,657 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 23:10:37,657 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 23:10:37,657 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 23:10:37,660 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:37" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 23:10:37,736 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 23:10:37,736 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 23:10:37,737 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-09-04 23:10:37,737 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-04 23:10:37,737 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 23:10:37,737 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 23:10:37,737 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-04 23:10:37,737 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-09-04 23:10:37,738 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-04 23:10:37,738 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-09-04 23:10:37,738 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 23:10:37,738 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-04 23:10:37,738 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-09-04 23:10:37,738 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-09-04 23:10:37,738 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-04 23:10:37,739 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 23:10:37,739 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 23:10:38,148 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 23:10:38,148 INFO L295 CfgBuilder]: Removed 5 assume(true) statements. [2020-09-04 23:10:38,155 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 11:10:38 BoogieIcfgContainer [2020-09-04 23:10:38,156 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 23:10:38,157 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 23:10:38,157 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 23:10:38,162 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 23:10:38,162 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 11:10:37" (1/3) ... [2020-09-04 23:10:38,163 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a3b53bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 11:10:38, skipping insertion in model container [2020-09-04 23:10:38,163 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:10:37" (2/3) ... [2020-09-04 23:10:38,164 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a3b53bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 11:10:38, skipping insertion in model container [2020-09-04 23:10:38,164 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 11:10:38" (3/3) ... [2020-09-04 23:10:38,166 INFO L109 eAbstractionObserver]: Analyzing ICFG string-1.i [2020-09-04 23:10:38,179 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-04 23:10:38,190 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 23:10:38,217 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 23:10:38,247 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 23:10:38,247 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 23:10:38,247 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-04 23:10:38,248 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 23:10:38,248 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 23:10:38,248 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 23:10:38,248 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 23:10:38,248 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 23:10:38,268 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states. [2020-09-04 23:10:38,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-09-04 23:10:38,283 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:38,284 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] [2020-09-04 23:10:38,284 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:38,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:38,291 INFO L82 PathProgramCache]: Analyzing trace with hash -768807104, now seen corresponding path program 1 times [2020-09-04 23:10:38,301 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:38,301 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [330208343] [2020-09-04 23:10:38,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:38,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:38,518 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:38,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:38,538 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:10:38,539 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [330208343] [2020-09-04 23:10:38,542 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 23:10:38,542 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-04 23:10:38,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375782382] [2020-09-04 23:10:38,550 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-04 23:10:38,551 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:38,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-04 23:10:38,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-04 23:10:38,573 INFO L87 Difference]: Start difference. First operand 105 states. Second operand 3 states. [2020-09-04 23:10:38,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:38,891 INFO L93 Difference]: Finished difference Result 188 states and 215 transitions. [2020-09-04 23:10:38,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-04 23:10:38,893 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 37 [2020-09-04 23:10:38,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:38,905 INFO L225 Difference]: With dead ends: 188 [2020-09-04 23:10:38,906 INFO L226 Difference]: Without dead ends: 77 [2020-09-04 23:10:38,911 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-04 23:10:38,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-09-04 23:10:38,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2020-09-04 23:10:38,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-09-04 23:10:38,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 82 transitions. [2020-09-04 23:10:38,974 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 82 transitions. Word has length 37 [2020-09-04 23:10:38,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:38,975 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 82 transitions. [2020-09-04 23:10:38,975 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-04 23:10:38,975 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 82 transitions. [2020-09-04 23:10:38,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-09-04 23:10:38,977 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:38,977 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] [2020-09-04 23:10:38,978 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 23:10:38,978 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:38,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:38,979 INFO L82 PathProgramCache]: Analyzing trace with hash 1309055982, now seen corresponding path program 1 times [2020-09-04 23:10:38,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:38,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1794267008] [2020-09-04 23:10:38,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:39,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:39,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:39,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:39,092 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:10:39,093 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1794267008] [2020-09-04 23:10:39,093 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 23:10:39,094 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-04 23:10:39,094 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810048505] [2020-09-04 23:10:39,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-04 23:10:39,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:39,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-04 23:10:39,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-04 23:10:39,100 INFO L87 Difference]: Start difference. First operand 77 states and 82 transitions. Second operand 4 states. [2020-09-04 23:10:39,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:39,332 INFO L93 Difference]: Finished difference Result 144 states and 155 transitions. [2020-09-04 23:10:39,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-04 23:10:39,333 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 41 [2020-09-04 23:10:39,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:39,335 INFO L225 Difference]: With dead ends: 144 [2020-09-04 23:10:39,335 INFO L226 Difference]: Without dead ends: 89 [2020-09-04 23:10:39,336 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-04 23:10:39,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-09-04 23:10:39,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 79. [2020-09-04 23:10:39,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-09-04 23:10:39,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 84 transitions. [2020-09-04 23:10:39,349 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 84 transitions. Word has length 41 [2020-09-04 23:10:39,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:39,350 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 84 transitions. [2020-09-04 23:10:39,350 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-04 23:10:39,350 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 84 transitions. [2020-09-04 23:10:39,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-09-04 23:10:39,352 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:39,352 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] [2020-09-04 23:10:39,353 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 23:10:39,353 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:39,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:39,353 INFO L82 PathProgramCache]: Analyzing trace with hash 512896601, now seen corresponding path program 1 times [2020-09-04 23:10:39,354 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:39,354 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [7171409] [2020-09-04 23:10:39,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:39,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:39,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:39,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:39,454 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-04 23:10:39,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [7171409] [2020-09-04 23:10:39,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:39,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-09-04 23:10:39,456 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986623792] [2020-09-04 23:10:39,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-04 23:10:39,456 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:39,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-04 23:10:39,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-09-04 23:10:39,457 INFO L87 Difference]: Start difference. First operand 79 states and 84 transitions. Second operand 6 states. [2020-09-04 23:10:39,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:39,682 INFO L93 Difference]: Finished difference Result 152 states and 162 transitions. [2020-09-04 23:10:39,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-04 23:10:39,682 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 55 [2020-09-04 23:10:39,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:39,684 INFO L225 Difference]: With dead ends: 152 [2020-09-04 23:10:39,684 INFO L226 Difference]: Without dead ends: 96 [2020-09-04 23:10:39,686 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-09-04 23:10:39,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-09-04 23:10:39,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 86. [2020-09-04 23:10:39,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-09-04 23:10:39,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 91 transitions. [2020-09-04 23:10:39,708 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 91 transitions. Word has length 55 [2020-09-04 23:10:39,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:39,709 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 91 transitions. [2020-09-04 23:10:39,712 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-04 23:10:39,712 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 91 transitions. [2020-09-04 23:10:39,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-09-04 23:10:39,713 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:39,714 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] [2020-09-04 23:10:39,715 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-04 23:10:39,715 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:39,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:39,715 INFO L82 PathProgramCache]: Analyzing trace with hash 1958895614, now seen corresponding path program 2 times [2020-09-04 23:10:39,716 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:39,716 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [142935105] [2020-09-04 23:10:39,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:39,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:39,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:39,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:39,847 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:10:39,847 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [142935105] [2020-09-04 23:10:39,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:39,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-09-04 23:10:39,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893700627] [2020-09-04 23:10:39,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-04 23:10:39,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:39,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-04 23:10:39,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-09-04 23:10:39,850 INFO L87 Difference]: Start difference. First operand 86 states and 91 transitions. Second operand 6 states. [2020-09-04 23:10:40,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:40,041 INFO L93 Difference]: Finished difference Result 142 states and 151 transitions. [2020-09-04 23:10:40,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-04 23:10:40,042 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 62 [2020-09-04 23:10:40,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:40,043 INFO L225 Difference]: With dead ends: 142 [2020-09-04 23:10:40,044 INFO L226 Difference]: Without dead ends: 98 [2020-09-04 23:10:40,045 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-09-04 23:10:40,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-09-04 23:10:40,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 93. [2020-09-04 23:10:40,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-09-04 23:10:40,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 98 transitions. [2020-09-04 23:10:40,073 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 98 transitions. Word has length 62 [2020-09-04 23:10:40,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:40,076 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 98 transitions. [2020-09-04 23:10:40,076 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-04 23:10:40,077 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 98 transitions. [2020-09-04 23:10:40,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-09-04 23:10:40,083 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:40,083 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] [2020-09-04 23:10:40,083 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-04 23:10:40,083 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:40,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:40,085 INFO L82 PathProgramCache]: Analyzing trace with hash 11176526, now seen corresponding path program 3 times [2020-09-04 23:10:40,085 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:40,086 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [406648705] [2020-09-04 23:10:40,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:40,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:40,282 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:40,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:40,299 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:10:40,299 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [406648705] [2020-09-04 23:10:40,300 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:40,300 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-04 23:10:40,300 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197752027] [2020-09-04 23:10:40,304 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-04 23:10:40,304 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:40,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-04 23:10:40,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-09-04 23:10:40,306 INFO L87 Difference]: Start difference. First operand 93 states and 98 transitions. Second operand 8 states. [2020-09-04 23:10:40,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:40,536 INFO L93 Difference]: Finished difference Result 168 states and 178 transitions. [2020-09-04 23:10:40,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-04 23:10:40,537 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 69 [2020-09-04 23:10:40,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:40,538 INFO L225 Difference]: With dead ends: 168 [2020-09-04 23:10:40,538 INFO L226 Difference]: Without dead ends: 105 [2020-09-04 23:10:40,539 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2020-09-04 23:10:40,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-09-04 23:10:40,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 100. [2020-09-04 23:10:40,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-09-04 23:10:40,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 105 transitions. [2020-09-04 23:10:40,551 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 105 transitions. Word has length 69 [2020-09-04 23:10:40,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:40,551 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 105 transitions. [2020-09-04 23:10:40,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-04 23:10:40,552 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 105 transitions. [2020-09-04 23:10:40,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-09-04 23:10:40,553 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:40,553 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] [2020-09-04 23:10:40,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-04 23:10:40,554 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:40,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:40,554 INFO L82 PathProgramCache]: Analyzing trace with hash -1399032013, now seen corresponding path program 4 times [2020-09-04 23:10:40,554 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:40,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1564300608] [2020-09-04 23:10:40,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:40,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:40,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:40,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:40,719 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:10:40,719 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1564300608] [2020-09-04 23:10:40,719 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:40,720 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-04 23:10:40,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907487855] [2020-09-04 23:10:40,720 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-04 23:10:40,721 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:40,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-04 23:10:40,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-09-04 23:10:40,722 INFO L87 Difference]: Start difference. First operand 100 states and 105 transitions. Second operand 10 states. [2020-09-04 23:10:41,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:41,134 INFO L93 Difference]: Finished difference Result 175 states and 185 transitions. [2020-09-04 23:10:41,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-04 23:10:41,134 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 76 [2020-09-04 23:10:41,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:41,136 INFO L225 Difference]: With dead ends: 175 [2020-09-04 23:10:41,136 INFO L226 Difference]: Without dead ends: 112 [2020-09-04 23:10:41,139 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=160, Unknown=0, NotChecked=0, Total=240 [2020-09-04 23:10:41,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-09-04 23:10:41,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 107. [2020-09-04 23:10:41,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-09-04 23:10:41,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 112 transitions. [2020-09-04 23:10:41,161 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 112 transitions. Word has length 76 [2020-09-04 23:10:41,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:41,162 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 112 transitions. [2020-09-04 23:10:41,162 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-04 23:10:41,162 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 112 transitions. [2020-09-04 23:10:41,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-09-04 23:10:41,163 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:41,164 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] [2020-09-04 23:10:41,164 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-04 23:10:41,164 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:41,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:41,165 INFO L82 PathProgramCache]: Analyzing trace with hash 1633037998, now seen corresponding path program 5 times [2020-09-04 23:10:41,165 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:41,165 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1900369810] [2020-09-04 23:10:41,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:41,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:41,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:41,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:41,321 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 23:10:41,321 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1900369810] [2020-09-04 23:10:41,321 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:41,322 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-09-04 23:10:41,322 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834358001] [2020-09-04 23:10:41,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-04 23:10:41,323 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:41,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-04 23:10:41,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2020-09-04 23:10:41,323 INFO L87 Difference]: Start difference. First operand 107 states and 112 transitions. Second operand 12 states. [2020-09-04 23:10:41,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:41,703 INFO L93 Difference]: Finished difference Result 177 states and 187 transitions. [2020-09-04 23:10:41,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-09-04 23:10:41,704 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 83 [2020-09-04 23:10:41,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:41,706 INFO L225 Difference]: With dead ends: 177 [2020-09-04 23:10:41,706 INFO L226 Difference]: Without dead ends: 114 [2020-09-04 23:10:41,707 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=125, Invalid=255, Unknown=0, NotChecked=0, Total=380 [2020-09-04 23:10:41,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-09-04 23:10:41,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2020-09-04 23:10:41,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2020-09-04 23:10:41,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 119 transitions. [2020-09-04 23:10:41,718 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 119 transitions. Word has length 83 [2020-09-04 23:10:41,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:41,718 INFO L479 AbstractCegarLoop]: Abstraction has 114 states and 119 transitions. [2020-09-04 23:10:41,718 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-04 23:10:41,718 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 119 transitions. [2020-09-04 23:10:41,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-09-04 23:10:41,720 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:41,720 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] [2020-09-04 23:10:41,720 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-04 23:10:41,721 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:41,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:41,721 INFO L82 PathProgramCache]: Analyzing trace with hash 2059478739, now seen corresponding path program 6 times [2020-09-04 23:10:41,721 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:41,722 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56756926] [2020-09-04 23:10:41,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:41,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:41,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:41,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:41,819 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2020-09-04 23:10:41,819 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56756926] [2020-09-04 23:10:41,820 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:41,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-04 23:10:41,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346706207] [2020-09-04 23:10:41,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-04 23:10:41,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:41,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-04 23:10:41,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-09-04 23:10:41,822 INFO L87 Difference]: Start difference. First operand 114 states and 119 transitions. Second operand 8 states. [2020-09-04 23:10:42,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:42,036 INFO L93 Difference]: Finished difference Result 170 states and 179 transitions. [2020-09-04 23:10:42,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-04 23:10:42,037 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 90 [2020-09-04 23:10:42,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:42,038 INFO L225 Difference]: With dead ends: 170 [2020-09-04 23:10:42,038 INFO L226 Difference]: Without dead ends: 126 [2020-09-04 23:10:42,041 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2020-09-04 23:10:42,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-09-04 23:10:42,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 121. [2020-09-04 23:10:42,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-09-04 23:10:42,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 126 transitions. [2020-09-04 23:10:42,061 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 126 transitions. Word has length 90 [2020-09-04 23:10:42,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:42,063 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 126 transitions. [2020-09-04 23:10:42,063 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-04 23:10:42,063 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 126 transitions. [2020-09-04 23:10:42,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-09-04 23:10:42,064 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:42,064 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] [2020-09-04 23:10:42,065 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-04 23:10:42,065 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:42,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:42,066 INFO L82 PathProgramCache]: Analyzing trace with hash 2012961241, now seen corresponding path program 7 times [2020-09-04 23:10:42,066 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:42,066 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1541482263] [2020-09-04 23:10:42,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:42,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:42,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:42,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:42,208 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2020-09-04 23:10:42,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1541482263] [2020-09-04 23:10:42,209 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:42,209 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-04 23:10:42,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [515948745] [2020-09-04 23:10:42,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-04 23:10:42,210 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:42,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-04 23:10:42,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-09-04 23:10:42,211 INFO L87 Difference]: Start difference. First operand 121 states and 126 transitions. Second operand 10 states. [2020-09-04 23:10:42,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:42,490 INFO L93 Difference]: Finished difference Result 177 states and 186 transitions. [2020-09-04 23:10:42,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-04 23:10:42,490 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 97 [2020-09-04 23:10:42,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:42,491 INFO L225 Difference]: With dead ends: 177 [2020-09-04 23:10:42,492 INFO L226 Difference]: Without dead ends: 133 [2020-09-04 23:10:42,492 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=160, Unknown=0, NotChecked=0, Total=240 [2020-09-04 23:10:42,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-09-04 23:10:42,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 128. [2020-09-04 23:10:42,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2020-09-04 23:10:42,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 133 transitions. [2020-09-04 23:10:42,501 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 133 transitions. Word has length 97 [2020-09-04 23:10:42,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:42,502 INFO L479 AbstractCegarLoop]: Abstraction has 128 states and 133 transitions. [2020-09-04 23:10:42,502 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-04 23:10:42,502 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 133 transitions. [2020-09-04 23:10:42,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-09-04 23:10:42,503 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:42,503 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] [2020-09-04 23:10:42,504 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-04 23:10:42,504 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:42,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:42,504 INFO L82 PathProgramCache]: Analyzing trace with hash 1354290195, now seen corresponding path program 8 times [2020-09-04 23:10:42,505 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:42,505 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1632530945] [2020-09-04 23:10:42,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:42,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:42,630 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:42,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:42,647 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2020-09-04 23:10:42,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1632530945] [2020-09-04 23:10:42,648 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:42,648 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-09-04 23:10:42,648 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891139249] [2020-09-04 23:10:42,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-04 23:10:42,649 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:42,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-04 23:10:42,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2020-09-04 23:10:42,650 INFO L87 Difference]: Start difference. First operand 128 states and 133 transitions. Second operand 12 states. [2020-09-04 23:10:42,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:42,979 INFO L93 Difference]: Finished difference Result 179 states and 188 transitions. [2020-09-04 23:10:42,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-09-04 23:10:42,980 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 104 [2020-09-04 23:10:42,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:42,981 INFO L225 Difference]: With dead ends: 179 [2020-09-04 23:10:42,981 INFO L226 Difference]: Without dead ends: 135 [2020-09-04 23:10:42,982 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=125, Invalid=255, Unknown=0, NotChecked=0, Total=380 [2020-09-04 23:10:42,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2020-09-04 23:10:43,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2020-09-04 23:10:43,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2020-09-04 23:10:43,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 140 transitions. [2020-09-04 23:10:43,009 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 140 transitions. Word has length 104 [2020-09-04 23:10:43,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:43,009 INFO L479 AbstractCegarLoop]: Abstraction has 135 states and 140 transitions. [2020-09-04 23:10:43,009 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-04 23:10:43,009 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 140 transitions. [2020-09-04 23:10:43,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-09-04 23:10:43,010 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:43,011 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] [2020-09-04 23:10:43,011 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-04 23:10:43,011 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:43,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:43,012 INFO L82 PathProgramCache]: Analyzing trace with hash 1908556953, now seen corresponding path program 9 times [2020-09-04 23:10:43,012 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:43,012 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [444046256] [2020-09-04 23:10:43,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:43,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:43,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:43,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:43,133 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2020-09-04 23:10:43,134 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [444046256] [2020-09-04 23:10:43,134 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 23:10:43,134 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-09-04 23:10:43,134 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037948343] [2020-09-04 23:10:43,135 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-04 23:10:43,135 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:43,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-04 23:10:43,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-09-04 23:10:43,136 INFO L87 Difference]: Start difference. First operand 135 states and 140 transitions. Second operand 8 states. [2020-09-04 23:10:43,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:43,356 INFO L93 Difference]: Finished difference Result 171 states and 179 transitions. [2020-09-04 23:10:43,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-04 23:10:43,357 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 111 [2020-09-04 23:10:43,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:43,358 INFO L225 Difference]: With dead ends: 171 [2020-09-04 23:10:43,358 INFO L226 Difference]: Without dead ends: 140 [2020-09-04 23:10:43,359 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 [2020-09-04 23:10:43,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2020-09-04 23:10:43,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 137. [2020-09-04 23:10:43,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2020-09-04 23:10:43,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 142 transitions. [2020-09-04 23:10:43,368 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 142 transitions. Word has length 111 [2020-09-04 23:10:43,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:43,368 INFO L479 AbstractCegarLoop]: Abstraction has 137 states and 142 transitions. [2020-09-04 23:10:43,368 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-04 23:10:43,369 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 142 transitions. [2020-09-04 23:10:43,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-09-04 23:10:43,370 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:43,370 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] [2020-09-04 23:10:43,370 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-04 23:10:43,371 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:43,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:43,371 INFO L82 PathProgramCache]: Analyzing trace with hash 358773697, now seen corresponding path program 1 times [2020-09-04 23:10:43,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:43,372 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [578279629] [2020-09-04 23:10:43,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:43,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:43,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:43,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:43,506 INFO L134 CoverageAnalysis]: Checked inductivity of 152 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2020-09-04 23:10:43,506 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [578279629] [2020-09-04 23:10:43,506 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:43,507 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-04 23:10:43,507 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455818565] [2020-09-04 23:10:43,507 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-04 23:10:43,508 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:43,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-04 23:10:43,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-09-04 23:10:43,509 INFO L87 Difference]: Start difference. First operand 137 states and 142 transitions. Second operand 10 states. [2020-09-04 23:10:43,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:43,905 INFO L93 Difference]: Finished difference Result 189 states and 198 transitions. [2020-09-04 23:10:43,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-04 23:10:43,906 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 117 [2020-09-04 23:10:43,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:43,911 INFO L225 Difference]: With dead ends: 189 [2020-09-04 23:10:43,911 INFO L226 Difference]: Without dead ends: 183 [2020-09-04 23:10:43,912 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 [2020-09-04 23:10:43,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2020-09-04 23:10:43,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 164. [2020-09-04 23:10:43,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2020-09-04 23:10:43,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 172 transitions. [2020-09-04 23:10:43,932 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 172 transitions. Word has length 117 [2020-09-04 23:10:43,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:43,932 INFO L479 AbstractCegarLoop]: Abstraction has 164 states and 172 transitions. [2020-09-04 23:10:43,933 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-04 23:10:43,933 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 172 transitions. [2020-09-04 23:10:43,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-09-04 23:10:43,935 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:43,936 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] [2020-09-04 23:10:43,936 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-09-04 23:10:43,936 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:43,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:43,937 INFO L82 PathProgramCache]: Analyzing trace with hash 165455081, now seen corresponding path program 2 times [2020-09-04 23:10:43,938 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:43,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1272148492] [2020-09-04 23:10:43,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:43,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:44,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:44,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:44,140 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2020-09-04 23:10:44,140 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1272148492] [2020-09-04 23:10:44,141 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:44,141 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-09-04 23:10:44,141 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023540115] [2020-09-04 23:10:44,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-04 23:10:44,142 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:44,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-04 23:10:44,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2020-09-04 23:10:44,143 INFO L87 Difference]: Start difference. First operand 164 states and 172 transitions. Second operand 12 states. [2020-09-04 23:10:44,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:44,637 INFO L93 Difference]: Finished difference Result 190 states and 199 transitions. [2020-09-04 23:10:44,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-09-04 23:10:44,637 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 123 [2020-09-04 23:10:44,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:44,639 INFO L225 Difference]: With dead ends: 190 [2020-09-04 23:10:44,639 INFO L226 Difference]: Without dead ends: 184 [2020-09-04 23:10:44,640 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=83, Invalid=379, Unknown=0, NotChecked=0, Total=462 [2020-09-04 23:10:44,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2020-09-04 23:10:44,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 138. [2020-09-04 23:10:44,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2020-09-04 23:10:44,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 143 transitions. [2020-09-04 23:10:44,652 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 143 transitions. Word has length 123 [2020-09-04 23:10:44,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:44,653 INFO L479 AbstractCegarLoop]: Abstraction has 138 states and 143 transitions. [2020-09-04 23:10:44,653 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-04 23:10:44,653 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 143 transitions. [2020-09-04 23:10:44,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-09-04 23:10:44,654 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:44,655 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] [2020-09-04 23:10:44,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-09-04 23:10:44,655 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:44,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:44,655 INFO L82 PathProgramCache]: Analyzing trace with hash -647047863, now seen corresponding path program 1 times [2020-09-04 23:10:44,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:44,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [209065054] [2020-09-04 23:10:44,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:44,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:44,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:44,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:44,764 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 152 trivial. 0 not checked. [2020-09-04 23:10:44,765 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [209065054] [2020-09-04 23:10:44,765 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 23:10:44,765 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-09-04 23:10:44,765 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115294766] [2020-09-04 23:10:44,766 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-04 23:10:44,766 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:44,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-04 23:10:44,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-04 23:10:44,767 INFO L87 Difference]: Start difference. First operand 138 states and 143 transitions. Second operand 6 states. [2020-09-04 23:10:44,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:44,921 INFO L93 Difference]: Finished difference Result 181 states and 189 transitions. [2020-09-04 23:10:44,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-04 23:10:44,922 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 129 [2020-09-04 23:10:44,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:44,923 INFO L225 Difference]: With dead ends: 181 [2020-09-04 23:10:44,924 INFO L226 Difference]: Without dead ends: 143 [2020-09-04 23:10:44,924 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 [2020-09-04 23:10:44,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2020-09-04 23:10:44,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 140. [2020-09-04 23:10:44,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-09-04 23:10:44,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 145 transitions. [2020-09-04 23:10:44,939 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 145 transitions. Word has length 129 [2020-09-04 23:10:44,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:44,939 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 145 transitions. [2020-09-04 23:10:44,939 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-04 23:10:44,940 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 145 transitions. [2020-09-04 23:10:44,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-09-04 23:10:44,941 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:44,941 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] [2020-09-04 23:10:44,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-09-04 23:10:44,942 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:44,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:44,942 INFO L82 PathProgramCache]: Analyzing trace with hash -1209819887, now seen corresponding path program 1 times [2020-09-04 23:10:44,942 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:44,943 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [382372475] [2020-09-04 23:10:44,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:44,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:45,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:45,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:45,137 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 152 trivial. 0 not checked. [2020-09-04 23:10:45,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [382372475] [2020-09-04 23:10:45,138 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:45,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-09-04 23:10:45,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724851051] [2020-09-04 23:10:45,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-04 23:10:45,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:45,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-04 23:10:45,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2020-09-04 23:10:45,139 INFO L87 Difference]: Start difference. First operand 140 states and 145 transitions. Second operand 12 states. [2020-09-04 23:10:45,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:45,508 INFO L93 Difference]: Finished difference Result 197 states and 206 transitions. [2020-09-04 23:10:45,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-04 23:10:45,509 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 135 [2020-09-04 23:10:45,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:45,511 INFO L225 Difference]: With dead ends: 197 [2020-09-04 23:10:45,511 INFO L226 Difference]: Without dead ends: 149 [2020-09-04 23:10:45,515 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 [2020-09-04 23:10:45,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2020-09-04 23:10:45,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 146. [2020-09-04 23:10:45,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2020-09-04 23:10:45,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 151 transitions. [2020-09-04 23:10:45,534 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 151 transitions. Word has length 135 [2020-09-04 23:10:45,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:45,534 INFO L479 AbstractCegarLoop]: Abstraction has 146 states and 151 transitions. [2020-09-04 23:10:45,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-04 23:10:45,535 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 151 transitions. [2020-09-04 23:10:45,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2020-09-04 23:10:45,536 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:45,537 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] [2020-09-04 23:10:45,537 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-09-04 23:10:45,537 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:45,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:45,538 INFO L82 PathProgramCache]: Analyzing trace with hash -1023255495, now seen corresponding path program 2 times [2020-09-04 23:10:45,538 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:45,538 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [860278243] [2020-09-04 23:10:45,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:45,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:45,745 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:45,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:45,777 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 152 trivial. 0 not checked. [2020-09-04 23:10:45,778 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [860278243] [2020-09-04 23:10:45,780 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:45,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-09-04 23:10:45,781 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481370113] [2020-09-04 23:10:45,782 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-09-04 23:10:45,782 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:45,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-09-04 23:10:45,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2020-09-04 23:10:45,783 INFO L87 Difference]: Start difference. First operand 146 states and 151 transitions. Second operand 14 states. [2020-09-04 23:10:46,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:46,218 INFO L93 Difference]: Finished difference Result 171 states and 177 transitions. [2020-09-04 23:10:46,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-09-04 23:10:46,218 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 141 [2020-09-04 23:10:46,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:46,220 INFO L225 Difference]: With dead ends: 171 [2020-09-04 23:10:46,220 INFO L226 Difference]: Without dead ends: 165 [2020-09-04 23:10:46,221 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 [2020-09-04 23:10:46,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2020-09-04 23:10:46,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 158. [2020-09-04 23:10:46,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2020-09-04 23:10:46,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 164 transitions. [2020-09-04 23:10:46,238 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 164 transitions. Word has length 141 [2020-09-04 23:10:46,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:46,239 INFO L479 AbstractCegarLoop]: Abstraction has 158 states and 164 transitions. [2020-09-04 23:10:46,239 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-09-04 23:10:46,239 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 164 transitions. [2020-09-04 23:10:46,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2020-09-04 23:10:46,241 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:46,241 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] [2020-09-04 23:10:46,241 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-09-04 23:10:46,241 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:46,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:46,242 INFO L82 PathProgramCache]: Analyzing trace with hash -1679963711, now seen corresponding path program 3 times [2020-09-04 23:10:46,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:46,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2128871978] [2020-09-04 23:10:46,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:46,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:46,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:46,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:46,398 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 160 trivial. 0 not checked. [2020-09-04 23:10:46,398 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2128871978] [2020-09-04 23:10:46,399 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:46,399 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-04 23:10:46,399 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89905203] [2020-09-04 23:10:46,400 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-04 23:10:46,400 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:46,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-04 23:10:46,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-09-04 23:10:46,402 INFO L87 Difference]: Start difference. First operand 158 states and 164 transitions. Second operand 10 states. [2020-09-04 23:10:46,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:46,679 INFO L93 Difference]: Finished difference Result 240 states and 251 transitions. [2020-09-04 23:10:46,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-04 23:10:46,680 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 153 [2020-09-04 23:10:46,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:46,681 INFO L225 Difference]: With dead ends: 240 [2020-09-04 23:10:46,681 INFO L226 Difference]: Without dead ends: 167 [2020-09-04 23:10:46,682 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 [2020-09-04 23:10:46,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2020-09-04 23:10:46,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 164. [2020-09-04 23:10:46,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2020-09-04 23:10:46,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 170 transitions. [2020-09-04 23:10:46,701 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 170 transitions. Word has length 153 [2020-09-04 23:10:46,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:46,701 INFO L479 AbstractCegarLoop]: Abstraction has 164 states and 170 transitions. [2020-09-04 23:10:46,701 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-04 23:10:46,701 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 170 transitions. [2020-09-04 23:10:46,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2020-09-04 23:10:46,703 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:46,704 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] [2020-09-04 23:10:46,704 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-09-04 23:10:46,704 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:46,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:46,705 INFO L82 PathProgramCache]: Analyzing trace with hash 803846537, now seen corresponding path program 4 times [2020-09-04 23:10:46,705 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:46,706 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1330024888] [2020-09-04 23:10:46,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:46,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:46,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:46,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:46,983 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 2 proven. 22 refuted. 0 times theorem prover too weak. 160 trivial. 0 not checked. [2020-09-04 23:10:46,985 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1330024888] [2020-09-04 23:10:46,985 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:46,985 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-09-04 23:10:46,986 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803279283] [2020-09-04 23:10:46,988 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-09-04 23:10:46,996 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:46,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-09-04 23:10:46,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2020-09-04 23:10:46,997 INFO L87 Difference]: Start difference. First operand 164 states and 170 transitions. Second operand 16 states. [2020-09-04 23:10:47,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:47,462 INFO L93 Difference]: Finished difference Result 249 states and 261 transitions. [2020-09-04 23:10:47,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-09-04 23:10:47,463 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 159 [2020-09-04 23:10:47,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:47,464 INFO L225 Difference]: With dead ends: 249 [2020-09-04 23:10:47,464 INFO L226 Difference]: Without dead ends: 173 [2020-09-04 23:10:47,466 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=118, Invalid=694, Unknown=0, NotChecked=0, Total=812 [2020-09-04 23:10:47,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2020-09-04 23:10:47,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 170. [2020-09-04 23:10:47,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2020-09-04 23:10:47,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 176 transitions. [2020-09-04 23:10:47,479 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 176 transitions. Word has length 159 [2020-09-04 23:10:47,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:47,480 INFO L479 AbstractCegarLoop]: Abstraction has 170 states and 176 transitions. [2020-09-04 23:10:47,480 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-09-04 23:10:47,480 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 176 transitions. [2020-09-04 23:10:47,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2020-09-04 23:10:47,482 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:47,482 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] [2020-09-04 23:10:47,482 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-09-04 23:10:47,482 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:47,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:47,483 INFO L82 PathProgramCache]: Analyzing trace with hash 33884337, now seen corresponding path program 5 times [2020-09-04 23:10:47,483 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:47,483 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [292428084] [2020-09-04 23:10:47,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:47,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:47,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:47,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:47,770 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 12 proven. 26 refuted. 0 times theorem prover too weak. 160 trivial. 0 not checked. [2020-09-04 23:10:47,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [292428084] [2020-09-04 23:10:47,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:47,771 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-09-04 23:10:47,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762364640] [2020-09-04 23:10:47,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-09-04 23:10:47,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:47,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-09-04 23:10:47,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-09-04 23:10:47,772 INFO L87 Difference]: Start difference. First operand 170 states and 176 transitions. Second operand 18 states. [2020-09-04 23:10:48,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:48,394 INFO L93 Difference]: Finished difference Result 199 states and 206 transitions. [2020-09-04 23:10:48,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-09-04 23:10:48,395 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 165 [2020-09-04 23:10:48,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:48,399 INFO L225 Difference]: With dead ends: 199 [2020-09-04 23:10:48,399 INFO L226 Difference]: Without dead ends: 193 [2020-09-04 23:10:48,400 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 [2020-09-04 23:10:48,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2020-09-04 23:10:48,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 182. [2020-09-04 23:10:48,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2020-09-04 23:10:48,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 189 transitions. [2020-09-04 23:10:48,417 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 189 transitions. Word has length 165 [2020-09-04 23:10:48,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:48,418 INFO L479 AbstractCegarLoop]: Abstraction has 182 states and 189 transitions. [2020-09-04 23:10:48,418 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-09-04 23:10:48,418 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 189 transitions. [2020-09-04 23:10:48,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-09-04 23:10:48,420 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:48,420 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] [2020-09-04 23:10:48,421 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-09-04 23:10:48,421 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:48,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:48,421 INFO L82 PathProgramCache]: Analyzing trace with hash 1034519097, now seen corresponding path program 6 times [2020-09-04 23:10:48,422 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:48,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [842462799] [2020-09-04 23:10:48,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:48,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:48,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:48,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:48,627 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 30 proven. 19 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-09-04 23:10:48,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [842462799] [2020-09-04 23:10:48,627 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:48,628 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-09-04 23:10:48,628 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833931743] [2020-09-04 23:10:48,629 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-09-04 23:10:48,629 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:48,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-09-04 23:10:48,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2020-09-04 23:10:48,630 INFO L87 Difference]: Start difference. First operand 182 states and 189 transitions. Second operand 14 states. [2020-09-04 23:10:49,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:49,215 INFO L93 Difference]: Finished difference Result 361 states and 380 transitions. [2020-09-04 23:10:49,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-09-04 23:10:49,216 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 177 [2020-09-04 23:10:49,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:49,218 INFO L225 Difference]: With dead ends: 361 [2020-09-04 23:10:49,218 INFO L226 Difference]: Without dead ends: 283 [2020-09-04 23:10:49,219 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 [2020-09-04 23:10:49,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2020-09-04 23:10:49,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 230. [2020-09-04 23:10:49,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 230 states. [2020-09-04 23:10:49,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 239 transitions. [2020-09-04 23:10:49,242 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 239 transitions. Word has length 177 [2020-09-04 23:10:49,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:49,243 INFO L479 AbstractCegarLoop]: Abstraction has 230 states and 239 transitions. [2020-09-04 23:10:49,243 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-09-04 23:10:49,243 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 239 transitions. [2020-09-04 23:10:49,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2020-09-04 23:10:49,246 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:49,246 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] [2020-09-04 23:10:49,246 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-09-04 23:10:49,247 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:49,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:49,247 INFO L82 PathProgramCache]: Analyzing trace with hash 2119473665, now seen corresponding path program 7 times [2020-09-04 23:10:49,248 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:49,248 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1701421887] [2020-09-04 23:10:49,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:49,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:49,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:49,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:49,549 INFO L134 CoverageAnalysis]: Checked inductivity of 237 backedges. 16 proven. 47 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-09-04 23:10:49,549 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1701421887] [2020-09-04 23:10:49,549 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:49,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-09-04 23:10:49,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131239197] [2020-09-04 23:10:49,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-09-04 23:10:49,551 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:49,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-09-04 23:10:49,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2020-09-04 23:10:49,552 INFO L87 Difference]: Start difference. First operand 230 states and 239 transitions. Second operand 20 states. [2020-09-04 23:10:50,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:50,281 INFO L93 Difference]: Finished difference Result 372 states and 390 transitions. [2020-09-04 23:10:50,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-09-04 23:10:50,281 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 183 [2020-09-04 23:10:50,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:50,283 INFO L225 Difference]: With dead ends: 372 [2020-09-04 23:10:50,283 INFO L226 Difference]: Without dead ends: 248 [2020-09-04 23:10:50,285 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 [2020-09-04 23:10:50,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2020-09-04 23:10:50,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 242. [2020-09-04 23:10:50,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2020-09-04 23:10:50,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 251 transitions. [2020-09-04 23:10:50,305 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 251 transitions. Word has length 183 [2020-09-04 23:10:50,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:50,306 INFO L479 AbstractCegarLoop]: Abstraction has 242 states and 251 transitions. [2020-09-04 23:10:50,306 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-09-04 23:10:50,306 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 251 transitions. [2020-09-04 23:10:50,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-09-04 23:10:50,308 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:50,309 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] [2020-09-04 23:10:50,309 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-09-04 23:10:50,311 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:50,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:50,311 INFO L82 PathProgramCache]: Analyzing trace with hash 1835694377, now seen corresponding path program 8 times [2020-09-04 23:10:50,312 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:50,312 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2123374275] [2020-09-04 23:10:50,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:50,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:50,638 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:50,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:50,669 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 27 proven. 56 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-09-04 23:10:50,670 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2123374275] [2020-09-04 23:10:50,671 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:50,671 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-09-04 23:10:50,671 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761912494] [2020-09-04 23:10:50,672 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-09-04 23:10:50,672 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:50,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-09-04 23:10:50,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=395, Unknown=0, NotChecked=0, Total=462 [2020-09-04 23:10:50,673 INFO L87 Difference]: Start difference. First operand 242 states and 251 transitions. Second operand 22 states. [2020-09-04 23:10:51,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:51,536 INFO L93 Difference]: Finished difference Result 278 states and 288 transitions. [2020-09-04 23:10:51,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-09-04 23:10:51,538 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 189 [2020-09-04 23:10:51,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:51,540 INFO L225 Difference]: With dead ends: 278 [2020-09-04 23:10:51,540 INFO L226 Difference]: Without dead ends: 272 [2020-09-04 23:10:51,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=379, Invalid=1783, Unknown=0, NotChecked=0, Total=2162 [2020-09-04 23:10:51,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2020-09-04 23:10:51,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 254. [2020-09-04 23:10:51,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-09-04 23:10:51,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 264 transitions. [2020-09-04 23:10:51,562 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 264 transitions. Word has length 189 [2020-09-04 23:10:51,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:51,562 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 264 transitions. [2020-09-04 23:10:51,562 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-09-04 23:10:51,563 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 264 transitions. [2020-09-04 23:10:51,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-09-04 23:10:51,565 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:51,565 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] [2020-09-04 23:10:51,565 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-09-04 23:10:51,566 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:51,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:51,566 INFO L82 PathProgramCache]: Analyzing trace with hash -640549199, now seen corresponding path program 9 times [2020-09-04 23:10:51,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:51,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [671856822] [2020-09-04 23:10:51,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:51,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:51,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:51,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:51,837 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 59 proven. 41 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2020-09-04 23:10:51,838 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [671856822] [2020-09-04 23:10:51,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:51,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-09-04 23:10:51,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708905904] [2020-09-04 23:10:51,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-09-04 23:10:51,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:51,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-09-04 23:10:51,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-09-04 23:10:51,841 INFO L87 Difference]: Start difference. First operand 254 states and 264 transitions. Second operand 18 states. [2020-09-04 23:10:53,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:53,020 INFO L93 Difference]: Finished difference Result 569 states and 601 transitions. [2020-09-04 23:10:53,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-09-04 23:10:53,021 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 201 [2020-09-04 23:10:53,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:53,025 INFO L225 Difference]: With dead ends: 569 [2020-09-04 23:10:53,026 INFO L226 Difference]: Without dead ends: 470 [2020-09-04 23:10:53,027 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 490 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=346, Invalid=1816, Unknown=0, NotChecked=0, Total=2162 [2020-09-04 23:10:53,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2020-09-04 23:10:53,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 312. [2020-09-04 23:10:53,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 312 states. [2020-09-04 23:10:53,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 326 transitions. [2020-09-04 23:10:53,068 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 326 transitions. Word has length 201 [2020-09-04 23:10:53,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:53,069 INFO L479 AbstractCegarLoop]: Abstraction has 312 states and 326 transitions. [2020-09-04 23:10:53,069 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-09-04 23:10:53,069 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 326 transitions. [2020-09-04 23:10:53,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2020-09-04 23:10:53,075 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:53,075 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] [2020-09-04 23:10:53,076 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-09-04 23:10:53,077 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:53,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:53,078 INFO L82 PathProgramCache]: Analyzing trace with hash 639909497, now seen corresponding path program 10 times [2020-09-04 23:10:53,078 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:53,078 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2837467] [2020-09-04 23:10:53,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:53,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:53,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:53,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:53,603 INFO L134 CoverageAnalysis]: Checked inductivity of 314 backedges. 42 proven. 78 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2020-09-04 23:10:53,604 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2837467] [2020-09-04 23:10:53,604 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:53,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-09-04 23:10:53,605 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169855776] [2020-09-04 23:10:53,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-09-04 23:10:53,606 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:53,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-09-04 23:10:53,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=480, Unknown=0, NotChecked=0, Total=552 [2020-09-04 23:10:53,607 INFO L87 Difference]: Start difference. First operand 312 states and 326 transitions. Second operand 24 states. [2020-09-04 23:10:54,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:54,772 INFO L93 Difference]: Finished difference Result 527 states and 555 transitions. [2020-09-04 23:10:54,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-09-04 23:10:54,772 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 207 [2020-09-04 23:10:54,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:54,775 INFO L225 Difference]: With dead ends: 527 [2020-09-04 23:10:54,775 INFO L226 Difference]: Without dead ends: 339 [2020-09-04 23:10:54,776 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=296, Invalid=1866, Unknown=0, NotChecked=0, Total=2162 [2020-09-04 23:10:54,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2020-09-04 23:10:54,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 330. [2020-09-04 23:10:54,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 330 states. [2020-09-04 23:10:54,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 344 transitions. [2020-09-04 23:10:54,805 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 344 transitions. Word has length 207 [2020-09-04 23:10:54,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:54,806 INFO L479 AbstractCegarLoop]: Abstraction has 330 states and 344 transitions. [2020-09-04 23:10:54,806 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-09-04 23:10:54,806 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 344 transitions. [2020-09-04 23:10:54,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2020-09-04 23:10:54,808 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:54,808 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] [2020-09-04 23:10:54,808 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-09-04 23:10:54,808 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:54,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:54,809 INFO L82 PathProgramCache]: Analyzing trace with hash -558715487, now seen corresponding path program 11 times [2020-09-04 23:10:54,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:54,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [994344856] [2020-09-04 23:10:54,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:54,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:55,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:55,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:55,329 INFO L134 CoverageAnalysis]: Checked inductivity of 340 backedges. 48 proven. 98 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2020-09-04 23:10:55,330 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [994344856] [2020-09-04 23:10:55,330 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:55,330 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-09-04 23:10:55,330 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508519348] [2020-09-04 23:10:55,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-09-04 23:10:55,332 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:55,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-09-04 23:10:55,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=559, Unknown=0, NotChecked=0, Total=650 [2020-09-04 23:10:55,333 INFO L87 Difference]: Start difference. First operand 330 states and 344 transitions. Second operand 26 states. [2020-09-04 23:10:56,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:56,424 INFO L93 Difference]: Finished difference Result 385 states and 400 transitions. [2020-09-04 23:10:56,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-09-04 23:10:56,424 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 213 [2020-09-04 23:10:56,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:56,427 INFO L225 Difference]: With dead ends: 385 [2020-09-04 23:10:56,427 INFO L226 Difference]: Without dead ends: 379 [2020-09-04 23:10:56,429 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 656 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=567, Invalid=2625, Unknown=0, NotChecked=0, Total=3192 [2020-09-04 23:10:56,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2020-09-04 23:10:56,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 342. [2020-09-04 23:10:56,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 342 states. [2020-09-04 23:10:56,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 357 transitions. [2020-09-04 23:10:56,461 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 357 transitions. Word has length 213 [2020-09-04 23:10:56,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:56,461 INFO L479 AbstractCegarLoop]: Abstraction has 342 states and 357 transitions. [2020-09-04 23:10:56,461 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-09-04 23:10:56,461 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 357 transitions. [2020-09-04 23:10:56,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2020-09-04 23:10:56,463 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:56,463 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] [2020-09-04 23:10:56,464 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-09-04 23:10:56,464 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:56,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:56,464 INFO L82 PathProgramCache]: Analyzing trace with hash 165101353, now seen corresponding path program 12 times [2020-09-04 23:10:56,464 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:56,465 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [161239031] [2020-09-04 23:10:56,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:56,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:56,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:56,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:56,918 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 100 proven. 69 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-09-04 23:10:56,918 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [161239031] [2020-09-04 23:10:56,918 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:56,919 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-09-04 23:10:56,919 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173397649] [2020-09-04 23:10:56,921 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-09-04 23:10:56,922 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:56,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-09-04 23:10:56,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=393, Unknown=0, NotChecked=0, Total=462 [2020-09-04 23:10:56,924 INFO L87 Difference]: Start difference. First operand 342 states and 357 transitions. Second operand 22 states. [2020-09-04 23:10:58,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:10:58,685 INFO L93 Difference]: Finished difference Result 855 states and 905 transitions. [2020-09-04 23:10:58,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-09-04 23:10:58,685 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 225 [2020-09-04 23:10:58,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:10:58,689 INFO L225 Difference]: With dead ends: 855 [2020-09-04 23:10:58,690 INFO L226 Difference]: Without dead ends: 735 [2020-09-04 23:10:58,692 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1374 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=768, Invalid=4202, Unknown=0, NotChecked=0, Total=4970 [2020-09-04 23:10:58,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 735 states. [2020-09-04 23:10:58,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 735 to 406. [2020-09-04 23:10:58,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 406 states. [2020-09-04 23:10:58,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 406 states to 406 states and 425 transitions. [2020-09-04 23:10:58,739 INFO L78 Accepts]: Start accepts. Automaton has 406 states and 425 transitions. Word has length 225 [2020-09-04 23:10:58,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:10:58,739 INFO L479 AbstractCegarLoop]: Abstraction has 406 states and 425 transitions. [2020-09-04 23:10:58,740 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-09-04 23:10:58,740 INFO L276 IsEmpty]: Start isEmpty. Operand 406 states and 425 transitions. [2020-09-04 23:10:58,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2020-09-04 23:10:58,741 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:10:58,742 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] [2020-09-04 23:10:58,742 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-09-04 23:10:58,742 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:10:58,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:10:58,744 INFO L82 PathProgramCache]: Analyzing trace with hash 685287153, now seen corresponding path program 13 times [2020-09-04 23:10:58,744 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:10:58,744 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1172350089] [2020-09-04 23:10:58,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:10:58,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:59,206 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:10:59,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:10:59,262 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 80 proven. 115 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-09-04 23:10:59,262 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1172350089] [2020-09-04 23:10:59,262 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:10:59,262 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-09-04 23:10:59,263 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1532037906] [2020-09-04 23:10:59,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-09-04 23:10:59,263 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:10:59,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-09-04 23:10:59,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=660, Unknown=0, NotChecked=0, Total=756 [2020-09-04 23:10:59,264 INFO L87 Difference]: Start difference. First operand 406 states and 425 transitions. Second operand 28 states. [2020-09-04 23:11:00,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:00,643 INFO L93 Difference]: Finished difference Result 706 states and 745 transitions. [2020-09-04 23:11:00,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-09-04 23:11:00,643 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 231 [2020-09-04 23:11:00,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:00,646 INFO L225 Difference]: With dead ends: 706 [2020-09-04 23:11:00,646 INFO L226 Difference]: Without dead ends: 442 [2020-09-04 23:11:00,648 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 [2020-09-04 23:11:00,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2020-09-04 23:11:00,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 430. [2020-09-04 23:11:00,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 430 states. [2020-09-04 23:11:00,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 449 transitions. [2020-09-04 23:11:00,691 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 449 transitions. Word has length 231 [2020-09-04 23:11:00,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:00,691 INFO L479 AbstractCegarLoop]: Abstraction has 430 states and 449 transitions. [2020-09-04 23:11:00,691 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-09-04 23:11:00,691 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 449 transitions. [2020-09-04 23:11:00,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-09-04 23:11:00,693 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:00,694 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] [2020-09-04 23:11:00,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-09-04 23:11:00,694 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:00,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:00,694 INFO L82 PathProgramCache]: Analyzing trace with hash 232629785, now seen corresponding path program 14 times [2020-09-04 23:11:00,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:00,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1965339687] [2020-09-04 23:11:00,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:00,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:01,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:01,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:01,310 INFO L134 CoverageAnalysis]: Checked inductivity of 447 backedges. 75 proven. 152 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-09-04 23:11:01,310 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1965339687] [2020-09-04 23:11:01,310 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:01,311 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-09-04 23:11:01,311 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626221877] [2020-09-04 23:11:01,311 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-09-04 23:11:01,311 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:01,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-09-04 23:11:01,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=751, Unknown=0, NotChecked=0, Total=870 [2020-09-04 23:11:01,312 INFO L87 Difference]: Start difference. First operand 430 states and 449 transitions. Second operand 30 states. [2020-09-04 23:11:02,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:02,790 INFO L93 Difference]: Finished difference Result 516 states and 537 transitions. [2020-09-04 23:11:02,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-09-04 23:11:02,795 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 237 [2020-09-04 23:11:02,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:02,798 INFO L225 Difference]: With dead ends: 516 [2020-09-04 23:11:02,798 INFO L226 Difference]: Without dead ends: 510 [2020-09-04 23:11:02,800 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 943 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=795, Invalid=3627, Unknown=0, NotChecked=0, Total=4422 [2020-09-04 23:11:02,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 510 states. [2020-09-04 23:11:02,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 510 to 442. [2020-09-04 23:11:02,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 442 states. [2020-09-04 23:11:02,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 442 states to 442 states and 462 transitions. [2020-09-04 23:11:02,860 INFO L78 Accepts]: Start accepts. Automaton has 442 states and 462 transitions. Word has length 237 [2020-09-04 23:11:02,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:02,861 INFO L479 AbstractCegarLoop]: Abstraction has 442 states and 462 transitions. [2020-09-04 23:11:02,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-09-04 23:11:02,861 INFO L276 IsEmpty]: Start isEmpty. Operand 442 states and 462 transitions. [2020-09-04 23:11:02,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-09-04 23:11:02,863 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:02,863 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] [2020-09-04 23:11:02,863 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-09-04 23:11:02,864 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:02,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:02,864 INFO L82 PathProgramCache]: Analyzing trace with hash -2051456095, now seen corresponding path program 15 times [2020-09-04 23:11:02,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:02,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1702924978] [2020-09-04 23:11:02,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:02,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:03,282 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:03,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:03,339 INFO L134 CoverageAnalysis]: Checked inductivity of 508 backedges. 153 proven. 103 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2020-09-04 23:11:03,339 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1702924978] [2020-09-04 23:11:03,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:03,340 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-09-04 23:11:03,340 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219780031] [2020-09-04 23:11:03,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-09-04 23:11:03,341 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:03,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-09-04 23:11:03,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2020-09-04 23:11:03,341 INFO L87 Difference]: Start difference. First operand 442 states and 462 transitions. Second operand 26 states. [2020-09-04 23:11:06,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:06,341 INFO L93 Difference]: Finished difference Result 1219 states and 1292 transitions. [2020-09-04 23:11:06,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2020-09-04 23:11:06,341 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 249 [2020-09-04 23:11:06,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:06,347 INFO L225 Difference]: With dead ends: 1219 [2020-09-04 23:11:06,347 INFO L226 Difference]: Without dead ends: 1078 [2020-09-04 23:11:06,351 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3215 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1564, Invalid=8536, Unknown=0, NotChecked=0, Total=10100 [2020-09-04 23:11:06,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1078 states. [2020-09-04 23:11:06,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1078 to 512. [2020-09-04 23:11:06,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 512 states. [2020-09-04 23:11:06,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 512 states to 512 states and 536 transitions. [2020-09-04 23:11:06,419 INFO L78 Accepts]: Start accepts. Automaton has 512 states and 536 transitions. Word has length 249 [2020-09-04 23:11:06,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:06,419 INFO L479 AbstractCegarLoop]: Abstraction has 512 states and 536 transitions. [2020-09-04 23:11:06,419 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-09-04 23:11:06,420 INFO L276 IsEmpty]: Start isEmpty. Operand 512 states and 536 transitions. [2020-09-04 23:11:06,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 252 [2020-09-04 23:11:06,422 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:06,422 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] [2020-09-04 23:11:06,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-09-04 23:11:06,423 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:06,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:06,423 INFO L82 PathProgramCache]: Analyzing trace with hash 932737505, now seen corresponding path program 1 times [2020-09-04 23:11:06,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:06,423 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [536608186] [2020-09-04 23:11:06,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:06,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:06,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:06,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:06,917 INFO L134 CoverageAnalysis]: Checked inductivity of 550 backedges. 202 proven. 96 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2020-09-04 23:11:06,918 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [536608186] [2020-09-04 23:11:06,918 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:06,918 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-09-04 23:11:06,918 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948582588] [2020-09-04 23:11:06,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-09-04 23:11:06,919 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:06,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-09-04 23:11:06,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2020-09-04 23:11:06,919 INFO L87 Difference]: Start difference. First operand 512 states and 536 transitions. Second operand 25 states. [2020-09-04 23:11:07,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:07,819 INFO L93 Difference]: Finished difference Result 633 states and 664 transitions. [2020-09-04 23:11:07,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-09-04 23:11:07,820 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 251 [2020-09-04 23:11:07,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:07,823 INFO L225 Difference]: With dead ends: 633 [2020-09-04 23:11:07,823 INFO L226 Difference]: Without dead ends: 468 [2020-09-04 23:11:07,825 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 434 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=244, Invalid=1478, Unknown=0, NotChecked=0, Total=1722 [2020-09-04 23:11:07,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 468 states. [2020-09-04 23:11:07,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 468 to 468. [2020-09-04 23:11:07,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 468 states. [2020-09-04 23:11:07,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 490 transitions. [2020-09-04 23:11:07,880 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 490 transitions. Word has length 251 [2020-09-04 23:11:07,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:07,880 INFO L479 AbstractCegarLoop]: Abstraction has 468 states and 490 transitions. [2020-09-04 23:11:07,880 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-09-04 23:11:07,881 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 490 transitions. [2020-09-04 23:11:07,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2020-09-04 23:11:07,882 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:07,883 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] [2020-09-04 23:11:07,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-09-04 23:11:07,883 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:07,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:07,883 INFO L82 PathProgramCache]: Analyzing trace with hash -1502489751, now seen corresponding path program 16 times [2020-09-04 23:11:07,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:07,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [802883910] [2020-09-04 23:11:07,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:07,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:10,846 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:10,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:11,062 INFO L134 CoverageAnalysis]: Checked inductivity of 540 backedges. 89 proven. 257 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2020-09-04 23:11:11,062 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [802883910] [2020-09-04 23:11:11,062 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:11,063 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-09-04 23:11:11,063 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782218811] [2020-09-04 23:11:11,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-09-04 23:11:11,063 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:11,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-09-04 23:11:11,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1886, Unknown=0, NotChecked=0, Total=2070 [2020-09-04 23:11:11,065 INFO L87 Difference]: Start difference. First operand 468 states and 490 transitions. Second operand 46 states. [2020-09-04 23:11:19,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:19,378 INFO L93 Difference]: Finished difference Result 959 states and 1017 transitions. [2020-09-04 23:11:19,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2020-09-04 23:11:19,378 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 255 [2020-09-04 23:11:19,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:19,383 INFO L225 Difference]: With dead ends: 959 [2020-09-04 23:11:19,383 INFO L226 Difference]: Without dead ends: 876 [2020-09-04 23:11:19,387 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2312 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=746, Invalid=10596, Unknown=0, NotChecked=0, Total=11342 [2020-09-04 23:11:19,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 876 states. [2020-09-04 23:11:19,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 876 to 472. [2020-09-04 23:11:19,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 472 states. [2020-09-04 23:11:19,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 495 transitions. [2020-09-04 23:11:19,462 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 495 transitions. Word has length 255 [2020-09-04 23:11:19,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:19,463 INFO L479 AbstractCegarLoop]: Abstraction has 472 states and 495 transitions. [2020-09-04 23:11:19,463 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-09-04 23:11:19,463 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 495 transitions. [2020-09-04 23:11:19,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2020-09-04 23:11:19,465 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:19,465 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] [2020-09-04 23:11:19,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-09-04 23:11:19,466 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:19,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:19,466 INFO L82 PathProgramCache]: Analyzing trace with hash 208416681, now seen corresponding path program 2 times [2020-09-04 23:11:19,466 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:19,467 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [400910456] [2020-09-04 23:11:19,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:19,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:19,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:19,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:20,016 INFO L134 CoverageAnalysis]: Checked inductivity of 564 backedges. 202 proven. 110 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2020-09-04 23:11:20,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [400910456] [2020-09-04 23:11:20,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:20,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-09-04 23:11:20,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505316124] [2020-09-04 23:11:20,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-09-04 23:11:20,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:20,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-09-04 23:11:20,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=608, Unknown=0, NotChecked=0, Total=702 [2020-09-04 23:11:20,018 INFO L87 Difference]: Start difference. First operand 472 states and 495 transitions. Second operand 27 states. [2020-09-04 23:11:21,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:21,587 INFO L93 Difference]: Finished difference Result 743 states and 784 transitions. [2020-09-04 23:11:21,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-09-04 23:11:21,588 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 257 [2020-09-04 23:11:21,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:21,592 INFO L225 Difference]: With dead ends: 743 [2020-09-04 23:11:21,592 INFO L226 Difference]: Without dead ends: 586 [2020-09-04 23:11:21,593 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 892 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=460, Invalid=2846, Unknown=0, NotChecked=0, Total=3306 [2020-09-04 23:11:21,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2020-09-04 23:11:21,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 484. [2020-09-04 23:11:21,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 484 states. [2020-09-04 23:11:21,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 507 transitions. [2020-09-04 23:11:21,672 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 507 transitions. Word has length 257 [2020-09-04 23:11:21,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:21,672 INFO L479 AbstractCegarLoop]: Abstraction has 484 states and 507 transitions. [2020-09-04 23:11:21,672 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-09-04 23:11:21,673 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 507 transitions. [2020-09-04 23:11:21,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2020-09-04 23:11:21,674 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:21,674 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] [2020-09-04 23:11:21,674 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-09-04 23:11:21,675 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:21,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:21,675 INFO L82 PathProgramCache]: Analyzing trace with hash -1021540487, now seen corresponding path program 3 times [2020-09-04 23:11:21,675 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:21,676 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1891756503] [2020-09-04 23:11:21,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:21,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:22,198 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:22,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:22,243 INFO L134 CoverageAnalysis]: Checked inductivity of 565 backedges. 190 proven. 123 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2020-09-04 23:11:22,244 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1891756503] [2020-09-04 23:11:22,244 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:22,244 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-09-04 23:11:22,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382881814] [2020-09-04 23:11:22,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-09-04 23:11:22,245 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:22,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-09-04 23:11:22,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=693, Unknown=0, NotChecked=0, Total=812 [2020-09-04 23:11:22,245 INFO L87 Difference]: Start difference. First operand 484 states and 507 transitions. Second operand 29 states. [2020-09-04 23:11:26,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:26,004 INFO L93 Difference]: Finished difference Result 1405 states and 1490 transitions. [2020-09-04 23:11:26,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2020-09-04 23:11:26,004 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 263 [2020-09-04 23:11:26,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:26,010 INFO L225 Difference]: With dead ends: 1405 [2020-09-04 23:11:26,011 INFO L226 Difference]: Without dead ends: 1264 [2020-09-04 23:11:26,012 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4907 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2211, Invalid=12309, Unknown=0, NotChecked=0, Total=14520 [2020-09-04 23:11:26,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1264 states. [2020-09-04 23:11:26,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1264 to 542. [2020-09-04 23:11:26,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 542 states. [2020-09-04 23:11:26,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 542 states to 542 states and 568 transitions. [2020-09-04 23:11:26,119 INFO L78 Accepts]: Start accepts. Automaton has 542 states and 568 transitions. Word has length 263 [2020-09-04 23:11:26,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:26,120 INFO L479 AbstractCegarLoop]: Abstraction has 542 states and 568 transitions. [2020-09-04 23:11:26,120 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-09-04 23:11:26,120 INFO L276 IsEmpty]: Start isEmpty. Operand 542 states and 568 transitions. [2020-09-04 23:11:26,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2020-09-04 23:11:26,122 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:26,122 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] [2020-09-04 23:11:26,123 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-09-04 23:11:26,123 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:26,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:26,123 INFO L82 PathProgramCache]: Analyzing trace with hash 77363057, now seen corresponding path program 4 times [2020-09-04 23:11:26,124 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:26,124 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1088151998] [2020-09-04 23:11:26,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:26,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:26,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:26,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:26,717 INFO L134 CoverageAnalysis]: Checked inductivity of 584 backedges. 202 proven. 130 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2020-09-04 23:11:26,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1088151998] [2020-09-04 23:11:26,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:26,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-09-04 23:11:26,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263321499] [2020-09-04 23:11:26,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-09-04 23:11:26,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:26,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-09-04 23:11:26,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=707, Unknown=0, NotChecked=0, Total=812 [2020-09-04 23:11:26,718 INFO L87 Difference]: Start difference. First operand 542 states and 568 transitions. Second operand 29 states. [2020-09-04 23:11:29,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:29,474 INFO L93 Difference]: Finished difference Result 998 states and 1055 transitions. [2020-09-04 23:11:29,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2020-09-04 23:11:29,475 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 263 [2020-09-04 23:11:29,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:29,480 INFO L225 Difference]: With dead ends: 998 [2020-09-04 23:11:29,480 INFO L226 Difference]: Without dead ends: 875 [2020-09-04 23:11:29,482 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2078 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=914, Invalid=6058, Unknown=0, NotChecked=0, Total=6972 [2020-09-04 23:11:29,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 875 states. [2020-09-04 23:11:29,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 875 to 598. [2020-09-04 23:11:29,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 598 states. [2020-09-04 23:11:29,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 598 states to 598 states and 628 transitions. [2020-09-04 23:11:29,620 INFO L78 Accepts]: Start accepts. Automaton has 598 states and 628 transitions. Word has length 263 [2020-09-04 23:11:29,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:29,620 INFO L479 AbstractCegarLoop]: Abstraction has 598 states and 628 transitions. [2020-09-04 23:11:29,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-09-04 23:11:29,620 INFO L276 IsEmpty]: Start isEmpty. Operand 598 states and 628 transitions. [2020-09-04 23:11:29,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2020-09-04 23:11:29,623 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:29,623 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] [2020-09-04 23:11:29,623 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-09-04 23:11:29,623 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:29,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:29,624 INFO L82 PathProgramCache]: Analyzing trace with hash 93968705, now seen corresponding path program 5 times [2020-09-04 23:11:29,624 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:29,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [894729550] [2020-09-04 23:11:29,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:29,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:30,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:30,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:30,232 INFO L134 CoverageAnalysis]: Checked inductivity of 603 backedges. 108 proven. 134 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2020-09-04 23:11:30,232 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [894729550] [2020-09-04 23:11:30,232 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:30,232 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-09-04 23:11:30,233 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458055248] [2020-09-04 23:11:30,234 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-09-04 23:11:30,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:30,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-09-04 23:11:30,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=785, Unknown=0, NotChecked=0, Total=930 [2020-09-04 23:11:30,235 INFO L87 Difference]: Start difference. First operand 598 states and 628 transitions. Second operand 31 states. [2020-09-04 23:11:33,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:33,561 INFO L93 Difference]: Finished difference Result 1232 states and 1311 transitions. [2020-09-04 23:11:33,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2020-09-04 23:11:33,562 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 269 [2020-09-04 23:11:33,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:33,565 INFO L225 Difference]: With dead ends: 1232 [2020-09-04 23:11:33,565 INFO L226 Difference]: Without dead ends: 1093 [2020-09-04 23:11:33,567 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3701 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2406, Invalid=9366, Unknown=0, NotChecked=0, Total=11772 [2020-09-04 23:11:33,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1093 states. [2020-09-04 23:11:33,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1093 to 604. [2020-09-04 23:11:33,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 604 states. [2020-09-04 23:11:33,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 604 states to 604 states and 634 transitions. [2020-09-04 23:11:33,714 INFO L78 Accepts]: Start accepts. Automaton has 604 states and 634 transitions. Word has length 269 [2020-09-04 23:11:33,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:33,714 INFO L479 AbstractCegarLoop]: Abstraction has 604 states and 634 transitions. [2020-09-04 23:11:33,714 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-09-04 23:11:33,715 INFO L276 IsEmpty]: Start isEmpty. Operand 604 states and 634 transitions. [2020-09-04 23:11:33,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2020-09-04 23:11:33,717 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:33,717 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] [2020-09-04 23:11:33,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-09-04 23:11:33,718 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:33,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:33,718 INFO L82 PathProgramCache]: Analyzing trace with hash 1192872249, now seen corresponding path program 6 times [2020-09-04 23:11:33,718 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:33,718 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1807185100] [2020-09-04 23:11:33,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:33,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:34,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:34,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:34,272 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 206 proven. 140 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2020-09-04 23:11:34,272 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1807185100] [2020-09-04 23:11:34,272 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:34,272 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-09-04 23:11:34,272 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266792403] [2020-09-04 23:11:34,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-09-04 23:11:34,273 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:34,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-09-04 23:11:34,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=707, Unknown=0, NotChecked=0, Total=812 [2020-09-04 23:11:34,273 INFO L87 Difference]: Start difference. First operand 604 states and 634 transitions. Second operand 29 states. [2020-09-04 23:11:39,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:39,094 INFO L93 Difference]: Finished difference Result 1330 states and 1408 transitions. [2020-09-04 23:11:39,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2020-09-04 23:11:39,095 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 269 [2020-09-04 23:11:39,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:39,099 INFO L225 Difference]: With dead ends: 1330 [2020-09-04 23:11:39,099 INFO L226 Difference]: Without dead ends: 1198 [2020-09-04 23:11:39,104 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5459 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2146, Invalid=13856, Unknown=0, NotChecked=0, Total=16002 [2020-09-04 23:11:39,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1198 states. [2020-09-04 23:11:39,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1198 to 680. [2020-09-04 23:11:39,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 680 states. [2020-09-04 23:11:39,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 680 states to 680 states and 716 transitions. [2020-09-04 23:11:39,267 INFO L78 Accepts]: Start accepts. Automaton has 680 states and 716 transitions. Word has length 269 [2020-09-04 23:11:39,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:39,268 INFO L479 AbstractCegarLoop]: Abstraction has 680 states and 716 transitions. [2020-09-04 23:11:39,268 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-09-04 23:11:39,268 INFO L276 IsEmpty]: Start isEmpty. Operand 680 states and 716 transitions. [2020-09-04 23:11:39,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2020-09-04 23:11:39,270 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:39,271 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] [2020-09-04 23:11:39,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-09-04 23:11:39,271 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:39,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:39,272 INFO L82 PathProgramCache]: Analyzing trace with hash -1541831375, now seen corresponding path program 7 times [2020-09-04 23:11:39,272 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:39,272 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [389403200] [2020-09-04 23:11:39,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:39,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:39,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:39,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:39,849 INFO L134 CoverageAnalysis]: Checked inductivity of 653 backedges. 230 proven. 154 refuted. 0 times theorem prover too weak. 269 trivial. 0 not checked. [2020-09-04 23:11:39,849 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [389403200] [2020-09-04 23:11:39,849 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:39,849 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-09-04 23:11:39,850 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411815111] [2020-09-04 23:11:39,850 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-09-04 23:11:39,850 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:39,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-09-04 23:11:39,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=665, Unknown=0, NotChecked=0, Total=756 [2020-09-04 23:11:39,851 INFO L87 Difference]: Start difference. First operand 680 states and 716 transitions. Second operand 28 states. [2020-09-04 23:11:41,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:41,918 INFO L93 Difference]: Finished difference Result 834 states and 879 transitions. [2020-09-04 23:11:41,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-09-04 23:11:41,919 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 269 [2020-09-04 23:11:41,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:41,922 INFO L225 Difference]: With dead ends: 834 [2020-09-04 23:11:41,923 INFO L226 Difference]: Without dead ends: 624 [2020-09-04 23:11:41,924 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1052 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=597, Invalid=3435, Unknown=0, NotChecked=0, Total=4032 [2020-09-04 23:11:41,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 624 states. [2020-09-04 23:11:42,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 624 to 624. [2020-09-04 23:11:42,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 624 states. [2020-09-04 23:11:42,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 624 states to 624 states and 658 transitions. [2020-09-04 23:11:42,042 INFO L78 Accepts]: Start accepts. Automaton has 624 states and 658 transitions. Word has length 269 [2020-09-04 23:11:42,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:42,043 INFO L479 AbstractCegarLoop]: Abstraction has 624 states and 658 transitions. [2020-09-04 23:11:42,043 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-09-04 23:11:42,043 INFO L276 IsEmpty]: Start isEmpty. Operand 624 states and 658 transitions. [2020-09-04 23:11:42,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2020-09-04 23:11:42,045 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:42,046 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] [2020-09-04 23:11:42,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-09-04 23:11:42,046 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:42,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:42,046 INFO L82 PathProgramCache]: Analyzing trace with hash -2027730327, now seen corresponding path program 8 times [2020-09-04 23:11:42,047 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:42,047 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1540886745] [2020-09-04 23:11:42,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:42,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:42,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:42,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:42,823 INFO L134 CoverageAnalysis]: Checked inductivity of 641 backedges. 112 proven. 239 refuted. 0 times theorem prover too weak. 290 trivial. 0 not checked. [2020-09-04 23:11:42,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1540886745] [2020-09-04 23:11:42,824 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:42,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-09-04 23:11:42,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700667220] [2020-09-04 23:11:42,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-09-04 23:11:42,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:42,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-09-04 23:11:42,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1049, Unknown=0, NotChecked=0, Total=1190 [2020-09-04 23:11:42,825 INFO L87 Difference]: Start difference. First operand 624 states and 658 transitions. Second operand 35 states. [2020-09-04 23:11:46,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:46,065 INFO L93 Difference]: Finished difference Result 1014 states and 1076 transitions. [2020-09-04 23:11:46,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-09-04 23:11:46,065 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 275 [2020-09-04 23:11:46,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:46,070 INFO L225 Difference]: With dead ends: 1014 [2020-09-04 23:11:46,070 INFO L226 Difference]: Without dead ends: 1008 [2020-09-04 23:11:46,071 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1485 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1241, Invalid=5565, Unknown=0, NotChecked=0, Total=6806 [2020-09-04 23:11:46,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1008 states. [2020-09-04 23:11:46,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1008 to 761. [2020-09-04 23:11:46,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 761 states. [2020-09-04 23:11:46,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 761 states to 761 states and 806 transitions. [2020-09-04 23:11:46,248 INFO L78 Accepts]: Start accepts. Automaton has 761 states and 806 transitions. Word has length 275 [2020-09-04 23:11:46,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:46,248 INFO L479 AbstractCegarLoop]: Abstraction has 761 states and 806 transitions. [2020-09-04 23:11:46,249 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-09-04 23:11:46,249 INFO L276 IsEmpty]: Start isEmpty. Operand 761 states and 806 transitions. [2020-09-04 23:11:46,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2020-09-04 23:11:46,251 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:46,252 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] [2020-09-04 23:11:46,252 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-09-04 23:11:46,252 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:46,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:46,252 INFO L82 PathProgramCache]: Analyzing trace with hash 611624193, now seen corresponding path program 9 times [2020-09-04 23:11:46,253 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:46,253 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [630941233] [2020-09-04 23:11:46,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:46,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:46,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:46,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:46,995 INFO L134 CoverageAnalysis]: Checked inductivity of 642 backedges. 202 proven. 188 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2020-09-04 23:11:46,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [630941233] [2020-09-04 23:11:46,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:46,995 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-09-04 23:11:46,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751003608] [2020-09-04 23:11:46,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-09-04 23:11:46,996 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:46,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-09-04 23:11:46,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=923, Unknown=0, NotChecked=0, Total=1056 [2020-09-04 23:11:46,997 INFO L87 Difference]: Start difference. First operand 761 states and 806 transitions. Second operand 33 states. [2020-09-04 23:11:54,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:54,246 INFO L93 Difference]: Finished difference Result 1593 states and 1688 transitions. [2020-09-04 23:11:54,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 161 states. [2020-09-04 23:11:54,247 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 275 [2020-09-04 23:11:54,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:54,252 INFO L225 Difference]: With dead ends: 1593 [2020-09-04 23:11:54,252 INFO L226 Difference]: Without dead ends: 1452 [2020-09-04 23:11:54,254 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12564 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=4283, Invalid=28659, Unknown=0, NotChecked=0, Total=32942 [2020-09-04 23:11:54,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1452 states. [2020-09-04 23:11:54,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1452 to 797. [2020-09-04 23:11:54,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 797 states. [2020-09-04 23:11:54,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 797 states to 797 states and 844 transitions. [2020-09-04 23:11:54,469 INFO L78 Accepts]: Start accepts. Automaton has 797 states and 844 transitions. Word has length 275 [2020-09-04 23:11:54,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:54,470 INFO L479 AbstractCegarLoop]: Abstraction has 797 states and 844 transitions. [2020-09-04 23:11:54,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-09-04 23:11:54,470 INFO L276 IsEmpty]: Start isEmpty. Operand 797 states and 844 transitions. [2020-09-04 23:11:54,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2020-09-04 23:11:54,472 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:54,473 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] [2020-09-04 23:11:54,473 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-09-04 23:11:54,473 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:54,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:54,474 INFO L82 PathProgramCache]: Analyzing trace with hash -2123079431, now seen corresponding path program 10 times [2020-09-04 23:11:54,474 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:54,474 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [402351466] [2020-09-04 23:11:54,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:54,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:55,030 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:55,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:55,104 INFO L134 CoverageAnalysis]: Checked inductivity of 673 backedges. 230 proven. 174 refuted. 0 times theorem prover too weak. 269 trivial. 0 not checked. [2020-09-04 23:11:55,104 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [402351466] [2020-09-04 23:11:55,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:55,105 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-09-04 23:11:55,105 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346763123] [2020-09-04 23:11:55,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-09-04 23:11:55,106 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:55,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-09-04 23:11:55,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=768, Unknown=0, NotChecked=0, Total=870 [2020-09-04 23:11:55,106 INFO L87 Difference]: Start difference. First operand 797 states and 844 transitions. Second operand 30 states. [2020-09-04 23:11:58,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:11:58,110 INFO L93 Difference]: Finished difference Result 1115 states and 1179 transitions. [2020-09-04 23:11:58,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-09-04 23:11:58,111 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 275 [2020-09-04 23:11:58,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:11:58,115 INFO L225 Difference]: With dead ends: 1115 [2020-09-04 23:11:58,115 INFO L226 Difference]: Without dead ends: 697 [2020-09-04 23:11:58,117 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1774 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=970, Invalid=5510, Unknown=0, NotChecked=0, Total=6480 [2020-09-04 23:11:58,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 697 states. [2020-09-04 23:11:58,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 697 to 697. [2020-09-04 23:11:58,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 697 states. [2020-09-04 23:11:58,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 697 states to 697 states and 738 transitions. [2020-09-04 23:11:58,276 INFO L78 Accepts]: Start accepts. Automaton has 697 states and 738 transitions. Word has length 275 [2020-09-04 23:11:58,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:11:58,277 INFO L479 AbstractCegarLoop]: Abstraction has 697 states and 738 transitions. [2020-09-04 23:11:58,277 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-09-04 23:11:58,277 INFO L276 IsEmpty]: Start isEmpty. Operand 697 states and 738 transitions. [2020-09-04 23:11:58,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 282 [2020-09-04 23:11:58,278 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:11:58,278 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] [2020-09-04 23:11:58,279 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-09-04 23:11:58,279 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:11:58,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:11:58,279 INFO L82 PathProgramCache]: Analyzing trace with hash -1143126335, now seen corresponding path program 11 times [2020-09-04 23:11:58,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:11:58,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [507191362] [2020-09-04 23:11:58,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:11:58,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:59,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:11:59,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:11:59,266 INFO L134 CoverageAnalysis]: Checked inductivity of 699 backedges. 230 proven. 200 refuted. 0 times theorem prover too weak. 269 trivial. 0 not checked. [2020-09-04 23:11:59,266 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [507191362] [2020-09-04 23:11:59,267 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:11:59,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-09-04 23:11:59,267 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059770567] [2020-09-04 23:11:59,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-09-04 23:11:59,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:11:59,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-09-04 23:11:59,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=877, Unknown=0, NotChecked=0, Total=992 [2020-09-04 23:11:59,268 INFO L87 Difference]: Start difference. First operand 697 states and 738 transitions. Second operand 32 states. [2020-09-04 23:12:03,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:12:03,254 INFO L93 Difference]: Finished difference Result 1161 states and 1230 transitions. [2020-09-04 23:12:03,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2020-09-04 23:12:03,254 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 281 [2020-09-04 23:12:03,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:12:03,258 INFO L225 Difference]: With dead ends: 1161 [2020-09-04 23:12:03,258 INFO L226 Difference]: Without dead ends: 577 [2020-09-04 23:12:03,260 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2611 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1404, Invalid=7908, Unknown=0, NotChecked=0, Total=9312 [2020-09-04 23:12:03,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 577 states. [2020-09-04 23:12:03,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 577 to 577. [2020-09-04 23:12:03,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 577 states. [2020-09-04 23:12:03,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 577 states to 577 states and 610 transitions. [2020-09-04 23:12:03,385 INFO L78 Accepts]: Start accepts. Automaton has 577 states and 610 transitions. Word has length 281 [2020-09-04 23:12:03,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:12:03,385 INFO L479 AbstractCegarLoop]: Abstraction has 577 states and 610 transitions. [2020-09-04 23:12:03,385 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-09-04 23:12:03,385 INFO L276 IsEmpty]: Start isEmpty. Operand 577 states and 610 transitions. [2020-09-04 23:12:03,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2020-09-04 23:12:03,386 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:12:03,387 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] [2020-09-04 23:12:03,387 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-09-04 23:12:03,387 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:12:03,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:12:03,388 INFO L82 PathProgramCache]: Analyzing trace with hash -1197805583, now seen corresponding path program 12 times [2020-09-04 23:12:03,388 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:12:03,388 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [960826805] [2020-09-04 23:12:03,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:12:03,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:04,044 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:12:04,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:04,126 INFO L134 CoverageAnalysis]: Checked inductivity of 718 backedges. 263 proven. 165 refuted. 0 times theorem prover too weak. 290 trivial. 0 not checked. [2020-09-04 23:12:04,126 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [960826805] [2020-09-04 23:12:04,127 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:12:04,127 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-09-04 23:12:04,127 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447448554] [2020-09-04 23:12:04,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-09-04 23:12:04,128 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:12:04,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-09-04 23:12:04,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=905, Unknown=0, NotChecked=0, Total=1056 [2020-09-04 23:12:04,128 INFO L87 Difference]: Start difference. First operand 577 states and 610 transitions. Second operand 33 states. [2020-09-04 23:12:08,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:12:08,497 INFO L93 Difference]: Finished difference Result 1377 states and 1463 transitions. [2020-09-04 23:12:08,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2020-09-04 23:12:08,497 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 287 [2020-09-04 23:12:08,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:12:08,501 INFO L225 Difference]: With dead ends: 1377 [2020-09-04 23:12:08,501 INFO L226 Difference]: Without dead ends: 1215 [2020-09-04 23:12:08,502 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3725 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1878, Invalid=10554, Unknown=0, NotChecked=0, Total=12432 [2020-09-04 23:12:08,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1215 states. [2020-09-04 23:12:08,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1215 to 685. [2020-09-04 23:12:08,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 685 states. [2020-09-04 23:12:08,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 685 states to 685 states and 725 transitions. [2020-09-04 23:12:08,683 INFO L78 Accepts]: Start accepts. Automaton has 685 states and 725 transitions. Word has length 287 [2020-09-04 23:12:08,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:12:08,683 INFO L479 AbstractCegarLoop]: Abstraction has 685 states and 725 transitions. [2020-09-04 23:12:08,683 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-09-04 23:12:08,683 INFO L276 IsEmpty]: Start isEmpty. Operand 685 states and 725 transitions. [2020-09-04 23:12:08,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2020-09-04 23:12:08,685 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:12:08,685 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] [2020-09-04 23:12:08,685 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-09-04 23:12:08,686 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:12:08,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:12:08,686 INFO L82 PathProgramCache]: Analyzing trace with hash -819677559, now seen corresponding path program 13 times [2020-09-04 23:12:08,686 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:12:08,686 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1204205961] [2020-09-04 23:12:08,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:12:08,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:09,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:12:09,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:09,544 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 214 proven. 260 refuted. 0 times theorem prover too weak. 257 trivial. 0 not checked. [2020-09-04 23:12:09,545 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1204205961] [2020-09-04 23:12:09,545 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:12:09,545 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-09-04 23:12:09,545 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96080171] [2020-09-04 23:12:09,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-09-04 23:12:09,546 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:12:09,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-09-04 23:12:09,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1117, Unknown=0, NotChecked=0, Total=1260 [2020-09-04 23:12:09,547 INFO L87 Difference]: Start difference. First operand 685 states and 725 transitions. Second operand 36 states. [2020-09-04 23:12:14,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:12:14,671 INFO L93 Difference]: Finished difference Result 1226 states and 1299 transitions. [2020-09-04 23:12:14,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2020-09-04 23:12:14,672 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 287 [2020-09-04 23:12:14,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:12:14,674 INFO L225 Difference]: With dead ends: 1226 [2020-09-04 23:12:14,674 INFO L226 Difference]: Without dead ends: 444 [2020-09-04 23:12:14,676 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3802 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=1930, Invalid=11180, Unknown=0, NotChecked=0, Total=13110 [2020-09-04 23:12:14,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 444 states. [2020-09-04 23:12:14,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 444 to 444. [2020-09-04 23:12:14,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 444 states. [2020-09-04 23:12:14,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 444 states to 444 states and 466 transitions. [2020-09-04 23:12:14,758 INFO L78 Accepts]: Start accepts. Automaton has 444 states and 466 transitions. Word has length 287 [2020-09-04 23:12:14,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:12:14,758 INFO L479 AbstractCegarLoop]: Abstraction has 444 states and 466 transitions. [2020-09-04 23:12:14,758 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-09-04 23:12:14,759 INFO L276 IsEmpty]: Start isEmpty. Operand 444 states and 466 transitions. [2020-09-04 23:12:14,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 294 [2020-09-04 23:12:14,760 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:12:14,761 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] [2020-09-04 23:12:14,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-09-04 23:12:14,761 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:12:14,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:12:14,761 INFO L82 PathProgramCache]: Analyzing trace with hash 573663673, now seen corresponding path program 14 times [2020-09-04 23:12:14,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:12:14,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [233586230] [2020-09-04 23:12:14,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:12:14,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:15,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:12:15,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:15,659 INFO L134 CoverageAnalysis]: Checked inductivity of 762 backedges. 147 proven. 177 refuted. 0 times theorem prover too weak. 438 trivial. 0 not checked. [2020-09-04 23:12:15,659 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [233586230] [2020-09-04 23:12:15,659 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:12:15,659 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-09-04 23:12:15,660 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440397430] [2020-09-04 23:12:15,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-09-04 23:12:15,660 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:12:15,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-09-04 23:12:15,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=1009, Unknown=0, NotChecked=0, Total=1190 [2020-09-04 23:12:15,661 INFO L87 Difference]: Start difference. First operand 444 states and 466 transitions. Second operand 35 states. [2020-09-04 23:12:18,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:12:18,477 INFO L93 Difference]: Finished difference Result 753 states and 799 transitions. [2020-09-04 23:12:18,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2020-09-04 23:12:18,478 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 293 [2020-09-04 23:12:18,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:12:18,482 INFO L225 Difference]: With dead ends: 753 [2020-09-04 23:12:18,482 INFO L226 Difference]: Without dead ends: 602 [2020-09-04 23:12:18,483 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2274 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1588, Invalid=6602, Unknown=0, NotChecked=0, Total=8190 [2020-09-04 23:12:18,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 602 states. [2020-09-04 23:12:18,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 602 to 450. [2020-09-04 23:12:18,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 450 states. [2020-09-04 23:12:18,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 450 states to 450 states and 472 transitions. [2020-09-04 23:12:18,573 INFO L78 Accepts]: Start accepts. Automaton has 450 states and 472 transitions. Word has length 293 [2020-09-04 23:12:18,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:12:18,573 INFO L479 AbstractCegarLoop]: Abstraction has 450 states and 472 transitions. [2020-09-04 23:12:18,573 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-09-04 23:12:18,574 INFO L276 IsEmpty]: Start isEmpty. Operand 450 states and 472 transitions. [2020-09-04 23:12:18,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-09-04 23:12:18,575 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:12:18,575 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] [2020-09-04 23:12:18,575 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-09-04 23:12:18,575 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:12:18,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:12:18,576 INFO L82 PathProgramCache]: Analyzing trace with hash 681536225, now seen corresponding path program 15 times [2020-09-04 23:12:18,576 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:12:18,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1323697799] [2020-09-04 23:12:18,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:12:18,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:19,573 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:12:19,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:19,631 INFO L134 CoverageAnalysis]: Checked inductivity of 806 backedges. 151 proven. 321 refuted. 0 times theorem prover too weak. 334 trivial. 0 not checked. [2020-09-04 23:12:19,631 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1323697799] [2020-09-04 23:12:19,631 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:12:19,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-09-04 23:12:19,632 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512444204] [2020-09-04 23:12:19,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-09-04 23:12:19,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:12:19,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-09-04 23:12:19,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=1307, Unknown=0, NotChecked=0, Total=1482 [2020-09-04 23:12:19,632 INFO L87 Difference]: Start difference. First operand 450 states and 472 transitions. Second operand 39 states. [2020-09-04 23:12:23,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:12:23,088 INFO L93 Difference]: Finished difference Result 642 states and 677 transitions. [2020-09-04 23:12:23,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-09-04 23:12:23,089 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 299 [2020-09-04 23:12:23,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:12:23,093 INFO L225 Difference]: With dead ends: 642 [2020-09-04 23:12:23,093 INFO L226 Difference]: Without dead ends: 636 [2020-09-04 23:12:23,094 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1834 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1497, Invalid=6693, Unknown=0, NotChecked=0, Total=8190 [2020-09-04 23:12:23,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 636 states. [2020-09-04 23:12:23,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 636 to 603. [2020-09-04 23:12:23,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 603 states. [2020-09-04 23:12:23,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 603 states to 603 states and 638 transitions. [2020-09-04 23:12:23,244 INFO L78 Accepts]: Start accepts. Automaton has 603 states and 638 transitions. Word has length 299 [2020-09-04 23:12:23,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:12:23,244 INFO L479 AbstractCegarLoop]: Abstraction has 603 states and 638 transitions. [2020-09-04 23:12:23,244 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-09-04 23:12:23,244 INFO L276 IsEmpty]: Start isEmpty. Operand 603 states and 638 transitions. [2020-09-04 23:12:23,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-09-04 23:12:23,246 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:12:23,246 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] [2020-09-04 23:12:23,246 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-09-04 23:12:23,246 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:12:23,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:12:23,247 INFO L82 PathProgramCache]: Analyzing trace with hash -1406527111, now seen corresponding path program 16 times [2020-09-04 23:12:23,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:12:23,247 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2126210111] [2020-09-04 23:12:23,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:12:23,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:24,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:12:24,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:24,497 INFO L134 CoverageAnalysis]: Checked inductivity of 807 backedges. 275 proven. 242 refuted. 0 times theorem prover too weak. 290 trivial. 0 not checked. [2020-09-04 23:12:24,497 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2126210111] [2020-09-04 23:12:24,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:12:24,498 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-09-04 23:12:24,498 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732900746] [2020-09-04 23:12:24,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-09-04 23:12:24,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:12:24,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-09-04 23:12:24,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=1167, Unknown=0, NotChecked=0, Total=1332 [2020-09-04 23:12:24,500 INFO L87 Difference]: Start difference. First operand 603 states and 638 transitions. Second operand 37 states. [2020-09-04 23:12:30,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:12:30,157 INFO L93 Difference]: Finished difference Result 1132 states and 1201 transitions. [2020-09-04 23:12:30,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2020-09-04 23:12:30,158 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 299 [2020-09-04 23:12:30,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:12:30,164 INFO L225 Difference]: With dead ends: 1132 [2020-09-04 23:12:30,165 INFO L226 Difference]: Without dead ends: 970 [2020-09-04 23:12:30,166 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3921 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=1949, Invalid=11623, Unknown=0, NotChecked=0, Total=13572 [2020-09-04 23:12:30,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 970 states. [2020-09-04 23:12:30,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 970 to 651. [2020-09-04 23:12:30,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 651 states. [2020-09-04 23:12:30,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 651 states to 651 states and 689 transitions. [2020-09-04 23:12:30,357 INFO L78 Accepts]: Start accepts. Automaton has 651 states and 689 transitions. Word has length 299 [2020-09-04 23:12:30,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:12:30,357 INFO L479 AbstractCegarLoop]: Abstraction has 651 states and 689 transitions. [2020-09-04 23:12:30,358 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-09-04 23:12:30,358 INFO L276 IsEmpty]: Start isEmpty. Operand 651 states and 689 transitions. [2020-09-04 23:12:30,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 312 [2020-09-04 23:12:30,359 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:12:30,359 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] [2020-09-04 23:12:30,359 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-09-04 23:12:30,359 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:12:30,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:12:30,360 INFO L82 PathProgramCache]: Analyzing trace with hash 777133161, now seen corresponding path program 17 times [2020-09-04 23:12:30,360 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:12:30,360 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [111601506] [2020-09-04 23:12:30,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:12:30,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:31,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:12:31,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:31,353 INFO L134 CoverageAnalysis]: Checked inductivity of 895 backedges. 348 proven. 213 refuted. 0 times theorem prover too weak. 334 trivial. 0 not checked. [2020-09-04 23:12:31,353 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [111601506] [2020-09-04 23:12:31,353 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:12:31,354 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-09-04 23:12:31,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670733275] [2020-09-04 23:12:31,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-09-04 23:12:31,354 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:12:31,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-09-04 23:12:31,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=1145, Unknown=0, NotChecked=0, Total=1332 [2020-09-04 23:12:31,355 INFO L87 Difference]: Start difference. First operand 651 states and 689 transitions. Second operand 37 states. [2020-09-04 23:12:37,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:12:37,345 INFO L93 Difference]: Finished difference Result 1611 states and 1714 transitions. [2020-09-04 23:12:37,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2020-09-04 23:12:37,346 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 311 [2020-09-04 23:12:37,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:12:37,351 INFO L225 Difference]: With dead ends: 1611 [2020-09-04 23:12:37,351 INFO L226 Difference]: Without dead ends: 1428 [2020-09-04 23:12:37,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5121 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=2518, Invalid=14252, Unknown=0, NotChecked=0, Total=16770 [2020-09-04 23:12:37,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1428 states. [2020-09-04 23:12:37,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1428 to 785. [2020-09-04 23:12:37,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 785 states. [2020-09-04 23:12:37,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 785 states to 785 states and 832 transitions. [2020-09-04 23:12:37,600 INFO L78 Accepts]: Start accepts. Automaton has 785 states and 832 transitions. Word has length 311 [2020-09-04 23:12:37,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:12:37,601 INFO L479 AbstractCegarLoop]: Abstraction has 785 states and 832 transitions. [2020-09-04 23:12:37,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-09-04 23:12:37,601 INFO L276 IsEmpty]: Start isEmpty. Operand 785 states and 832 transitions. [2020-09-04 23:12:37,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 312 [2020-09-04 23:12:37,603 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:12:37,603 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] [2020-09-04 23:12:37,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-09-04 23:12:37,603 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:12:37,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:12:37,603 INFO L82 PathProgramCache]: Analyzing trace with hash 1927231233, now seen corresponding path program 18 times [2020-09-04 23:12:37,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:12:37,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1523576838] [2020-09-04 23:12:37,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:12:37,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:38,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:12:38,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:38,749 INFO L134 CoverageAnalysis]: Checked inductivity of 908 backedges. 287 proven. 326 refuted. 0 times theorem prover too weak. 295 trivial. 0 not checked. [2020-09-04 23:12:38,750 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1523576838] [2020-09-04 23:12:38,750 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:12:38,750 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-09-04 23:12:38,750 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355079769] [2020-09-04 23:12:38,751 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-09-04 23:12:38,751 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:12:38,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-09-04 23:12:38,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=1385, Unknown=0, NotChecked=0, Total=1560 [2020-09-04 23:12:38,752 INFO L87 Difference]: Start difference. First operand 785 states and 832 transitions. Second operand 40 states. [2020-09-04 23:12:45,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:12:45,861 INFO L93 Difference]: Finished difference Result 1484 states and 1576 transitions. [2020-09-04 23:12:45,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2020-09-04 23:12:45,862 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 311 [2020-09-04 23:12:45,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:12:45,865 INFO L225 Difference]: With dead ends: 1484 [2020-09-04 23:12:45,865 INFO L226 Difference]: Without dead ends: 494 [2020-09-04 23:12:45,868 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5219 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=2537, Invalid=15019, Unknown=0, NotChecked=0, Total=17556 [2020-09-04 23:12:45,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 494 states. [2020-09-04 23:12:45,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 494 to 494. [2020-09-04 23:12:45,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 494 states. [2020-09-04 23:12:45,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 494 states to 494 states and 519 transitions. [2020-09-04 23:12:45,986 INFO L78 Accepts]: Start accepts. Automaton has 494 states and 519 transitions. Word has length 311 [2020-09-04 23:12:45,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:12:45,986 INFO L479 AbstractCegarLoop]: Abstraction has 494 states and 519 transitions. [2020-09-04 23:12:45,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-09-04 23:12:45,986 INFO L276 IsEmpty]: Start isEmpty. Operand 494 states and 519 transitions. [2020-09-04 23:12:45,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 318 [2020-09-04 23:12:45,988 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:12:45,988 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] [2020-09-04 23:12:45,988 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-09-04 23:12:45,988 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:12:45,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:12:45,988 INFO L82 PathProgramCache]: Analyzing trace with hash -804667855, now seen corresponding path program 19 times [2020-09-04 23:12:45,989 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:12:45,989 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [761478598] [2020-09-04 23:12:45,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:12:46,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:47,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:12:47,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:47,089 INFO L134 CoverageAnalysis]: Checked inductivity of 945 backedges. 192 proven. 226 refuted. 0 times theorem prover too weak. 527 trivial. 0 not checked. [2020-09-04 23:12:47,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [761478598] [2020-09-04 23:12:47,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:12:47,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-09-04 23:12:47,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699795558] [2020-09-04 23:12:47,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-09-04 23:12:47,091 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:12:47,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-09-04 23:12:47,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=1261, Unknown=0, NotChecked=0, Total=1482 [2020-09-04 23:12:47,091 INFO L87 Difference]: Start difference. First operand 494 states and 519 transitions. Second operand 39 states. [2020-09-04 23:12:50,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:12:50,770 INFO L93 Difference]: Finished difference Result 827 states and 878 transitions. [2020-09-04 23:12:50,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2020-09-04 23:12:50,771 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 317 [2020-09-04 23:12:50,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:12:50,773 INFO L225 Difference]: With dead ends: 827 [2020-09-04 23:12:50,773 INFO L226 Difference]: Without dead ends: 664 [2020-09-04 23:12:50,775 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2986 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2033, Invalid=8473, Unknown=0, NotChecked=0, Total=10506 [2020-09-04 23:12:50,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 664 states. [2020-09-04 23:12:50,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 664 to 500. [2020-09-04 23:12:50,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 500 states. [2020-09-04 23:12:50,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 500 states to 500 states and 525 transitions. [2020-09-04 23:12:50,888 INFO L78 Accepts]: Start accepts. Automaton has 500 states and 525 transitions. Word has length 317 [2020-09-04 23:12:50,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:12:50,889 INFO L479 AbstractCegarLoop]: Abstraction has 500 states and 525 transitions. [2020-09-04 23:12:50,889 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-09-04 23:12:50,889 INFO L276 IsEmpty]: Start isEmpty. Operand 500 states and 525 transitions. [2020-09-04 23:12:50,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 324 [2020-09-04 23:12:50,891 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:12:50,891 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] [2020-09-04 23:12:50,891 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-09-04 23:12:50,891 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:12:50,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:12:50,891 INFO L82 PathProgramCache]: Analyzing trace with hash -572895399, now seen corresponding path program 20 times [2020-09-04 23:12:50,891 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:12:50,892 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2095419564] [2020-09-04 23:12:50,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:12:50,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:52,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:12:52,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:52,272 INFO L134 CoverageAnalysis]: Checked inductivity of 995 backedges. 196 proven. 415 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2020-09-04 23:12:52,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2095419564] [2020-09-04 23:12:52,273 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:12:52,273 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-09-04 23:12:52,273 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010971777] [2020-09-04 23:12:52,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-09-04 23:12:52,273 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:12:52,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-09-04 23:12:52,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=1593, Unknown=0, NotChecked=0, Total=1806 [2020-09-04 23:12:52,274 INFO L87 Difference]: Start difference. First operand 500 states and 525 transitions. Second operand 43 states. [2020-09-04 23:12:56,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:12:56,845 INFO L93 Difference]: Finished difference Result 708 states and 747 transitions. [2020-09-04 23:12:56,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2020-09-04 23:12:56,846 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 323 [2020-09-04 23:12:56,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:12:56,848 INFO L225 Difference]: With dead ends: 708 [2020-09-04 23:12:56,848 INFO L226 Difference]: Without dead ends: 702 [2020-09-04 23:12:56,849 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2294 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=1860, Invalid=8240, Unknown=0, NotChecked=0, Total=10100 [2020-09-04 23:12:56,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 702 states. [2020-09-04 23:12:57,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 702 to 665. [2020-09-04 23:12:57,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 665 states. [2020-09-04 23:12:57,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 665 states to 665 states and 704 transitions. [2020-09-04 23:12:57,033 INFO L78 Accepts]: Start accepts. Automaton has 665 states and 704 transitions. Word has length 323 [2020-09-04 23:12:57,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:12:57,033 INFO L479 AbstractCegarLoop]: Abstraction has 665 states and 704 transitions. [2020-09-04 23:12:57,034 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-09-04 23:12:57,034 INFO L276 IsEmpty]: Start isEmpty. Operand 665 states and 704 transitions. [2020-09-04 23:12:57,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 324 [2020-09-04 23:12:57,035 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:12:57,035 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] [2020-09-04 23:12:57,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-09-04 23:12:57,036 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:12:57,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:12:57,036 INFO L82 PathProgramCache]: Analyzing trace with hash -183348751, now seen corresponding path program 21 times [2020-09-04 23:12:57,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:12:57,036 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1131041888] [2020-09-04 23:12:57,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:12:57,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:58,208 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:12:58,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:12:58,279 INFO L134 CoverageAnalysis]: Checked inductivity of 996 backedges. 360 proven. 302 refuted. 0 times theorem prover too weak. 334 trivial. 0 not checked. [2020-09-04 23:12:58,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1131041888] [2020-09-04 23:12:58,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:12:58,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-09-04 23:12:58,279 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047039288] [2020-09-04 23:12:58,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-09-04 23:12:58,280 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:12:58,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-09-04 23:12:58,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=1439, Unknown=0, NotChecked=0, Total=1640 [2020-09-04 23:12:58,280 INFO L87 Difference]: Start difference. First operand 665 states and 704 transitions. Second operand 41 states. [2020-09-04 23:13:04,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:13:04,899 INFO L93 Difference]: Finished difference Result 1317 states and 1399 transitions. [2020-09-04 23:13:04,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2020-09-04 23:13:04,901 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 323 [2020-09-04 23:13:04,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:13:04,906 INFO L225 Difference]: With dead ends: 1317 [2020-09-04 23:13:04,906 INFO L226 Difference]: Without dead ends: 1134 [2020-09-04 23:13:04,907 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5165 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=2496, Invalid=15060, Unknown=0, NotChecked=0, Total=17556 [2020-09-04 23:13:04,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1134 states. [2020-09-04 23:13:05,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1134 to 725. [2020-09-04 23:13:05,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 725 states. [2020-09-04 23:13:05,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 725 states to 725 states and 768 transitions. [2020-09-04 23:13:05,165 INFO L78 Accepts]: Start accepts. Automaton has 725 states and 768 transitions. Word has length 323 [2020-09-04 23:13:05,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:13:05,165 INFO L479 AbstractCegarLoop]: Abstraction has 725 states and 768 transitions. [2020-09-04 23:13:05,165 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-09-04 23:13:05,166 INFO L276 IsEmpty]: Start isEmpty. Operand 725 states and 768 transitions. [2020-09-04 23:13:05,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2020-09-04 23:13:05,168 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:13:05,168 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] [2020-09-04 23:13:05,168 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-09-04 23:13:05,168 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:13:05,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:13:05,169 INFO L82 PathProgramCache]: Analyzing trace with hash 1539443937, now seen corresponding path program 22 times [2020-09-04 23:13:05,169 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:13:05,169 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2120966629] [2020-09-04 23:13:05,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:13:05,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:13:06,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:13:06,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:13:06,406 INFO L134 CoverageAnalysis]: Checked inductivity of 1096 backedges. 445 proven. 267 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2020-09-04 23:13:06,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2120966629] [2020-09-04 23:13:06,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:13:06,407 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-09-04 23:13:06,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2109100199] [2020-09-04 23:13:06,407 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-09-04 23:13:06,407 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:13:06,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-09-04 23:13:06,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=1413, Unknown=0, NotChecked=0, Total=1640 [2020-09-04 23:13:06,408 INFO L87 Difference]: Start difference. First operand 725 states and 768 transitions. Second operand 41 states. [2020-09-04 23:13:14,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:13:14,565 INFO L93 Difference]: Finished difference Result 1857 states and 1978 transitions. [2020-09-04 23:13:14,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2020-09-04 23:13:14,567 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 335 [2020-09-04 23:13:14,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:13:14,574 INFO L225 Difference]: With dead ends: 1857 [2020-09-04 23:13:14,574 INFO L226 Difference]: Without dead ends: 1653 [2020-09-04 23:13:14,578 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6733 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=3253, Invalid=18503, Unknown=0, NotChecked=0, Total=21756 [2020-09-04 23:13:14,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1653 states. [2020-09-04 23:13:14,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1653 to 885. [2020-09-04 23:13:14,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 885 states. [2020-09-04 23:13:14,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 885 states to 885 states and 939 transitions. [2020-09-04 23:13:14,893 INFO L78 Accepts]: Start accepts. Automaton has 885 states and 939 transitions. Word has length 335 [2020-09-04 23:13:14,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:13:14,893 INFO L479 AbstractCegarLoop]: Abstraction has 885 states and 939 transitions. [2020-09-04 23:13:14,893 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-09-04 23:13:14,893 INFO L276 IsEmpty]: Start isEmpty. Operand 885 states and 939 transitions. [2020-09-04 23:13:14,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2020-09-04 23:13:14,895 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:13:14,896 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] [2020-09-04 23:13:14,896 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-09-04 23:13:14,896 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:13:14,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:13:14,896 INFO L82 PathProgramCache]: Analyzing trace with hash 1908833145, now seen corresponding path program 23 times [2020-09-04 23:13:14,896 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:13:14,897 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [232731252] [2020-09-04 23:13:14,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:13:14,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:13:16,268 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:13:16,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:13:16,347 INFO L134 CoverageAnalysis]: Checked inductivity of 1109 backedges. 372 proven. 398 refuted. 0 times theorem prover too weak. 339 trivial. 0 not checked. [2020-09-04 23:13:16,348 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [232731252] [2020-09-04 23:13:16,348 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:13:16,349 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-09-04 23:13:16,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108205792] [2020-09-04 23:13:16,349 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-09-04 23:13:16,349 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:13:16,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-09-04 23:13:16,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=1681, Unknown=0, NotChecked=0, Total=1892 [2020-09-04 23:13:16,350 INFO L87 Difference]: Start difference. First operand 885 states and 939 transitions. Second operand 44 states. [2020-09-04 23:13:25,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:13:25,625 INFO L93 Difference]: Finished difference Result 1754 states and 1866 transitions. [2020-09-04 23:13:25,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2020-09-04 23:13:25,626 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 335 [2020-09-04 23:13:25,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:13:25,629 INFO L225 Difference]: With dead ends: 1754 [2020-09-04 23:13:25,629 INFO L226 Difference]: Without dead ends: 544 [2020-09-04 23:13:25,632 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6862 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=3225, Invalid=19425, Unknown=0, NotChecked=0, Total=22650 [2020-09-04 23:13:25,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544 states. [2020-09-04 23:13:25,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544 to 544. [2020-09-04 23:13:25,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 544 states. [2020-09-04 23:13:25,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 544 states to 544 states and 572 transitions. [2020-09-04 23:13:25,792 INFO L78 Accepts]: Start accepts. Automaton has 544 states and 572 transitions. Word has length 335 [2020-09-04 23:13:25,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:13:25,792 INFO L479 AbstractCegarLoop]: Abstraction has 544 states and 572 transitions. [2020-09-04 23:13:25,792 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-09-04 23:13:25,792 INFO L276 IsEmpty]: Start isEmpty. Operand 544 states and 572 transitions. [2020-09-04 23:13:25,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 342 [2020-09-04 23:13:25,793 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:13:25,794 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] [2020-09-04 23:13:25,794 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-09-04 23:13:25,794 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:13:25,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:13:25,794 INFO L82 PathProgramCache]: Analyzing trace with hash -1365059927, now seen corresponding path program 24 times [2020-09-04 23:13:25,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:13:25,794 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1813351007] [2020-09-04 23:13:25,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:13:25,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:13:27,177 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:13:27,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:13:27,234 INFO L134 CoverageAnalysis]: Checked inductivity of 1152 backedges. 243 proven. 281 refuted. 0 times theorem prover too weak. 628 trivial. 0 not checked. [2020-09-04 23:13:27,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1813351007] [2020-09-04 23:13:27,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:13:27,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-09-04 23:13:27,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199007146] [2020-09-04 23:13:27,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-09-04 23:13:27,235 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:13:27,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-09-04 23:13:27,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=1541, Unknown=0, NotChecked=0, Total=1806 [2020-09-04 23:13:27,236 INFO L87 Difference]: Start difference. First operand 544 states and 572 transitions. Second operand 43 states. [2020-09-04 23:13:32,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:13:32,157 INFO L93 Difference]: Finished difference Result 901 states and 957 transitions. [2020-09-04 23:13:32,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2020-09-04 23:13:32,159 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 341 [2020-09-04 23:13:32,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:13:32,162 INFO L225 Difference]: With dead ends: 901 [2020-09-04 23:13:32,162 INFO L226 Difference]: Without dead ends: 726 [2020-09-04 23:13:32,164 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3795 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=2533, Invalid=10577, Unknown=0, NotChecked=0, Total=13110 [2020-09-04 23:13:32,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 726 states. [2020-09-04 23:13:32,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 726 to 550. [2020-09-04 23:13:32,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 550 states. [2020-09-04 23:13:32,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 550 states to 550 states and 578 transitions. [2020-09-04 23:13:32,309 INFO L78 Accepts]: Start accepts. Automaton has 550 states and 578 transitions. Word has length 341 [2020-09-04 23:13:32,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:13:32,310 INFO L479 AbstractCegarLoop]: Abstraction has 550 states and 578 transitions. [2020-09-04 23:13:32,310 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-09-04 23:13:32,310 INFO L276 IsEmpty]: Start isEmpty. Operand 550 states and 578 transitions. [2020-09-04 23:13:32,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2020-09-04 23:13:32,312 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:13:32,312 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] [2020-09-04 23:13:32,313 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-09-04 23:13:32,313 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:13:32,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:13:32,313 INFO L82 PathProgramCache]: Analyzing trace with hash -53217327, now seen corresponding path program 25 times [2020-09-04 23:13:32,313 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:13:32,313 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1875022785] [2020-09-04 23:13:32,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:13:32,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:13:34,008 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:13:34,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:13:34,087 INFO L134 CoverageAnalysis]: Checked inductivity of 1208 backedges. 247 proven. 521 refuted. 0 times theorem prover too weak. 440 trivial. 0 not checked. [2020-09-04 23:13:34,087 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1875022785] [2020-09-04 23:13:34,087 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:13:34,087 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-09-04 23:13:34,088 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [515651264] [2020-09-04 23:13:34,088 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-09-04 23:13:34,088 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:13:34,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-09-04 23:13:34,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=1907, Unknown=0, NotChecked=0, Total=2162 [2020-09-04 23:13:34,089 INFO L87 Difference]: Start difference. First operand 550 states and 578 transitions. Second operand 47 states. [2020-09-04 23:13:40,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:13:40,056 INFO L93 Difference]: Finished difference Result 774 states and 817 transitions. [2020-09-04 23:13:40,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2020-09-04 23:13:40,057 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 347 [2020-09-04 23:13:40,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:13:40,067 INFO L225 Difference]: With dead ends: 774 [2020-09-04 23:13:40,068 INFO L226 Difference]: Without dead ends: 768 [2020-09-04 23:13:40,070 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2805 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=2263, Invalid=9947, Unknown=0, NotChecked=0, Total=12210 [2020-09-04 23:13:40,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 768 states. [2020-09-04 23:13:40,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 768 to 727. [2020-09-04 23:13:40,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 727 states. [2020-09-04 23:13:40,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 727 states to 727 states and 770 transitions. [2020-09-04 23:13:40,308 INFO L78 Accepts]: Start accepts. Automaton has 727 states and 770 transitions. Word has length 347 [2020-09-04 23:13:40,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:13:40,308 INFO L479 AbstractCegarLoop]: Abstraction has 727 states and 770 transitions. [2020-09-04 23:13:40,308 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-09-04 23:13:40,308 INFO L276 IsEmpty]: Start isEmpty. Operand 727 states and 770 transitions. [2020-09-04 23:13:40,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2020-09-04 23:13:40,310 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:13:40,310 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] [2020-09-04 23:13:40,310 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-09-04 23:13:40,310 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:13:40,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:13:40,311 INFO L82 PathProgramCache]: Analyzing trace with hash -156414359, now seen corresponding path program 26 times [2020-09-04 23:13:40,311 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:13:40,311 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [943533962] [2020-09-04 23:13:40,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:13:40,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:13:41,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:13:41,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:13:41,937 INFO L134 CoverageAnalysis]: Checked inductivity of 1209 backedges. 457 proven. 368 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2020-09-04 23:13:41,937 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [943533962] [2020-09-04 23:13:41,937 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:13:41,937 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-09-04 23:13:41,937 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417147705] [2020-09-04 23:13:41,938 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-09-04 23:13:41,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:13:41,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-09-04 23:13:41,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=1739, Unknown=0, NotChecked=0, Total=1980 [2020-09-04 23:13:41,939 INFO L87 Difference]: Start difference. First operand 727 states and 770 transitions. Second operand 45 states. [2020-09-04 23:13:51,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:13:51,661 INFO L93 Difference]: Finished difference Result 1514 states and 1610 transitions. [2020-09-04 23:13:51,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2020-09-04 23:13:51,662 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 347 [2020-09-04 23:13:51,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:13:51,669 INFO L225 Difference]: With dead ends: 1514 [2020-09-04 23:13:51,669 INFO L226 Difference]: Without dead ends: 1310 [2020-09-04 23:13:51,671 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6581 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=3111, Invalid=18941, Unknown=0, NotChecked=0, Total=22052 [2020-09-04 23:13:51,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1310 states. [2020-09-04 23:13:51,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1310 to 799. [2020-09-04 23:13:51,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 799 states. [2020-09-04 23:13:51,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 799 states to 799 states and 847 transitions. [2020-09-04 23:13:52,000 INFO L78 Accepts]: Start accepts. Automaton has 799 states and 847 transitions. Word has length 347 [2020-09-04 23:13:52,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:13:52,000 INFO L479 AbstractCegarLoop]: Abstraction has 799 states and 847 transitions. [2020-09-04 23:13:52,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-09-04 23:13:52,000 INFO L276 IsEmpty]: Start isEmpty. Operand 799 states and 847 transitions. [2020-09-04 23:13:52,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 360 [2020-09-04 23:13:52,002 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:13:52,002 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] [2020-09-04 23:13:52,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-09-04 23:13:52,002 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:13:52,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:13:52,003 INFO L82 PathProgramCache]: Analyzing trace with hash -1762999975, now seen corresponding path program 27 times [2020-09-04 23:13:52,003 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:13:52,003 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [863291643] [2020-09-04 23:13:52,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:13:52,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:13:53,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:13:53,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:13:53,791 INFO L134 CoverageAnalysis]: Checked inductivity of 1321 backedges. 554 proven. 327 refuted. 0 times theorem prover too weak. 440 trivial. 0 not checked. [2020-09-04 23:13:53,791 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [863291643] [2020-09-04 23:13:53,791 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:13:53,791 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-09-04 23:13:53,792 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349207098] [2020-09-04 23:13:53,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-09-04 23:13:53,792 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:13:53,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-09-04 23:13:53,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=1709, Unknown=0, NotChecked=0, Total=1980 [2020-09-04 23:13:53,793 INFO L87 Difference]: Start difference. First operand 799 states and 847 transitions. Second operand 45 states. [2020-09-04 23:14:04,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:14:04,347 INFO L93 Difference]: Finished difference Result 2115 states and 2255 transitions. [2020-09-04 23:14:04,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2020-09-04 23:14:04,349 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 359 [2020-09-04 23:14:04,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:14:04,354 INFO L225 Difference]: With dead ends: 2115 [2020-09-04 23:14:04,354 INFO L226 Difference]: Without dead ends: 1890 [2020-09-04 23:14:04,357 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8561 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=4083, Invalid=23307, Unknown=0, NotChecked=0, Total=27390 [2020-09-04 23:14:04,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1890 states. [2020-09-04 23:14:04,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1890 to 985. [2020-09-04 23:14:04,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 985 states. [2020-09-04 23:14:04,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 985 states to 985 states and 1046 transitions. [2020-09-04 23:14:04,871 INFO L78 Accepts]: Start accepts. Automaton has 985 states and 1046 transitions. Word has length 359 [2020-09-04 23:14:04,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:14:04,871 INFO L479 AbstractCegarLoop]: Abstraction has 985 states and 1046 transitions. [2020-09-04 23:14:04,871 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-09-04 23:14:04,872 INFO L276 IsEmpty]: Start isEmpty. Operand 985 states and 1046 transitions. [2020-09-04 23:14:04,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 360 [2020-09-04 23:14:04,873 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:14:04,874 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] [2020-09-04 23:14:04,874 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-09-04 23:14:04,874 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:14:04,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:14:04,875 INFO L82 PathProgramCache]: Analyzing trace with hash -2091219983, now seen corresponding path program 28 times [2020-09-04 23:14:04,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:14:04,875 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1901341053] [2020-09-04 23:14:04,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:14:04,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:14:06,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:14:06,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:14:06,787 INFO L134 CoverageAnalysis]: Checked inductivity of 1334 backedges. 469 proven. 476 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2020-09-04 23:14:06,787 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1901341053] [2020-09-04 23:14:06,787 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:14:06,787 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-09-04 23:14:06,787 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245926205] [2020-09-04 23:14:06,788 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-09-04 23:14:06,788 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:14:06,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-09-04 23:14:06,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=2005, Unknown=0, NotChecked=0, Total=2256 [2020-09-04 23:14:06,789 INFO L87 Difference]: Start difference. First operand 985 states and 1046 transitions. Second operand 48 states. [2020-09-04 23:14:19,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:14:19,430 INFO L93 Difference]: Finished difference Result 2036 states and 2169 transitions. [2020-09-04 23:14:19,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2020-09-04 23:14:19,433 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 359 [2020-09-04 23:14:19,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:14:19,435 INFO L225 Difference]: With dead ends: 2036 [2020-09-04 23:14:19,435 INFO L226 Difference]: Without dead ends: 594 [2020-09-04 23:14:19,439 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8731 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=3994, Invalid=24398, Unknown=0, NotChecked=0, Total=28392 [2020-09-04 23:14:19,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 594 states. [2020-09-04 23:14:19,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 594 to 594. [2020-09-04 23:14:19,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 594 states. [2020-09-04 23:14:19,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 594 states to 594 states and 625 transitions. [2020-09-04 23:14:19,633 INFO L78 Accepts]: Start accepts. Automaton has 594 states and 625 transitions. Word has length 359 [2020-09-04 23:14:19,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:14:19,633 INFO L479 AbstractCegarLoop]: Abstraction has 594 states and 625 transitions. [2020-09-04 23:14:19,633 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-09-04 23:14:19,633 INFO L276 IsEmpty]: Start isEmpty. Operand 594 states and 625 transitions. [2020-09-04 23:14:19,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2020-09-04 23:14:19,635 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:14:19,635 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] [2020-09-04 23:14:19,635 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2020-09-04 23:14:19,635 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:14:19,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:14:19,636 INFO L82 PathProgramCache]: Analyzing trace with hash 2080158497, now seen corresponding path program 29 times [2020-09-04 23:14:19,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:14:19,636 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [307040534] [2020-09-04 23:14:19,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:14:19,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:14:21,579 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:14:21,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:14:21,645 INFO L134 CoverageAnalysis]: Checked inductivity of 1383 backedges. 300 proven. 342 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2020-09-04 23:14:21,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [307040534] [2020-09-04 23:14:21,646 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:14:21,646 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-09-04 23:14:21,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043625179] [2020-09-04 23:14:21,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-09-04 23:14:21,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:14:21,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-09-04 23:14:21,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=1849, Unknown=0, NotChecked=0, Total=2162 [2020-09-04 23:14:21,647 INFO L87 Difference]: Start difference. First operand 594 states and 625 transitions. Second operand 47 states. [2020-09-04 23:14:27,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:14:27,528 INFO L93 Difference]: Finished difference Result 975 states and 1036 transitions. [2020-09-04 23:14:27,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-09-04 23:14:27,530 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 365 [2020-09-04 23:14:27,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:14:27,532 INFO L225 Difference]: With dead ends: 975 [2020-09-04 23:14:27,532 INFO L226 Difference]: Without dead ends: 788 [2020-09-04 23:14:27,534 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4701 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=3088, Invalid=12914, Unknown=0, NotChecked=0, Total=16002 [2020-09-04 23:14:27,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 788 states. [2020-09-04 23:14:27,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 788 to 600. [2020-09-04 23:14:27,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 600 states. [2020-09-04 23:14:27,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 600 states to 600 states and 631 transitions. [2020-09-04 23:14:27,743 INFO L78 Accepts]: Start accepts. Automaton has 600 states and 631 transitions. Word has length 365 [2020-09-04 23:14:27,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:14:27,743 INFO L479 AbstractCegarLoop]: Abstraction has 600 states and 631 transitions. [2020-09-04 23:14:27,743 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-09-04 23:14:27,743 INFO L276 IsEmpty]: Start isEmpty. Operand 600 states and 631 transitions. [2020-09-04 23:14:27,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 372 [2020-09-04 23:14:27,745 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:14:27,745 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] [2020-09-04 23:14:27,745 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2020-09-04 23:14:27,745 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:14:27,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:14:27,746 INFO L82 PathProgramCache]: Analyzing trace with hash 1510761545, now seen corresponding path program 30 times [2020-09-04 23:14:27,746 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:14:27,746 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [268671227] [2020-09-04 23:14:27,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:14:27,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:14:30,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:14:30,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:14:30,125 INFO L134 CoverageAnalysis]: Checked inductivity of 1445 backedges. 304 proven. 639 refuted. 0 times theorem prover too weak. 502 trivial. 0 not checked. [2020-09-04 23:14:30,125 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [268671227] [2020-09-04 23:14:30,125 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:14:30,126 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-09-04 23:14:30,126 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056663272] [2020-09-04 23:14:30,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-09-04 23:14:30,126 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:14:30,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-09-04 23:14:30,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=2249, Unknown=0, NotChecked=0, Total=2550 [2020-09-04 23:14:30,127 INFO L87 Difference]: Start difference. First operand 600 states and 631 transitions. Second operand 51 states. [2020-09-04 23:14:37,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:14:37,492 INFO L93 Difference]: Finished difference Result 840 states and 887 transitions. [2020-09-04 23:14:37,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2020-09-04 23:14:37,494 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 371 [2020-09-04 23:14:37,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:14:37,496 INFO L225 Difference]: With dead ends: 840 [2020-09-04 23:14:37,496 INFO L226 Difference]: Without dead ends: 834 [2020-09-04 23:14:37,498 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3367 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=2706, Invalid=11814, Unknown=0, NotChecked=0, Total=14520 [2020-09-04 23:14:37,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 834 states. [2020-09-04 23:14:37,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 834 to 789. [2020-09-04 23:14:37,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 789 states. [2020-09-04 23:14:37,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 789 states to 789 states and 836 transitions. [2020-09-04 23:14:37,814 INFO L78 Accepts]: Start accepts. Automaton has 789 states and 836 transitions. Word has length 371 [2020-09-04 23:14:37,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:14:37,815 INFO L479 AbstractCegarLoop]: Abstraction has 789 states and 836 transitions. [2020-09-04 23:14:37,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-09-04 23:14:37,815 INFO L276 IsEmpty]: Start isEmpty. Operand 789 states and 836 transitions. [2020-09-04 23:14:37,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 372 [2020-09-04 23:14:37,818 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:14:37,818 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] [2020-09-04 23:14:37,818 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2020-09-04 23:14:37,818 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:14:37,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:14:37,819 INFO L82 PathProgramCache]: Analyzing trace with hash 117116641, now seen corresponding path program 31 times [2020-09-04 23:14:37,819 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:14:37,819 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1374752167] [2020-09-04 23:14:37,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:14:37,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:14:39,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:14:39,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:14:40,067 INFO L134 CoverageAnalysis]: Checked inductivity of 1446 backedges. 566 proven. 440 refuted. 0 times theorem prover too weak. 440 trivial. 0 not checked. [2020-09-04 23:14:40,067 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1374752167] [2020-09-04 23:14:40,067 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:14:40,067 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-09-04 23:14:40,067 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110081954] [2020-09-04 23:14:40,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-09-04 23:14:40,068 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:14:40,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-09-04 23:14:40,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=2067, Unknown=0, NotChecked=0, Total=2352 [2020-09-04 23:14:40,068 INFO L87 Difference]: Start difference. First operand 789 states and 836 transitions. Second operand 49 states. [2020-09-04 23:14:52,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:14:52,928 INFO L93 Difference]: Finished difference Result 1723 states and 1834 transitions. [2020-09-04 23:14:52,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2020-09-04 23:14:52,930 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 371 [2020-09-04 23:14:52,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:14:52,933 INFO L225 Difference]: With dead ends: 1723 [2020-09-04 23:14:52,934 INFO L226 Difference]: Without dead ends: 1498 [2020-09-04 23:14:52,935 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8169 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=3794, Invalid=23266, Unknown=0, NotChecked=0, Total=27060 [2020-09-04 23:14:52,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1498 states. [2020-09-04 23:14:53,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1498 to 873. [2020-09-04 23:14:53,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 873 states. [2020-09-04 23:14:53,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 873 states to 873 states and 926 transitions. [2020-09-04 23:14:53,377 INFO L78 Accepts]: Start accepts. Automaton has 873 states and 926 transitions. Word has length 371 [2020-09-04 23:14:53,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:14:53,377 INFO L479 AbstractCegarLoop]: Abstraction has 873 states and 926 transitions. [2020-09-04 23:14:53,377 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-09-04 23:14:53,378 INFO L276 IsEmpty]: Start isEmpty. Operand 873 states and 926 transitions. [2020-09-04 23:14:53,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 384 [2020-09-04 23:14:53,379 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:14:53,380 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] [2020-09-04 23:14:53,380 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2020-09-04 23:14:53,380 INFO L427 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:14:53,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:14:53,380 INFO L82 PathProgramCache]: Analyzing trace with hash -196331055, now seen corresponding path program 32 times [2020-09-04 23:14:53,380 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:14:53,381 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1867054998] [2020-09-04 23:14:53,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:14:53,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:14:55,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:14:55,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:14:55,686 INFO L134 CoverageAnalysis]: Checked inductivity of 1570 backedges. 675 proven. 393 refuted. 0 times theorem prover too weak. 502 trivial. 0 not checked. [2020-09-04 23:14:55,686 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1867054998] [2020-09-04 23:14:55,687 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:14:55,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-09-04 23:14:55,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932541797] [2020-09-04 23:14:55,687 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-09-04 23:14:55,687 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:14:55,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-09-04 23:14:55,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=2033, Unknown=0, NotChecked=0, Total=2352 [2020-09-04 23:14:55,688 INFO L87 Difference]: Start difference. First operand 873 states and 926 transitions. Second operand 49 states. [2020-09-04 23:15:10,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:15:10,688 INFO L93 Difference]: Finished difference Result 2385 states and 2545 transitions. [2020-09-04 23:15:10,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 152 states. [2020-09-04 23:15:10,690 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 383 [2020-09-04 23:15:10,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:15:10,696 INFO L225 Difference]: With dead ends: 2385 [2020-09-04 23:15:10,696 INFO L226 Difference]: Without dead ends: 2139 [2020-09-04 23:15:10,699 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10605 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=5008, Invalid=28664, Unknown=0, NotChecked=0, Total=33672 [2020-09-04 23:15:10,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2139 states. [2020-09-04 23:15:11,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2139 to 1085. [2020-09-04 23:15:11,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1085 states. [2020-09-04 23:15:11,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1085 states to 1085 states and 1153 transitions. [2020-09-04 23:15:11,390 INFO L78 Accepts]: Start accepts. Automaton has 1085 states and 1153 transitions. Word has length 383 [2020-09-04 23:15:11,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:15:11,390 INFO L479 AbstractCegarLoop]: Abstraction has 1085 states and 1153 transitions. [2020-09-04 23:15:11,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-09-04 23:15:11,390 INFO L276 IsEmpty]: Start isEmpty. Operand 1085 states and 1153 transitions. [2020-09-04 23:15:11,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 384 [2020-09-04 23:15:11,393 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:15:11,393 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] [2020-09-04 23:15:11,393 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2020-09-04 23:15:11,393 INFO L427 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:15:11,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:15:11,393 INFO L82 PathProgramCache]: Analyzing trace with hash -40152983, now seen corresponding path program 33 times [2020-09-04 23:15:11,394 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:15:11,394 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1125506004] [2020-09-04 23:15:11,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:15:11,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:15:13,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:15:13,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:15:14,039 INFO L134 CoverageAnalysis]: Checked inductivity of 1583 backedges. 578 proven. 560 refuted. 0 times theorem prover too weak. 445 trivial. 0 not checked. [2020-09-04 23:15:14,040 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1125506004] [2020-09-04 23:15:14,040 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:15:14,040 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2020-09-04 23:15:14,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801510904] [2020-09-04 23:15:14,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-09-04 23:15:14,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:15:14,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-09-04 23:15:14,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=295, Invalid=2357, Unknown=0, NotChecked=0, Total=2652 [2020-09-04 23:15:14,042 INFO L87 Difference]: Start difference. First operand 1085 states and 1153 transitions. Second operand 52 states. [2020-09-04 23:15:31,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:15:31,452 INFO L93 Difference]: Finished difference Result 2330 states and 2485 transitions. [2020-09-04 23:15:31,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2020-09-04 23:15:31,455 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 383 [2020-09-04 23:15:31,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:15:31,457 INFO L225 Difference]: With dead ends: 2330 [2020-09-04 23:15:31,457 INFO L226 Difference]: Without dead ends: 644 [2020-09-04 23:15:31,462 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10826 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=4844, Invalid=29938, Unknown=0, NotChecked=0, Total=34782 [2020-09-04 23:15:31,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 644 states. [2020-09-04 23:15:31,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 644 to 644. [2020-09-04 23:15:31,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 644 states. [2020-09-04 23:15:31,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 644 states to 644 states and 678 transitions. [2020-09-04 23:15:31,809 INFO L78 Accepts]: Start accepts. Automaton has 644 states and 678 transitions. Word has length 383 [2020-09-04 23:15:31,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:15:31,810 INFO L479 AbstractCegarLoop]: Abstraction has 644 states and 678 transitions. [2020-09-04 23:15:31,810 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-09-04 23:15:31,810 INFO L276 IsEmpty]: Start isEmpty. Operand 644 states and 678 transitions. [2020-09-04 23:15:31,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2020-09-04 23:15:31,812 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:15:31,812 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] [2020-09-04 23:15:31,812 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2020-09-04 23:15:31,812 INFO L427 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:15:31,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:15:31,813 INFO L82 PathProgramCache]: Analyzing trace with hash -1265151079, now seen corresponding path program 34 times [2020-09-04 23:15:31,813 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:15:31,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [994187939] [2020-09-04 23:15:31,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:15:31,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:15:34,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:15:34,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:15:34,632 INFO L134 CoverageAnalysis]: Checked inductivity of 1638 backedges. 363 proven. 409 refuted. 0 times theorem prover too weak. 866 trivial. 0 not checked. [2020-09-04 23:15:34,632 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [994187939] [2020-09-04 23:15:34,633 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:15:34,633 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-09-04 23:15:34,633 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632436533] [2020-09-04 23:15:34,633 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-09-04 23:15:34,634 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:15:34,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-09-04 23:15:34,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=365, Invalid=2185, Unknown=0, NotChecked=0, Total=2550 [2020-09-04 23:15:34,634 INFO L87 Difference]: Start difference. First operand 644 states and 678 transitions. Second operand 51 states. [2020-09-04 23:15:42,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:15:42,986 INFO L93 Difference]: Finished difference Result 1049 states and 1115 transitions. [2020-09-04 23:15:42,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2020-09-04 23:15:42,988 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 389 [2020-09-04 23:15:42,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:15:42,991 INFO L225 Difference]: With dead ends: 1049 [2020-09-04 23:15:42,991 INFO L226 Difference]: Without dead ends: 850 [2020-09-04 23:15:42,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5704 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=3698, Invalid=15484, Unknown=0, NotChecked=0, Total=19182 [2020-09-04 23:15:42,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 850 states. [2020-09-04 23:15:43,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 850 to 650. [2020-09-04 23:15:43,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 650 states. [2020-09-04 23:15:43,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 650 states to 650 states and 684 transitions. [2020-09-04 23:15:43,301 INFO L78 Accepts]: Start accepts. Automaton has 650 states and 684 transitions. Word has length 389 [2020-09-04 23:15:43,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:15:43,302 INFO L479 AbstractCegarLoop]: Abstraction has 650 states and 684 transitions. [2020-09-04 23:15:43,302 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-09-04 23:15:43,302 INFO L276 IsEmpty]: Start isEmpty. Operand 650 states and 684 transitions. [2020-09-04 23:15:43,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 396 [2020-09-04 23:15:43,304 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:15:43,305 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] [2020-09-04 23:15:43,305 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63 [2020-09-04 23:15:43,305 INFO L427 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:15:43,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:15:43,305 INFO L82 PathProgramCache]: Analyzing trace with hash -394029887, now seen corresponding path program 35 times [2020-09-04 23:15:43,305 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:15:43,306 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1936818223] [2020-09-04 23:15:43,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:15:43,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:15:46,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:15:46,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:15:46,559 INFO L134 CoverageAnalysis]: Checked inductivity of 1706 backedges. 367 proven. 769 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2020-09-04 23:15:46,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1936818223] [2020-09-04 23:15:46,560 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:15:46,560 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-09-04 23:15:46,560 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736337618] [2020-09-04 23:15:46,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-09-04 23:15:46,561 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:15:46,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-09-04 23:15:46,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=2619, Unknown=0, NotChecked=0, Total=2970 [2020-09-04 23:15:46,561 INFO L87 Difference]: Start difference. First operand 650 states and 684 transitions. Second operand 55 states. [2020-09-04 23:15:56,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:15:56,982 INFO L93 Difference]: Finished difference Result 906 states and 957 transitions. [2020-09-04 23:15:56,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2020-09-04 23:15:56,984 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 395 [2020-09-04 23:15:56,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:15:56,986 INFO L225 Difference]: With dead ends: 906 [2020-09-04 23:15:56,987 INFO L226 Difference]: Without dead ends: 900 [2020-09-04 23:15:56,988 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3980 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=3189, Invalid=13841, Unknown=0, NotChecked=0, Total=17030 [2020-09-04 23:15:56,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 900 states. [2020-09-04 23:15:57,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 900 to 851. [2020-09-04 23:15:57,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 851 states. [2020-09-04 23:15:57,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 851 states to 851 states and 902 transitions. [2020-09-04 23:15:57,444 INFO L78 Accepts]: Start accepts. Automaton has 851 states and 902 transitions. Word has length 395 [2020-09-04 23:15:57,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:15:57,445 INFO L479 AbstractCegarLoop]: Abstraction has 851 states and 902 transitions. [2020-09-04 23:15:57,445 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-09-04 23:15:57,445 INFO L276 IsEmpty]: Start isEmpty. Operand 851 states and 902 transitions. [2020-09-04 23:15:57,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 396 [2020-09-04 23:15:57,448 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:15:57,448 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] [2020-09-04 23:15:57,449 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2020-09-04 23:15:57,449 INFO L427 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:15:57,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:15:57,449 INFO L82 PathProgramCache]: Analyzing trace with hash 2054919001, now seen corresponding path program 36 times [2020-09-04 23:15:57,449 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:15:57,449 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2049102285] [2020-09-04 23:15:57,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:15:57,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:16:00,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:16:00,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:16:00,640 INFO L134 CoverageAnalysis]: Checked inductivity of 1707 backedges. 687 proven. 518 refuted. 0 times theorem prover too weak. 502 trivial. 0 not checked. [2020-09-04 23:16:00,640 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2049102285] [2020-09-04 23:16:00,641 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:16:00,641 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-09-04 23:16:00,641 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190944507] [2020-09-04 23:16:00,641 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-09-04 23:16:00,642 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:16:00,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-09-04 23:16:00,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=333, Invalid=2423, Unknown=0, NotChecked=0, Total=2756 [2020-09-04 23:16:00,642 INFO L87 Difference]: Start difference. First operand 851 states and 902 transitions. Second operand 53 states. [2020-09-04 23:16:19,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:16:19,350 INFO L93 Difference]: Finished difference Result 1944 states and 2071 transitions. [2020-09-04 23:16:19,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 145 states. [2020-09-04 23:16:19,352 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 395 [2020-09-04 23:16:19,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:16:19,358 INFO L225 Difference]: With dead ends: 1944 [2020-09-04 23:16:19,358 INFO L226 Difference]: Without dead ends: 1698 [2020-09-04 23:16:19,360 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9929 ImplicationChecksByTransitivity, 15.0s TimeCoverageRelationStatistics Valid=4545, Invalid=28035, Unknown=0, NotChecked=0, Total=32580 [2020-09-04 23:16:19,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1698 states. [2020-09-04 23:16:19,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1698 to 947. [2020-09-04 23:16:19,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 947 states. [2020-09-04 23:16:19,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 947 states to 947 states and 1005 transitions. [2020-09-04 23:16:19,998 INFO L78 Accepts]: Start accepts. Automaton has 947 states and 1005 transitions. Word has length 395 [2020-09-04 23:16:19,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:16:19,998 INFO L479 AbstractCegarLoop]: Abstraction has 947 states and 1005 transitions. [2020-09-04 23:16:19,998 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-09-04 23:16:19,998 INFO L276 IsEmpty]: Start isEmpty. Operand 947 states and 1005 transitions. [2020-09-04 23:16:20,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2020-09-04 23:16:20,001 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:16:20,001 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] [2020-09-04 23:16:20,001 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2020-09-04 23:16:20,001 INFO L427 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:16:20,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:16:20,001 INFO L82 PathProgramCache]: Analyzing trace with hash -421104055, now seen corresponding path program 37 times [2020-09-04 23:16:20,002 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:16:20,002 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1595534201] [2020-09-04 23:16:20,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:16:20,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:16:23,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:16:23,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:16:23,208 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 808 proven. 465 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2020-09-04 23:16:23,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1595534201] [2020-09-04 23:16:23,209 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:16:23,209 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-09-04 23:16:23,209 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772628953] [2020-09-04 23:16:23,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-09-04 23:16:23,210 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:16:23,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-09-04 23:16:23,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=371, Invalid=2385, Unknown=0, NotChecked=0, Total=2756 [2020-09-04 23:16:23,210 INFO L87 Difference]: Start difference. First operand 947 states and 1005 transitions. Second operand 53 states. [2020-09-04 23:16:44,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:16:44,506 INFO L93 Difference]: Finished difference Result 2667 states and 2848 transitions. [2020-09-04 23:16:44,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 167 states. [2020-09-04 23:16:44,510 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 407 [2020-09-04 23:16:44,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:16:44,516 INFO L225 Difference]: With dead ends: 2667 [2020-09-04 23:16:44,516 INFO L226 Difference]: Without dead ends: 2400 [2020-09-04 23:16:44,520 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12865 ImplicationChecksByTransitivity, 17.1s TimeCoverageRelationStatistics Valid=6028, Invalid=34574, Unknown=0, NotChecked=0, Total=40602 [2020-09-04 23:16:44,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2400 states. [2020-09-04 23:16:45,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2400 to 1185. [2020-09-04 23:16:45,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1185 states. [2020-09-04 23:16:45,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1185 states to 1185 states and 1260 transitions. [2020-09-04 23:16:45,268 INFO L78 Accepts]: Start accepts. Automaton has 1185 states and 1260 transitions. Word has length 407 [2020-09-04 23:16:45,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:16:45,269 INFO L479 AbstractCegarLoop]: Abstraction has 1185 states and 1260 transitions. [2020-09-04 23:16:45,269 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-09-04 23:16:45,269 INFO L276 IsEmpty]: Start isEmpty. Operand 1185 states and 1260 transitions. [2020-09-04 23:16:45,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2020-09-04 23:16:45,272 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:16:45,272 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] [2020-09-04 23:16:45,272 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66 [2020-09-04 23:16:45,272 INFO L427 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:16:45,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:16:45,272 INFO L82 PathProgramCache]: Analyzing trace with hash 1963516129, now seen corresponding path program 38 times [2020-09-04 23:16:45,273 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:16:45,273 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1942495857] [2020-09-04 23:16:45,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:16:45,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:16:48,944 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:16:48,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:16:49,084 INFO L134 CoverageAnalysis]: Checked inductivity of 1856 backedges. 699 proven. 650 refuted. 0 times theorem prover too weak. 507 trivial. 0 not checked. [2020-09-04 23:16:49,085 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1942495857] [2020-09-04 23:16:49,085 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:16:49,085 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2020-09-04 23:16:49,085 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578935852] [2020-09-04 23:16:49,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-09-04 23:16:49,086 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:16:49,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-09-04 23:16:49,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=343, Invalid=2737, Unknown=0, NotChecked=0, Total=3080 [2020-09-04 23:16:49,087 INFO L87 Difference]: Start difference. First operand 1185 states and 1260 transitions. Second operand 56 states. [2020-09-04 23:17:14,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:17:14,978 INFO L93 Difference]: Finished difference Result 2636 states and 2814 transitions. [2020-09-04 23:17:14,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 166 states. [2020-09-04 23:17:14,982 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 407 [2020-09-04 23:17:14,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:17:14,984 INFO L225 Difference]: With dead ends: 2636 [2020-09-04 23:17:14,984 INFO L226 Difference]: Without dead ends: 694 [2020-09-04 23:17:14,988 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13147 ImplicationChecksByTransitivity, 20.4s TimeCoverageRelationStatistics Valid=5775, Invalid=36045, Unknown=0, NotChecked=0, Total=41820 [2020-09-04 23:17:14,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 694 states. [2020-09-04 23:17:15,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 694 to 694. [2020-09-04 23:17:15,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 694 states. [2020-09-04 23:17:15,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 694 states to 694 states and 731 transitions. [2020-09-04 23:17:15,290 INFO L78 Accepts]: Start accepts. Automaton has 694 states and 731 transitions. Word has length 407 [2020-09-04 23:17:15,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:17:15,290 INFO L479 AbstractCegarLoop]: Abstraction has 694 states and 731 transitions. [2020-09-04 23:17:15,290 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-09-04 23:17:15,290 INFO L276 IsEmpty]: Start isEmpty. Operand 694 states and 731 transitions. [2020-09-04 23:17:15,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 414 [2020-09-04 23:17:15,293 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:17:15,293 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] [2020-09-04 23:17:15,293 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67 [2020-09-04 23:17:15,293 INFO L427 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:17:15,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:17:15,293 INFO L82 PathProgramCache]: Analyzing trace with hash 863156241, now seen corresponding path program 39 times [2020-09-04 23:17:15,294 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:17:15,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1954156952] [2020-09-04 23:17:15,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:17:15,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:17:19,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:17:19,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:17:19,309 INFO L134 CoverageAnalysis]: Checked inductivity of 1917 backedges. 432 proven. 482 refuted. 0 times theorem prover too weak. 1003 trivial. 0 not checked. [2020-09-04 23:17:19,309 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1954156952] [2020-09-04 23:17:19,310 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:17:19,310 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-09-04 23:17:19,310 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [942852829] [2020-09-04 23:17:19,311 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-09-04 23:17:19,311 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:17:19,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-09-04 23:17:19,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=421, Invalid=2549, Unknown=0, NotChecked=0, Total=2970 [2020-09-04 23:17:19,312 INFO L87 Difference]: Start difference. First operand 694 states and 731 transitions. Second operand 55 states. [2020-09-04 23:17:31,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:17:31,339 INFO L93 Difference]: Finished difference Result 1123 states and 1194 transitions. [2020-09-04 23:17:31,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2020-09-04 23:17:31,342 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 413 [2020-09-04 23:17:31,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:17:31,344 INFO L225 Difference]: With dead ends: 1123 [2020-09-04 23:17:31,345 INFO L226 Difference]: Without dead ends: 912 [2020-09-04 23:17:31,346 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6804 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=4363, Invalid=18287, Unknown=0, NotChecked=0, Total=22650 [2020-09-04 23:17:31,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 912 states. [2020-09-04 23:17:31,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 912 to 700. [2020-09-04 23:17:31,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 700 states. [2020-09-04 23:17:31,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 700 states to 700 states and 737 transitions. [2020-09-04 23:17:31,653 INFO L78 Accepts]: Start accepts. Automaton has 700 states and 737 transitions. Word has length 413 [2020-09-04 23:17:31,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:17:31,653 INFO L479 AbstractCegarLoop]: Abstraction has 700 states and 737 transitions. [2020-09-04 23:17:31,653 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-09-04 23:17:31,653 INFO L276 IsEmpty]: Start isEmpty. Operand 700 states and 737 transitions. [2020-09-04 23:17:31,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 420 [2020-09-04 23:17:31,656 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:17:31,656 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] [2020-09-04 23:17:31,656 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2020-09-04 23:17:31,656 INFO L427 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:17:31,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:17:31,657 INFO L82 PathProgramCache]: Analyzing trace with hash 1505331513, now seen corresponding path program 40 times [2020-09-04 23:17:31,657 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:17:31,657 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1968010159] [2020-09-04 23:17:31,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:17:31,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:17:36,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:17:36,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:17:36,373 INFO L134 CoverageAnalysis]: Checked inductivity of 1991 backedges. 436 proven. 911 refuted. 0 times theorem prover too weak. 644 trivial. 0 not checked. [2020-09-04 23:17:36,373 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1968010159] [2020-09-04 23:17:36,373 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:17:36,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2020-09-04 23:17:36,374 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324680280] [2020-09-04 23:17:36,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-09-04 23:17:36,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:17:36,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-09-04 23:17:36,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=427, Invalid=2879, Unknown=0, NotChecked=0, Total=3306 [2020-09-04 23:17:36,376 INFO L87 Difference]: Start difference. First operand 700 states and 737 transitions. Second operand 58 states. [2020-09-04 23:17:56,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:17:56,561 INFO L93 Difference]: Finished difference Result 2265 states and 2409 transitions. [2020-09-04 23:17:56,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2020-09-04 23:17:56,566 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 419 [2020-09-04 23:17:56,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:17:56,569 INFO L225 Difference]: With dead ends: 2265 [2020-09-04 23:17:56,570 INFO L226 Difference]: Without dead ends: 2259 [2020-09-04 23:17:56,571 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8068 ImplicationChecksByTransitivity, 17.3s TimeCoverageRelationStatistics Valid=5776, Invalid=23294, Unknown=0, NotChecked=0, Total=29070 [2020-09-04 23:17:56,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2259 states. [2020-09-04 23:17:57,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2259 to 1075. [2020-09-04 23:17:57,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1075 states. [2020-09-04 23:17:57,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1075 states to 1075 states and 1146 transitions. [2020-09-04 23:17:57,162 INFO L78 Accepts]: Start accepts. Automaton has 1075 states and 1146 transitions. Word has length 419 [2020-09-04 23:17:57,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:17:57,162 INFO L479 AbstractCegarLoop]: Abstraction has 1075 states and 1146 transitions. [2020-09-04 23:17:57,162 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-09-04 23:17:57,162 INFO L276 IsEmpty]: Start isEmpty. Operand 1075 states and 1146 transitions. [2020-09-04 23:17:57,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 420 [2020-09-04 23:17:57,165 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:17:57,165 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] [2020-09-04 23:17:57,166 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69 [2020-09-04 23:17:57,166 INFO L427 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:17:57,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:17:57,166 INFO L82 PathProgramCache]: Analyzing trace with hash 1143921617, now seen corresponding path program 41 times [2020-09-04 23:17:57,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:17:57,167 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [735595471] [2020-09-04 23:17:57,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:17:57,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:18:01,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:18:01,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:18:01,699 INFO L134 CoverageAnalysis]: Checked inductivity of 1992 backedges. 820 proven. 602 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2020-09-04 23:18:01,700 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [735595471] [2020-09-04 23:18:01,700 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:18:01,700 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-09-04 23:18:01,700 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218529416] [2020-09-04 23:18:01,700 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-09-04 23:18:01,701 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:18:01,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-09-04 23:18:01,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=385, Invalid=2807, Unknown=0, NotChecked=0, Total=3192 [2020-09-04 23:18:01,701 INFO L87 Difference]: Start difference. First operand 1075 states and 1146 transitions. Second operand 57 states. [2020-09-04 23:18:29,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:18:29,835 INFO L93 Difference]: Finished difference Result 3817 states and 4086 transitions. [2020-09-04 23:18:29,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 158 states. [2020-09-04 23:18:29,839 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 419 [2020-09-04 23:18:29,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:18:29,844 INFO L225 Difference]: With dead ends: 3817 [2020-09-04 23:18:29,844 INFO L226 Difference]: Without dead ends: 3277 [2020-09-04 23:18:29,847 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11861 ImplicationChecksByTransitivity, 21.7s TimeCoverageRelationStatistics Valid=5364, Invalid=33248, Unknown=0, NotChecked=0, Total=38612 [2020-09-04 23:18:29,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3277 states. [2020-09-04 23:18:30,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3277 to 1291. [2020-09-04 23:18:30,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1291 states. [2020-09-04 23:18:30,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1291 states to 1291 states and 1378 transitions. [2020-09-04 23:18:30,842 INFO L78 Accepts]: Start accepts. Automaton has 1291 states and 1378 transitions. Word has length 419 [2020-09-04 23:18:30,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:18:30,842 INFO L479 AbstractCegarLoop]: Abstraction has 1291 states and 1378 transitions. [2020-09-04 23:18:30,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-09-04 23:18:30,842 INFO L276 IsEmpty]: Start isEmpty. Operand 1291 states and 1378 transitions. [2020-09-04 23:18:30,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 432 [2020-09-04 23:18:30,845 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:18:30,846 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] [2020-09-04 23:18:30,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70 [2020-09-04 23:18:30,846 INFO L427 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:18:30,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:18:30,846 INFO L82 PathProgramCache]: Analyzing trace with hash -533104959, now seen corresponding path program 42 times [2020-09-04 23:18:30,847 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:18:30,847 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1179857334] [2020-09-04 23:18:30,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:18:30,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:18:35,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:18:35,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:18:35,659 INFO L134 CoverageAnalysis]: Checked inductivity of 2140 backedges. 953 proven. 543 refuted. 0 times theorem prover too weak. 644 trivial. 0 not checked. [2020-09-04 23:18:35,660 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1179857334] [2020-09-04 23:18:35,660 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:18:35,660 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-09-04 23:18:35,660 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995157256] [2020-09-04 23:18:35,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-09-04 23:18:35,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:18:35,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-09-04 23:18:35,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=427, Invalid=2765, Unknown=0, NotChecked=0, Total=3192 [2020-09-04 23:18:35,661 INFO L87 Difference]: Start difference. First operand 1291 states and 1378 transitions. Second operand 57 states. [2020-09-04 23:19:04,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:19:04,843 INFO L93 Difference]: Finished difference Result 3867 states and 4141 transitions. [2020-09-04 23:19:04,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 182 states. [2020-09-04 23:19:04,849 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 431 [2020-09-04 23:19:04,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:19:04,853 INFO L225 Difference]: With dead ends: 3867 [2020-09-04 23:19:04,853 INFO L226 Difference]: Without dead ends: 3579 [2020-09-04 23:19:04,856 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 218 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15341 ImplicationChecksByTransitivity, 25.4s TimeCoverageRelationStatistics Valid=7143, Invalid=41037, Unknown=0, NotChecked=0, Total=48180 [2020-09-04 23:19:04,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3579 states. [2020-09-04 23:19:06,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3579 to 1499. [2020-09-04 23:19:06,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1499 states. [2020-09-04 23:19:06,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1499 states to 1499 states and 1601 transitions. [2020-09-04 23:19:06,065 INFO L78 Accepts]: Start accepts. Automaton has 1499 states and 1601 transitions. Word has length 431 [2020-09-04 23:19:06,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:19:06,065 INFO L479 AbstractCegarLoop]: Abstraction has 1499 states and 1601 transitions. [2020-09-04 23:19:06,065 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-09-04 23:19:06,066 INFO L276 IsEmpty]: Start isEmpty. Operand 1499 states and 1601 transitions. [2020-09-04 23:19:06,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 432 [2020-09-04 23:19:06,069 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:19:06,069 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] [2020-09-04 23:19:06,069 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2020-09-04 23:19:06,070 INFO L427 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:19:06,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:19:06,070 INFO L82 PathProgramCache]: Analyzing trace with hash 1554199897, now seen corresponding path program 43 times [2020-09-04 23:19:06,070 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:19:06,070 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [545394313] [2020-09-04 23:19:06,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:19:06,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:19:11,449 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:19:11,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:19:11,586 INFO L134 CoverageAnalysis]: Checked inductivity of 2153 backedges. 832 proven. 746 refuted. 0 times theorem prover too weak. 575 trivial. 0 not checked. [2020-09-04 23:19:11,587 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [545394313] [2020-09-04 23:19:11,587 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:19:11,587 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2020-09-04 23:19:11,587 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083565507] [2020-09-04 23:19:11,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-09-04 23:19:11,588 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:19:11,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-09-04 23:19:11,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=395, Invalid=3145, Unknown=0, NotChecked=0, Total=3540 [2020-09-04 23:19:11,589 INFO L87 Difference]: Start difference. First operand 1499 states and 1601 transitions. Second operand 60 states. [2020-09-04 23:19:49,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:19:49,901 INFO L93 Difference]: Finished difference Result 5100 states and 5465 transitions. [2020-09-04 23:19:49,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 181 states. [2020-09-04 23:19:49,906 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 431 [2020-09-04 23:19:49,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:19:49,907 INFO L225 Difference]: With dead ends: 5100 [2020-09-04 23:19:49,907 INFO L226 Difference]: Without dead ends: 744 [2020-09-04 23:19:49,915 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 221 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15694 ImplicationChecksByTransitivity, 30.0s TimeCoverageRelationStatistics Valid=6787, Invalid=42719, Unknown=0, NotChecked=0, Total=49506 [2020-09-04 23:19:49,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 744 states. [2020-09-04 23:19:50,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 744 to 744. [2020-09-04 23:19:50,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 744 states. [2020-09-04 23:19:50,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 744 states to 744 states and 784 transitions. [2020-09-04 23:19:50,414 INFO L78 Accepts]: Start accepts. Automaton has 744 states and 784 transitions. Word has length 431 [2020-09-04 23:19:50,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:19:50,414 INFO L479 AbstractCegarLoop]: Abstraction has 744 states and 784 transitions. [2020-09-04 23:19:50,415 INFO L480 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-09-04 23:19:50,415 INFO L276 IsEmpty]: Start isEmpty. Operand 744 states and 784 transitions. [2020-09-04 23:19:50,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 438 [2020-09-04 23:19:50,417 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:19:50,418 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] [2020-09-04 23:19:50,418 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72 [2020-09-04 23:19:50,418 INFO L427 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:19:50,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:19:50,418 INFO L82 PathProgramCache]: Analyzing trace with hash -770776951, now seen corresponding path program 44 times [2020-09-04 23:19:50,419 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:19:50,419 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1030062222] [2020-09-04 23:19:50,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:19:50,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:19:56,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:19:56,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:19:56,315 INFO L134 CoverageAnalysis]: Checked inductivity of 2220 backedges. 507 proven. 561 refuted. 0 times theorem prover too weak. 1152 trivial. 0 not checked. [2020-09-04 23:19:56,315 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1030062222] [2020-09-04 23:19:56,316 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:19:56,316 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-09-04 23:19:56,316 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278818565] [2020-09-04 23:19:56,316 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-09-04 23:19:56,317 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:19:56,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-09-04 23:19:56,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=2941, Unknown=0, NotChecked=0, Total=3422 [2020-09-04 23:19:56,317 INFO L87 Difference]: Start difference. First operand 744 states and 784 transitions. Second operand 59 states. [2020-09-04 23:20:13,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:20:13,888 INFO L93 Difference]: Finished difference Result 1197 states and 1273 transitions. [2020-09-04 23:20:13,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2020-09-04 23:20:13,893 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 437 [2020-09-04 23:20:13,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:20:13,895 INFO L225 Difference]: With dead ends: 1197 [2020-09-04 23:20:13,895 INFO L226 Difference]: Without dead ends: 974 [2020-09-04 23:20:13,897 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8001 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=5083, Invalid=21323, Unknown=0, NotChecked=0, Total=26406 [2020-09-04 23:20:13,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 974 states. [2020-09-04 23:20:14,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 974 to 750. [2020-09-04 23:20:14,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 750 states. [2020-09-04 23:20:14,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 750 states to 750 states and 790 transitions. [2020-09-04 23:20:14,352 INFO L78 Accepts]: Start accepts. Automaton has 750 states and 790 transitions. Word has length 437 [2020-09-04 23:20:14,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:20:14,352 INFO L479 AbstractCegarLoop]: Abstraction has 750 states and 790 transitions. [2020-09-04 23:20:14,352 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-09-04 23:20:14,352 INFO L276 IsEmpty]: Start isEmpty. Operand 750 states and 790 transitions. [2020-09-04 23:20:14,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 444 [2020-09-04 23:20:14,355 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:20:14,356 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] [2020-09-04 23:20:14,356 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73 [2020-09-04 23:20:14,356 INFO L427 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:20:14,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:20:14,356 INFO L82 PathProgramCache]: Analyzing trace with hash -1112653391, now seen corresponding path program 45 times [2020-09-04 23:20:14,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:20:14,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1623196069] [2020-09-04 23:20:14,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:20:14,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:20:20,631 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:20:20,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:20:20,762 INFO L134 CoverageAnalysis]: Checked inductivity of 2300 backedges. 511 proven. 1065 refuted. 0 times theorem prover too weak. 724 trivial. 0 not checked. [2020-09-04 23:20:20,763 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1623196069] [2020-09-04 23:20:20,763 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:20:20,763 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62] total 62 [2020-09-04 23:20:20,763 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704491014] [2020-09-04 23:20:20,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-09-04 23:20:20,764 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:20:20,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-09-04 23:20:20,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=487, Invalid=3295, Unknown=0, NotChecked=0, Total=3782 [2020-09-04 23:20:20,765 INFO L87 Difference]: Start difference. First operand 750 states and 790 transitions. Second operand 62 states. [2020-09-04 23:20:48,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:20:48,088 INFO L93 Difference]: Finished difference Result 2595 states and 2763 transitions. [2020-09-04 23:20:48,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2020-09-04 23:20:48,094 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 443 [2020-09-04 23:20:48,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:20:48,099 INFO L225 Difference]: With dead ends: 2595 [2020-09-04 23:20:48,100 INFO L226 Difference]: Without dead ends: 2589 [2020-09-04 23:20:48,102 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9415 ImplicationChecksByTransitivity, 24.6s TimeCoverageRelationStatistics Valid=6715, Invalid=26957, Unknown=0, NotChecked=0, Total=33672 [2020-09-04 23:20:48,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2589 states. [2020-09-04 23:20:48,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2589 to 1157. [2020-09-04 23:20:48,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1157 states. [2020-09-04 23:20:48,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1157 states to 1157 states and 1234 transitions. [2020-09-04 23:20:48,959 INFO L78 Accepts]: Start accepts. Automaton has 1157 states and 1234 transitions. Word has length 443 [2020-09-04 23:20:48,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:20:48,960 INFO L479 AbstractCegarLoop]: Abstraction has 1157 states and 1234 transitions. [2020-09-04 23:20:48,960 INFO L480 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-09-04 23:20:48,960 INFO L276 IsEmpty]: Start isEmpty. Operand 1157 states and 1234 transitions. [2020-09-04 23:20:48,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 444 [2020-09-04 23:20:48,963 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:20:48,963 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] [2020-09-04 23:20:48,964 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2020-09-04 23:20:48,964 INFO L427 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:20:48,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:20:48,964 INFO L82 PathProgramCache]: Analyzing trace with hash -1785403319, now seen corresponding path program 46 times [2020-09-04 23:20:48,964 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:20:48,965 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2088397888] [2020-09-04 23:20:48,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:20:49,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:20:55,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:20:55,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:20:55,687 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 965 proven. 692 refuted. 0 times theorem prover too weak. 644 trivial. 0 not checked. [2020-09-04 23:20:55,688 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2088397888] [2020-09-04 23:20:55,688 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:20:55,688 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-09-04 23:20:55,688 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044604897] [2020-09-04 23:20:55,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-09-04 23:20:55,689 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:20:55,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-09-04 23:20:55,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=3219, Unknown=0, NotChecked=0, Total=3660 [2020-09-04 23:20:55,690 INFO L87 Difference]: Start difference. First operand 1157 states and 1234 transitions. Second operand 61 states. [2020-09-04 23:21:37,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:21:37,250 INFO L93 Difference]: Finished difference Result 4277 states and 4581 transitions. [2020-09-04 23:21:37,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 171 states. [2020-09-04 23:21:37,255 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 443 [2020-09-04 23:21:37,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:21:37,261 INFO L225 Difference]: With dead ends: 4277 [2020-09-04 23:21:37,261 INFO L226 Difference]: Without dead ends: 3695 [2020-09-04 23:21:37,265 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 211 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13965 ImplicationChecksByTransitivity, 32.1s TimeCoverageRelationStatistics Valid=6251, Invalid=38905, Unknown=0, NotChecked=0, Total=45156 [2020-09-04 23:21:37,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3695 states. [2020-09-04 23:21:38,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3695 to 1397. [2020-09-04 23:21:38,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1397 states. [2020-09-04 23:21:38,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1397 states to 1397 states and 1492 transitions. [2020-09-04 23:21:38,642 INFO L78 Accepts]: Start accepts. Automaton has 1397 states and 1492 transitions. Word has length 443 [2020-09-04 23:21:38,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:21:38,643 INFO L479 AbstractCegarLoop]: Abstraction has 1397 states and 1492 transitions. [2020-09-04 23:21:38,643 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-09-04 23:21:38,643 INFO L276 IsEmpty]: Start isEmpty. Operand 1397 states and 1492 transitions. [2020-09-04 23:21:38,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 456 [2020-09-04 23:21:38,647 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:21:38,647 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] [2020-09-04 23:21:38,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75 [2020-09-04 23:21:38,647 INFO L427 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:21:38,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:21:38,647 INFO L82 PathProgramCache]: Analyzing trace with hash -263898311, now seen corresponding path program 47 times [2020-09-04 23:21:38,648 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:21:38,648 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1486040926] [2020-09-04 23:21:38,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:21:38,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:21:45,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:21:45,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:21:45,418 INFO L134 CoverageAnalysis]: Checked inductivity of 2461 backedges. 1110 proven. 627 refuted. 0 times theorem prover too weak. 724 trivial. 0 not checked. [2020-09-04 23:21:45,418 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1486040926] [2020-09-04 23:21:45,418 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:21:45,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-09-04 23:21:45,419 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [71010522] [2020-09-04 23:21:45,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-09-04 23:21:45,419 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:21:45,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-09-04 23:21:45,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=487, Invalid=3173, Unknown=0, NotChecked=0, Total=3660 [2020-09-04 23:21:45,420 INFO L87 Difference]: Start difference. First operand 1397 states and 1492 transitions. Second operand 61 states. [2020-09-04 23:22:23,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:22:23,287 INFO L93 Difference]: Finished difference Result 4255 states and 4559 transitions. [2020-09-04 23:22:23,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 197 states. [2020-09-04 23:22:23,293 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 455 [2020-09-04 23:22:23,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:22:23,297 INFO L225 Difference]: With dead ends: 4255 [2020-09-04 23:22:23,297 INFO L226 Difference]: Without dead ends: 3946 [2020-09-04 23:22:23,301 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18033 ImplicationChecksByTransitivity, 31.6s TimeCoverageRelationStatistics Valid=8353, Invalid=48053, Unknown=0, NotChecked=0, Total=56406 [2020-09-04 23:22:23,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3946 states. [2020-09-04 23:22:24,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3946 to 1619. [2020-09-04 23:22:24,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1619 states. [2020-09-04 23:22:24,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1619 states to 1619 states and 1730 transitions. [2020-09-04 23:22:24,602 INFO L78 Accepts]: Start accepts. Automaton has 1619 states and 1730 transitions. Word has length 455 [2020-09-04 23:22:24,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:22:24,602 INFO L479 AbstractCegarLoop]: Abstraction has 1619 states and 1730 transitions. [2020-09-04 23:22:24,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-09-04 23:22:24,602 INFO L276 IsEmpty]: Start isEmpty. Operand 1619 states and 1730 transitions. [2020-09-04 23:22:24,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 456 [2020-09-04 23:22:24,606 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:22:24,606 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] [2020-09-04 23:22:24,606 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76 [2020-09-04 23:22:24,606 INFO L427 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:22:24,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:22:24,606 INFO L82 PathProgramCache]: Analyzing trace with hash -1511371311, now seen corresponding path program 48 times [2020-09-04 23:22:24,607 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:22:24,607 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1034936559] [2020-09-04 23:22:24,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:22:24,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:22:30,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:22:30,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:22:30,431 INFO L134 CoverageAnalysis]: Checked inductivity of 2474 backedges. 977 proven. 848 refuted. 0 times theorem prover too weak. 649 trivial. 0 not checked. [2020-09-04 23:22:30,432 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1034936559] [2020-09-04 23:22:30,432 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:22:30,432 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64] total 64 [2020-09-04 23:22:30,432 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434710115] [2020-09-04 23:22:30,432 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2020-09-04 23:22:30,433 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:22:30,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2020-09-04 23:22:30,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=451, Invalid=3581, Unknown=0, NotChecked=0, Total=4032 [2020-09-04 23:22:30,433 INFO L87 Difference]: Start difference. First operand 1619 states and 1730 transitions. Second operand 64 states. [2020-09-04 23:23:11,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:23:11,030 INFO L93 Difference]: Finished difference Result 5704 states and 6116 transitions. [2020-09-04 23:23:11,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 196 states. [2020-09-04 23:23:11,034 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 455 [2020-09-04 23:23:11,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:23:11,036 INFO L225 Difference]: With dead ends: 5704 [2020-09-04 23:23:11,036 INFO L226 Difference]: Without dead ends: 794 [2020-09-04 23:23:11,045 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 239 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18467 ImplicationChecksByTransitivity, 32.1s TimeCoverageRelationStatistics Valid=7880, Invalid=49960, Unknown=0, NotChecked=0, Total=57840 [2020-09-04 23:23:11,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 794 states. [2020-09-04 23:23:11,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 794 to 794. [2020-09-04 23:23:11,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 794 states. [2020-09-04 23:23:11,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 794 states to 794 states and 837 transitions. [2020-09-04 23:23:11,458 INFO L78 Accepts]: Start accepts. Automaton has 794 states and 837 transitions. Word has length 455 [2020-09-04 23:23:11,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:23:11,459 INFO L479 AbstractCegarLoop]: Abstraction has 794 states and 837 transitions. [2020-09-04 23:23:11,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 64 states. [2020-09-04 23:23:11,459 INFO L276 IsEmpty]: Start isEmpty. Operand 794 states and 837 transitions. [2020-09-04 23:23:11,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 462 [2020-09-04 23:23:11,461 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:23:11,461 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] [2020-09-04 23:23:11,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2020-09-04 23:23:11,461 INFO L427 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:23:11,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:23:11,462 INFO L82 PathProgramCache]: Analyzing trace with hash 141282561, now seen corresponding path program 49 times [2020-09-04 23:23:11,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:23:11,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [173420516] [2020-09-04 23:23:11,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:23:11,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:23:17,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:23:17,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:23:17,822 INFO L134 CoverageAnalysis]: Checked inductivity of 2547 backedges. 588 proven. 646 refuted. 0 times theorem prover too weak. 1313 trivial. 0 not checked. [2020-09-04 23:23:17,822 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [173420516] [2020-09-04 23:23:17,822 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:23:17,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63] total 63 [2020-09-04 23:23:17,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649436082] [2020-09-04 23:23:17,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2020-09-04 23:23:17,823 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:23:17,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2020-09-04 23:23:17,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=545, Invalid=3361, Unknown=0, NotChecked=0, Total=3906 [2020-09-04 23:23:17,824 INFO L87 Difference]: Start difference. First operand 794 states and 837 transitions. Second operand 63 states. [2020-09-04 23:23:35,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:23:35,533 INFO L93 Difference]: Finished difference Result 1271 states and 1352 transitions. [2020-09-04 23:23:35,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2020-09-04 23:23:35,538 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 461 [2020-09-04 23:23:35,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:23:35,540 INFO L225 Difference]: With dead ends: 1271 [2020-09-04 23:23:35,540 INFO L226 Difference]: Without dead ends: 1036 [2020-09-04 23:23:35,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9295 ImplicationChecksByTransitivity, 18.5s TimeCoverageRelationStatistics Valid=5858, Invalid=24592, Unknown=0, NotChecked=0, Total=30450 [2020-09-04 23:23:35,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1036 states. [2020-09-04 23:23:35,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1036 to 800. [2020-09-04 23:23:35,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 800 states. [2020-09-04 23:23:35,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 800 states to 800 states and 843 transitions. [2020-09-04 23:23:35,959 INFO L78 Accepts]: Start accepts. Automaton has 800 states and 843 transitions. Word has length 461 [2020-09-04 23:23:35,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:23:35,960 INFO L479 AbstractCegarLoop]: Abstraction has 800 states and 843 transitions. [2020-09-04 23:23:35,960 INFO L480 AbstractCegarLoop]: Interpolant automaton has 63 states. [2020-09-04 23:23:35,960 INFO L276 IsEmpty]: Start isEmpty. Operand 800 states and 843 transitions. [2020-09-04 23:23:35,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-09-04 23:23:35,962 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:23:35,962 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] [2020-09-04 23:23:35,963 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78 [2020-09-04 23:23:35,963 INFO L427 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:23:35,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:23:35,963 INFO L82 PathProgramCache]: Analyzing trace with hash 585219625, now seen corresponding path program 50 times [2020-09-04 23:23:35,963 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:23:35,963 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [227535957] [2020-09-04 23:23:35,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:23:36,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat