/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/loop-acceleration/array_3-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-267fbe0 [2020-07-17 18:07:04,503 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-17 18:07:04,505 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-17 18:07:04,518 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-17 18:07:04,518 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-17 18:07:04,519 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-17 18:07:04,521 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-17 18:07:04,523 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-17 18:07:04,524 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-17 18:07:04,525 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-17 18:07:04,526 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-17 18:07:04,527 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-17 18:07:04,528 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-17 18:07:04,529 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-17 18:07:04,530 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-17 18:07:04,531 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-17 18:07:04,532 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-17 18:07:04,533 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-17 18:07:04,535 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-17 18:07:04,536 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-17 18:07:04,538 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-17 18:07:04,539 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-17 18:07:04,540 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-17 18:07:04,541 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-17 18:07:04,543 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-17 18:07:04,544 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-17 18:07:04,544 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-17 18:07:04,545 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-17 18:07:04,545 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-17 18:07:04,546 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-17 18:07:04,547 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-17 18:07:04,547 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-17 18:07:04,548 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-17 18:07:04,549 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-17 18:07:04,550 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-17 18:07:04,550 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-17 18:07:04,551 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-17 18:07:04,551 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-17 18:07:04,551 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-17 18:07:04,552 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-17 18:07:04,553 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-17 18:07:04,554 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-07-17 18:07:04,563 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-17 18:07:04,563 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-17 18:07:04,564 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-17 18:07:04,565 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-17 18:07:04,565 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-17 18:07:04,565 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-17 18:07:04,565 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-17 18:07:04,565 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-17 18:07:04,566 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-17 18:07:04,566 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-17 18:07:04,566 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-17 18:07:04,566 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-17 18:07:04,566 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-17 18:07:04,566 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-17 18:07:04,567 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-17 18:07:04,567 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-07-17 18:07:04,567 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-17 18:07:04,567 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-17 18:07:04,567 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-17 18:07:04,568 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-17 18:07:04,568 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-07-17 18:07:04,568 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-17 18:07:04,568 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 [2020-07-17 18:07:04,867 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-17 18:07:04,881 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-17 18:07:04,887 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-17 18:07:04,889 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-17 18:07:04,890 INFO L275 PluginConnector]: CDTParser initialized [2020-07-17 18:07:04,891 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-07-17 18:07:04,969 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c9998fae7/c1f36fa2d9084ac1ae80058af2d11619/FLAG07414cbcf [2020-07-17 18:07:05,361 INFO L306 CDTParser]: Found 1 translation units. [2020-07-17 18:07:05,362 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-07-17 18:07:05,369 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c9998fae7/c1f36fa2d9084ac1ae80058af2d11619/FLAG07414cbcf [2020-07-17 18:07:05,733 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c9998fae7/c1f36fa2d9084ac1ae80058af2d11619 [2020-07-17 18:07:05,743 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-17 18:07:05,745 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-17 18:07:05,746 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-17 18:07:05,747 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-17 18:07:05,752 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-17 18:07:05,754 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.07 06:07:05" (1/1) ... [2020-07-17 18:07:05,757 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1eabeb9c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:07:05, skipping insertion in model container [2020-07-17 18:07:05,757 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.07 06:07:05" (1/1) ... [2020-07-17 18:07:05,765 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-17 18:07:05,786 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-17 18:07:06,002 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-17 18:07:06,009 INFO L203 MainTranslator]: Completed pre-run [2020-07-17 18:07:06,032 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-17 18:07:06,048 INFO L208 MainTranslator]: Completed translation [2020-07-17 18:07:06,049 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:07:06 WrapperNode [2020-07-17 18:07:06,049 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-17 18:07:06,050 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-17 18:07:06,050 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-17 18:07:06,050 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-17 18:07:06,060 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:07:06" (1/1) ... [2020-07-17 18:07:06,060 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:07:06" (1/1) ... [2020-07-17 18:07:06,153 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:07:06" (1/1) ... [2020-07-17 18:07:06,154 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:07:06" (1/1) ... [2020-07-17 18:07:06,160 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:07:06" (1/1) ... [2020-07-17 18:07:06,165 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:07:06" (1/1) ... [2020-07-17 18:07:06,166 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:07:06" (1/1) ... [2020-07-17 18:07:06,168 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-17 18:07:06,169 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-17 18:07:06,169 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-17 18:07:06,169 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-17 18:07:06,170 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:07:06" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-17 18:07:06,235 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-17 18:07:06,235 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-17 18:07:06,235 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-17 18:07:06,235 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-17 18:07:06,235 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-17 18:07:06,235 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-17 18:07:06,236 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-17 18:07:06,236 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-17 18:07:06,236 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-17 18:07:06,236 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-17 18:07:06,236 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-17 18:07:06,236 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-17 18:07:06,236 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-17 18:07:06,237 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-17 18:07:06,577 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-17 18:07:06,578 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-17 18:07:06,582 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.07 06:07:06 BoogieIcfgContainer [2020-07-17 18:07:06,582 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-17 18:07:06,584 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-17 18:07:06,584 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-17 18:07:06,587 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-17 18:07:06,587 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.07 06:07:05" (1/3) ... [2020-07-17 18:07:06,588 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1bc66308 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.07 06:07:06, skipping insertion in model container [2020-07-17 18:07:06,589 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 06:07:06" (2/3) ... [2020-07-17 18:07:06,589 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1bc66308 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.07 06:07:06, skipping insertion in model container [2020-07-17 18:07:06,589 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.07 06:07:06" (3/3) ... [2020-07-17 18:07:06,591 INFO L109 eAbstractionObserver]: Analyzing ICFG array_3-1.i [2020-07-17 18:07:06,602 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-07-17 18:07:06,615 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-17 18:07:06,626 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-17 18:07:06,645 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-17 18:07:06,646 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-17 18:07:06,646 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-07-17 18:07:06,646 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-17 18:07:06,646 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-17 18:07:06,646 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-17 18:07:06,647 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-17 18:07:06,647 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-17 18:07:06,661 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states. [2020-07-17 18:07:06,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-17 18:07:06,671 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:06,672 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:06,672 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:06,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:06,679 INFO L82 PathProgramCache]: Analyzing trace with hash -2145994368, now seen corresponding path program 1 times [2020-07-17 18:07:06,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:06,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [698054420] [2020-07-17 18:07:06,689 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:06,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:06,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:06,888 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 18:07:06,889 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [698054420] [2020-07-17 18:07:06,891 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 18:07:06,891 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-17 18:07:06,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955128156] [2020-07-17 18:07:06,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-17 18:07:06,896 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:06,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-17 18:07:06,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-17 18:07:06,911 INFO L87 Difference]: Start difference. First operand 39 states. Second operand 3 states. [2020-07-17 18:07:07,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:07,050 INFO L93 Difference]: Finished difference Result 61 states and 70 transitions. [2020-07-17 18:07:07,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-17 18:07:07,052 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-17 18:07:07,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:07,061 INFO L225 Difference]: With dead ends: 61 [2020-07-17 18:07:07,062 INFO L226 Difference]: Without dead ends: 31 [2020-07-17 18:07:07,066 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 [2020-07-17 18:07:07,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-17 18:07:07,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-07-17 18:07:07,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-17 18:07:07,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2020-07-17 18:07:07,109 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 17 [2020-07-17 18:07:07,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:07,110 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2020-07-17 18:07:07,110 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-17 18:07:07,111 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2020-07-17 18:07:07,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-17 18:07:07,112 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:07,112 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:07,113 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-17 18:07:07,113 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:07,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:07,114 INFO L82 PathProgramCache]: Analyzing trace with hash 2141881988, now seen corresponding path program 1 times [2020-07-17 18:07:07,114 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:07,114 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1683242598] [2020-07-17 18:07:07,115 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:07,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:07,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:07,193 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 18:07:07,194 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1683242598] [2020-07-17 18:07:07,194 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 18:07:07,194 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-17 18:07:07,195 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945216921] [2020-07-17 18:07:07,196 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-17 18:07:07,197 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:07,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-17 18:07:07,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-17 18:07:07,198 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 4 states. [2020-07-17 18:07:07,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:07,304 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2020-07-17 18:07:07,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-17 18:07:07,305 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2020-07-17 18:07:07,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:07,308 INFO L225 Difference]: With dead ends: 59 [2020-07-17 18:07:07,308 INFO L226 Difference]: Without dead ends: 45 [2020-07-17 18:07:07,310 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 [2020-07-17 18:07:07,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-17 18:07:07,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 36. [2020-07-17 18:07:07,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-17 18:07:07,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2020-07-17 18:07:07,322 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 19 [2020-07-17 18:07:07,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:07,323 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2020-07-17 18:07:07,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-17 18:07:07,323 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2020-07-17 18:07:07,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-17 18:07:07,324 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:07,325 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:07,325 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-17 18:07:07,325 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:07,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:07,326 INFO L82 PathProgramCache]: Analyzing trace with hash -1000622251, now seen corresponding path program 1 times [2020-07-17 18:07:07,326 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:07,327 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1006730659] [2020-07-17 18:07:07,327 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:07,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:07,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:07,434 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 18:07:07,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1006730659] [2020-07-17 18:07:07,435 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:07,435 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-07-17 18:07:07,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [264362933] [2020-07-17 18:07:07,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-17 18:07:07,436 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:07,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-17 18:07:07,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-07-17 18:07:07,437 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand 6 states. [2020-07-17 18:07:07,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:07,575 INFO L93 Difference]: Finished difference Result 70 states and 76 transitions. [2020-07-17 18:07:07,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-17 18:07:07,576 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 26 [2020-07-17 18:07:07,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:07,577 INFO L225 Difference]: With dead ends: 70 [2020-07-17 18:07:07,578 INFO L226 Difference]: Without dead ends: 52 [2020-07-17 18:07:07,578 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 [2020-07-17 18:07:07,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-17 18:07:07,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 43. [2020-07-17 18:07:07,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-07-17 18:07:07,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2020-07-17 18:07:07,589 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 26 [2020-07-17 18:07:07,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:07,590 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2020-07-17 18:07:07,590 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-17 18:07:07,590 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2020-07-17 18:07:07,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-07-17 18:07:07,591 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:07,592 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:07,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-07-17 18:07:07,592 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:07,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:07,593 INFO L82 PathProgramCache]: Analyzing trace with hash 231352676, now seen corresponding path program 2 times [2020-07-17 18:07:07,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:07,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2079220283] [2020-07-17 18:07:07,594 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:07,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:07,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:07,752 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 18:07:07,752 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2079220283] [2020-07-17 18:07:07,752 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:07,753 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-07-17 18:07:07,753 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179032686] [2020-07-17 18:07:07,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-17 18:07:07,753 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:07,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-17 18:07:07,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-17 18:07:07,754 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 8 states. [2020-07-17 18:07:07,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:07,979 INFO L93 Difference]: Finished difference Result 77 states and 83 transitions. [2020-07-17 18:07:07,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-17 18:07:07,982 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 33 [2020-07-17 18:07:07,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:07,985 INFO L225 Difference]: With dead ends: 77 [2020-07-17 18:07:07,986 INFO L226 Difference]: Without dead ends: 59 [2020-07-17 18:07:07,987 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2020-07-17 18:07:07,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-17 18:07:08,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 50. [2020-07-17 18:07:08,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-17 18:07:08,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 53 transitions. [2020-07-17 18:07:08,007 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 53 transitions. Word has length 33 [2020-07-17 18:07:08,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:08,009 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 53 transitions. [2020-07-17 18:07:08,009 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-17 18:07:08,009 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 53 transitions. [2020-07-17 18:07:08,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-17 18:07:08,011 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:08,012 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:08,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-07-17 18:07:08,012 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:08,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:08,013 INFO L82 PathProgramCache]: Analyzing trace with hash 1221138549, now seen corresponding path program 3 times [2020-07-17 18:07:08,013 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:08,013 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1759067806] [2020-07-17 18:07:08,014 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:08,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:08,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:08,156 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-17 18:07:08,157 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1759067806] [2020-07-17 18:07:08,157 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 18:07:08,158 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-17 18:07:08,158 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480364232] [2020-07-17 18:07:08,158 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-17 18:07:08,159 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:08,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-17 18:07:08,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-17 18:07:08,160 INFO L87 Difference]: Start difference. First operand 50 states and 53 transitions. Second operand 6 states. [2020-07-17 18:07:08,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:08,314 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2020-07-17 18:07:08,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-17 18:07:08,314 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 40 [2020-07-17 18:07:08,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:08,316 INFO L225 Difference]: With dead ends: 58 [2020-07-17 18:07:08,316 INFO L226 Difference]: Without dead ends: 52 [2020-07-17 18:07:08,317 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-17 18:07:08,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-17 18:07:08,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50. [2020-07-17 18:07:08,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-17 18:07:08,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-07-17 18:07:08,335 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 40 [2020-07-17 18:07:08,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:08,339 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-07-17 18:07:08,339 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-17 18:07:08,339 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-07-17 18:07:08,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-07-17 18:07:08,344 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:08,344 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:08,344 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-07-17 18:07:08,344 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:08,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:08,345 INFO L82 PathProgramCache]: Analyzing trace with hash -842063729, now seen corresponding path program 1 times [2020-07-17 18:07:08,345 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:08,349 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [130219087] [2020-07-17 18:07:08,349 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:08,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:08,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:08,448 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-17 18:07:08,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [130219087] [2020-07-17 18:07:08,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:08,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-07-17 18:07:08,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160548955] [2020-07-17 18:07:08,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-17 18:07:08,451 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:08,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-17 18:07:08,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-17 18:07:08,452 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 8 states. [2020-07-17 18:07:08,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:08,611 INFO L93 Difference]: Finished difference Result 68 states and 71 transitions. [2020-07-17 18:07:08,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-17 18:07:08,612 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 47 [2020-07-17 18:07:08,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:08,613 INFO L225 Difference]: With dead ends: 68 [2020-07-17 18:07:08,616 INFO L226 Difference]: Without dead ends: 59 [2020-07-17 18:07:08,617 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2020-07-17 18:07:08,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-17 18:07:08,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 57. [2020-07-17 18:07:08,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-17 18:07:08,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2020-07-17 18:07:08,625 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 47 [2020-07-17 18:07:08,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:08,625 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2020-07-17 18:07:08,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-17 18:07:08,625 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2020-07-17 18:07:08,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-17 18:07:08,627 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:08,627 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:08,627 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-07-17 18:07:08,631 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:08,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:08,639 INFO L82 PathProgramCache]: Analyzing trace with hash 1280223029, now seen corresponding path program 2 times [2020-07-17 18:07:08,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:08,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [72054718] [2020-07-17 18:07:08,640 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:08,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:08,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:08,746 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:08,747 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [72054718] [2020-07-17 18:07:08,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:08,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-07-17 18:07:08,748 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070773410] [2020-07-17 18:07:08,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-17 18:07:08,749 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:08,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-17 18:07:08,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-07-17 18:07:08,750 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand 10 states. [2020-07-17 18:07:08,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:08,967 INFO L93 Difference]: Finished difference Result 94 states and 98 transitions. [2020-07-17 18:07:08,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-17 18:07:08,968 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 54 [2020-07-17 18:07:08,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:08,971 INFO L225 Difference]: With dead ends: 94 [2020-07-17 18:07:08,971 INFO L226 Difference]: Without dead ends: 69 [2020-07-17 18:07:08,973 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 [2020-07-17 18:07:08,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-07-17 18:07:08,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 64. [2020-07-17 18:07:08,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-17 18:07:08,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-07-17 18:07:08,991 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 54 [2020-07-17 18:07:08,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:08,993 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-07-17 18:07:08,993 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-17 18:07:08,993 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-07-17 18:07:08,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-17 18:07:08,996 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:08,999 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:09,000 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-07-17 18:07:09,000 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:09,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:09,000 INFO L82 PathProgramCache]: Analyzing trace with hash 1143766212, now seen corresponding path program 3 times [2020-07-17 18:07:09,001 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:09,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [349376414] [2020-07-17 18:07:09,001 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:09,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:09,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:09,162 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:09,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [349376414] [2020-07-17 18:07:09,163 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:09,163 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-07-17 18:07:09,163 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761428591] [2020-07-17 18:07:09,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-17 18:07:09,164 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:09,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-17 18:07:09,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2020-07-17 18:07:09,165 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 12 states. [2020-07-17 18:07:09,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:09,356 INFO L93 Difference]: Finished difference Result 101 states and 105 transitions. [2020-07-17 18:07:09,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-17 18:07:09,356 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 61 [2020-07-17 18:07:09,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:09,357 INFO L225 Difference]: With dead ends: 101 [2020-07-17 18:07:09,358 INFO L226 Difference]: Without dead ends: 76 [2020-07-17 18:07:09,358 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 [2020-07-17 18:07:09,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-17 18:07:09,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 71. [2020-07-17 18:07:09,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-17 18:07:09,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2020-07-17 18:07:09,380 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 61 [2020-07-17 18:07:09,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:09,380 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2020-07-17 18:07:09,380 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-17 18:07:09,380 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2020-07-17 18:07:09,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-17 18:07:09,384 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:09,384 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:09,384 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-07-17 18:07:09,385 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:09,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:09,385 INFO L82 PathProgramCache]: Analyzing trace with hash -1966270379, now seen corresponding path program 4 times [2020-07-17 18:07:09,385 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:09,386 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1634816907] [2020-07-17 18:07:09,386 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:09,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:09,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:09,538 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 75 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:09,539 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1634816907] [2020-07-17 18:07:09,539 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:09,539 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-07-17 18:07:09,540 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520448403] [2020-07-17 18:07:09,540 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-17 18:07:09,540 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:09,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-17 18:07:09,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2020-07-17 18:07:09,541 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand 14 states. [2020-07-17 18:07:09,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:09,831 INFO L93 Difference]: Finished difference Result 108 states and 112 transitions. [2020-07-17 18:07:09,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-17 18:07:09,831 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 68 [2020-07-17 18:07:09,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:09,833 INFO L225 Difference]: With dead ends: 108 [2020-07-17 18:07:09,833 INFO L226 Difference]: Without dead ends: 83 [2020-07-17 18:07:09,834 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=180, Invalid=372, Unknown=0, NotChecked=0, Total=552 [2020-07-17 18:07:09,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-17 18:07:09,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 78. [2020-07-17 18:07:09,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-17 18:07:09,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-07-17 18:07:09,847 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 68 [2020-07-17 18:07:09,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:09,848 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-07-17 18:07:09,848 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-17 18:07:09,848 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-07-17 18:07:09,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-07-17 18:07:09,849 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:09,849 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:09,849 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-07-17 18:07:09,849 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:09,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:09,850 INFO L82 PathProgramCache]: Analyzing trace with hash -1126004828, now seen corresponding path program 5 times [2020-07-17 18:07:09,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:09,850 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1779480914] [2020-07-17 18:07:09,851 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:09,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:10,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:10,057 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 111 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:10,057 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1779480914] [2020-07-17 18:07:10,058 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:10,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-07-17 18:07:10,058 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829099335] [2020-07-17 18:07:10,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-17 18:07:10,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:10,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-17 18:07:10,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2020-07-17 18:07:10,062 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 16 states. [2020-07-17 18:07:10,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:10,372 INFO L93 Difference]: Finished difference Result 115 states and 119 transitions. [2020-07-17 18:07:10,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-17 18:07:10,373 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 75 [2020-07-17 18:07:10,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:10,374 INFO L225 Difference]: With dead ends: 115 [2020-07-17 18:07:10,374 INFO L226 Difference]: Without dead ends: 90 [2020-07-17 18:07:10,376 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=245, Invalid=511, Unknown=0, NotChecked=0, Total=756 [2020-07-17 18:07:10,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-17 18:07:10,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 85. [2020-07-17 18:07:10,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-07-17 18:07:10,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2020-07-17 18:07:10,385 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 75 [2020-07-17 18:07:10,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:10,386 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2020-07-17 18:07:10,386 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-17 18:07:10,386 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2020-07-17 18:07:10,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-17 18:07:10,388 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:10,388 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:10,389 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-07-17 18:07:10,389 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:10,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:10,389 INFO L82 PathProgramCache]: Analyzing trace with hash -1440804491, now seen corresponding path program 6 times [2020-07-17 18:07:10,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:10,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1795417054] [2020-07-17 18:07:10,390 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:10,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:10,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:10,586 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 154 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:10,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1795417054] [2020-07-17 18:07:10,587 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:10,587 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-07-17 18:07:10,587 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561620103] [2020-07-17 18:07:10,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-17 18:07:10,588 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:10,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-17 18:07:10,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=224, Unknown=0, NotChecked=0, Total=306 [2020-07-17 18:07:10,588 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand 18 states. [2020-07-17 18:07:10,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:10,947 INFO L93 Difference]: Finished difference Result 122 states and 126 transitions. [2020-07-17 18:07:10,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-17 18:07:10,948 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 82 [2020-07-17 18:07:10,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:10,949 INFO L225 Difference]: With dead ends: 122 [2020-07-17 18:07:10,949 INFO L226 Difference]: Without dead ends: 97 [2020-07-17 18:07:10,951 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=320, Invalid=672, Unknown=0, NotChecked=0, Total=992 [2020-07-17 18:07:10,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-17 18:07:10,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 92. [2020-07-17 18:07:10,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-17 18:07:10,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2020-07-17 18:07:10,971 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 82 [2020-07-17 18:07:10,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:10,972 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2020-07-17 18:07:10,972 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-17 18:07:10,972 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2020-07-17 18:07:10,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-07-17 18:07:10,976 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:10,980 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:10,981 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-07-17 18:07:10,981 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:10,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:10,981 INFO L82 PathProgramCache]: Analyzing trace with hash -247723388, now seen corresponding path program 7 times [2020-07-17 18:07:10,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:10,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [824976840] [2020-07-17 18:07:10,982 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:11,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:11,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:11,221 INFO L134 CoverageAnalysis]: Checked inductivity of 215 backedges. 0 proven. 204 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:11,221 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [824976840] [2020-07-17 18:07:11,221 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:11,222 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-07-17 18:07:11,222 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566725532] [2020-07-17 18:07:11,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-17 18:07:11,223 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:11,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-17 18:07:11,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=279, Unknown=0, NotChecked=0, Total=380 [2020-07-17 18:07:11,224 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand 20 states. [2020-07-17 18:07:11,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:11,640 INFO L93 Difference]: Finished difference Result 129 states and 133 transitions. [2020-07-17 18:07:11,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-17 18:07:11,640 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 89 [2020-07-17 18:07:11,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:11,642 INFO L225 Difference]: With dead ends: 129 [2020-07-17 18:07:11,642 INFO L226 Difference]: Without dead ends: 104 [2020-07-17 18:07:11,643 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=405, Invalid=855, Unknown=0, NotChecked=0, Total=1260 [2020-07-17 18:07:11,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-07-17 18:07:11,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 99. [2020-07-17 18:07:11,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-07-17 18:07:11,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 101 transitions. [2020-07-17 18:07:11,662 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 101 transitions. Word has length 89 [2020-07-17 18:07:11,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:11,663 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 101 transitions. [2020-07-17 18:07:11,663 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-17 18:07:11,663 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 101 transitions. [2020-07-17 18:07:11,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-17 18:07:11,669 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:11,669 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:11,669 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-07-17 18:07:11,670 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:11,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:11,670 INFO L82 PathProgramCache]: Analyzing trace with hash -847867243, now seen corresponding path program 8 times [2020-07-17 18:07:11,670 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:11,671 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [833399535] [2020-07-17 18:07:11,671 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:11,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:11,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:11,945 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 261 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:11,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [833399535] [2020-07-17 18:07:11,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:11,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-07-17 18:07:11,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119012080] [2020-07-17 18:07:11,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-17 18:07:11,947 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:11,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-17 18:07:11,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=340, Unknown=0, NotChecked=0, Total=462 [2020-07-17 18:07:11,948 INFO L87 Difference]: Start difference. First operand 99 states and 101 transitions. Second operand 22 states. [2020-07-17 18:07:12,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:12,459 INFO L93 Difference]: Finished difference Result 136 states and 140 transitions. [2020-07-17 18:07:12,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-17 18:07:12,460 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 96 [2020-07-17 18:07:12,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:12,461 INFO L225 Difference]: With dead ends: 136 [2020-07-17 18:07:12,462 INFO L226 Difference]: Without dead ends: 111 [2020-07-17 18:07:12,465 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=500, Invalid=1060, Unknown=0, NotChecked=0, Total=1560 [2020-07-17 18:07:12,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2020-07-17 18:07:12,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 106. [2020-07-17 18:07:12,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-07-17 18:07:12,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 108 transitions. [2020-07-17 18:07:12,472 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 108 transitions. Word has length 96 [2020-07-17 18:07:12,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:12,473 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 108 transitions. [2020-07-17 18:07:12,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-17 18:07:12,473 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 108 transitions. [2020-07-17 18:07:12,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-17 18:07:12,474 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:12,474 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:12,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-07-17 18:07:12,475 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:12,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:12,475 INFO L82 PathProgramCache]: Analyzing trace with hash 566691172, now seen corresponding path program 9 times [2020-07-17 18:07:12,475 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:12,476 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1725283162] [2020-07-17 18:07:12,476 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:12,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:12,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:12,824 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:12,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1725283162] [2020-07-17 18:07:12,825 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:12,825 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-07-17 18:07:12,825 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229244475] [2020-07-17 18:07:12,826 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-17 18:07:12,826 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:12,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-17 18:07:12,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=407, Unknown=0, NotChecked=0, Total=552 [2020-07-17 18:07:12,827 INFO L87 Difference]: Start difference. First operand 106 states and 108 transitions. Second operand 24 states. [2020-07-17 18:07:13,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:13,345 INFO L93 Difference]: Finished difference Result 143 states and 147 transitions. [2020-07-17 18:07:13,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-17 18:07:13,345 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 103 [2020-07-17 18:07:13,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:13,347 INFO L225 Difference]: With dead ends: 143 [2020-07-17 18:07:13,347 INFO L226 Difference]: Without dead ends: 118 [2020-07-17 18:07:13,348 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=605, Invalid=1287, Unknown=0, NotChecked=0, Total=1892 [2020-07-17 18:07:13,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-17 18:07:13,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 113. [2020-07-17 18:07:13,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-07-17 18:07:13,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 115 transitions. [2020-07-17 18:07:13,358 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 115 transitions. Word has length 103 [2020-07-17 18:07:13,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:13,360 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 115 transitions. [2020-07-17 18:07:13,360 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-17 18:07:13,360 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 115 transitions. [2020-07-17 18:07:13,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-07-17 18:07:13,361 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:13,362 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:13,362 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-07-17 18:07:13,362 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:13,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:13,362 INFO L82 PathProgramCache]: Analyzing trace with hash -1736074315, now seen corresponding path program 10 times [2020-07-17 18:07:13,363 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:13,364 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [736420521] [2020-07-17 18:07:13,364 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:13,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:13,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:13,806 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 396 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:13,806 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [736420521] [2020-07-17 18:07:13,806 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:13,807 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-07-17 18:07:13,807 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048185816] [2020-07-17 18:07:13,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-17 18:07:13,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:13,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-17 18:07:13,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=480, Unknown=0, NotChecked=0, Total=650 [2020-07-17 18:07:13,809 INFO L87 Difference]: Start difference. First operand 113 states and 115 transitions. Second operand 26 states. [2020-07-17 18:07:14,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:14,583 INFO L93 Difference]: Finished difference Result 150 states and 154 transitions. [2020-07-17 18:07:14,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-07-17 18:07:14,585 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 110 [2020-07-17 18:07:14,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:14,587 INFO L225 Difference]: With dead ends: 150 [2020-07-17 18:07:14,587 INFO L226 Difference]: Without dead ends: 125 [2020-07-17 18:07:14,588 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 362 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=720, Invalid=1536, Unknown=0, NotChecked=0, Total=2256 [2020-07-17 18:07:14,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2020-07-17 18:07:14,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 120. [2020-07-17 18:07:14,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-07-17 18:07:14,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 122 transitions. [2020-07-17 18:07:14,597 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 122 transitions. Word has length 110 [2020-07-17 18:07:14,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:14,598 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 122 transitions. [2020-07-17 18:07:14,598 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-17 18:07:14,598 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 122 transitions. [2020-07-17 18:07:14,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-17 18:07:14,600 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:14,600 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 12, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:14,601 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-07-17 18:07:14,601 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:14,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:14,601 INFO L82 PathProgramCache]: Analyzing trace with hash 2123462724, now seen corresponding path program 11 times [2020-07-17 18:07:14,602 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:14,602 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [230499589] [2020-07-17 18:07:14,602 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:14,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:14,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:14,970 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 0 proven. 474 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:14,970 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [230499589] [2020-07-17 18:07:14,970 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:14,970 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-07-17 18:07:14,971 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981232224] [2020-07-17 18:07:14,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-17 18:07:14,971 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:14,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-17 18:07:14,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=559, Unknown=0, NotChecked=0, Total=756 [2020-07-17 18:07:14,972 INFO L87 Difference]: Start difference. First operand 120 states and 122 transitions. Second operand 28 states. [2020-07-17 18:07:15,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:15,687 INFO L93 Difference]: Finished difference Result 157 states and 161 transitions. [2020-07-17 18:07:15,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-17 18:07:15,687 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 117 [2020-07-17 18:07:15,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:15,688 INFO L225 Difference]: With dead ends: 157 [2020-07-17 18:07:15,689 INFO L226 Difference]: Without dead ends: 132 [2020-07-17 18:07:15,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 431 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=845, Invalid=1807, Unknown=0, NotChecked=0, Total=2652 [2020-07-17 18:07:15,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2020-07-17 18:07:15,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 127. [2020-07-17 18:07:15,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-07-17 18:07:15,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 129 transitions. [2020-07-17 18:07:15,697 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 129 transitions. Word has length 117 [2020-07-17 18:07:15,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:15,698 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 129 transitions. [2020-07-17 18:07:15,698 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-17 18:07:15,698 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 129 transitions. [2020-07-17 18:07:15,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-07-17 18:07:15,699 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:15,700 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 13, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:15,700 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-07-17 18:07:15,700 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:15,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:15,700 INFO L82 PathProgramCache]: Analyzing trace with hash 1333669077, now seen corresponding path program 12 times [2020-07-17 18:07:15,701 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:15,701 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [343455657] [2020-07-17 18:07:15,701 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:15,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:16,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:16,124 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 559 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:16,125 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [343455657] [2020-07-17 18:07:16,125 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:16,125 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-07-17 18:07:16,125 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025579981] [2020-07-17 18:07:16,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-17 18:07:16,126 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:16,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-17 18:07:16,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=644, Unknown=0, NotChecked=0, Total=870 [2020-07-17 18:07:16,127 INFO L87 Difference]: Start difference. First operand 127 states and 129 transitions. Second operand 30 states. [2020-07-17 18:07:16,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:16,948 INFO L93 Difference]: Finished difference Result 164 states and 168 transitions. [2020-07-17 18:07:16,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-07-17 18:07:16,948 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 124 [2020-07-17 18:07:16,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:16,949 INFO L225 Difference]: With dead ends: 164 [2020-07-17 18:07:16,949 INFO L226 Difference]: Without dead ends: 139 [2020-07-17 18:07:16,951 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=980, Invalid=2100, Unknown=0, NotChecked=0, Total=3080 [2020-07-17 18:07:16,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2020-07-17 18:07:16,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 134. [2020-07-17 18:07:16,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2020-07-17 18:07:16,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 136 transitions. [2020-07-17 18:07:16,958 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 136 transitions. Word has length 124 [2020-07-17 18:07:16,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:16,958 INFO L479 AbstractCegarLoop]: Abstraction has 134 states and 136 transitions. [2020-07-17 18:07:16,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-17 18:07:16,958 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 136 transitions. [2020-07-17 18:07:16,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2020-07-17 18:07:16,960 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:16,960 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 14, 14, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:16,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-07-17 18:07:16,960 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:16,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:16,961 INFO L82 PathProgramCache]: Analyzing trace with hash 120152868, now seen corresponding path program 13 times [2020-07-17 18:07:16,961 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:16,961 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [199801334] [2020-07-17 18:07:16,961 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:16,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:17,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:17,413 INFO L134 CoverageAnalysis]: Checked inductivity of 662 backedges. 0 proven. 651 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:17,413 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [199801334] [2020-07-17 18:07:17,414 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:17,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-07-17 18:07:17,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172172779] [2020-07-17 18:07:17,415 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-17 18:07:17,415 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:17,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-17 18:07:17,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=735, Unknown=0, NotChecked=0, Total=992 [2020-07-17 18:07:17,416 INFO L87 Difference]: Start difference. First operand 134 states and 136 transitions. Second operand 32 states. [2020-07-17 18:07:18,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:18,287 INFO L93 Difference]: Finished difference Result 171 states and 175 transitions. [2020-07-17 18:07:18,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-17 18:07:18,288 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 131 [2020-07-17 18:07:18,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:18,290 INFO L225 Difference]: With dead ends: 171 [2020-07-17 18:07:18,290 INFO L226 Difference]: Without dead ends: 146 [2020-07-17 18:07:18,292 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 587 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1125, Invalid=2415, Unknown=0, NotChecked=0, Total=3540 [2020-07-17 18:07:18,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2020-07-17 18:07:18,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 141. [2020-07-17 18:07:18,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2020-07-17 18:07:18,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2020-07-17 18:07:18,303 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 131 [2020-07-17 18:07:18,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:18,304 INFO L479 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2020-07-17 18:07:18,304 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-17 18:07:18,304 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2020-07-17 18:07:18,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2020-07-17 18:07:18,306 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:18,307 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 15, 15, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:18,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-07-17 18:07:18,308 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:18,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:18,308 INFO L82 PathProgramCache]: Analyzing trace with hash -149797387, now seen corresponding path program 14 times [2020-07-17 18:07:18,310 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:18,310 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1047720648] [2020-07-17 18:07:18,310 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:18,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:18,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:18,829 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 750 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:18,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1047720648] [2020-07-17 18:07:18,829 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:18,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-07-17 18:07:18,830 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317266591] [2020-07-17 18:07:18,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-17 18:07:18,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:18,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-17 18:07:18,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=832, Unknown=0, NotChecked=0, Total=1122 [2020-07-17 18:07:18,831 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand 34 states. [2020-07-17 18:07:19,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:19,805 INFO L93 Difference]: Finished difference Result 178 states and 182 transitions. [2020-07-17 18:07:19,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-07-17 18:07:19,806 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 138 [2020-07-17 18:07:19,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:19,808 INFO L225 Difference]: With dead ends: 178 [2020-07-17 18:07:19,808 INFO L226 Difference]: Without dead ends: 153 [2020-07-17 18:07:19,809 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 674 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1280, Invalid=2752, Unknown=0, NotChecked=0, Total=4032 [2020-07-17 18:07:19,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2020-07-17 18:07:19,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 148. [2020-07-17 18:07:19,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2020-07-17 18:07:19,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 150 transitions. [2020-07-17 18:07:19,817 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 150 transitions. Word has length 138 [2020-07-17 18:07:19,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:19,818 INFO L479 AbstractCegarLoop]: Abstraction has 148 states and 150 transitions. [2020-07-17 18:07:19,818 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-17 18:07:19,818 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 150 transitions. [2020-07-17 18:07:19,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-17 18:07:19,821 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:19,822 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 16, 16, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:19,822 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-07-17 18:07:19,822 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:19,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:19,822 INFO L82 PathProgramCache]: Analyzing trace with hash 1788659204, now seen corresponding path program 15 times [2020-07-17 18:07:19,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:19,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [520633972] [2020-07-17 18:07:19,823 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:19,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:20,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:20,401 INFO L134 CoverageAnalysis]: Checked inductivity of 867 backedges. 0 proven. 856 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:20,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [520633972] [2020-07-17 18:07:20,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:20,402 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-07-17 18:07:20,402 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099438175] [2020-07-17 18:07:20,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-17 18:07:20,403 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:20,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-17 18:07:20,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=935, Unknown=0, NotChecked=0, Total=1260 [2020-07-17 18:07:20,404 INFO L87 Difference]: Start difference. First operand 148 states and 150 transitions. Second operand 36 states. [2020-07-17 18:07:21,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:21,454 INFO L93 Difference]: Finished difference Result 185 states and 189 transitions. [2020-07-17 18:07:21,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-17 18:07:21,455 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 145 [2020-07-17 18:07:21,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:21,456 INFO L225 Difference]: With dead ends: 185 [2020-07-17 18:07:21,457 INFO L226 Difference]: Without dead ends: 160 [2020-07-17 18:07:21,458 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 767 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1445, Invalid=3111, Unknown=0, NotChecked=0, Total=4556 [2020-07-17 18:07:21,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2020-07-17 18:07:21,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 155. [2020-07-17 18:07:21,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 155 states. [2020-07-17 18:07:21,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 157 transitions. [2020-07-17 18:07:21,468 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 157 transitions. Word has length 145 [2020-07-17 18:07:21,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:21,469 INFO L479 AbstractCegarLoop]: Abstraction has 155 states and 157 transitions. [2020-07-17 18:07:21,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-17 18:07:21,469 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 157 transitions. [2020-07-17 18:07:21,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2020-07-17 18:07:21,470 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:21,470 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 17, 17, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:21,471 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-07-17 18:07:21,471 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:21,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:21,471 INFO L82 PathProgramCache]: Analyzing trace with hash 1953752853, now seen corresponding path program 16 times [2020-07-17 18:07:21,471 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:21,472 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1126878081] [2020-07-17 18:07:21,472 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:21,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:22,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:22,112 INFO L134 CoverageAnalysis]: Checked inductivity of 980 backedges. 0 proven. 969 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:22,112 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1126878081] [2020-07-17 18:07:22,112 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:22,113 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-07-17 18:07:22,113 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235115516] [2020-07-17 18:07:22,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-17 18:07:22,114 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:22,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-17 18:07:22,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=362, Invalid=1044, Unknown=0, NotChecked=0, Total=1406 [2020-07-17 18:07:22,115 INFO L87 Difference]: Start difference. First operand 155 states and 157 transitions. Second operand 38 states. [2020-07-17 18:07:23,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:23,264 INFO L93 Difference]: Finished difference Result 192 states and 196 transitions. [2020-07-17 18:07:23,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-07-17 18:07:23,265 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 152 [2020-07-17 18:07:23,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:23,267 INFO L225 Difference]: With dead ends: 192 [2020-07-17 18:07:23,267 INFO L226 Difference]: Without dead ends: 167 [2020-07-17 18:07:23,269 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 866 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1620, Invalid=3492, Unknown=0, NotChecked=0, Total=5112 [2020-07-17 18:07:23,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2020-07-17 18:07:23,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 162. [2020-07-17 18:07:23,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2020-07-17 18:07:23,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 164 transitions. [2020-07-17 18:07:23,276 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 164 transitions. Word has length 152 [2020-07-17 18:07:23,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:23,277 INFO L479 AbstractCegarLoop]: Abstraction has 162 states and 164 transitions. [2020-07-17 18:07:23,277 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-17 18:07:23,277 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 164 transitions. [2020-07-17 18:07:23,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2020-07-17 18:07:23,279 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:23,279 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 18, 18, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:23,279 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-07-17 18:07:23,279 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:23,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:23,280 INFO L82 PathProgramCache]: Analyzing trace with hash -411459356, now seen corresponding path program 17 times [2020-07-17 18:07:23,280 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:23,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1299471357] [2020-07-17 18:07:23,280 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:23,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:23,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:23,948 INFO L134 CoverageAnalysis]: Checked inductivity of 1100 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:23,949 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1299471357] [2020-07-17 18:07:23,949 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:23,949 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-07-17 18:07:23,950 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527901046] [2020-07-17 18:07:23,950 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-17 18:07:23,950 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:23,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-17 18:07:23,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=401, Invalid=1159, Unknown=0, NotChecked=0, Total=1560 [2020-07-17 18:07:23,951 INFO L87 Difference]: Start difference. First operand 162 states and 164 transitions. Second operand 40 states. [2020-07-17 18:07:25,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:25,236 INFO L93 Difference]: Finished difference Result 199 states and 203 transitions. [2020-07-17 18:07:25,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-07-17 18:07:25,238 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 159 [2020-07-17 18:07:25,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:25,240 INFO L225 Difference]: With dead ends: 199 [2020-07-17 18:07:25,240 INFO L226 Difference]: Without dead ends: 174 [2020-07-17 18:07:25,245 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 971 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1805, Invalid=3895, Unknown=0, NotChecked=0, Total=5700 [2020-07-17 18:07:25,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2020-07-17 18:07:25,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 169. [2020-07-17 18:07:25,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2020-07-17 18:07:25,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 171 transitions. [2020-07-17 18:07:25,256 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 171 transitions. Word has length 159 [2020-07-17 18:07:25,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:25,256 INFO L479 AbstractCegarLoop]: Abstraction has 169 states and 171 transitions. [2020-07-17 18:07:25,256 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-17 18:07:25,256 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 171 transitions. [2020-07-17 18:07:25,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2020-07-17 18:07:25,257 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:25,258 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 19, 19, 19, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:25,258 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-07-17 18:07:25,258 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:25,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:25,258 INFO L82 PathProgramCache]: Analyzing trace with hash -1386934219, now seen corresponding path program 18 times [2020-07-17 18:07:25,259 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:25,265 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1083877226] [2020-07-17 18:07:25,265 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:25,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:26,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:26,216 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 0 proven. 1216 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:26,225 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1083877226] [2020-07-17 18:07:26,226 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:26,227 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-07-17 18:07:26,227 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504987901] [2020-07-17 18:07:26,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-07-17 18:07:26,230 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:26,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-07-17 18:07:26,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=442, Invalid=1280, Unknown=0, NotChecked=0, Total=1722 [2020-07-17 18:07:26,232 INFO L87 Difference]: Start difference. First operand 169 states and 171 transitions. Second operand 42 states. [2020-07-17 18:07:27,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:27,950 INFO L93 Difference]: Finished difference Result 206 states and 210 transitions. [2020-07-17 18:07:27,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-07-17 18:07:27,951 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 166 [2020-07-17 18:07:27,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:27,953 INFO L225 Difference]: With dead ends: 206 [2020-07-17 18:07:27,953 INFO L226 Difference]: Without dead ends: 181 [2020-07-17 18:07:27,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1082 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2000, Invalid=4320, Unknown=0, NotChecked=0, Total=6320 [2020-07-17 18:07:27,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2020-07-17 18:07:27,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 176. [2020-07-17 18:07:27,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-17 18:07:27,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 178 transitions. [2020-07-17 18:07:27,963 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 178 transitions. Word has length 166 [2020-07-17 18:07:27,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:27,963 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 178 transitions. [2020-07-17 18:07:27,963 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-07-17 18:07:27,963 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 178 transitions. [2020-07-17 18:07:27,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2020-07-17 18:07:27,964 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:27,964 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 20, 20, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:27,965 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-07-17 18:07:27,965 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:27,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:27,965 INFO L82 PathProgramCache]: Analyzing trace with hash 734917572, now seen corresponding path program 19 times [2020-07-17 18:07:27,965 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:27,966 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1259912007] [2020-07-17 18:07:27,966 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:28,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:28,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:28,809 INFO L134 CoverageAnalysis]: Checked inductivity of 1361 backedges. 0 proven. 1350 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:28,809 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1259912007] [2020-07-17 18:07:28,809 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:28,810 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-07-17 18:07:28,810 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335056108] [2020-07-17 18:07:28,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-17 18:07:28,810 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:28,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-17 18:07:28,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=485, Invalid=1407, Unknown=0, NotChecked=0, Total=1892 [2020-07-17 18:07:28,811 INFO L87 Difference]: Start difference. First operand 176 states and 178 transitions. Second operand 44 states. [2020-07-17 18:07:30,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:30,352 INFO L93 Difference]: Finished difference Result 213 states and 217 transitions. [2020-07-17 18:07:30,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-17 18:07:30,352 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 173 [2020-07-17 18:07:30,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:30,354 INFO L225 Difference]: With dead ends: 213 [2020-07-17 18:07:30,354 INFO L226 Difference]: Without dead ends: 188 [2020-07-17 18:07:30,357 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1199 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2205, Invalid=4767, Unknown=0, NotChecked=0, Total=6972 [2020-07-17 18:07:30,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2020-07-17 18:07:30,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 183. [2020-07-17 18:07:30,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2020-07-17 18:07:30,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 185 transitions. [2020-07-17 18:07:30,365 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 185 transitions. Word has length 173 [2020-07-17 18:07:30,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:30,365 INFO L479 AbstractCegarLoop]: Abstraction has 183 states and 185 transitions. [2020-07-17 18:07:30,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-17 18:07:30,366 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 185 transitions. [2020-07-17 18:07:30,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2020-07-17 18:07:30,367 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:30,367 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 21, 21, 21, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:30,367 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-07-17 18:07:30,367 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:30,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:30,368 INFO L82 PathProgramCache]: Analyzing trace with hash -1477983915, now seen corresponding path program 20 times [2020-07-17 18:07:30,368 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:30,368 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1701904106] [2020-07-17 18:07:30,368 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:30,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:31,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:31,209 INFO L134 CoverageAnalysis]: Checked inductivity of 1502 backedges. 0 proven. 1491 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:31,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1701904106] [2020-07-17 18:07:31,210 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:31,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-07-17 18:07:31,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982539211] [2020-07-17 18:07:31,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-07-17 18:07:31,210 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:31,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-07-17 18:07:31,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=1540, Unknown=0, NotChecked=0, Total=2070 [2020-07-17 18:07:31,211 INFO L87 Difference]: Start difference. First operand 183 states and 185 transitions. Second operand 46 states. [2020-07-17 18:07:32,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:32,700 INFO L93 Difference]: Finished difference Result 220 states and 224 transitions. [2020-07-17 18:07:32,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-17 18:07:32,701 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 180 [2020-07-17 18:07:32,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:32,703 INFO L225 Difference]: With dead ends: 220 [2020-07-17 18:07:32,703 INFO L226 Difference]: Without dead ends: 195 [2020-07-17 18:07:32,704 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1322 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2420, Invalid=5236, Unknown=0, NotChecked=0, Total=7656 [2020-07-17 18:07:32,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2020-07-17 18:07:32,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 190. [2020-07-17 18:07:32,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-17 18:07:32,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 192 transitions. [2020-07-17 18:07:32,713 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 192 transitions. Word has length 180 [2020-07-17 18:07:32,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:32,713 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 192 transitions. [2020-07-17 18:07:32,713 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-07-17 18:07:32,713 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 192 transitions. [2020-07-17 18:07:32,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2020-07-17 18:07:32,715 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:32,715 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 22, 22, 22, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:32,715 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-07-17 18:07:32,715 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:32,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:32,715 INFO L82 PathProgramCache]: Analyzing trace with hash 891797156, now seen corresponding path program 21 times [2020-07-17 18:07:32,716 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:32,716 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [981668429] [2020-07-17 18:07:32,716 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:32,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:33,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:33,751 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1639 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:33,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [981668429] [2020-07-17 18:07:33,751 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:33,751 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-07-17 18:07:33,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180843129] [2020-07-17 18:07:33,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-17 18:07:33,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:33,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-17 18:07:33,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=577, Invalid=1679, Unknown=0, NotChecked=0, Total=2256 [2020-07-17 18:07:33,753 INFO L87 Difference]: Start difference. First operand 190 states and 192 transitions. Second operand 48 states. [2020-07-17 18:07:35,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:35,310 INFO L93 Difference]: Finished difference Result 227 states and 231 transitions. [2020-07-17 18:07:35,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-17 18:07:35,311 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 187 [2020-07-17 18:07:35,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:35,313 INFO L225 Difference]: With dead ends: 227 [2020-07-17 18:07:35,313 INFO L226 Difference]: Without dead ends: 202 [2020-07-17 18:07:35,315 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1451 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2645, Invalid=5727, Unknown=0, NotChecked=0, Total=8372 [2020-07-17 18:07:35,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-17 18:07:35,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 197. [2020-07-17 18:07:35,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2020-07-17 18:07:35,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 199 transitions. [2020-07-17 18:07:35,322 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 199 transitions. Word has length 187 [2020-07-17 18:07:35,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:35,322 INFO L479 AbstractCegarLoop]: Abstraction has 197 states and 199 transitions. [2020-07-17 18:07:35,322 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-17 18:07:35,323 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 199 transitions. [2020-07-17 18:07:35,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2020-07-17 18:07:35,324 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:35,324 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 23, 23, 23, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:35,324 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-07-17 18:07:35,324 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:35,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:35,325 INFO L82 PathProgramCache]: Analyzing trace with hash -1428293003, now seen corresponding path program 22 times [2020-07-17 18:07:35,325 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:35,325 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [931035784] [2020-07-17 18:07:35,325 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:35,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:36,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:36,360 INFO L134 CoverageAnalysis]: Checked inductivity of 1805 backedges. 0 proven. 1794 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:36,360 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [931035784] [2020-07-17 18:07:36,361 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:36,361 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-07-17 18:07:36,361 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897516194] [2020-07-17 18:07:36,361 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-17 18:07:36,362 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:36,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-17 18:07:36,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=626, Invalid=1824, Unknown=0, NotChecked=0, Total=2450 [2020-07-17 18:07:36,362 INFO L87 Difference]: Start difference. First operand 197 states and 199 transitions. Second operand 50 states. [2020-07-17 18:07:38,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:38,238 INFO L93 Difference]: Finished difference Result 234 states and 238 transitions. [2020-07-17 18:07:38,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2020-07-17 18:07:38,239 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 194 [2020-07-17 18:07:38,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:38,241 INFO L225 Difference]: With dead ends: 234 [2020-07-17 18:07:38,241 INFO L226 Difference]: Without dead ends: 209 [2020-07-17 18:07:38,243 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1586 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2880, Invalid=6240, Unknown=0, NotChecked=0, Total=9120 [2020-07-17 18:07:38,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-17 18:07:38,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 204. [2020-07-17 18:07:38,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-17 18:07:38,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 206 transitions. [2020-07-17 18:07:38,250 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 206 transitions. Word has length 194 [2020-07-17 18:07:38,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:38,251 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 206 transitions. [2020-07-17 18:07:38,251 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-17 18:07:38,251 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 206 transitions. [2020-07-17 18:07:38,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-17 18:07:38,252 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:38,252 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 24, 24, 24, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:38,253 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-07-17 18:07:38,253 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:38,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:38,253 INFO L82 PathProgramCache]: Analyzing trace with hash 815071620, now seen corresponding path program 23 times [2020-07-17 18:07:38,253 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:38,253 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1580026280] [2020-07-17 18:07:38,254 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:38,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:39,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:39,403 INFO L134 CoverageAnalysis]: Checked inductivity of 1967 backedges. 0 proven. 1956 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:39,404 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1580026280] [2020-07-17 18:07:39,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:39,404 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2020-07-17 18:07:39,404 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595735334] [2020-07-17 18:07:39,404 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-07-17 18:07:39,405 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:39,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-07-17 18:07:39,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=677, Invalid=1975, Unknown=0, NotChecked=0, Total=2652 [2020-07-17 18:07:39,406 INFO L87 Difference]: Start difference. First operand 204 states and 206 transitions. Second operand 52 states. [2020-07-17 18:07:41,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:41,456 INFO L93 Difference]: Finished difference Result 241 states and 245 transitions. [2020-07-17 18:07:41,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2020-07-17 18:07:41,457 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 201 [2020-07-17 18:07:41,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:41,459 INFO L225 Difference]: With dead ends: 241 [2020-07-17 18:07:41,459 INFO L226 Difference]: Without dead ends: 216 [2020-07-17 18:07:41,461 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1727 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=3125, Invalid=6775, Unknown=0, NotChecked=0, Total=9900 [2020-07-17 18:07:41,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2020-07-17 18:07:41,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 211. [2020-07-17 18:07:41,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 211 states. [2020-07-17 18:07:41,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 213 transitions. [2020-07-17 18:07:41,467 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 213 transitions. Word has length 201 [2020-07-17 18:07:41,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:41,468 INFO L479 AbstractCegarLoop]: Abstraction has 211 states and 213 transitions. [2020-07-17 18:07:41,468 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-07-17 18:07:41,468 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 213 transitions. [2020-07-17 18:07:41,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-07-17 18:07:41,469 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:41,469 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 25, 25, 25, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:41,470 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-07-17 18:07:41,470 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:41,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:41,470 INFO L82 PathProgramCache]: Analyzing trace with hash 1567210389, now seen corresponding path program 24 times [2020-07-17 18:07:41,470 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:41,471 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1163494368] [2020-07-17 18:07:41,471 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:41,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:42,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:42,740 INFO L134 CoverageAnalysis]: Checked inductivity of 2136 backedges. 0 proven. 2125 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:42,740 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1163494368] [2020-07-17 18:07:42,741 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:42,741 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2020-07-17 18:07:42,741 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23512206] [2020-07-17 18:07:42,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-07-17 18:07:42,742 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:42,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-07-17 18:07:42,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=730, Invalid=2132, Unknown=0, NotChecked=0, Total=2862 [2020-07-17 18:07:42,743 INFO L87 Difference]: Start difference. First operand 211 states and 213 transitions. Second operand 54 states. [2020-07-17 18:07:44,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:44,719 INFO L93 Difference]: Finished difference Result 248 states and 252 transitions. [2020-07-17 18:07:44,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2020-07-17 18:07:44,719 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 208 [2020-07-17 18:07:44,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:44,721 INFO L225 Difference]: With dead ends: 248 [2020-07-17 18:07:44,722 INFO L226 Difference]: Without dead ends: 223 [2020-07-17 18:07:44,723 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1874 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3380, Invalid=7332, Unknown=0, NotChecked=0, Total=10712 [2020-07-17 18:07:44,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2020-07-17 18:07:44,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 218. [2020-07-17 18:07:44,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 218 states. [2020-07-17 18:07:44,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 220 transitions. [2020-07-17 18:07:44,731 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 220 transitions. Word has length 208 [2020-07-17 18:07:44,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:44,731 INFO L479 AbstractCegarLoop]: Abstraction has 218 states and 220 transitions. [2020-07-17 18:07:44,731 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-07-17 18:07:44,732 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 220 transitions. [2020-07-17 18:07:44,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2020-07-17 18:07:44,733 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:44,733 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 26, 26, 26, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:44,733 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-07-17 18:07:44,733 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:44,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:44,734 INFO L82 PathProgramCache]: Analyzing trace with hash 1520680036, now seen corresponding path program 25 times [2020-07-17 18:07:44,734 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:44,734 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2132354786] [2020-07-17 18:07:44,734 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:44,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:46,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:46,118 INFO L134 CoverageAnalysis]: Checked inductivity of 2312 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:46,118 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2132354786] [2020-07-17 18:07:46,119 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:46,119 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2020-07-17 18:07:46,119 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190395811] [2020-07-17 18:07:46,119 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-07-17 18:07:46,119 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:46,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-07-17 18:07:46,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=785, Invalid=2295, Unknown=0, NotChecked=0, Total=3080 [2020-07-17 18:07:46,120 INFO L87 Difference]: Start difference. First operand 218 states and 220 transitions. Second operand 56 states. [2020-07-17 18:07:48,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:48,471 INFO L93 Difference]: Finished difference Result 255 states and 259 transitions. [2020-07-17 18:07:48,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2020-07-17 18:07:48,472 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 215 [2020-07-17 18:07:48,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:48,474 INFO L225 Difference]: With dead ends: 255 [2020-07-17 18:07:48,475 INFO L226 Difference]: Without dead ends: 230 [2020-07-17 18:07:48,476 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2027 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3645, Invalid=7911, Unknown=0, NotChecked=0, Total=11556 [2020-07-17 18:07:48,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2020-07-17 18:07:48,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 225. [2020-07-17 18:07:48,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2020-07-17 18:07:48,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 227 transitions. [2020-07-17 18:07:48,483 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 227 transitions. Word has length 215 [2020-07-17 18:07:48,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:48,483 INFO L479 AbstractCegarLoop]: Abstraction has 225 states and 227 transitions. [2020-07-17 18:07:48,483 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-07-17 18:07:48,484 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 227 transitions. [2020-07-17 18:07:48,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2020-07-17 18:07:48,485 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:48,485 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 27, 27, 27, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:48,485 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-07-17 18:07:48,485 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:48,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:48,486 INFO L82 PathProgramCache]: Analyzing trace with hash -415431499, now seen corresponding path program 26 times [2020-07-17 18:07:48,486 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:48,486 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [215743666] [2020-07-17 18:07:48,486 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:48,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:49,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:49,931 INFO L134 CoverageAnalysis]: Checked inductivity of 2495 backedges. 0 proven. 2484 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:49,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [215743666] [2020-07-17 18:07:49,932 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:49,932 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2020-07-17 18:07:49,932 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642839499] [2020-07-17 18:07:49,932 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-07-17 18:07:49,932 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:49,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-07-17 18:07:49,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=842, Invalid=2464, Unknown=0, NotChecked=0, Total=3306 [2020-07-17 18:07:49,933 INFO L87 Difference]: Start difference. First operand 225 states and 227 transitions. Second operand 58 states. [2020-07-17 18:07:52,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:52,443 INFO L93 Difference]: Finished difference Result 262 states and 266 transitions. [2020-07-17 18:07:52,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2020-07-17 18:07:52,448 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 222 [2020-07-17 18:07:52,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:52,449 INFO L225 Difference]: With dead ends: 262 [2020-07-17 18:07:52,450 INFO L226 Difference]: Without dead ends: 237 [2020-07-17 18:07:52,451 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2186 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=3920, Invalid=8512, Unknown=0, NotChecked=0, Total=12432 [2020-07-17 18:07:52,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2020-07-17 18:07:52,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 232. [2020-07-17 18:07:52,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2020-07-17 18:07:52,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 234 transitions. [2020-07-17 18:07:52,457 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 234 transitions. Word has length 222 [2020-07-17 18:07:52,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:52,458 INFO L479 AbstractCegarLoop]: Abstraction has 232 states and 234 transitions. [2020-07-17 18:07:52,458 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-07-17 18:07:52,458 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 234 transitions. [2020-07-17 18:07:52,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2020-07-17 18:07:52,459 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:52,459 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 28, 28, 28, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:52,460 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-07-17 18:07:52,460 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:52,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:52,460 INFO L82 PathProgramCache]: Analyzing trace with hash -547229884, now seen corresponding path program 27 times [2020-07-17 18:07:52,461 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:52,461 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1237090959] [2020-07-17 18:07:52,461 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:52,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:53,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:54,033 INFO L134 CoverageAnalysis]: Checked inductivity of 2685 backedges. 0 proven. 2674 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:54,034 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1237090959] [2020-07-17 18:07:54,034 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:54,034 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2020-07-17 18:07:54,034 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819325326] [2020-07-17 18:07:54,035 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-07-17 18:07:54,035 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:54,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-07-17 18:07:54,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=901, Invalid=2639, Unknown=0, NotChecked=0, Total=3540 [2020-07-17 18:07:54,036 INFO L87 Difference]: Start difference. First operand 232 states and 234 transitions. Second operand 60 states. [2020-07-17 18:07:56,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:07:56,778 INFO L93 Difference]: Finished difference Result 269 states and 273 transitions. [2020-07-17 18:07:56,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2020-07-17 18:07:56,779 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 229 [2020-07-17 18:07:56,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:07:56,781 INFO L225 Difference]: With dead ends: 269 [2020-07-17 18:07:56,781 INFO L226 Difference]: Without dead ends: 244 [2020-07-17 18:07:56,782 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2351 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4205, Invalid=9135, Unknown=0, NotChecked=0, Total=13340 [2020-07-17 18:07:56,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2020-07-17 18:07:56,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 239. [2020-07-17 18:07:56,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239 states. [2020-07-17 18:07:56,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 241 transitions. [2020-07-17 18:07:56,792 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 241 transitions. Word has length 229 [2020-07-17 18:07:56,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:07:56,792 INFO L479 AbstractCegarLoop]: Abstraction has 239 states and 241 transitions. [2020-07-17 18:07:56,793 INFO L480 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-07-17 18:07:56,793 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 241 transitions. [2020-07-17 18:07:56,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2020-07-17 18:07:56,795 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:07:56,795 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 29, 29, 29, 29, 29, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:07:56,795 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-07-17 18:07:56,795 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:07:56,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:07:56,796 INFO L82 PathProgramCache]: Analyzing trace with hash 277468629, now seen corresponding path program 28 times [2020-07-17 18:07:56,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:07:56,796 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [205033473] [2020-07-17 18:07:56,796 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:07:56,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:58,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:07:58,489 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 0 proven. 2871 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:07:58,490 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [205033473] [2020-07-17 18:07:58,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:07:58,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62] total 62 [2020-07-17 18:07:58,490 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762817143] [2020-07-17 18:07:58,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-07-17 18:07:58,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:07:58,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-07-17 18:07:58,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=962, Invalid=2820, Unknown=0, NotChecked=0, Total=3782 [2020-07-17 18:07:58,491 INFO L87 Difference]: Start difference. First operand 239 states and 241 transitions. Second operand 62 states. [2020-07-17 18:08:01,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:08:01,497 INFO L93 Difference]: Finished difference Result 276 states and 280 transitions. [2020-07-17 18:08:01,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2020-07-17 18:08:01,497 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 236 [2020-07-17 18:08:01,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:08:01,499 INFO L225 Difference]: With dead ends: 276 [2020-07-17 18:08:01,499 INFO L226 Difference]: Without dead ends: 251 [2020-07-17 18:08:01,501 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2522 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=4500, Invalid=9780, Unknown=0, NotChecked=0, Total=14280 [2020-07-17 18:08:01,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2020-07-17 18:08:01,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 246. [2020-07-17 18:08:01,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 246 states. [2020-07-17 18:08:01,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 248 transitions. [2020-07-17 18:08:01,508 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 248 transitions. Word has length 236 [2020-07-17 18:08:01,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:08:01,508 INFO L479 AbstractCegarLoop]: Abstraction has 246 states and 248 transitions. [2020-07-17 18:08:01,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-07-17 18:08:01,508 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 248 transitions. [2020-07-17 18:08:01,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2020-07-17 18:08:01,510 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:08:01,510 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 30, 30, 30, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:08:01,510 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-07-17 18:08:01,510 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:08:01,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:08:01,510 INFO L82 PathProgramCache]: Analyzing trace with hash -1168270812, now seen corresponding path program 29 times [2020-07-17 18:08:01,511 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:08:01,511 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1415344280] [2020-07-17 18:08:01,511 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:08:01,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:08:03,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:08:03,288 INFO L134 CoverageAnalysis]: Checked inductivity of 3086 backedges. 0 proven. 3075 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:08:03,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1415344280] [2020-07-17 18:08:03,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:08:03,288 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64] total 64 [2020-07-17 18:08:03,289 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141405702] [2020-07-17 18:08:03,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2020-07-17 18:08:03,289 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:08:03,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2020-07-17 18:08:03,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1025, Invalid=3007, Unknown=0, NotChecked=0, Total=4032 [2020-07-17 18:08:03,290 INFO L87 Difference]: Start difference. First operand 246 states and 248 transitions. Second operand 64 states. [2020-07-17 18:08:06,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:08:06,400 INFO L93 Difference]: Finished difference Result 283 states and 287 transitions. [2020-07-17 18:08:06,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-07-17 18:08:06,403 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 243 [2020-07-17 18:08:06,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:08:06,404 INFO L225 Difference]: With dead ends: 283 [2020-07-17 18:08:06,405 INFO L226 Difference]: Without dead ends: 258 [2020-07-17 18:08:06,406 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2699 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=4805, Invalid=10447, Unknown=0, NotChecked=0, Total=15252 [2020-07-17 18:08:06,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2020-07-17 18:08:06,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 253. [2020-07-17 18:08:06,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 253 states. [2020-07-17 18:08:06,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 255 transitions. [2020-07-17 18:08:06,413 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 255 transitions. Word has length 243 [2020-07-17 18:08:06,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:08:06,413 INFO L479 AbstractCegarLoop]: Abstraction has 253 states and 255 transitions. [2020-07-17 18:08:06,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 64 states. [2020-07-17 18:08:06,414 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 255 transitions. [2020-07-17 18:08:06,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2020-07-17 18:08:06,415 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:08:06,415 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 31, 31, 31, 31, 31, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:08:06,415 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-07-17 18:08:06,416 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:08:06,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:08:06,416 INFO L82 PathProgramCache]: Analyzing trace with hash 1644310261, now seen corresponding path program 30 times [2020-07-17 18:08:06,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:08:06,417 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1643167368] [2020-07-17 18:08:06,417 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:08:06,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:08:08,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:08:08,350 INFO L134 CoverageAnalysis]: Checked inductivity of 3297 backedges. 0 proven. 3286 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:08:08,350 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1643167368] [2020-07-17 18:08:08,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:08:08,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66] total 66 [2020-07-17 18:08:08,350 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36437596] [2020-07-17 18:08:08,351 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2020-07-17 18:08:08,351 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:08:08,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2020-07-17 18:08:08,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1090, Invalid=3200, Unknown=0, NotChecked=0, Total=4290 [2020-07-17 18:08:08,352 INFO L87 Difference]: Start difference. First operand 253 states and 255 transitions. Second operand 66 states. [2020-07-17 18:08:11,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:08:11,539 INFO L93 Difference]: Finished difference Result 290 states and 294 transitions. [2020-07-17 18:08:11,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2020-07-17 18:08:11,540 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 250 [2020-07-17 18:08:11,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:08:11,542 INFO L225 Difference]: With dead ends: 290 [2020-07-17 18:08:11,542 INFO L226 Difference]: Without dead ends: 265 [2020-07-17 18:08:11,543 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2882 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=5120, Invalid=11136, Unknown=0, NotChecked=0, Total=16256 [2020-07-17 18:08:11,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2020-07-17 18:08:11,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 260. [2020-07-17 18:08:11,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2020-07-17 18:08:11,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 262 transitions. [2020-07-17 18:08:11,551 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 262 transitions. Word has length 250 [2020-07-17 18:08:11,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:08:11,551 INFO L479 AbstractCegarLoop]: Abstraction has 260 states and 262 transitions. [2020-07-17 18:08:11,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 66 states. [2020-07-17 18:08:11,551 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 262 transitions. [2020-07-17 18:08:11,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2020-07-17 18:08:11,553 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:08:11,553 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 32, 32, 32, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:08:11,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-07-17 18:08:11,553 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:08:11,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:08:11,554 INFO L82 PathProgramCache]: Analyzing trace with hash -1767588604, now seen corresponding path program 31 times [2020-07-17 18:08:11,554 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:08:11,554 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [55190620] [2020-07-17 18:08:11,554 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:08:11,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:08:13,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:08:13,928 INFO L134 CoverageAnalysis]: Checked inductivity of 3515 backedges. 0 proven. 3504 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:08:13,928 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [55190620] [2020-07-17 18:08:13,928 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:08:13,929 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68] total 68 [2020-07-17 18:08:13,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489107810] [2020-07-17 18:08:13,929 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-17 18:08:13,929 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:08:13,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-17 18:08:13,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1157, Invalid=3399, Unknown=0, NotChecked=0, Total=4556 [2020-07-17 18:08:13,930 INFO L87 Difference]: Start difference. First operand 260 states and 262 transitions. Second operand 68 states. [2020-07-17 18:08:17,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:08:17,454 INFO L93 Difference]: Finished difference Result 297 states and 301 transitions. [2020-07-17 18:08:17,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-17 18:08:17,455 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 257 [2020-07-17 18:08:17,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:08:17,456 INFO L225 Difference]: With dead ends: 297 [2020-07-17 18:08:17,457 INFO L226 Difference]: Without dead ends: 272 [2020-07-17 18:08:17,457 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3071 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=5445, Invalid=11847, Unknown=0, NotChecked=0, Total=17292 [2020-07-17 18:08:17,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2020-07-17 18:08:17,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 267. [2020-07-17 18:08:17,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 267 states. [2020-07-17 18:08:17,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 269 transitions. [2020-07-17 18:08:17,466 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 269 transitions. Word has length 257 [2020-07-17 18:08:17,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:08:17,466 INFO L479 AbstractCegarLoop]: Abstraction has 267 states and 269 transitions. [2020-07-17 18:08:17,466 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-17 18:08:17,466 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 269 transitions. [2020-07-17 18:08:17,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2020-07-17 18:08:17,468 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:08:17,468 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 33, 33, 33, 33, 33, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:08:17,468 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-07-17 18:08:17,468 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:08:17,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:08:17,470 INFO L82 PathProgramCache]: Analyzing trace with hash 1155010581, now seen corresponding path program 32 times [2020-07-17 18:08:17,470 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:08:17,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1920408764] [2020-07-17 18:08:17,470 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:08:17,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:08:19,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:08:19,743 INFO L134 CoverageAnalysis]: Checked inductivity of 3740 backedges. 0 proven. 3729 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:08:19,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1920408764] [2020-07-17 18:08:19,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:08:19,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70] total 70 [2020-07-17 18:08:19,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923348964] [2020-07-17 18:08:19,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2020-07-17 18:08:19,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:08:19,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2020-07-17 18:08:19,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1226, Invalid=3604, Unknown=0, NotChecked=0, Total=4830 [2020-07-17 18:08:19,746 INFO L87 Difference]: Start difference. First operand 267 states and 269 transitions. Second operand 70 states. [2020-07-17 18:08:23,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:08:23,577 INFO L93 Difference]: Finished difference Result 304 states and 308 transitions. [2020-07-17 18:08:23,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2020-07-17 18:08:23,578 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 264 [2020-07-17 18:08:23,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:08:23,580 INFO L225 Difference]: With dead ends: 304 [2020-07-17 18:08:23,580 INFO L226 Difference]: Without dead ends: 279 [2020-07-17 18:08:23,582 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3266 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=5780, Invalid=12580, Unknown=0, NotChecked=0, Total=18360 [2020-07-17 18:08:23,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2020-07-17 18:08:23,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 274. [2020-07-17 18:08:23,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2020-07-17 18:08:23,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 276 transitions. [2020-07-17 18:08:23,589 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 276 transitions. Word has length 264 [2020-07-17 18:08:23,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:08:23,590 INFO L479 AbstractCegarLoop]: Abstraction has 274 states and 276 transitions. [2020-07-17 18:08:23,590 INFO L480 AbstractCegarLoop]: Interpolant automaton has 70 states. [2020-07-17 18:08:23,590 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 276 transitions. [2020-07-17 18:08:23,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2020-07-17 18:08:23,592 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:08:23,592 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 34, 34, 34, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:08:23,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-07-17 18:08:23,592 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:08:23,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:08:23,593 INFO L82 PathProgramCache]: Analyzing trace with hash -1362798620, now seen corresponding path program 33 times [2020-07-17 18:08:23,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:08:23,593 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1284599422] [2020-07-17 18:08:23,593 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:08:23,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:08:25,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:08:26,041 INFO L134 CoverageAnalysis]: Checked inductivity of 3972 backedges. 0 proven. 3961 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:08:26,042 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1284599422] [2020-07-17 18:08:26,042 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:08:26,042 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72] total 72 [2020-07-17 18:08:26,042 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365571391] [2020-07-17 18:08:26,042 INFO L459 AbstractCegarLoop]: Interpolant automaton has 72 states [2020-07-17 18:08:26,043 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:08:26,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2020-07-17 18:08:26,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1297, Invalid=3815, Unknown=0, NotChecked=0, Total=5112 [2020-07-17 18:08:26,044 INFO L87 Difference]: Start difference. First operand 274 states and 276 transitions. Second operand 72 states. [2020-07-17 18:08:30,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:08:30,104 INFO L93 Difference]: Finished difference Result 311 states and 315 transitions. [2020-07-17 18:08:30,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2020-07-17 18:08:30,105 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 271 [2020-07-17 18:08:30,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:08:30,107 INFO L225 Difference]: With dead ends: 311 [2020-07-17 18:08:30,107 INFO L226 Difference]: Without dead ends: 286 [2020-07-17 18:08:30,108 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3467 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=6125, Invalid=13335, Unknown=0, NotChecked=0, Total=19460 [2020-07-17 18:08:30,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2020-07-17 18:08:30,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 281. [2020-07-17 18:08:30,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 281 states. [2020-07-17 18:08:30,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 283 transitions. [2020-07-17 18:08:30,120 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 283 transitions. Word has length 271 [2020-07-17 18:08:30,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:08:30,120 INFO L479 AbstractCegarLoop]: Abstraction has 281 states and 283 transitions. [2020-07-17 18:08:30,120 INFO L480 AbstractCegarLoop]: Interpolant automaton has 72 states. [2020-07-17 18:08:30,120 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 283 transitions. [2020-07-17 18:08:30,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 279 [2020-07-17 18:08:30,122 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:08:30,122 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 35, 35, 35, 35, 35, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:08:30,122 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-07-17 18:08:30,122 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:08:30,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:08:30,123 INFO L82 PathProgramCache]: Analyzing trace with hash 582842677, now seen corresponding path program 34 times [2020-07-17 18:08:30,123 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:08:30,123 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [566178419] [2020-07-17 18:08:30,123 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:08:30,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:08:32,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:08:32,648 INFO L134 CoverageAnalysis]: Checked inductivity of 4211 backedges. 0 proven. 4200 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:08:32,648 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [566178419] [2020-07-17 18:08:32,648 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:08:32,648 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74] total 74 [2020-07-17 18:08:32,648 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634195612] [2020-07-17 18:08:32,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2020-07-17 18:08:32,649 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:08:32,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2020-07-17 18:08:32,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1370, Invalid=4032, Unknown=0, NotChecked=0, Total=5402 [2020-07-17 18:08:32,650 INFO L87 Difference]: Start difference. First operand 281 states and 283 transitions. Second operand 74 states. [2020-07-17 18:08:36,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:08:36,912 INFO L93 Difference]: Finished difference Result 318 states and 322 transitions. [2020-07-17 18:08:36,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2020-07-17 18:08:36,913 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 278 [2020-07-17 18:08:36,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:08:36,915 INFO L225 Difference]: With dead ends: 318 [2020-07-17 18:08:36,915 INFO L226 Difference]: Without dead ends: 293 [2020-07-17 18:08:36,916 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3674 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=6480, Invalid=14112, Unknown=0, NotChecked=0, Total=20592 [2020-07-17 18:08:36,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2020-07-17 18:08:36,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 288. [2020-07-17 18:08:36,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-17 18:08:36,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 290 transitions. [2020-07-17 18:08:36,923 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 290 transitions. Word has length 278 [2020-07-17 18:08:36,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:08:36,923 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 290 transitions. [2020-07-17 18:08:36,923 INFO L480 AbstractCegarLoop]: Interpolant automaton has 74 states. [2020-07-17 18:08:36,923 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 290 transitions. [2020-07-17 18:08:36,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2020-07-17 18:08:36,924 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:08:36,924 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 36, 36, 36, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:08:36,924 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-07-17 18:08:36,925 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:08:36,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:08:36,925 INFO L82 PathProgramCache]: Analyzing trace with hash -1395823932, now seen corresponding path program 35 times [2020-07-17 18:08:36,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:08:36,925 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [879363283] [2020-07-17 18:08:36,925 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:08:36,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:08:39,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:08:39,853 INFO L134 CoverageAnalysis]: Checked inductivity of 4457 backedges. 0 proven. 4446 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:08:39,854 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [879363283] [2020-07-17 18:08:39,854 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:08:39,854 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76] total 76 [2020-07-17 18:08:39,854 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059010521] [2020-07-17 18:08:39,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 76 states [2020-07-17 18:08:39,855 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:08:39,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2020-07-17 18:08:39,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1445, Invalid=4255, Unknown=0, NotChecked=0, Total=5700 [2020-07-17 18:08:39,856 INFO L87 Difference]: Start difference. First operand 288 states and 290 transitions. Second operand 76 states. [2020-07-17 18:08:44,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:08:44,422 INFO L93 Difference]: Finished difference Result 325 states and 329 transitions. [2020-07-17 18:08:44,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2020-07-17 18:08:44,423 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 285 [2020-07-17 18:08:44,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:08:44,425 INFO L225 Difference]: With dead ends: 325 [2020-07-17 18:08:44,425 INFO L226 Difference]: Without dead ends: 300 [2020-07-17 18:08:44,426 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3887 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=6845, Invalid=14911, Unknown=0, NotChecked=0, Total=21756 [2020-07-17 18:08:44,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2020-07-17 18:08:44,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 295. [2020-07-17 18:08:44,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 295 states. [2020-07-17 18:08:44,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 297 transitions. [2020-07-17 18:08:44,434 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 297 transitions. Word has length 285 [2020-07-17 18:08:44,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:08:44,434 INFO L479 AbstractCegarLoop]: Abstraction has 295 states and 297 transitions. [2020-07-17 18:08:44,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 76 states. [2020-07-17 18:08:44,435 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 297 transitions. [2020-07-17 18:08:44,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2020-07-17 18:08:44,436 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:08:44,436 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 37, 37, 37, 37, 37, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:08:44,437 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-07-17 18:08:44,437 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:08:44,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:08:44,437 INFO L82 PathProgramCache]: Analyzing trace with hash -2048628139, now seen corresponding path program 36 times [2020-07-17 18:08:44,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:08:44,438 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [203675746] [2020-07-17 18:08:44,438 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:08:44,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:08:47,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:08:47,309 INFO L134 CoverageAnalysis]: Checked inductivity of 4710 backedges. 0 proven. 4699 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:08:47,309 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [203675746] [2020-07-17 18:08:47,309 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:08:47,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78] total 78 [2020-07-17 18:08:47,310 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687924908] [2020-07-17 18:08:47,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 78 states [2020-07-17 18:08:47,310 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:08:47,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2020-07-17 18:08:47,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1522, Invalid=4484, Unknown=0, NotChecked=0, Total=6006 [2020-07-17 18:08:47,311 INFO L87 Difference]: Start difference. First operand 295 states and 297 transitions. Second operand 78 states. [2020-07-17 18:08:51,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:08:51,820 INFO L93 Difference]: Finished difference Result 332 states and 336 transitions. [2020-07-17 18:08:51,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2020-07-17 18:08:51,821 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 292 [2020-07-17 18:08:51,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:08:51,823 INFO L225 Difference]: With dead ends: 332 [2020-07-17 18:08:51,824 INFO L226 Difference]: Without dead ends: 307 [2020-07-17 18:08:51,825 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4106 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=7220, Invalid=15732, Unknown=0, NotChecked=0, Total=22952 [2020-07-17 18:08:51,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2020-07-17 18:08:51,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 302. [2020-07-17 18:08:51,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 302 states. [2020-07-17 18:08:51,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 304 transitions. [2020-07-17 18:08:51,833 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 304 transitions. Word has length 292 [2020-07-17 18:08:51,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:08:51,833 INFO L479 AbstractCegarLoop]: Abstraction has 302 states and 304 transitions. [2020-07-17 18:08:51,833 INFO L480 AbstractCegarLoop]: Interpolant automaton has 78 states. [2020-07-17 18:08:51,833 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 304 transitions. [2020-07-17 18:08:51,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-17 18:08:51,835 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:08:51,835 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 38, 38, 38, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:08:51,835 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-07-17 18:08:51,835 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:08:51,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:08:51,836 INFO L82 PathProgramCache]: Analyzing trace with hash -1974798940, now seen corresponding path program 37 times [2020-07-17 18:08:51,836 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:08:51,836 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1762016236] [2020-07-17 18:08:51,836 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:08:51,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:08:54,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:08:54,909 INFO L134 CoverageAnalysis]: Checked inductivity of 4970 backedges. 0 proven. 4959 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:08:54,909 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1762016236] [2020-07-17 18:08:54,909 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:08:54,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80] total 80 [2020-07-17 18:08:54,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271480861] [2020-07-17 18:08:54,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2020-07-17 18:08:54,910 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:08:54,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2020-07-17 18:08:54,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1601, Invalid=4719, Unknown=0, NotChecked=0, Total=6320 [2020-07-17 18:08:54,911 INFO L87 Difference]: Start difference. First operand 302 states and 304 transitions. Second operand 80 states. [2020-07-17 18:09:00,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:09:00,171 INFO L93 Difference]: Finished difference Result 339 states and 343 transitions. [2020-07-17 18:09:00,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2020-07-17 18:09:00,172 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 299 [2020-07-17 18:09:00,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:09:00,175 INFO L225 Difference]: With dead ends: 339 [2020-07-17 18:09:00,175 INFO L226 Difference]: Without dead ends: 314 [2020-07-17 18:09:00,176 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4331 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=7605, Invalid=16575, Unknown=0, NotChecked=0, Total=24180 [2020-07-17 18:09:00,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2020-07-17 18:09:00,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 309. [2020-07-17 18:09:00,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 309 states. [2020-07-17 18:09:00,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 311 transitions. [2020-07-17 18:09:00,184 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 311 transitions. Word has length 299 [2020-07-17 18:09:00,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:09:00,184 INFO L479 AbstractCegarLoop]: Abstraction has 309 states and 311 transitions. [2020-07-17 18:09:00,184 INFO L480 AbstractCegarLoop]: Interpolant automaton has 80 states. [2020-07-17 18:09:00,184 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 311 transitions. [2020-07-17 18:09:00,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2020-07-17 18:09:00,186 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:09:00,186 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 39, 39, 39, 39, 39, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:09:00,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-07-17 18:09:00,187 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:09:00,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:09:00,187 INFO L82 PathProgramCache]: Analyzing trace with hash 956228469, now seen corresponding path program 38 times [2020-07-17 18:09:00,187 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:09:00,188 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1796102600] [2020-07-17 18:09:00,188 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:09:00,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:03,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:03,455 INFO L134 CoverageAnalysis]: Checked inductivity of 5237 backedges. 0 proven. 5226 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:09:03,456 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1796102600] [2020-07-17 18:09:03,457 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:09:03,457 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [82] total 82 [2020-07-17 18:09:03,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [942182329] [2020-07-17 18:09:03,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 82 states [2020-07-17 18:09:03,459 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:09:03,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2020-07-17 18:09:03,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1682, Invalid=4960, Unknown=0, NotChecked=0, Total=6642 [2020-07-17 18:09:03,460 INFO L87 Difference]: Start difference. First operand 309 states and 311 transitions. Second operand 82 states. [2020-07-17 18:09:09,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:09:09,016 INFO L93 Difference]: Finished difference Result 346 states and 350 transitions. [2020-07-17 18:09:09,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2020-07-17 18:09:09,017 INFO L78 Accepts]: Start accepts. Automaton has 82 states. Word has length 306 [2020-07-17 18:09:09,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:09:09,019 INFO L225 Difference]: With dead ends: 346 [2020-07-17 18:09:09,019 INFO L226 Difference]: Without dead ends: 321 [2020-07-17 18:09:09,020 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4562 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=8000, Invalid=17440, Unknown=0, NotChecked=0, Total=25440 [2020-07-17 18:09:09,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2020-07-17 18:09:09,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 316. [2020-07-17 18:09:09,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2020-07-17 18:09:09,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 318 transitions. [2020-07-17 18:09:09,027 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 318 transitions. Word has length 306 [2020-07-17 18:09:09,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:09:09,027 INFO L479 AbstractCegarLoop]: Abstraction has 316 states and 318 transitions. [2020-07-17 18:09:09,028 INFO L480 AbstractCegarLoop]: Interpolant automaton has 82 states. [2020-07-17 18:09:09,028 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 318 transitions. [2020-07-17 18:09:09,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 314 [2020-07-17 18:09:09,030 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:09:09,030 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 40, 40, 40, 40, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:09:09,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-07-17 18:09:09,030 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:09:09,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:09:09,031 INFO L82 PathProgramCache]: Analyzing trace with hash 1884027012, now seen corresponding path program 39 times [2020-07-17 18:09:09,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:09:09,031 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1518460812] [2020-07-17 18:09:09,031 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:09:09,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:12,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:12,649 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 0 proven. 5500 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:09:12,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1518460812] [2020-07-17 18:09:12,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:09:12,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84] total 84 [2020-07-17 18:09:12,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122129192] [2020-07-17 18:09:12,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 84 states [2020-07-17 18:09:12,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:09:12,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2020-07-17 18:09:12,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1765, Invalid=5207, Unknown=0, NotChecked=0, Total=6972 [2020-07-17 18:09:12,652 INFO L87 Difference]: Start difference. First operand 316 states and 318 transitions. Second operand 84 states. [2020-07-17 18:09:18,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:09:18,207 INFO L93 Difference]: Finished difference Result 353 states and 357 transitions. [2020-07-17 18:09:18,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2020-07-17 18:09:18,208 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 313 [2020-07-17 18:09:18,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:09:18,210 INFO L225 Difference]: With dead ends: 353 [2020-07-17 18:09:18,210 INFO L226 Difference]: Without dead ends: 328 [2020-07-17 18:09:18,211 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4799 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=8405, Invalid=18327, Unknown=0, NotChecked=0, Total=26732 [2020-07-17 18:09:18,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2020-07-17 18:09:18,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 323. [2020-07-17 18:09:18,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 323 states. [2020-07-17 18:09:18,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 325 transitions. [2020-07-17 18:09:18,221 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 325 transitions. Word has length 313 [2020-07-17 18:09:18,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:09:18,222 INFO L479 AbstractCegarLoop]: Abstraction has 323 states and 325 transitions. [2020-07-17 18:09:18,222 INFO L480 AbstractCegarLoop]: Interpolant automaton has 84 states. [2020-07-17 18:09:18,222 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 325 transitions. [2020-07-17 18:09:18,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2020-07-17 18:09:18,224 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:09:18,224 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 41, 41, 41, 41, 41, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:09:18,224 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-07-17 18:09:18,224 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:09:18,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:09:18,225 INFO L82 PathProgramCache]: Analyzing trace with hash 1732174997, now seen corresponding path program 40 times [2020-07-17 18:09:18,225 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:09:18,225 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1924426725] [2020-07-17 18:09:18,225 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:09:18,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:22,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:22,077 INFO L134 CoverageAnalysis]: Checked inductivity of 5792 backedges. 0 proven. 5781 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:09:22,077 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1924426725] [2020-07-17 18:09:22,077 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:09:22,077 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [86] total 86 [2020-07-17 18:09:22,078 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621912748] [2020-07-17 18:09:22,078 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2020-07-17 18:09:22,078 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:09:22,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2020-07-17 18:09:22,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1850, Invalid=5460, Unknown=0, NotChecked=0, Total=7310 [2020-07-17 18:09:22,079 INFO L87 Difference]: Start difference. First operand 323 states and 325 transitions. Second operand 86 states. [2020-07-17 18:09:28,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:09:28,539 INFO L93 Difference]: Finished difference Result 360 states and 364 transitions. [2020-07-17 18:09:28,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2020-07-17 18:09:28,540 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 320 [2020-07-17 18:09:28,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:09:28,542 INFO L225 Difference]: With dead ends: 360 [2020-07-17 18:09:28,542 INFO L226 Difference]: Without dead ends: 335 [2020-07-17 18:09:28,543 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5042 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=8820, Invalid=19236, Unknown=0, NotChecked=0, Total=28056 [2020-07-17 18:09:28,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2020-07-17 18:09:28,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 330. [2020-07-17 18:09:28,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 330 states. [2020-07-17 18:09:28,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 332 transitions. [2020-07-17 18:09:28,551 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 332 transitions. Word has length 320 [2020-07-17 18:09:28,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:09:28,551 INFO L479 AbstractCegarLoop]: Abstraction has 330 states and 332 transitions. [2020-07-17 18:09:28,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 86 states. [2020-07-17 18:09:28,551 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 332 transitions. [2020-07-17 18:09:28,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2020-07-17 18:09:28,553 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:09:28,554 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 42, 42, 42, 42, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:09:28,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-07-17 18:09:28,554 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:09:28,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:09:28,554 INFO L82 PathProgramCache]: Analyzing trace with hash -1755417756, now seen corresponding path program 41 times [2020-07-17 18:09:28,555 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:09:28,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1181437424] [2020-07-17 18:09:28,555 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:09:28,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:32,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:32,713 INFO L134 CoverageAnalysis]: Checked inductivity of 6080 backedges. 0 proven. 6069 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:09:32,714 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1181437424] [2020-07-17 18:09:32,714 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:09:32,714 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88] total 88 [2020-07-17 18:09:32,714 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924206044] [2020-07-17 18:09:32,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 88 states [2020-07-17 18:09:32,715 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:09:32,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2020-07-17 18:09:32,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1937, Invalid=5719, Unknown=0, NotChecked=0, Total=7656 [2020-07-17 18:09:32,716 INFO L87 Difference]: Start difference. First operand 330 states and 332 transitions. Second operand 88 states. [2020-07-17 18:09:39,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:09:39,450 INFO L93 Difference]: Finished difference Result 367 states and 371 transitions. [2020-07-17 18:09:39,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2020-07-17 18:09:39,451 INFO L78 Accepts]: Start accepts. Automaton has 88 states. Word has length 327 [2020-07-17 18:09:39,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:09:39,452 INFO L225 Difference]: With dead ends: 367 [2020-07-17 18:09:39,453 INFO L226 Difference]: Without dead ends: 342 [2020-07-17 18:09:39,454 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5291 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=9245, Invalid=20167, Unknown=0, NotChecked=0, Total=29412 [2020-07-17 18:09:39,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2020-07-17 18:09:39,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 337. [2020-07-17 18:09:39,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 337 states. [2020-07-17 18:09:39,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 339 transitions. [2020-07-17 18:09:39,463 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 339 transitions. Word has length 327 [2020-07-17 18:09:39,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:09:39,463 INFO L479 AbstractCegarLoop]: Abstraction has 337 states and 339 transitions. [2020-07-17 18:09:39,463 INFO L480 AbstractCegarLoop]: Interpolant automaton has 88 states. [2020-07-17 18:09:39,464 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 339 transitions. [2020-07-17 18:09:39,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2020-07-17 18:09:39,465 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:09:39,466 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 43, 43, 43, 43, 43, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:09:39,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-07-17 18:09:39,466 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:09:39,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:09:39,466 INFO L82 PathProgramCache]: Analyzing trace with hash -1135186507, now seen corresponding path program 42 times [2020-07-17 18:09:39,467 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:09:39,467 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [113543714] [2020-07-17 18:09:39,467 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:09:39,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:43,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:44,032 INFO L134 CoverageAnalysis]: Checked inductivity of 6375 backedges. 0 proven. 6364 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:09:44,033 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [113543714] [2020-07-17 18:09:44,033 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:09:44,033 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90] total 90 [2020-07-17 18:09:44,033 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273712427] [2020-07-17 18:09:44,034 INFO L459 AbstractCegarLoop]: Interpolant automaton has 90 states [2020-07-17 18:09:44,034 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:09:44,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2020-07-17 18:09:44,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2026, Invalid=5984, Unknown=0, NotChecked=0, Total=8010 [2020-07-17 18:09:44,035 INFO L87 Difference]: Start difference. First operand 337 states and 339 transitions. Second operand 90 states. [2020-07-17 18:09:51,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:09:51,477 INFO L93 Difference]: Finished difference Result 374 states and 378 transitions. [2020-07-17 18:09:51,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2020-07-17 18:09:51,478 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 334 [2020-07-17 18:09:51,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:09:51,481 INFO L225 Difference]: With dead ends: 374 [2020-07-17 18:09:51,481 INFO L226 Difference]: Without dead ends: 349 [2020-07-17 18:09:51,482 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5546 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=9680, Invalid=21120, Unknown=0, NotChecked=0, Total=30800 [2020-07-17 18:09:51,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2020-07-17 18:09:51,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 344. [2020-07-17 18:09:51,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 344 states. [2020-07-17 18:09:51,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 346 transitions. [2020-07-17 18:09:51,490 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 346 transitions. Word has length 334 [2020-07-17 18:09:51,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:09:51,490 INFO L479 AbstractCegarLoop]: Abstraction has 344 states and 346 transitions. [2020-07-17 18:09:51,491 INFO L480 AbstractCegarLoop]: Interpolant automaton has 90 states. [2020-07-17 18:09:51,491 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 346 transitions. [2020-07-17 18:09:51,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 342 [2020-07-17 18:09:51,493 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:09:51,493 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 44, 44, 44, 44, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:09:51,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-07-17 18:09:51,494 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:09:51,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:09:51,494 INFO L82 PathProgramCache]: Analyzing trace with hash 663774788, now seen corresponding path program 43 times [2020-07-17 18:09:51,494 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:09:51,495 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [53349437] [2020-07-17 18:09:51,495 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:09:51,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:56,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:09:56,558 INFO L134 CoverageAnalysis]: Checked inductivity of 6677 backedges. 0 proven. 6666 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:09:56,558 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [53349437] [2020-07-17 18:09:56,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:09:56,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [92] total 92 [2020-07-17 18:09:56,558 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429607032] [2020-07-17 18:09:56,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2020-07-17 18:09:56,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:09:56,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2020-07-17 18:09:56,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2117, Invalid=6255, Unknown=0, NotChecked=0, Total=8372 [2020-07-17 18:09:56,560 INFO L87 Difference]: Start difference. First operand 344 states and 346 transitions. Second operand 92 states. [2020-07-17 18:10:05,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:10:05,072 INFO L93 Difference]: Finished difference Result 381 states and 385 transitions. [2020-07-17 18:10:05,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2020-07-17 18:10:05,073 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 341 [2020-07-17 18:10:05,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:10:05,075 INFO L225 Difference]: With dead ends: 381 [2020-07-17 18:10:05,075 INFO L226 Difference]: Without dead ends: 356 [2020-07-17 18:10:05,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5807 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=10125, Invalid=22095, Unknown=0, NotChecked=0, Total=32220 [2020-07-17 18:10:05,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2020-07-17 18:10:05,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 351. [2020-07-17 18:10:05,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 351 states. [2020-07-17 18:10:05,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 353 transitions. [2020-07-17 18:10:05,086 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 353 transitions. Word has length 341 [2020-07-17 18:10:05,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:10:05,087 INFO L479 AbstractCegarLoop]: Abstraction has 351 states and 353 transitions. [2020-07-17 18:10:05,087 INFO L480 AbstractCegarLoop]: Interpolant automaton has 92 states. [2020-07-17 18:10:05,087 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 353 transitions. [2020-07-17 18:10:05,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 349 [2020-07-17 18:10:05,089 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:10:05,089 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 45, 45, 45, 45, 45, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:10:05,089 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-07-17 18:10:05,090 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:10:05,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:10:05,090 INFO L82 PathProgramCache]: Analyzing trace with hash -2072543531, now seen corresponding path program 44 times [2020-07-17 18:10:05,090 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:10:05,090 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1610932630] [2020-07-17 18:10:05,090 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:10:05,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:10:10,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:10:10,678 INFO L134 CoverageAnalysis]: Checked inductivity of 6986 backedges. 0 proven. 6975 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:10:10,678 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1610932630] [2020-07-17 18:10:10,679 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:10:10,679 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [94] total 94 [2020-07-17 18:10:10,679 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592066542] [2020-07-17 18:10:10,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 94 states [2020-07-17 18:10:10,679 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:10:10,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2020-07-17 18:10:10,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2210, Invalid=6532, Unknown=0, NotChecked=0, Total=8742 [2020-07-17 18:10:10,680 INFO L87 Difference]: Start difference. First operand 351 states and 353 transitions. Second operand 94 states. [2020-07-17 18:10:19,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:10:19,508 INFO L93 Difference]: Finished difference Result 388 states and 392 transitions. [2020-07-17 18:10:19,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2020-07-17 18:10:19,509 INFO L78 Accepts]: Start accepts. Automaton has 94 states. Word has length 348 [2020-07-17 18:10:19,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:10:19,511 INFO L225 Difference]: With dead ends: 388 [2020-07-17 18:10:19,512 INFO L226 Difference]: Without dead ends: 363 [2020-07-17 18:10:19,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6074 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=10580, Invalid=23092, Unknown=0, NotChecked=0, Total=33672 [2020-07-17 18:10:19,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 363 states. [2020-07-17 18:10:19,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 363 to 358. [2020-07-17 18:10:19,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 358 states. [2020-07-17 18:10:19,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 358 states to 358 states and 360 transitions. [2020-07-17 18:10:19,520 INFO L78 Accepts]: Start accepts. Automaton has 358 states and 360 transitions. Word has length 348 [2020-07-17 18:10:19,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:10:19,521 INFO L479 AbstractCegarLoop]: Abstraction has 358 states and 360 transitions. [2020-07-17 18:10:19,521 INFO L480 AbstractCegarLoop]: Interpolant automaton has 94 states. [2020-07-17 18:10:19,521 INFO L276 IsEmpty]: Start isEmpty. Operand 358 states and 360 transitions. [2020-07-17 18:10:19,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 356 [2020-07-17 18:10:19,522 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:10:19,523 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 46, 46, 46, 46, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:10:19,523 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-07-17 18:10:19,523 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:10:19,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:10:19,523 INFO L82 PathProgramCache]: Analyzing trace with hash 409981220, now seen corresponding path program 45 times [2020-07-17 18:10:19,523 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:10:19,524 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2022533723] [2020-07-17 18:10:19,524 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:10:19,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:10:25,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:10:25,737 INFO L134 CoverageAnalysis]: Checked inductivity of 7302 backedges. 0 proven. 7291 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:10:25,737 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2022533723] [2020-07-17 18:10:25,737 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:10:25,738 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96] total 96 [2020-07-17 18:10:25,738 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [531787601] [2020-07-17 18:10:25,738 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-17 18:10:25,738 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:10:25,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-17 18:10:25,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2305, Invalid=6815, Unknown=0, NotChecked=0, Total=9120 [2020-07-17 18:10:25,739 INFO L87 Difference]: Start difference. First operand 358 states and 360 transitions. Second operand 96 states. [2020-07-17 18:10:35,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:10:35,601 INFO L93 Difference]: Finished difference Result 395 states and 399 transitions. [2020-07-17 18:10:35,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2020-07-17 18:10:35,602 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 355 [2020-07-17 18:10:35,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:10:35,605 INFO L225 Difference]: With dead ends: 395 [2020-07-17 18:10:35,605 INFO L226 Difference]: Without dead ends: 370 [2020-07-17 18:10:35,606 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6347 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=11045, Invalid=24111, Unknown=0, NotChecked=0, Total=35156 [2020-07-17 18:10:35,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2020-07-17 18:10:35,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 365. [2020-07-17 18:10:35,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 365 states. [2020-07-17 18:10:35,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 365 states to 365 states and 367 transitions. [2020-07-17 18:10:35,615 INFO L78 Accepts]: Start accepts. Automaton has 365 states and 367 transitions. Word has length 355 [2020-07-17 18:10:35,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:10:35,615 INFO L479 AbstractCegarLoop]: Abstraction has 365 states and 367 transitions. [2020-07-17 18:10:35,615 INFO L480 AbstractCegarLoop]: Interpolant automaton has 96 states. [2020-07-17 18:10:35,615 INFO L276 IsEmpty]: Start isEmpty. Operand 365 states and 367 transitions. [2020-07-17 18:10:35,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 363 [2020-07-17 18:10:35,618 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:10:35,618 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 47, 47, 47, 47, 47, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:10:35,618 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-07-17 18:10:35,620 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:10:35,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:10:35,620 INFO L82 PathProgramCache]: Analyzing trace with hash -866904075, now seen corresponding path program 46 times [2020-07-17 18:10:35,621 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:10:35,621 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1029786228] [2020-07-17 18:10:35,621 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:10:35,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:10:42,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:10:42,576 INFO L134 CoverageAnalysis]: Checked inductivity of 7625 backedges. 0 proven. 7614 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:10:42,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1029786228] [2020-07-17 18:10:42,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:10:42,577 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98] total 98 [2020-07-17 18:10:42,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440568673] [2020-07-17 18:10:42,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2020-07-17 18:10:42,577 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:10:42,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2020-07-17 18:10:42,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2402, Invalid=7104, Unknown=0, NotChecked=0, Total=9506 [2020-07-17 18:10:42,578 INFO L87 Difference]: Start difference. First operand 365 states and 367 transitions. Second operand 98 states. [2020-07-17 18:10:53,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:10:53,545 INFO L93 Difference]: Finished difference Result 402 states and 406 transitions. [2020-07-17 18:10:53,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 145 states. [2020-07-17 18:10:53,547 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 362 [2020-07-17 18:10:53,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:10:53,550 INFO L225 Difference]: With dead ends: 402 [2020-07-17 18:10:53,550 INFO L226 Difference]: Without dead ends: 377 [2020-07-17 18:10:53,551 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6626 ImplicationChecksByTransitivity, 16.6s TimeCoverageRelationStatistics Valid=11520, Invalid=25152, Unknown=0, NotChecked=0, Total=36672 [2020-07-17 18:10:53,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2020-07-17 18:10:53,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 372. [2020-07-17 18:10:53,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 372 states. [2020-07-17 18:10:53,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 374 transitions. [2020-07-17 18:10:53,560 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 374 transitions. Word has length 362 [2020-07-17 18:10:53,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:10:53,560 INFO L479 AbstractCegarLoop]: Abstraction has 372 states and 374 transitions. [2020-07-17 18:10:53,560 INFO L480 AbstractCegarLoop]: Interpolant automaton has 98 states. [2020-07-17 18:10:53,562 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 374 transitions. [2020-07-17 18:10:53,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 370 [2020-07-17 18:10:53,564 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:10:53,564 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 48, 48, 48, 48, 48, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:10:53,565 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-07-17 18:10:53,565 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:10:53,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:10:53,565 INFO L82 PathProgramCache]: Analyzing trace with hash 285914116, now seen corresponding path program 47 times [2020-07-17 18:10:53,568 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:10:53,568 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1631835799] [2020-07-17 18:10:53,569 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:10:53,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:11:01,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:11:01,355 INFO L134 CoverageAnalysis]: Checked inductivity of 7955 backedges. 0 proven. 7944 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:11:01,355 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1631835799] [2020-07-17 18:11:01,355 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:11:01,356 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100] total 100 [2020-07-17 18:11:01,356 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226708422] [2020-07-17 18:11:01,356 INFO L459 AbstractCegarLoop]: Interpolant automaton has 100 states [2020-07-17 18:11:01,356 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:11:01,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2020-07-17 18:11:01,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2501, Invalid=7399, Unknown=0, NotChecked=0, Total=9900 [2020-07-17 18:11:01,357 INFO L87 Difference]: Start difference. First operand 372 states and 374 transitions. Second operand 100 states. [2020-07-17 18:11:14,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:11:14,225 INFO L93 Difference]: Finished difference Result 409 states and 413 transitions. [2020-07-17 18:11:14,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 148 states. [2020-07-17 18:11:14,227 INFO L78 Accepts]: Start accepts. Automaton has 100 states. Word has length 369 [2020-07-17 18:11:14,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:11:14,230 INFO L225 Difference]: With dead ends: 409 [2020-07-17 18:11:14,230 INFO L226 Difference]: Without dead ends: 384 [2020-07-17 18:11:14,232 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6911 ImplicationChecksByTransitivity, 18.8s TimeCoverageRelationStatistics Valid=12005, Invalid=26215, Unknown=0, NotChecked=0, Total=38220 [2020-07-17 18:11:14,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 384 states. [2020-07-17 18:11:14,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 384 to 379. [2020-07-17 18:11:14,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 379 states. [2020-07-17 18:11:14,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 381 transitions. [2020-07-17 18:11:14,239 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 381 transitions. Word has length 369 [2020-07-17 18:11:14,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:11:14,239 INFO L479 AbstractCegarLoop]: Abstraction has 379 states and 381 transitions. [2020-07-17 18:11:14,239 INFO L480 AbstractCegarLoop]: Interpolant automaton has 100 states. [2020-07-17 18:11:14,240 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 381 transitions. [2020-07-17 18:11:14,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 377 [2020-07-17 18:11:14,241 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:11:14,242 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 49, 49, 49, 49, 49, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:11:14,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-07-17 18:11:14,242 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:11:14,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:11:14,242 INFO L82 PathProgramCache]: Analyzing trace with hash -2128725739, now seen corresponding path program 48 times [2020-07-17 18:11:14,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:11:14,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [200202237] [2020-07-17 18:11:14,242 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:11:14,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:11:22,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:11:22,954 INFO L134 CoverageAnalysis]: Checked inductivity of 8292 backedges. 0 proven. 8281 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:11:22,954 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [200202237] [2020-07-17 18:11:22,954 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:11:22,955 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102] total 102 [2020-07-17 18:11:22,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782745797] [2020-07-17 18:11:22,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 102 states [2020-07-17 18:11:22,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:11:22,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2020-07-17 18:11:22,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2602, Invalid=7700, Unknown=0, NotChecked=0, Total=10302 [2020-07-17 18:11:22,956 INFO L87 Difference]: Start difference. First operand 379 states and 381 transitions. Second operand 102 states. [2020-07-17 18:11:36,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:11:36,824 INFO L93 Difference]: Finished difference Result 416 states and 420 transitions. [2020-07-17 18:11:36,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2020-07-17 18:11:36,826 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 376 [2020-07-17 18:11:36,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:11:36,829 INFO L225 Difference]: With dead ends: 416 [2020-07-17 18:11:36,829 INFO L226 Difference]: Without dead ends: 391 [2020-07-17 18:11:36,830 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7202 ImplicationChecksByTransitivity, 21.1s TimeCoverageRelationStatistics Valid=12500, Invalid=27300, Unknown=0, NotChecked=0, Total=39800 [2020-07-17 18:11:36,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 391 states. [2020-07-17 18:11:36,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 386. [2020-07-17 18:11:36,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 386 states. [2020-07-17 18:11:36,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 386 states to 386 states and 388 transitions. [2020-07-17 18:11:36,838 INFO L78 Accepts]: Start accepts. Automaton has 386 states and 388 transitions. Word has length 376 [2020-07-17 18:11:36,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:11:36,838 INFO L479 AbstractCegarLoop]: Abstraction has 386 states and 388 transitions. [2020-07-17 18:11:36,838 INFO L480 AbstractCegarLoop]: Interpolant automaton has 102 states. [2020-07-17 18:11:36,838 INFO L276 IsEmpty]: Start isEmpty. Operand 386 states and 388 transitions. [2020-07-17 18:11:36,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 384 [2020-07-17 18:11:36,842 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:11:36,842 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 50, 50, 50, 50, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:11:36,842 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-07-17 18:11:36,843 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:11:36,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:11:36,843 INFO L82 PathProgramCache]: Analyzing trace with hash 1206849252, now seen corresponding path program 49 times [2020-07-17 18:11:36,843 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:11:36,844 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2138558971] [2020-07-17 18:11:36,844 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:11:36,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:11:46,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:11:46,720 INFO L134 CoverageAnalysis]: Checked inductivity of 8636 backedges. 0 proven. 8625 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:11:46,721 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2138558971] [2020-07-17 18:11:46,721 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:11:46,721 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [104] total 104 [2020-07-17 18:11:46,721 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86595793] [2020-07-17 18:11:46,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2020-07-17 18:11:46,722 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:11:46,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2020-07-17 18:11:46,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2705, Invalid=8007, Unknown=0, NotChecked=0, Total=10712 [2020-07-17 18:11:46,723 INFO L87 Difference]: Start difference. First operand 386 states and 388 transitions. Second operand 104 states. [2020-07-17 18:12:02,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:12:02,583 INFO L93 Difference]: Finished difference Result 423 states and 427 transitions. [2020-07-17 18:12:02,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 154 states. [2020-07-17 18:12:02,585 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 383 [2020-07-17 18:12:02,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:12:02,587 INFO L225 Difference]: With dead ends: 423 [2020-07-17 18:12:02,588 INFO L226 Difference]: Without dead ends: 398 [2020-07-17 18:12:02,589 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 202 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7499 ImplicationChecksByTransitivity, 23.5s TimeCoverageRelationStatistics Valid=13005, Invalid=28407, Unknown=0, NotChecked=0, Total=41412 [2020-07-17 18:12:02,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2020-07-17 18:12:02,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 393. [2020-07-17 18:12:02,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 393 states. [2020-07-17 18:12:02,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 393 states to 393 states and 395 transitions. [2020-07-17 18:12:02,595 INFO L78 Accepts]: Start accepts. Automaton has 393 states and 395 transitions. Word has length 383 [2020-07-17 18:12:02,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:12:02,596 INFO L479 AbstractCegarLoop]: Abstraction has 393 states and 395 transitions. [2020-07-17 18:12:02,596 INFO L480 AbstractCegarLoop]: Interpolant automaton has 104 states. [2020-07-17 18:12:02,596 INFO L276 IsEmpty]: Start isEmpty. Operand 393 states and 395 transitions. [2020-07-17 18:12:02,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 391 [2020-07-17 18:12:02,598 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:12:02,599 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 51, 51, 51, 51, 51, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:12:02,599 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-07-17 18:12:02,599 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:12:02,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:12:02,599 INFO L82 PathProgramCache]: Analyzing trace with hash -1870142923, now seen corresponding path program 50 times [2020-07-17 18:12:02,600 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:12:02,600 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [198924037] [2020-07-17 18:12:02,600 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:12:02,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:12:13,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:12:13,661 INFO L134 CoverageAnalysis]: Checked inductivity of 8987 backedges. 0 proven. 8976 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:12:13,661 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [198924037] [2020-07-17 18:12:13,661 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:12:13,661 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106] total 106 [2020-07-17 18:12:13,662 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698676650] [2020-07-17 18:12:13,662 INFO L459 AbstractCegarLoop]: Interpolant automaton has 106 states [2020-07-17 18:12:13,662 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:12:13,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2020-07-17 18:12:13,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2810, Invalid=8320, Unknown=0, NotChecked=0, Total=11130 [2020-07-17 18:12:13,664 INFO L87 Difference]: Start difference. First operand 393 states and 395 transitions. Second operand 106 states. [2020-07-17 18:12:30,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:12:30,821 INFO L93 Difference]: Finished difference Result 430 states and 434 transitions. [2020-07-17 18:12:30,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 157 states. [2020-07-17 18:12:30,823 INFO L78 Accepts]: Start accepts. Automaton has 106 states. Word has length 390 [2020-07-17 18:12:30,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:12:30,825 INFO L225 Difference]: With dead ends: 430 [2020-07-17 18:12:30,825 INFO L226 Difference]: Without dead ends: 405 [2020-07-17 18:12:30,827 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7802 ImplicationChecksByTransitivity, 26.3s TimeCoverageRelationStatistics Valid=13520, Invalid=29536, Unknown=0, NotChecked=0, Total=43056 [2020-07-17 18:12:30,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 405 states. [2020-07-17 18:12:30,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 405 to 400. [2020-07-17 18:12:30,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400 states. [2020-07-17 18:12:30,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 402 transitions. [2020-07-17 18:12:30,836 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 402 transitions. Word has length 390 [2020-07-17 18:12:30,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:12:30,837 INFO L479 AbstractCegarLoop]: Abstraction has 400 states and 402 transitions. [2020-07-17 18:12:30,837 INFO L480 AbstractCegarLoop]: Interpolant automaton has 106 states. [2020-07-17 18:12:30,837 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 402 transitions. [2020-07-17 18:12:30,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 398 [2020-07-17 18:12:30,839 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:12:30,840 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 52, 52, 52, 52, 52, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:12:30,840 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-07-17 18:12:30,840 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:12:30,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:12:30,841 INFO L82 PathProgramCache]: Analyzing trace with hash 1663754692, now seen corresponding path program 51 times [2020-07-17 18:12:30,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:12:30,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [794968092] [2020-07-17 18:12:30,841 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:12:30,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:12:43,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:12:43,352 INFO L134 CoverageAnalysis]: Checked inductivity of 9345 backedges. 0 proven. 9334 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:12:43,352 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [794968092] [2020-07-17 18:12:43,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:12:43,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [108] total 108 [2020-07-17 18:12:43,353 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1878186614] [2020-07-17 18:12:43,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 108 states [2020-07-17 18:12:43,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:12:43,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2020-07-17 18:12:43,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2917, Invalid=8639, Unknown=0, NotChecked=0, Total=11556 [2020-07-17 18:12:43,354 INFO L87 Difference]: Start difference. First operand 400 states and 402 transitions. Second operand 108 states. [2020-07-17 18:13:03,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:13:03,134 INFO L93 Difference]: Finished difference Result 437 states and 441 transitions. [2020-07-17 18:13:03,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 160 states. [2020-07-17 18:13:03,136 INFO L78 Accepts]: Start accepts. Automaton has 108 states. Word has length 397 [2020-07-17 18:13:03,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:13:03,138 INFO L225 Difference]: With dead ends: 437 [2020-07-17 18:13:03,139 INFO L226 Difference]: Without dead ends: 412 [2020-07-17 18:13:03,140 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 210 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8111 ImplicationChecksByTransitivity, 29.5s TimeCoverageRelationStatistics Valid=14045, Invalid=30687, Unknown=0, NotChecked=0, Total=44732 [2020-07-17 18:13:03,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 412 states. [2020-07-17 18:13:03,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 412 to 407. [2020-07-17 18:13:03,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 407 states. [2020-07-17 18:13:03,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 409 transitions. [2020-07-17 18:13:03,147 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 409 transitions. Word has length 397 [2020-07-17 18:13:03,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:13:03,147 INFO L479 AbstractCegarLoop]: Abstraction has 407 states and 409 transitions. [2020-07-17 18:13:03,147 INFO L480 AbstractCegarLoop]: Interpolant automaton has 108 states. [2020-07-17 18:13:03,147 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 409 transitions. [2020-07-17 18:13:03,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 405 [2020-07-17 18:13:03,150 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:13:03,150 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 53, 53, 53, 53, 53, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:13:03,151 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-07-17 18:13:03,151 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:13:03,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:13:03,151 INFO L82 PathProgramCache]: Analyzing trace with hash 147002197, now seen corresponding path program 52 times [2020-07-17 18:13:03,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:13:03,152 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [435439043] [2020-07-17 18:13:03,152 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:13:03,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:13:17,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:13:17,162 INFO L134 CoverageAnalysis]: Checked inductivity of 9710 backedges. 0 proven. 9699 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:13:17,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [435439043] [2020-07-17 18:13:17,162 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:13:17,162 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [110] total 110 [2020-07-17 18:13:17,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265683988] [2020-07-17 18:13:17,163 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2020-07-17 18:13:17,163 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:13:17,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2020-07-17 18:13:17,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3026, Invalid=8964, Unknown=0, NotChecked=0, Total=11990 [2020-07-17 18:13:17,164 INFO L87 Difference]: Start difference. First operand 407 states and 409 transitions. Second operand 110 states. [2020-07-17 18:13:39,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:13:39,289 INFO L93 Difference]: Finished difference Result 444 states and 448 transitions. [2020-07-17 18:13:39,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 163 states. [2020-07-17 18:13:39,292 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 404 [2020-07-17 18:13:39,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:13:39,294 INFO L225 Difference]: With dead ends: 444 [2020-07-17 18:13:39,295 INFO L226 Difference]: Without dead ends: 419 [2020-07-17 18:13:39,296 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 214 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8426 ImplicationChecksByTransitivity, 33.0s TimeCoverageRelationStatistics Valid=14580, Invalid=31860, Unknown=0, NotChecked=0, Total=46440 [2020-07-17 18:13:39,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2020-07-17 18:13:39,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 414. [2020-07-17 18:13:39,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 414 states. [2020-07-17 18:13:39,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 416 transitions. [2020-07-17 18:13:39,303 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 416 transitions. Word has length 404 [2020-07-17 18:13:39,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:13:39,304 INFO L479 AbstractCegarLoop]: Abstraction has 414 states and 416 transitions. [2020-07-17 18:13:39,304 INFO L480 AbstractCegarLoop]: Interpolant automaton has 110 states. [2020-07-17 18:13:39,304 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 416 transitions. [2020-07-17 18:13:39,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 412 [2020-07-17 18:13:39,306 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:13:39,306 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 54, 54, 54, 54, 54, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:13:39,306 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-07-17 18:13:39,306 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:13:39,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:13:39,307 INFO L82 PathProgramCache]: Analyzing trace with hash 1481387172, now seen corresponding path program 53 times [2020-07-17 18:13:39,307 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:13:39,307 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2088717172] [2020-07-17 18:13:39,308 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:13:39,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:13:54,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:13:54,746 INFO L134 CoverageAnalysis]: Checked inductivity of 10082 backedges. 0 proven. 10071 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:13:54,746 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2088717172] [2020-07-17 18:13:54,746 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:13:54,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [112] total 112 [2020-07-17 18:13:54,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675427203] [2020-07-17 18:13:54,747 INFO L459 AbstractCegarLoop]: Interpolant automaton has 112 states [2020-07-17 18:13:54,748 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:13:54,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2020-07-17 18:13:54,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3137, Invalid=9295, Unknown=0, NotChecked=0, Total=12432 [2020-07-17 18:13:54,749 INFO L87 Difference]: Start difference. First operand 414 states and 416 transitions. Second operand 112 states. [2020-07-17 18:14:20,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:14:20,066 INFO L93 Difference]: Finished difference Result 451 states and 455 transitions. [2020-07-17 18:14:20,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 166 states. [2020-07-17 18:14:20,069 INFO L78 Accepts]: Start accepts. Automaton has 112 states. Word has length 411 [2020-07-17 18:14:20,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:14:20,071 INFO L225 Difference]: With dead ends: 451 [2020-07-17 18:14:20,072 INFO L226 Difference]: Without dead ends: 426 [2020-07-17 18:14:20,074 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 218 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8747 ImplicationChecksByTransitivity, 37.3s TimeCoverageRelationStatistics Valid=15125, Invalid=33055, Unknown=0, NotChecked=0, Total=48180 [2020-07-17 18:14:20,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 426 states. [2020-07-17 18:14:20,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 426 to 421. [2020-07-17 18:14:20,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 421 states. [2020-07-17 18:14:20,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 421 states to 421 states and 423 transitions. [2020-07-17 18:14:20,084 INFO L78 Accepts]: Start accepts. Automaton has 421 states and 423 transitions. Word has length 411 [2020-07-17 18:14:20,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:14:20,084 INFO L479 AbstractCegarLoop]: Abstraction has 421 states and 423 transitions. [2020-07-17 18:14:20,085 INFO L480 AbstractCegarLoop]: Interpolant automaton has 112 states. [2020-07-17 18:14:20,085 INFO L276 IsEmpty]: Start isEmpty. Operand 421 states and 423 transitions. [2020-07-17 18:14:20,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 419 [2020-07-17 18:14:20,087 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:14:20,088 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 55, 55, 55, 55, 55, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:14:20,088 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2020-07-17 18:14:20,088 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:14:20,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:14:20,089 INFO L82 PathProgramCache]: Analyzing trace with hash 948030581, now seen corresponding path program 54 times [2020-07-17 18:14:20,089 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:14:20,089 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2007524379] [2020-07-17 18:14:20,089 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:14:20,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:14:37,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:14:37,947 INFO L134 CoverageAnalysis]: Checked inductivity of 10461 backedges. 0 proven. 10450 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:14:37,948 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2007524379] [2020-07-17 18:14:37,948 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:14:37,948 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [114] total 114 [2020-07-17 18:14:37,948 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163621050] [2020-07-17 18:14:37,949 INFO L459 AbstractCegarLoop]: Interpolant automaton has 114 states [2020-07-17 18:14:37,949 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:14:37,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2020-07-17 18:14:37,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3250, Invalid=9632, Unknown=0, NotChecked=0, Total=12882 [2020-07-17 18:14:37,951 INFO L87 Difference]: Start difference. First operand 421 states and 423 transitions. Second operand 114 states. [2020-07-17 18:15:06,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:15:06,635 INFO L93 Difference]: Finished difference Result 458 states and 462 transitions. [2020-07-17 18:15:06,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 169 states. [2020-07-17 18:15:06,639 INFO L78 Accepts]: Start accepts. Automaton has 114 states. Word has length 418 [2020-07-17 18:15:06,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:15:06,642 INFO L225 Difference]: With dead ends: 458 [2020-07-17 18:15:06,642 INFO L226 Difference]: Without dead ends: 433 [2020-07-17 18:15:06,644 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9074 ImplicationChecksByTransitivity, 42.5s TimeCoverageRelationStatistics Valid=15680, Invalid=34272, Unknown=0, NotChecked=0, Total=49952 [2020-07-17 18:15:06,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2020-07-17 18:15:06,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 428. [2020-07-17 18:15:06,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 428 states. [2020-07-17 18:15:06,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 430 transitions. [2020-07-17 18:15:06,653 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 430 transitions. Word has length 418 [2020-07-17 18:15:06,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:15:06,654 INFO L479 AbstractCegarLoop]: Abstraction has 428 states and 430 transitions. [2020-07-17 18:15:06,654 INFO L480 AbstractCegarLoop]: Interpolant automaton has 114 states. [2020-07-17 18:15:06,654 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 430 transitions. [2020-07-17 18:15:06,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2020-07-17 18:15:06,656 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:15:06,656 INFO L422 BasicCegarLoop]: trace histogram [56, 56, 56, 56, 56, 56, 56, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:15:06,656 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2020-07-17 18:15:06,657 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:15:06,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:15:06,657 INFO L82 PathProgramCache]: Analyzing trace with hash 1281421188, now seen corresponding path program 55 times [2020-07-17 18:15:06,657 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:15:06,657 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [545455186] [2020-07-17 18:15:06,657 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:15:06,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:15:26,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:15:26,566 INFO L134 CoverageAnalysis]: Checked inductivity of 10847 backedges. 0 proven. 10836 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:15:26,566 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [545455186] [2020-07-17 18:15:26,566 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:15:26,566 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [116] total 116 [2020-07-17 18:15:26,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467286425] [2020-07-17 18:15:26,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2020-07-17 18:15:26,567 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:15:26,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2020-07-17 18:15:26,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3365, Invalid=9975, Unknown=0, NotChecked=0, Total=13340 [2020-07-17 18:15:26,568 INFO L87 Difference]: Start difference. First operand 428 states and 430 transitions. Second operand 116 states. [2020-07-17 18:15:56,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:15:56,766 INFO L93 Difference]: Finished difference Result 465 states and 469 transitions. [2020-07-17 18:15:56,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 172 states. [2020-07-17 18:15:56,769 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 425 [2020-07-17 18:15:56,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:15:56,773 INFO L225 Difference]: With dead ends: 465 [2020-07-17 18:15:56,773 INFO L226 Difference]: Without dead ends: 440 [2020-07-17 18:15:56,775 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 226 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9407 ImplicationChecksByTransitivity, 47.4s TimeCoverageRelationStatistics Valid=16245, Invalid=35511, Unknown=0, NotChecked=0, Total=51756 [2020-07-17 18:15:56,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 440 states. [2020-07-17 18:15:56,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 440 to 435. [2020-07-17 18:15:56,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 435 states. [2020-07-17 18:15:56,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 437 transitions. [2020-07-17 18:15:56,784 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 437 transitions. Word has length 425 [2020-07-17 18:15:56,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:15:56,784 INFO L479 AbstractCegarLoop]: Abstraction has 435 states and 437 transitions. [2020-07-17 18:15:56,784 INFO L480 AbstractCegarLoop]: Interpolant automaton has 116 states. [2020-07-17 18:15:56,784 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 437 transitions. [2020-07-17 18:15:56,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 433 [2020-07-17 18:15:56,786 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:15:56,787 INFO L422 BasicCegarLoop]: trace histogram [57, 57, 57, 57, 57, 57, 57, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:15:56,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2020-07-17 18:15:56,787 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:15:56,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:15:56,787 INFO L82 PathProgramCache]: Analyzing trace with hash -822735467, now seen corresponding path program 56 times [2020-07-17 18:15:56,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:15:56,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1856251120] [2020-07-17 18:15:56,788 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:15:56,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:16:18,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:16:18,855 INFO L134 CoverageAnalysis]: Checked inductivity of 11240 backedges. 0 proven. 11229 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:16:18,856 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1856251120] [2020-07-17 18:16:18,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:16:18,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [118] total 118 [2020-07-17 18:16:18,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112289042] [2020-07-17 18:16:18,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 118 states [2020-07-17 18:16:18,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:16:18,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2020-07-17 18:16:18,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3482, Invalid=10324, Unknown=0, NotChecked=0, Total=13806 [2020-07-17 18:16:18,858 INFO L87 Difference]: Start difference. First operand 435 states and 437 transitions. Second operand 118 states. [2020-07-17 18:16:54,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:16:54,086 INFO L93 Difference]: Finished difference Result 472 states and 476 transitions. [2020-07-17 18:16:54,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 175 states. [2020-07-17 18:16:54,091 INFO L78 Accepts]: Start accepts. Automaton has 118 states. Word has length 432 [2020-07-17 18:16:54,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:16:54,094 INFO L225 Difference]: With dead ends: 472 [2020-07-17 18:16:54,094 INFO L226 Difference]: Without dead ends: 447 [2020-07-17 18:16:54,097 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 230 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9746 ImplicationChecksByTransitivity, 52.7s TimeCoverageRelationStatistics Valid=16820, Invalid=36772, Unknown=0, NotChecked=0, Total=53592 [2020-07-17 18:16:54,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 447 states. [2020-07-17 18:16:54,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 447 to 442. [2020-07-17 18:16:54,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 442 states. [2020-07-17 18:16:54,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 442 states to 442 states and 444 transitions. [2020-07-17 18:16:54,110 INFO L78 Accepts]: Start accepts. Automaton has 442 states and 444 transitions. Word has length 432 [2020-07-17 18:16:54,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:16:54,110 INFO L479 AbstractCegarLoop]: Abstraction has 442 states and 444 transitions. [2020-07-17 18:16:54,110 INFO L480 AbstractCegarLoop]: Interpolant automaton has 118 states. [2020-07-17 18:16:54,110 INFO L276 IsEmpty]: Start isEmpty. Operand 442 states and 444 transitions. [2020-07-17 18:16:54,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 440 [2020-07-17 18:16:54,113 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:16:54,114 INFO L422 BasicCegarLoop]: trace histogram [58, 58, 58, 58, 58, 58, 58, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:16:54,114 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2020-07-17 18:16:54,114 INFO L427 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:16:54,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:16:54,115 INFO L82 PathProgramCache]: Analyzing trace with hash 1945578084, now seen corresponding path program 57 times [2020-07-17 18:16:54,115 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:16:54,115 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1827086395] [2020-07-17 18:16:54,115 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:16:54,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:17:18,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:17:18,205 INFO L134 CoverageAnalysis]: Checked inductivity of 11640 backedges. 0 proven. 11629 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:17:18,205 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1827086395] [2020-07-17 18:17:18,205 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:17:18,205 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [120] total 120 [2020-07-17 18:17:18,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727454210] [2020-07-17 18:17:18,206 INFO L459 AbstractCegarLoop]: Interpolant automaton has 120 states [2020-07-17 18:17:18,206 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:17:18,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2020-07-17 18:17:18,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3601, Invalid=10679, Unknown=0, NotChecked=0, Total=14280 [2020-07-17 18:17:18,207 INFO L87 Difference]: Start difference. First operand 442 states and 444 transitions. Second operand 120 states. [2020-07-17 18:17:54,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:17:54,260 INFO L93 Difference]: Finished difference Result 479 states and 483 transitions. [2020-07-17 18:17:54,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 178 states. [2020-07-17 18:17:54,266 INFO L78 Accepts]: Start accepts. Automaton has 120 states. Word has length 439 [2020-07-17 18:17:54,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:17:54,268 INFO L225 Difference]: With dead ends: 479 [2020-07-17 18:17:54,268 INFO L226 Difference]: Without dead ends: 454 [2020-07-17 18:17:54,271 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 234 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10091 ImplicationChecksByTransitivity, 57.5s TimeCoverageRelationStatistics Valid=17405, Invalid=38055, Unknown=0, NotChecked=0, Total=55460 [2020-07-17 18:17:54,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2020-07-17 18:17:54,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 449. [2020-07-17 18:17:54,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 449 states. [2020-07-17 18:17:54,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 451 transitions. [2020-07-17 18:17:54,280 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 451 transitions. Word has length 439 [2020-07-17 18:17:54,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:17:54,281 INFO L479 AbstractCegarLoop]: Abstraction has 449 states and 451 transitions. [2020-07-17 18:17:54,281 INFO L480 AbstractCegarLoop]: Interpolant automaton has 120 states. [2020-07-17 18:17:54,281 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 451 transitions. [2020-07-17 18:17:54,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 447 [2020-07-17 18:17:54,283 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:17:54,284 INFO L422 BasicCegarLoop]: trace histogram [59, 59, 59, 59, 59, 59, 59, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:17:54,284 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2020-07-17 18:17:54,284 INFO L427 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:17:54,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:17:54,284 INFO L82 PathProgramCache]: Analyzing trace with hash -70134091, now seen corresponding path program 58 times [2020-07-17 18:17:54,285 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:17:54,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1968978004] [2020-07-17 18:17:54,285 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:17:54,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:18:20,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:18:21,089 INFO L134 CoverageAnalysis]: Checked inductivity of 12047 backedges. 0 proven. 12036 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:18:21,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1968978004] [2020-07-17 18:18:21,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:18:21,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [122] total 122 [2020-07-17 18:18:21,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395357442] [2020-07-17 18:18:21,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2020-07-17 18:18:21,091 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:18:21,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2020-07-17 18:18:21,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3722, Invalid=11040, Unknown=0, NotChecked=0, Total=14762 [2020-07-17 18:18:21,092 INFO L87 Difference]: Start difference. First operand 449 states and 451 transitions. Second operand 122 states. [2020-07-17 18:19:03,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:19:03,683 INFO L93 Difference]: Finished difference Result 486 states and 490 transitions. [2020-07-17 18:19:03,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 181 states. [2020-07-17 18:19:03,688 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 446 [2020-07-17 18:19:03,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:19:03,691 INFO L225 Difference]: With dead ends: 486 [2020-07-17 18:19:03,691 INFO L226 Difference]: Without dead ends: 461 [2020-07-17 18:19:03,693 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 238 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10442 ImplicationChecksByTransitivity, 64.0s TimeCoverageRelationStatistics Valid=18000, Invalid=39360, Unknown=0, NotChecked=0, Total=57360 [2020-07-17 18:19:03,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2020-07-17 18:19:03,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 456. [2020-07-17 18:19:03,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 456 states. [2020-07-17 18:19:03,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 458 transitions. [2020-07-17 18:19:03,702 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 458 transitions. Word has length 446 [2020-07-17 18:19:03,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:19:03,704 INFO L479 AbstractCegarLoop]: Abstraction has 456 states and 458 transitions. [2020-07-17 18:19:03,704 INFO L480 AbstractCegarLoop]: Interpolant automaton has 122 states. [2020-07-17 18:19:03,704 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 458 transitions. [2020-07-17 18:19:03,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 454 [2020-07-17 18:19:03,708 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:19:03,708 INFO L422 BasicCegarLoop]: trace histogram [60, 60, 60, 60, 60, 60, 60, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:19:03,708 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2020-07-17 18:19:03,708 INFO L427 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:19:03,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:19:03,709 INFO L82 PathProgramCache]: Analyzing trace with hash -216212156, now seen corresponding path program 59 times [2020-07-17 18:19:03,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:19:03,709 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1311434780] [2020-07-17 18:19:03,709 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:19:03,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:19:32,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 18:19:33,024 INFO L134 CoverageAnalysis]: Checked inductivity of 12461 backedges. 0 proven. 12450 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-17 18:19:33,024 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1311434780] [2020-07-17 18:19:33,026 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-17 18:19:33,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [124] total 124 [2020-07-17 18:19:33,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214936779] [2020-07-17 18:19:33,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 124 states [2020-07-17 18:19:33,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 18:19:33,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2020-07-17 18:19:33,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3845, Invalid=11407, Unknown=0, NotChecked=0, Total=15252 [2020-07-17 18:19:33,031 INFO L87 Difference]: Start difference. First operand 456 states and 458 transitions. Second operand 124 states. [2020-07-17 18:20:18,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 18:20:18,410 INFO L93 Difference]: Finished difference Result 493 states and 497 transitions. [2020-07-17 18:20:18,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 184 states. [2020-07-17 18:20:18,414 INFO L78 Accepts]: Start accepts. Automaton has 124 states. Word has length 453 [2020-07-17 18:20:18,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 18:20:18,417 INFO L225 Difference]: With dead ends: 493 [2020-07-17 18:20:18,417 INFO L226 Difference]: Without dead ends: 468 [2020-07-17 18:20:18,419 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 242 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10799 ImplicationChecksByTransitivity, 69.9s TimeCoverageRelationStatistics Valid=18605, Invalid=40687, Unknown=0, NotChecked=0, Total=59292 [2020-07-17 18:20:18,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 468 states. [2020-07-17 18:20:18,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 468 to 463. [2020-07-17 18:20:18,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 463 states. [2020-07-17 18:20:18,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 465 transitions. [2020-07-17 18:20:18,426 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 465 transitions. Word has length 453 [2020-07-17 18:20:18,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 18:20:18,427 INFO L479 AbstractCegarLoop]: Abstraction has 463 states and 465 transitions. [2020-07-17 18:20:18,427 INFO L480 AbstractCegarLoop]: Interpolant automaton has 124 states. [2020-07-17 18:20:18,427 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 465 transitions. [2020-07-17 18:20:18,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 461 [2020-07-17 18:20:18,429 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 18:20:18,430 INFO L422 BasicCegarLoop]: trace histogram [61, 61, 61, 61, 61, 61, 61, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 18:20:18,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63 [2020-07-17 18:20:18,430 INFO L427 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 18:20:18,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 18:20:18,430 INFO L82 PathProgramCache]: Analyzing trace with hash -1891162155, now seen corresponding path program 60 times [2020-07-17 18:20:18,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 18:20:18,430 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1501677699] [2020-07-17 18:20:18,431 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 18:20:18,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat