/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.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=DEEPEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/bitvector/soft_float_2a.c.cil.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 20:31:22,541 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 20:31:22,545 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 20:31:22,573 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 20:31:22,573 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 20:31:22,574 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 20:31:22,576 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 20:31:22,578 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 20:31:22,580 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 20:31:22,581 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 20:31:22,582 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 20:31:22,583 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 20:31:22,583 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 20:31:22,584 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 20:31:22,586 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 20:31:22,587 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 20:31:22,588 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 20:31:22,589 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 20:31:22,591 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 20:31:22,593 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 20:31:22,594 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 20:31:22,595 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 20:31:22,597 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 20:31:22,598 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 20:31:22,600 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 20:31:22,601 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 20:31:22,601 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 20:31:22,602 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 20:31:22,602 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 20:31:22,603 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 20:31:22,603 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 20:31:22,604 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 20:31:22,605 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 20:31:22,606 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 20:31:22,607 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 20:31:22,607 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 20:31:22,608 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 20:31:22,608 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 20:31:22,608 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 20:31:22,609 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 20:31:22,610 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 20:31:22,611 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 20:31:22,636 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 20:31:22,636 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 20:31:22,638 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 20:31:22,638 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 20:31:22,638 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 20:31:22,638 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 20:31:22,640 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 20:31:22,640 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 20:31:22,640 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 20:31:22,640 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 20:31:22,640 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 20:31:22,641 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 20:31:22,641 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 20:31:22,641 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 20:31:22,641 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 20:31:22,641 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 20:31:22,642 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 20:31:22,644 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 20:31:22,644 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 20:31:22,644 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 20:31:22,644 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 20:31:22,644 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 20:31:22,645 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 20:31:22,645 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 20:31:22,645 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 20:31:22,645 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 20:31:22,645 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 20:31:22,646 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 20:31:22,646 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 20:31:22,646 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES 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: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; [2020-08-21 20:31:22,946 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 20:31:22,959 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 20:31:22,962 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 20:31:22,964 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 20:31:22,964 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 20:31:22,965 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/bitvector/soft_float_2a.c.cil.c [2020-08-21 20:31:23,032 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8d3d934c9/50f8dbd1015d4d3cb08aa7b376a11b57/FLAGfe9f4c905 [2020-08-21 20:31:23,518 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 20:31:23,518 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/bitvector/soft_float_2a.c.cil.c [2020-08-21 20:31:23,527 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8d3d934c9/50f8dbd1015d4d3cb08aa7b376a11b57/FLAGfe9f4c905 [2020-08-21 20:31:23,899 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8d3d934c9/50f8dbd1015d4d3cb08aa7b376a11b57 [2020-08-21 20:31:23,910 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 20:31:23,912 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 20:31:23,913 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 20:31:23,913 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 20:31:23,917 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 20:31:23,918 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:31:23" (1/1) ... [2020-08-21 20:31:23,921 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2d6fb2f0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:23, skipping insertion in model container [2020-08-21 20:31:23,921 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:31:23" (1/1) ... [2020-08-21 20:31:23,929 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 20:31:23,967 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 20:31:24,213 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:31:24,218 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 20:31:24,260 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:31:24,361 INFO L208 MainTranslator]: Completed translation [2020-08-21 20:31:24,362 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:24 WrapperNode [2020-08-21 20:31:24,362 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 20:31:24,363 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 20:31:24,363 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 20:31:24,364 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 20:31:24,380 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:24" (1/1) ... [2020-08-21 20:31:24,381 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:24" (1/1) ... [2020-08-21 20:31:24,398 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:24" (1/1) ... [2020-08-21 20:31:24,398 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:24" (1/1) ... [2020-08-21 20:31:24,408 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:24" (1/1) ... [2020-08-21 20:31:24,416 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:24" (1/1) ... [2020-08-21 20:31:24,418 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:24" (1/1) ... [2020-08-21 20:31:24,422 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 20:31:24,423 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 20:31:24,423 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 20:31:24,423 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 20:31:24,426 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:24" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 20:31:24,481 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 20:31:24,481 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 20:31:24,481 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 20:31:24,481 INFO L138 BoogieDeclarations]: Found implementation of procedure base2flt [2020-08-21 20:31:24,482 INFO L138 BoogieDeclarations]: Found implementation of procedure addflt [2020-08-21 20:31:24,482 INFO L138 BoogieDeclarations]: Found implementation of procedure mulflt [2020-08-21 20:31:24,482 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 20:31:24,482 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 20:31:24,482 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-21 20:31:24,483 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-21 20:31:24,483 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 20:31:24,483 INFO L130 BoogieDeclarations]: Found specification of procedure base2flt [2020-08-21 20:31:24,483 INFO L130 BoogieDeclarations]: Found specification of procedure addflt [2020-08-21 20:31:24,483 INFO L130 BoogieDeclarations]: Found specification of procedure mulflt [2020-08-21 20:31:24,483 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 20:31:24,484 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 20:31:24,484 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 20:31:24,932 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 20:31:24,932 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-21 20:31:24,937 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:31:24 BoogieIcfgContainer [2020-08-21 20:31:24,937 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 20:31:24,938 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 20:31:24,938 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 20:31:24,941 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 20:31:24,941 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 08:31:23" (1/3) ... [2020-08-21 20:31:24,942 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1dc421a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:31:24, skipping insertion in model container [2020-08-21 20:31:24,942 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:31:24" (2/3) ... [2020-08-21 20:31:24,943 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1dc421a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:31:24, skipping insertion in model container [2020-08-21 20:31:24,943 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:31:24" (3/3) ... [2020-08-21 20:31:24,944 INFO L109 eAbstractionObserver]: Analyzing ICFG soft_float_2a.c.cil.c [2020-08-21 20:31:24,953 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 20:31:24,960 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 20:31:24,973 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 20:31:24,995 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 20:31:24,995 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 20:31:24,995 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 20:31:24,995 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 20:31:24,996 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 20:31:24,996 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 20:31:24,996 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 20:31:24,996 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 20:31:25,015 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states. [2020-08-21 20:31:25,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 20:31:25,024 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:25,025 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:25,026 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:25,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:25,031 INFO L82 PathProgramCache]: Analyzing trace with hash -1570912407, now seen corresponding path program 1 times [2020-08-21 20:31:25,038 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:25,038 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [206537077] [2020-08-21 20:31:25,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:25,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:25,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:25,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:25,219 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:25,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:25,229 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:25,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:25,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-21 20:31:25,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:25,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2020-08-21 20:31:25,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:25,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2020-08-21 20:31:25,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:25,491 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:25,492 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [206537077] [2020-08-21 20:31:25,495 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:25,496 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 20:31:25,497 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512179464] [2020-08-21 20:31:25,505 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 20:31:25,507 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:25,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 20:31:25,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 20:31:25,527 INFO L87 Difference]: Start difference. First operand 68 states. Second operand 4 states. [2020-08-21 20:31:25,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:25,721 INFO L93 Difference]: Finished difference Result 136 states and 213 transitions. [2020-08-21 20:31:25,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 20:31:25,725 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 48 [2020-08-21 20:31:25,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:25,744 INFO L225 Difference]: With dead ends: 136 [2020-08-21 20:31:25,744 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 20:31:25,750 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:31:25,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 20:31:25,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 62. [2020-08-21 20:31:25,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-21 20:31:25,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 86 transitions. [2020-08-21 20:31:25,834 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 86 transitions. Word has length 48 [2020-08-21 20:31:25,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:25,834 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 86 transitions. [2020-08-21 20:31:25,834 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 20:31:25,835 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 86 transitions. [2020-08-21 20:31:25,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 20:31:25,838 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:25,838 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:25,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 20:31:25,839 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:25,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:25,840 INFO L82 PathProgramCache]: Analyzing trace with hash -771486554, now seen corresponding path program 1 times [2020-08-21 20:31:25,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:25,840 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1892399715] [2020-08-21 20:31:25,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:25,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:25,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:25,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:25,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:25,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:25,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:25,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:25,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2020-08-21 20:31:25,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:25,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-21 20:31:25,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:25,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-21 20:31:25,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:25,955 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:25,955 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1892399715] [2020-08-21 20:31:25,956 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:25,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 20:31:25,957 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576785772] [2020-08-21 20:31:25,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 20:31:25,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:25,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 20:31:25,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 20:31:25,962 INFO L87 Difference]: Start difference. First operand 62 states and 86 transitions. Second operand 4 states. [2020-08-21 20:31:26,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:26,100 INFO L93 Difference]: Finished difference Result 129 states and 182 transitions. [2020-08-21 20:31:26,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 20:31:26,101 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 51 [2020-08-21 20:31:26,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:26,104 INFO L225 Difference]: With dead ends: 129 [2020-08-21 20:31:26,104 INFO L226 Difference]: Without dead ends: 79 [2020-08-21 20:31:26,106 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:31:26,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-21 20:31:26,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 72. [2020-08-21 20:31:26,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-21 20:31:26,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 101 transitions. [2020-08-21 20:31:26,136 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 101 transitions. Word has length 51 [2020-08-21 20:31:26,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:26,136 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 101 transitions. [2020-08-21 20:31:26,137 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 20:31:26,137 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 101 transitions. [2020-08-21 20:31:26,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-21 20:31:26,139 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:26,140 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:26,140 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 20:31:26,140 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:26,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:26,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1553856699, now seen corresponding path program 1 times [2020-08-21 20:31:26,141 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:26,141 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [572088916] [2020-08-21 20:31:26,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:26,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,177 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:26,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:26,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:26,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2020-08-21 20:31:26,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-21 20:31:26,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,276 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2020-08-21 20:31:26,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,286 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:26,287 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [572088916] [2020-08-21 20:31:26,287 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:26,287 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 20:31:26,287 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8519674] [2020-08-21 20:31:26,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 20:31:26,288 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:26,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 20:31:26,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:31:26,289 INFO L87 Difference]: Start difference. First operand 72 states and 101 transitions. Second operand 5 states. [2020-08-21 20:31:26,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:26,403 INFO L93 Difference]: Finished difference Result 145 states and 205 transitions. [2020-08-21 20:31:26,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 20:31:26,404 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 53 [2020-08-21 20:31:26,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:26,406 INFO L225 Difference]: With dead ends: 145 [2020-08-21 20:31:26,406 INFO L226 Difference]: Without dead ends: 89 [2020-08-21 20:31:26,407 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:31:26,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-21 20:31:26,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 74. [2020-08-21 20:31:26,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-21 20:31:26,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 104 transitions. [2020-08-21 20:31:26,422 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 104 transitions. Word has length 53 [2020-08-21 20:31:26,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:26,422 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 104 transitions. [2020-08-21 20:31:26,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 20:31:26,423 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 104 transitions. [2020-08-21 20:31:26,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 20:31:26,425 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:26,425 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:26,425 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 20:31:26,426 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:26,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:26,429 INFO L82 PathProgramCache]: Analyzing trace with hash 76110071, now seen corresponding path program 1 times [2020-08-21 20:31:26,429 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:26,430 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [527461694] [2020-08-21 20:31:26,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:26,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,481 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:26,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:26,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:26,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,558 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-21 20:31:26,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,568 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2020-08-21 20:31:26,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2020-08-21 20:31:26,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,585 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:26,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [527461694] [2020-08-21 20:31:26,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:26,586 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 20:31:26,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [830319155] [2020-08-21 20:31:26,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 20:31:26,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:26,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 20:31:26,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:31:26,588 INFO L87 Difference]: Start difference. First operand 74 states and 104 transitions. Second operand 5 states. [2020-08-21 20:31:26,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:26,665 INFO L93 Difference]: Finished difference Result 156 states and 218 transitions. [2020-08-21 20:31:26,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 20:31:26,666 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 54 [2020-08-21 20:31:26,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:26,668 INFO L225 Difference]: With dead ends: 156 [2020-08-21 20:31:26,668 INFO L226 Difference]: Without dead ends: 93 [2020-08-21 20:31:26,669 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:31:26,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-21 20:31:26,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 83. [2020-08-21 20:31:26,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 20:31:26,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 115 transitions. [2020-08-21 20:31:26,683 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 115 transitions. Word has length 54 [2020-08-21 20:31:26,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:26,684 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 115 transitions. [2020-08-21 20:31:26,684 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 20:31:26,684 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 115 transitions. [2020-08-21 20:31:26,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 20:31:26,687 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:26,687 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:26,687 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 20:31:26,688 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:26,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:26,688 INFO L82 PathProgramCache]: Analyzing trace with hash 1237680982, now seen corresponding path program 1 times [2020-08-21 20:31:26,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:26,689 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [449147662] [2020-08-21 20:31:26,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:26,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:26,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:26,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:26,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-21 20:31:26,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2020-08-21 20:31:26,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2020-08-21 20:31:26,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:26,830 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:26,830 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [449147662] [2020-08-21 20:31:26,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:26,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 20:31:26,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726847134] [2020-08-21 20:31:26,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 20:31:26,831 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:26,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 20:31:26,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:31:26,832 INFO L87 Difference]: Start difference. First operand 83 states and 115 transitions. Second operand 6 states. [2020-08-21 20:31:26,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:26,947 INFO L93 Difference]: Finished difference Result 166 states and 233 transitions. [2020-08-21 20:31:26,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 20:31:26,948 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 56 [2020-08-21 20:31:26,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:26,950 INFO L225 Difference]: With dead ends: 166 [2020-08-21 20:31:26,951 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 20:31:26,952 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2020-08-21 20:31:26,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 20:31:26,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 84. [2020-08-21 20:31:26,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-21 20:31:26,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 117 transitions. [2020-08-21 20:31:26,967 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 117 transitions. Word has length 56 [2020-08-21 20:31:26,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:26,968 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 117 transitions. [2020-08-21 20:31:26,968 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 20:31:26,968 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 117 transitions. [2020-08-21 20:31:26,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 20:31:26,971 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:26,971 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:26,971 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 20:31:26,971 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:26,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:26,972 INFO L82 PathProgramCache]: Analyzing trace with hash 714432262, now seen corresponding path program 2 times [2020-08-21 20:31:26,972 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:26,972 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1563029932] [2020-08-21 20:31:26,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:26,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:27,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:27,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,008 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:27,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-08-21 20:31:27,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2020-08-21 20:31:27,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,070 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-08-21 20:31:27,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,081 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:27,082 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1563029932] [2020-08-21 20:31:27,082 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:27,083 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 20:31:27,083 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144664893] [2020-08-21 20:31:27,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 20:31:27,084 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:27,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 20:31:27,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:31:27,085 INFO L87 Difference]: Start difference. First operand 84 states and 117 transitions. Second operand 6 states. [2020-08-21 20:31:27,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:27,194 INFO L93 Difference]: Finished difference Result 176 states and 245 transitions. [2020-08-21 20:31:27,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 20:31:27,195 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 57 [2020-08-21 20:31:27,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:27,197 INFO L225 Difference]: With dead ends: 176 [2020-08-21 20:31:27,197 INFO L226 Difference]: Without dead ends: 110 [2020-08-21 20:31:27,198 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2020-08-21 20:31:27,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-21 20:31:27,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 89. [2020-08-21 20:31:27,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-21 20:31:27,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 124 transitions. [2020-08-21 20:31:27,211 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 124 transitions. Word has length 57 [2020-08-21 20:31:27,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:27,211 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 124 transitions. [2020-08-21 20:31:27,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 20:31:27,211 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 124 transitions. [2020-08-21 20:31:27,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-21 20:31:27,213 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:27,213 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:27,213 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 20:31:27,214 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:27,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:27,214 INFO L82 PathProgramCache]: Analyzing trace with hash 484983205, now seen corresponding path program 2 times [2020-08-21 20:31:27,214 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:27,214 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1686107848] [2020-08-21 20:31:27,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:27,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:27,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:27,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,258 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:27,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2020-08-21 20:31:27,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-21 20:31:27,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-08-21 20:31:27,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,395 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:27,397 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1686107848] [2020-08-21 20:31:27,397 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:27,397 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 20:31:27,398 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290124933] [2020-08-21 20:31:27,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 20:31:27,398 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:27,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 20:31:27,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 20:31:27,401 INFO L87 Difference]: Start difference. First operand 89 states and 124 transitions. Second operand 7 states. [2020-08-21 20:31:27,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:27,536 INFO L93 Difference]: Finished difference Result 178 states and 251 transitions. [2020-08-21 20:31:27,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 20:31:27,537 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 59 [2020-08-21 20:31:27,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:27,539 INFO L225 Difference]: With dead ends: 178 [2020-08-21 20:31:27,539 INFO L226 Difference]: Without dead ends: 115 [2020-08-21 20:31:27,540 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:31:27,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-08-21 20:31:27,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 90. [2020-08-21 20:31:27,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-21 20:31:27,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 126 transitions. [2020-08-21 20:31:27,555 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 126 transitions. Word has length 59 [2020-08-21 20:31:27,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:27,555 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 126 transitions. [2020-08-21 20:31:27,556 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 20:31:27,556 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 126 transitions. [2020-08-21 20:31:27,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 20:31:27,557 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:27,557 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:27,557 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 20:31:27,557 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:27,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:27,558 INFO L82 PathProgramCache]: Analyzing trace with hash -1144362345, now seen corresponding path program 3 times [2020-08-21 20:31:27,558 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:27,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1779757537] [2020-08-21 20:31:27,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:27,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:27,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:27,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,585 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:27,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-21 20:31:27,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2020-08-21 20:31:27,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-08-21 20:31:27,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,654 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:27,655 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1779757537] [2020-08-21 20:31:27,655 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:27,655 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 20:31:27,656 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456665579] [2020-08-21 20:31:27,656 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 20:31:27,656 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:27,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 20:31:27,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2020-08-21 20:31:27,657 INFO L87 Difference]: Start difference. First operand 90 states and 126 transitions. Second operand 7 states. [2020-08-21 20:31:27,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:27,771 INFO L93 Difference]: Finished difference Result 193 states and 268 transitions. [2020-08-21 20:31:27,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 20:31:27,772 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 60 [2020-08-21 20:31:27,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:27,774 INFO L225 Difference]: With dead ends: 193 [2020-08-21 20:31:27,774 INFO L226 Difference]: Without dead ends: 124 [2020-08-21 20:31:27,775 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:31:27,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-21 20:31:27,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 95. [2020-08-21 20:31:27,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 20:31:27,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 133 transitions. [2020-08-21 20:31:27,787 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 133 transitions. Word has length 60 [2020-08-21 20:31:27,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:27,787 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 133 transitions. [2020-08-21 20:31:27,787 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 20:31:27,787 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 133 transitions. [2020-08-21 20:31:27,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 20:31:27,789 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:27,789 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:27,789 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 20:31:27,790 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:27,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:27,790 INFO L82 PathProgramCache]: Analyzing trace with hash 889761014, now seen corresponding path program 3 times [2020-08-21 20:31:27,791 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:27,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1835926595] [2020-08-21 20:31:27,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:27,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:27,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:27,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:27,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-21 20:31:27,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2020-08-21 20:31:27,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2020-08-21 20:31:27,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:27,958 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 4 proven. 26 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:27,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1835926595] [2020-08-21 20:31:27,959 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:27,959 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 20:31:27,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071471430] [2020-08-21 20:31:27,960 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 20:31:27,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:27,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 20:31:27,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:31:27,961 INFO L87 Difference]: Start difference. First operand 95 states and 133 transitions. Second operand 8 states. [2020-08-21 20:31:28,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:28,124 INFO L93 Difference]: Finished difference Result 190 states and 269 transitions. [2020-08-21 20:31:28,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 20:31:28,125 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 62 [2020-08-21 20:31:28,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:28,127 INFO L225 Difference]: With dead ends: 190 [2020-08-21 20:31:28,127 INFO L226 Difference]: Without dead ends: 124 [2020-08-21 20:31:28,128 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:31:28,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-21 20:31:28,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 96. [2020-08-21 20:31:28,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-08-21 20:31:28,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 135 transitions. [2020-08-21 20:31:28,138 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 135 transitions. Word has length 62 [2020-08-21 20:31:28,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:28,139 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 135 transitions. [2020-08-21 20:31:28,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 20:31:28,139 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 135 transitions. [2020-08-21 20:31:28,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-21 20:31:28,140 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:28,140 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:28,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 20:31:28,141 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:28,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:28,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1481152154, now seen corresponding path program 4 times [2020-08-21 20:31:28,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:28,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [457469829] [2020-08-21 20:31:28,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:28,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:28,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:28,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:28,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,243 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2020-08-21 20:31:28,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2020-08-21 20:31:28,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2020-08-21 20:31:28,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,260 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 4 proven. 34 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:28,262 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [457469829] [2020-08-21 20:31:28,262 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:28,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 20:31:28,263 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399676334] [2020-08-21 20:31:28,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 20:31:28,264 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:28,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 20:31:28,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:31:28,265 INFO L87 Difference]: Start difference. First operand 96 states and 135 transitions. Second operand 8 states. [2020-08-21 20:31:28,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:28,389 INFO L93 Difference]: Finished difference Result 210 states and 291 transitions. [2020-08-21 20:31:28,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 20:31:28,391 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 63 [2020-08-21 20:31:28,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:28,395 INFO L225 Difference]: With dead ends: 210 [2020-08-21 20:31:28,396 INFO L226 Difference]: Without dead ends: 138 [2020-08-21 20:31:28,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=35, Invalid=37, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:31:28,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-08-21 20:31:28,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 101. [2020-08-21 20:31:28,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-21 20:31:28,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 142 transitions. [2020-08-21 20:31:28,409 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 142 transitions. Word has length 63 [2020-08-21 20:31:28,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:28,410 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 142 transitions. [2020-08-21 20:31:28,410 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 20:31:28,410 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 142 transitions. [2020-08-21 20:31:28,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-21 20:31:28,411 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:28,411 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:28,411 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 20:31:28,412 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:28,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:28,412 INFO L82 PathProgramCache]: Analyzing trace with hash -642698235, now seen corresponding path program 4 times [2020-08-21 20:31:28,412 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:28,412 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1688666899] [2020-08-21 20:31:28,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:28,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:28,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,457 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:28,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,461 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:28,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2020-08-21 20:31:28,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-08-21 20:31:28,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,603 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2020-08-21 20:31:28,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,616 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 4 proven. 38 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:28,617 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1688666899] [2020-08-21 20:31:28,617 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:28,617 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 20:31:28,617 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112817276] [2020-08-21 20:31:28,618 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 20:31:28,618 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:28,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 20:31:28,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:31:28,619 INFO L87 Difference]: Start difference. First operand 101 states and 142 transitions. Second operand 9 states. [2020-08-21 20:31:28,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:28,777 INFO L93 Difference]: Finished difference Result 202 states and 287 transitions. [2020-08-21 20:31:28,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:31:28,795 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 65 [2020-08-21 20:31:28,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:28,797 INFO L225 Difference]: With dead ends: 202 [2020-08-21 20:31:28,797 INFO L226 Difference]: Without dead ends: 133 [2020-08-21 20:31:28,798 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:31:28,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-08-21 20:31:28,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 102. [2020-08-21 20:31:28,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-08-21 20:31:28,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 144 transitions. [2020-08-21 20:31:28,815 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 144 transitions. Word has length 65 [2020-08-21 20:31:28,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:28,815 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 144 transitions. [2020-08-21 20:31:28,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 20:31:28,815 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 144 transitions. [2020-08-21 20:31:28,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 20:31:28,816 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:28,817 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:28,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 20:31:28,817 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:28,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:28,817 INFO L82 PathProgramCache]: Analyzing trace with hash -1742748617, now seen corresponding path program 5 times [2020-08-21 20:31:28,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:28,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1164648693] [2020-08-21 20:31:28,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:28,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:28,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:28,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:28,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-21 20:31:28,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2020-08-21 20:31:28,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2020-08-21 20:31:28,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:28,935 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 4 proven. 48 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:28,936 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1164648693] [2020-08-21 20:31:28,936 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:28,936 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 20:31:28,936 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495528190] [2020-08-21 20:31:28,937 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 20:31:28,937 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:28,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 20:31:28,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=37, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:31:28,938 INFO L87 Difference]: Start difference. First operand 102 states and 144 transitions. Second operand 9 states. [2020-08-21 20:31:29,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:29,051 INFO L93 Difference]: Finished difference Result 227 states and 314 transitions. [2020-08-21 20:31:29,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:31:29,052 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 66 [2020-08-21 20:31:29,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:29,053 INFO L225 Difference]: With dead ends: 227 [2020-08-21 20:31:29,054 INFO L226 Difference]: Without dead ends: 152 [2020-08-21 20:31:29,055 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=44, Invalid=46, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:31:29,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2020-08-21 20:31:29,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 107. [2020-08-21 20:31:29,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-21 20:31:29,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 151 transitions. [2020-08-21 20:31:29,068 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 151 transitions. Word has length 66 [2020-08-21 20:31:29,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:29,068 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 151 transitions. [2020-08-21 20:31:29,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 20:31:29,068 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 151 transitions. [2020-08-21 20:31:29,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 20:31:29,069 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:29,070 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:29,070 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 20:31:29,070 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:29,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:29,070 INFO L82 PathProgramCache]: Analyzing trace with hash 1366171286, now seen corresponding path program 5 times [2020-08-21 20:31:29,071 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:29,071 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [102597210] [2020-08-21 20:31:29,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:29,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:29,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:29,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:29,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,237 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2020-08-21 20:31:29,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-08-21 20:31:29,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,243 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2020-08-21 20:31:29,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,253 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 4 proven. 53 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:29,253 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [102597210] [2020-08-21 20:31:29,254 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:29,254 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 20:31:29,254 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193776863] [2020-08-21 20:31:29,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 20:31:29,255 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:29,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 20:31:29,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:31:29,255 INFO L87 Difference]: Start difference. First operand 107 states and 151 transitions. Second operand 10 states. [2020-08-21 20:31:29,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:29,487 INFO L93 Difference]: Finished difference Result 214 states and 305 transitions. [2020-08-21 20:31:29,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 20:31:29,488 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 68 [2020-08-21 20:31:29,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:29,490 INFO L225 Difference]: With dead ends: 214 [2020-08-21 20:31:29,490 INFO L226 Difference]: Without dead ends: 142 [2020-08-21 20:31:29,491 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:31:29,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2020-08-21 20:31:29,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 108. [2020-08-21 20:31:29,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-08-21 20:31:29,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 153 transitions. [2020-08-21 20:31:29,503 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 153 transitions. Word has length 68 [2020-08-21 20:31:29,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:29,503 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 153 transitions. [2020-08-21 20:31:29,503 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 20:31:29,504 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 153 transitions. [2020-08-21 20:31:29,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-21 20:31:29,505 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:29,505 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:29,506 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 20:31:29,506 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:29,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:29,506 INFO L82 PathProgramCache]: Analyzing trace with hash 402664390, now seen corresponding path program 6 times [2020-08-21 20:31:29,507 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:29,507 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1823854062] [2020-08-21 20:31:29,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:29,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:29,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:29,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:29,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,630 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2020-08-21 20:31:29,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2020-08-21 20:31:29,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2020-08-21 20:31:29,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,650 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 4 proven. 65 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:29,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1823854062] [2020-08-21 20:31:29,651 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:29,651 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 20:31:29,651 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820235558] [2020-08-21 20:31:29,652 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 20:31:29,652 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:29,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 20:31:29,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=46, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:31:29,652 INFO L87 Difference]: Start difference. First operand 108 states and 153 transitions. Second operand 10 states. [2020-08-21 20:31:29,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:29,790 INFO L93 Difference]: Finished difference Result 244 states and 337 transitions. [2020-08-21 20:31:29,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 20:31:29,791 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 69 [2020-08-21 20:31:29,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:29,793 INFO L225 Difference]: With dead ends: 244 [2020-08-21 20:31:29,793 INFO L226 Difference]: Without dead ends: 166 [2020-08-21 20:31:29,794 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=54, Invalid=56, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:31:29,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2020-08-21 20:31:29,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 113. [2020-08-21 20:31:29,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-08-21 20:31:29,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 160 transitions. [2020-08-21 20:31:29,806 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 160 transitions. Word has length 69 [2020-08-21 20:31:29,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:29,807 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 160 transitions. [2020-08-21 20:31:29,807 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 20:31:29,807 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 160 transitions. [2020-08-21 20:31:29,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-21 20:31:29,808 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:29,809 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:29,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 20:31:29,809 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:29,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:29,809 INFO L82 PathProgramCache]: Analyzing trace with hash 1523768933, now seen corresponding path program 6 times [2020-08-21 20:31:29,810 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:29,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [96307763] [2020-08-21 20:31:29,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:29,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:29,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:29,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:29,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2020-08-21 20:31:29,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2020-08-21 20:31:29,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:29,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2020-08-21 20:31:29,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,003 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 4 proven. 71 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:30,004 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [96307763] [2020-08-21 20:31:30,004 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:30,004 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 20:31:30,004 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171757986] [2020-08-21 20:31:30,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 20:31:30,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:30,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 20:31:30,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:31:30,006 INFO L87 Difference]: Start difference. First operand 113 states and 160 transitions. Second operand 11 states. [2020-08-21 20:31:30,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:30,279 INFO L93 Difference]: Finished difference Result 226 states and 323 transitions. [2020-08-21 20:31:30,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 20:31:30,280 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 71 [2020-08-21 20:31:30,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:30,282 INFO L225 Difference]: With dead ends: 226 [2020-08-21 20:31:30,282 INFO L226 Difference]: Without dead ends: 151 [2020-08-21 20:31:30,283 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:31:30,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2020-08-21 20:31:30,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 114. [2020-08-21 20:31:30,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2020-08-21 20:31:30,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 162 transitions. [2020-08-21 20:31:30,293 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 162 transitions. Word has length 71 [2020-08-21 20:31:30,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:30,294 INFO L479 AbstractCegarLoop]: Abstraction has 114 states and 162 transitions. [2020-08-21 20:31:30,294 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 20:31:30,294 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 162 transitions. [2020-08-21 20:31:30,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 20:31:30,295 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:30,295 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:30,296 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 20:31:30,296 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:30,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:30,296 INFO L82 PathProgramCache]: Analyzing trace with hash 993224151, now seen corresponding path program 7 times [2020-08-21 20:31:30,296 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:30,297 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [708303050] [2020-08-21 20:31:30,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:30,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:30,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,317 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:30,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,318 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:30,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-08-21 20:31:30,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2020-08-21 20:31:30,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2020-08-21 20:31:30,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,439 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 4 proven. 85 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:30,439 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [708303050] [2020-08-21 20:31:30,440 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:30,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 20:31:30,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451398457] [2020-08-21 20:31:30,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 20:31:30,441 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:30,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 20:31:30,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=56, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:31:30,441 INFO L87 Difference]: Start difference. First operand 114 states and 162 transitions. Second operand 11 states. [2020-08-21 20:31:30,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:30,592 INFO L93 Difference]: Finished difference Result 261 states and 360 transitions. [2020-08-21 20:31:30,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 20:31:30,593 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 72 [2020-08-21 20:31:30,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:30,594 INFO L225 Difference]: With dead ends: 261 [2020-08-21 20:31:30,595 INFO L226 Difference]: Without dead ends: 180 [2020-08-21 20:31:30,596 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=65, Invalid=67, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:31:30,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2020-08-21 20:31:30,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 119. [2020-08-21 20:31:30,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2020-08-21 20:31:30,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 169 transitions. [2020-08-21 20:31:30,607 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 169 transitions. Word has length 72 [2020-08-21 20:31:30,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:30,607 INFO L479 AbstractCegarLoop]: Abstraction has 119 states and 169 transitions. [2020-08-21 20:31:30,607 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 20:31:30,607 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 169 transitions. [2020-08-21 20:31:30,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-21 20:31:30,608 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:30,609 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:30,609 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 20:31:30,609 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:30,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:30,610 INFO L82 PathProgramCache]: Analyzing trace with hash 2116016182, now seen corresponding path program 7 times [2020-08-21 20:31:30,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:30,610 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [563809140] [2020-08-21 20:31:30,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:30,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,631 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:30,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:30,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:30,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-08-21 20:31:30,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2020-08-21 20:31:30,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2020-08-21 20:31:30,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:30,839 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 4 proven. 92 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:30,839 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [563809140] [2020-08-21 20:31:30,839 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:30,840 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 20:31:30,840 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622995960] [2020-08-21 20:31:30,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 20:31:30,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:30,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 20:31:30,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:31:30,841 INFO L87 Difference]: Start difference. First operand 119 states and 169 transitions. Second operand 12 states. [2020-08-21 20:31:31,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:31,087 INFO L93 Difference]: Finished difference Result 238 states and 341 transitions. [2020-08-21 20:31:31,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 20:31:31,088 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 74 [2020-08-21 20:31:31,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:31,089 INFO L225 Difference]: With dead ends: 238 [2020-08-21 20:31:31,090 INFO L226 Difference]: Without dead ends: 160 [2020-08-21 20:31:31,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:31:31,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2020-08-21 20:31:31,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 120. [2020-08-21 20:31:31,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-08-21 20:31:31,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 171 transitions. [2020-08-21 20:31:31,101 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 171 transitions. Word has length 74 [2020-08-21 20:31:31,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:31,101 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 171 transitions. [2020-08-21 20:31:31,102 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 20:31:31,102 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 171 transitions. [2020-08-21 20:31:31,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-21 20:31:31,103 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:31,103 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:31,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 20:31:31,103 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:31,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:31,104 INFO L82 PathProgramCache]: Analyzing trace with hash -2121947610, now seen corresponding path program 8 times [2020-08-21 20:31:31,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:31,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [788843741] [2020-08-21 20:31:31,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:31,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:31,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:31,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:31,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-08-21 20:31:31,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2020-08-21 20:31:31,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,256 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2020-08-21 20:31:31,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,269 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 4 proven. 108 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:31,270 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [788843741] [2020-08-21 20:31:31,270 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:31,270 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 20:31:31,270 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941313260] [2020-08-21 20:31:31,271 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 20:31:31,271 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:31,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 20:31:31,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=67, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:31:31,272 INFO L87 Difference]: Start difference. First operand 120 states and 171 transitions. Second operand 12 states. [2020-08-21 20:31:31,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:31,435 INFO L93 Difference]: Finished difference Result 278 states and 383 transitions. [2020-08-21 20:31:31,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 20:31:31,435 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 75 [2020-08-21 20:31:31,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:31,437 INFO L225 Difference]: With dead ends: 278 [2020-08-21 20:31:31,437 INFO L226 Difference]: Without dead ends: 194 [2020-08-21 20:31:31,439 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=79, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:31:31,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2020-08-21 20:31:31,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 125. [2020-08-21 20:31:31,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-08-21 20:31:31,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 178 transitions. [2020-08-21 20:31:31,452 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 178 transitions. Word has length 75 [2020-08-21 20:31:31,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:31,452 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 178 transitions. [2020-08-21 20:31:31,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 20:31:31,452 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 178 transitions. [2020-08-21 20:31:31,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-21 20:31:31,454 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:31,454 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:31,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 20:31:31,454 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:31,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:31,455 INFO L82 PathProgramCache]: Analyzing trace with hash 2028159173, now seen corresponding path program 8 times [2020-08-21 20:31:31,455 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:31,455 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1035650133] [2020-08-21 20:31:31,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:31,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:31,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:31,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:31,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2020-08-21 20:31:31,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2020-08-21 20:31:31,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2020-08-21 20:31:31,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:31,732 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 4 proven. 116 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:31,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1035650133] [2020-08-21 20:31:31,732 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:31,733 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 20:31:31,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277519843] [2020-08-21 20:31:31,734 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 20:31:31,734 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:31,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 20:31:31,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:31:31,734 INFO L87 Difference]: Start difference. First operand 125 states and 178 transitions. Second operand 13 states. [2020-08-21 20:31:32,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:32,010 INFO L93 Difference]: Finished difference Result 250 states and 359 transitions. [2020-08-21 20:31:32,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 20:31:32,011 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 77 [2020-08-21 20:31:32,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:32,013 INFO L225 Difference]: With dead ends: 250 [2020-08-21 20:31:32,013 INFO L226 Difference]: Without dead ends: 169 [2020-08-21 20:31:32,014 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=128, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:31:32,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2020-08-21 20:31:32,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 126. [2020-08-21 20:31:32,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2020-08-21 20:31:32,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 180 transitions. [2020-08-21 20:31:32,025 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 180 transitions. Word has length 77 [2020-08-21 20:31:32,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:32,026 INFO L479 AbstractCegarLoop]: Abstraction has 126 states and 180 transitions. [2020-08-21 20:31:32,026 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 20:31:32,026 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 180 transitions. [2020-08-21 20:31:32,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 20:31:32,027 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:32,027 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:32,027 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 20:31:32,028 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:32,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:32,028 INFO L82 PathProgramCache]: Analyzing trace with hash -550547593, now seen corresponding path program 9 times [2020-08-21 20:31:32,028 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:32,028 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [625908382] [2020-08-21 20:31:32,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:32,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:32,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:32,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,050 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:32,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2020-08-21 20:31:32,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,198 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2020-08-21 20:31:32,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-08-21 20:31:32,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,213 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 4 proven. 134 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:32,214 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [625908382] [2020-08-21 20:31:32,214 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:32,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 20:31:32,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004374322] [2020-08-21 20:31:32,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 20:31:32,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:32,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 20:31:32,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=79, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:31:32,215 INFO L87 Difference]: Start difference. First operand 126 states and 180 transitions. Second operand 13 states. [2020-08-21 20:31:32,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:32,393 INFO L93 Difference]: Finished difference Result 295 states and 406 transitions. [2020-08-21 20:31:32,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 20:31:32,393 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 78 [2020-08-21 20:31:32,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:32,395 INFO L225 Difference]: With dead ends: 295 [2020-08-21 20:31:32,396 INFO L226 Difference]: Without dead ends: 208 [2020-08-21 20:31:32,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=92, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:31:32,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-08-21 20:31:32,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 131. [2020-08-21 20:31:32,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2020-08-21 20:31:32,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 187 transitions. [2020-08-21 20:31:32,411 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 187 transitions. Word has length 78 [2020-08-21 20:31:32,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:32,412 INFO L479 AbstractCegarLoop]: Abstraction has 131 states and 187 transitions. [2020-08-21 20:31:32,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 20:31:32,412 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 187 transitions. [2020-08-21 20:31:32,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-21 20:31:32,414 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:32,414 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:32,415 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 20:31:32,415 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:32,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:32,415 INFO L82 PathProgramCache]: Analyzing trace with hash 315087318, now seen corresponding path program 9 times [2020-08-21 20:31:32,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:32,416 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [281084194] [2020-08-21 20:31:32,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:32,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,437 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:32,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,438 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:32,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,440 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:32,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2020-08-21 20:31:32,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2020-08-21 20:31:32,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,694 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 66 [2020-08-21 20:31:32,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:32,710 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 4 proven. 143 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:32,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [281084194] [2020-08-21 20:31:32,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:32,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 20:31:32,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117123730] [2020-08-21 20:31:32,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 20:31:32,711 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:32,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 20:31:32,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:31:32,712 INFO L87 Difference]: Start difference. First operand 131 states and 187 transitions. Second operand 14 states. [2020-08-21 20:31:33,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:33,104 INFO L93 Difference]: Finished difference Result 262 states and 377 transitions. [2020-08-21 20:31:33,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 20:31:33,105 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 80 [2020-08-21 20:31:33,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:33,107 INFO L225 Difference]: With dead ends: 262 [2020-08-21 20:31:33,107 INFO L226 Difference]: Without dead ends: 178 [2020-08-21 20:31:33,109 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2020-08-21 20:31:33,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-08-21 20:31:33,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 132. [2020-08-21 20:31:33,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2020-08-21 20:31:33,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 189 transitions. [2020-08-21 20:31:33,127 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 189 transitions. Word has length 80 [2020-08-21 20:31:33,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:33,128 INFO L479 AbstractCegarLoop]: Abstraction has 132 states and 189 transitions. [2020-08-21 20:31:33,128 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 20:31:33,128 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 189 transitions. [2020-08-21 20:31:33,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-21 20:31:33,130 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:33,130 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:33,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 20:31:33,133 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:33,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:33,133 INFO L82 PathProgramCache]: Analyzing trace with hash -2116167546, now seen corresponding path program 10 times [2020-08-21 20:31:33,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:33,134 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [967226935] [2020-08-21 20:31:33,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:33,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:33,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:33,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,174 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:33,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2020-08-21 20:31:33,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2020-08-21 20:31:33,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2020-08-21 20:31:33,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,407 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 4 proven. 163 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:33,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [967226935] [2020-08-21 20:31:33,409 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:33,410 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 20:31:33,410 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019918176] [2020-08-21 20:31:33,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 20:31:33,410 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:33,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 20:31:33,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=92, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:31:33,411 INFO L87 Difference]: Start difference. First operand 132 states and 189 transitions. Second operand 14 states. [2020-08-21 20:31:33,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:33,660 INFO L93 Difference]: Finished difference Result 312 states and 429 transitions. [2020-08-21 20:31:33,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 20:31:33,663 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 81 [2020-08-21 20:31:33,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:33,666 INFO L225 Difference]: With dead ends: 312 [2020-08-21 20:31:33,667 INFO L226 Difference]: Without dead ends: 222 [2020-08-21 20:31:33,668 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=106, Unknown=0, NotChecked=0, Total=210 [2020-08-21 20:31:33,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2020-08-21 20:31:33,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 137. [2020-08-21 20:31:33,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2020-08-21 20:31:33,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 196 transitions. [2020-08-21 20:31:33,688 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 196 transitions. Word has length 81 [2020-08-21 20:31:33,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:33,688 INFO L479 AbstractCegarLoop]: Abstraction has 137 states and 196 transitions. [2020-08-21 20:31:33,689 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 20:31:33,689 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 196 transitions. [2020-08-21 20:31:33,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-21 20:31:33,691 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:33,691 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:33,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 20:31:33,691 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:33,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:33,692 INFO L82 PathProgramCache]: Analyzing trace with hash -1007133915, now seen corresponding path program 10 times [2020-08-21 20:31:33,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:33,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [152827515] [2020-08-21 20:31:33,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:33,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,727 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:33,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:33,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:33,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:33,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2020-08-21 20:31:34,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,030 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2020-08-21 20:31:34,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69 [2020-08-21 20:31:34,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,067 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 4 proven. 173 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:34,075 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [152827515] [2020-08-21 20:31:34,075 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:34,076 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 20:31:34,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468857690] [2020-08-21 20:31:34,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 20:31:34,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:34,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 20:31:34,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-08-21 20:31:34,080 INFO L87 Difference]: Start difference. First operand 137 states and 196 transitions. Second operand 15 states. [2020-08-21 20:31:34,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:34,502 INFO L93 Difference]: Finished difference Result 274 states and 395 transitions. [2020-08-21 20:31:34,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 20:31:34,503 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 83 [2020-08-21 20:31:34,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:34,504 INFO L225 Difference]: With dead ends: 274 [2020-08-21 20:31:34,504 INFO L226 Difference]: Without dead ends: 187 [2020-08-21 20:31:34,505 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2020-08-21 20:31:34,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-08-21 20:31:34,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 138. [2020-08-21 20:31:34,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2020-08-21 20:31:34,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 198 transitions. [2020-08-21 20:31:34,519 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 198 transitions. Word has length 83 [2020-08-21 20:31:34,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:34,519 INFO L479 AbstractCegarLoop]: Abstraction has 138 states and 198 transitions. [2020-08-21 20:31:34,519 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 20:31:34,519 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 198 transitions. [2020-08-21 20:31:34,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 20:31:34,521 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:34,521 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:34,521 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 20:31:34,521 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:34,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:34,521 INFO L82 PathProgramCache]: Analyzing trace with hash -155352809, now seen corresponding path program 11 times [2020-08-21 20:31:34,522 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:34,522 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [845249540] [2020-08-21 20:31:34,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:34,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:34,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:34,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:34,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2020-08-21 20:31:34,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 62 [2020-08-21 20:31:34,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 70 [2020-08-21 20:31:34,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,734 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 4 proven. 195 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:34,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [845249540] [2020-08-21 20:31:34,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:34,735 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 20:31:34,735 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121328327] [2020-08-21 20:31:34,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 20:31:34,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:34,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 20:31:34,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=106, Unknown=0, NotChecked=0, Total=210 [2020-08-21 20:31:34,736 INFO L87 Difference]: Start difference. First operand 138 states and 198 transitions. Second operand 15 states. [2020-08-21 20:31:34,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:34,896 INFO L93 Difference]: Finished difference Result 329 states and 452 transitions. [2020-08-21 20:31:34,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 20:31:34,897 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 84 [2020-08-21 20:31:34,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:34,899 INFO L225 Difference]: With dead ends: 329 [2020-08-21 20:31:34,899 INFO L226 Difference]: Without dead ends: 236 [2020-08-21 20:31:34,900 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=119, Invalid=121, Unknown=0, NotChecked=0, Total=240 [2020-08-21 20:31:34,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2020-08-21 20:31:34,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 143. [2020-08-21 20:31:34,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2020-08-21 20:31:34,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 205 transitions. [2020-08-21 20:31:34,913 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 205 transitions. Word has length 84 [2020-08-21 20:31:34,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:34,913 INFO L479 AbstractCegarLoop]: Abstraction has 143 states and 205 transitions. [2020-08-21 20:31:34,913 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 20:31:34,913 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 205 transitions. [2020-08-21 20:31:34,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-21 20:31:34,914 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:34,915 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:34,915 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 20:31:34,915 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:34,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:34,915 INFO L82 PathProgramCache]: Analyzing trace with hash 2140152694, now seen corresponding path program 11 times [2020-08-21 20:31:34,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:34,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2135765865] [2020-08-21 20:31:34,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:34,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:34,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:34,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:34,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:34,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2020-08-21 20:31:35,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-08-21 20:31:35,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 72 [2020-08-21 20:31:35,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,272 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 4 proven. 206 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:35,272 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2135765865] [2020-08-21 20:31:35,273 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:35,273 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 20:31:35,273 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705644927] [2020-08-21 20:31:35,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 20:31:35,274 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:35,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 20:31:35,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2020-08-21 20:31:35,274 INFO L87 Difference]: Start difference. First operand 143 states and 205 transitions. Second operand 16 states. [2020-08-21 20:31:35,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:35,677 INFO L93 Difference]: Finished difference Result 286 states and 413 transitions. [2020-08-21 20:31:35,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 20:31:35,678 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 86 [2020-08-21 20:31:35,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:35,679 INFO L225 Difference]: With dead ends: 286 [2020-08-21 20:31:35,679 INFO L226 Difference]: Without dead ends: 196 [2020-08-21 20:31:35,680 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=69, Invalid=203, Unknown=0, NotChecked=0, Total=272 [2020-08-21 20:31:35,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2020-08-21 20:31:35,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 144. [2020-08-21 20:31:35,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-08-21 20:31:35,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 207 transitions. [2020-08-21 20:31:35,695 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 207 transitions. Word has length 86 [2020-08-21 20:31:35,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:35,695 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 207 transitions. [2020-08-21 20:31:35,696 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 20:31:35,696 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 207 transitions. [2020-08-21 20:31:35,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-21 20:31:35,697 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:35,697 INFO L422 BasicCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:35,697 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 20:31:35,697 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:35,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:35,698 INFO L82 PathProgramCache]: Analyzing trace with hash -1373715738, now seen corresponding path program 12 times [2020-08-21 20:31:35,698 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:35,698 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [301250341] [2020-08-21 20:31:35,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:35,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,735 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:35,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:35,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:35,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2020-08-21 20:31:35,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2020-08-21 20:31:35,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73 [2020-08-21 20:31:35,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:35,955 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 4 proven. 230 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:35,956 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [301250341] [2020-08-21 20:31:35,956 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:35,956 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 20:31:35,956 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386881811] [2020-08-21 20:31:35,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 20:31:35,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:35,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 20:31:35,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=121, Unknown=0, NotChecked=0, Total=240 [2020-08-21 20:31:35,958 INFO L87 Difference]: Start difference. First operand 144 states and 207 transitions. Second operand 16 states. [2020-08-21 20:31:36,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:36,170 INFO L93 Difference]: Finished difference Result 346 states and 475 transitions. [2020-08-21 20:31:36,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 20:31:36,171 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 87 [2020-08-21 20:31:36,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:36,173 INFO L225 Difference]: With dead ends: 346 [2020-08-21 20:31:36,173 INFO L226 Difference]: Without dead ends: 250 [2020-08-21 20:31:36,174 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=135, Invalid=137, Unknown=0, NotChecked=0, Total=272 [2020-08-21 20:31:36,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-08-21 20:31:36,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 149. [2020-08-21 20:31:36,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2020-08-21 20:31:36,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 214 transitions. [2020-08-21 20:31:36,189 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 214 transitions. Word has length 87 [2020-08-21 20:31:36,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:36,189 INFO L479 AbstractCegarLoop]: Abstraction has 149 states and 214 transitions. [2020-08-21 20:31:36,189 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 20:31:36,189 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 214 transitions. [2020-08-21 20:31:36,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-21 20:31:36,191 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:36,191 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:36,191 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 20:31:36,191 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:36,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:36,192 INFO L82 PathProgramCache]: Analyzing trace with hash -475517563, now seen corresponding path program 12 times [2020-08-21 20:31:36,192 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:36,192 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1892893471] [2020-08-21 20:31:36,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:36,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:36,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:36,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:36,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2020-08-21 20:31:36,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,261 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2020-08-21 20:31:36,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 75 [2020-08-21 20:31:36,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,269 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2020-08-21 20:31:36,270 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1892893471] [2020-08-21 20:31:36,270 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:31:36,270 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 20:31:36,270 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739245419] [2020-08-21 20:31:36,271 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 20:31:36,271 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:36,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 20:31:36,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 20:31:36,273 INFO L87 Difference]: Start difference. First operand 149 states and 214 transitions. Second operand 3 states. [2020-08-21 20:31:36,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:36,290 INFO L93 Difference]: Finished difference Result 160 states and 227 transitions. [2020-08-21 20:31:36,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 20:31:36,292 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 89 [2020-08-21 20:31:36,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:36,293 INFO L225 Difference]: With dead ends: 160 [2020-08-21 20:31:36,293 INFO L226 Difference]: Without dead ends: 149 [2020-08-21 20:31:36,293 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 20:31:36,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2020-08-21 20:31:36,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2020-08-21 20:31:36,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2020-08-21 20:31:36,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 213 transitions. [2020-08-21 20:31:36,305 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 213 transitions. Word has length 89 [2020-08-21 20:31:36,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:36,305 INFO L479 AbstractCegarLoop]: Abstraction has 149 states and 213 transitions. [2020-08-21 20:31:36,306 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 20:31:36,306 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 213 transitions. [2020-08-21 20:31:36,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-21 20:31:36,307 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:36,307 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:36,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 20:31:36,307 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:36,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:36,308 INFO L82 PathProgramCache]: Analyzing trace with hash -472997077, now seen corresponding path program 1 times [2020-08-21 20:31:36,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:36,308 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2130890629] [2020-08-21 20:31:36,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:36,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:36,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:36,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:36,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2020-08-21 20:31:36,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,362 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2020-08-21 20:31:36,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77 [2020-08-21 20:31:36,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,371 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2020-08-21 20:31:36,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2130890629] [2020-08-21 20:31:36,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:31:36,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 20:31:36,372 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [752339186] [2020-08-21 20:31:36,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 20:31:36,373 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:36,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 20:31:36,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 20:31:36,373 INFO L87 Difference]: Start difference. First operand 149 states and 213 transitions. Second operand 4 states. [2020-08-21 20:31:36,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:36,395 INFO L93 Difference]: Finished difference Result 161 states and 227 transitions. [2020-08-21 20:31:36,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 20:31:36,396 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 91 [2020-08-21 20:31:36,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:36,397 INFO L225 Difference]: With dead ends: 161 [2020-08-21 20:31:36,397 INFO L226 Difference]: Without dead ends: 149 [2020-08-21 20:31:36,398 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:31:36,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2020-08-21 20:31:36,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2020-08-21 20:31:36,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2020-08-21 20:31:36,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 212 transitions. [2020-08-21 20:31:36,412 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 212 transitions. Word has length 91 [2020-08-21 20:31:36,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:36,412 INFO L479 AbstractCegarLoop]: Abstraction has 149 states and 212 transitions. [2020-08-21 20:31:36,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 20:31:36,413 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 212 transitions. [2020-08-21 20:31:36,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-21 20:31:36,414 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:36,414 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:36,414 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 20:31:36,414 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:36,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:36,415 INFO L82 PathProgramCache]: Analyzing trace with hash -1494065431, now seen corresponding path program 1 times [2020-08-21 20:31:36,415 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:36,415 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [51795404] [2020-08-21 20:31:36,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:36,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,460 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:36,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:36,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:36,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,779 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2020-08-21 20:31:36,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,782 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2020-08-21 20:31:36,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,785 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77 [2020-08-21 20:31:36,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:36,802 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 4 proven. 242 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:36,803 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [51795404] [2020-08-21 20:31:36,803 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:36,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 20:31:36,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180114943] [2020-08-21 20:31:36,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 20:31:36,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:36,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 20:31:36,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2020-08-21 20:31:36,805 INFO L87 Difference]: Start difference. First operand 149 states and 212 transitions. Second operand 17 states. [2020-08-21 20:31:37,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:37,325 INFO L93 Difference]: Finished difference Result 298 states and 427 transitions. [2020-08-21 20:31:37,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 20:31:37,326 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 91 [2020-08-21 20:31:37,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:37,328 INFO L225 Difference]: With dead ends: 298 [2020-08-21 20:31:37,328 INFO L226 Difference]: Without dead ends: 205 [2020-08-21 20:31:37,329 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2020-08-21 20:31:37,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2020-08-21 20:31:37,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 150. [2020-08-21 20:31:37,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-08-21 20:31:37,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 214 transitions. [2020-08-21 20:31:37,340 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 214 transitions. Word has length 91 [2020-08-21 20:31:37,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:37,341 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 214 transitions. [2020-08-21 20:31:37,341 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 20:31:37,341 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 214 transitions. [2020-08-21 20:31:37,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-21 20:31:37,342 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:37,342 INFO L422 BasicCegarLoop]: trace histogram [14, 13, 13, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:37,343 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 20:31:37,343 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:37,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:37,343 INFO L82 PathProgramCache]: Analyzing trace with hash -1215060069, now seen corresponding path program 1 times [2020-08-21 20:31:37,343 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:37,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1862287574] [2020-08-21 20:31:37,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:37,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:37,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:37,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:37,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:37,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:37,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:37,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:37,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2020-08-21 20:31:37,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:37,585 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 68 [2020-08-21 20:31:37,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:37,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 78 [2020-08-21 20:31:37,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:37,603 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 4 proven. 268 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:37,603 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1862287574] [2020-08-21 20:31:37,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:37,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 20:31:37,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391021289] [2020-08-21 20:31:37,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 20:31:37,604 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:37,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 20:31:37,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=137, Unknown=0, NotChecked=0, Total=272 [2020-08-21 20:31:37,605 INFO L87 Difference]: Start difference. First operand 150 states and 214 transitions. Second operand 17 states. [2020-08-21 20:31:37,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:37,814 INFO L93 Difference]: Finished difference Result 363 states and 494 transitions. [2020-08-21 20:31:37,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 20:31:37,814 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 92 [2020-08-21 20:31:37,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:37,816 INFO L225 Difference]: With dead ends: 363 [2020-08-21 20:31:37,816 INFO L226 Difference]: Without dead ends: 264 [2020-08-21 20:31:37,817 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=152, Invalid=154, Unknown=0, NotChecked=0, Total=306 [2020-08-21 20:31:37,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2020-08-21 20:31:37,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 155. [2020-08-21 20:31:37,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 155 states. [2020-08-21 20:31:37,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 221 transitions. [2020-08-21 20:31:37,831 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 221 transitions. Word has length 92 [2020-08-21 20:31:37,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:37,831 INFO L479 AbstractCegarLoop]: Abstraction has 155 states and 221 transitions. [2020-08-21 20:31:37,831 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 20:31:37,831 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 221 transitions. [2020-08-21 20:31:37,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-21 20:31:37,832 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:37,832 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:37,833 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 20:31:37,833 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:37,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:37,833 INFO L82 PathProgramCache]: Analyzing trace with hash 1005143610, now seen corresponding path program 2 times [2020-08-21 20:31:37,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:37,834 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [954402554] [2020-08-21 20:31:37,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:37,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:37,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:37,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:37,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:37,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:37,864 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:37,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:38,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2020-08-21 20:31:38,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:38,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 70 [2020-08-21 20:31:38,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:38,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 80 [2020-08-21 20:31:38,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:38,236 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 4 proven. 281 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:38,236 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [954402554] [2020-08-21 20:31:38,236 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:38,236 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 20:31:38,237 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292852747] [2020-08-21 20:31:38,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 20:31:38,237 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:38,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 20:31:38,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2020-08-21 20:31:38,238 INFO L87 Difference]: Start difference. First operand 155 states and 221 transitions. Second operand 18 states. [2020-08-21 20:31:38,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:38,908 INFO L93 Difference]: Finished difference Result 310 states and 445 transitions. [2020-08-21 20:31:38,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 20:31:38,909 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 94 [2020-08-21 20:31:38,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:38,911 INFO L225 Difference]: With dead ends: 310 [2020-08-21 20:31:38,911 INFO L226 Difference]: Without dead ends: 214 [2020-08-21 20:31:38,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=263, Unknown=0, NotChecked=0, Total=342 [2020-08-21 20:31:38,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2020-08-21 20:31:38,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 156. [2020-08-21 20:31:38,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-08-21 20:31:38,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 223 transitions. [2020-08-21 20:31:38,926 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 223 transitions. Word has length 94 [2020-08-21 20:31:38,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:38,926 INFO L479 AbstractCegarLoop]: Abstraction has 156 states and 223 transitions. [2020-08-21 20:31:38,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 20:31:38,926 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 223 transitions. [2020-08-21 20:31:38,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2020-08-21 20:31:38,928 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:38,928 INFO L422 BasicCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:38,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 20:31:38,928 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:38,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:38,929 INFO L82 PathProgramCache]: Analyzing trace with hash -1048991126, now seen corresponding path program 2 times [2020-08-21 20:31:38,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:38,929 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [721372832] [2020-08-21 20:31:38,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:38,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:38,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:38,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:38,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:38,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:38,960 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:38,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:39,206 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-08-21 20:31:39,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:39,209 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 71 [2020-08-21 20:31:39,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:39,211 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81 [2020-08-21 20:31:39,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:39,239 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 4 proven. 309 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:39,239 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [721372832] [2020-08-21 20:31:39,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:39,239 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 20:31:39,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216337936] [2020-08-21 20:31:39,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 20:31:39,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:39,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 20:31:39,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=154, Unknown=0, NotChecked=0, Total=306 [2020-08-21 20:31:39,241 INFO L87 Difference]: Start difference. First operand 156 states and 223 transitions. Second operand 18 states. [2020-08-21 20:31:39,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:39,476 INFO L93 Difference]: Finished difference Result 380 states and 517 transitions. [2020-08-21 20:31:39,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 20:31:39,476 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 95 [2020-08-21 20:31:39,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:39,479 INFO L225 Difference]: With dead ends: 380 [2020-08-21 20:31:39,479 INFO L226 Difference]: Without dead ends: 278 [2020-08-21 20:31:39,480 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=170, Invalid=172, Unknown=0, NotChecked=0, Total=342 [2020-08-21 20:31:39,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2020-08-21 20:31:39,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 161. [2020-08-21 20:31:39,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 161 states. [2020-08-21 20:31:39,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 230 transitions. [2020-08-21 20:31:39,498 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 230 transitions. Word has length 95 [2020-08-21 20:31:39,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:39,499 INFO L479 AbstractCegarLoop]: Abstraction has 161 states and 230 transitions. [2020-08-21 20:31:39,499 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 20:31:39,499 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 230 transitions. [2020-08-21 20:31:39,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-08-21 20:31:39,501 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:39,501 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:39,501 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 20:31:39,501 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:39,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:39,502 INFO L82 PathProgramCache]: Analyzing trace with hash 1683607881, now seen corresponding path program 3 times [2020-08-21 20:31:39,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:39,502 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [825892809] [2020-08-21 20:31:39,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:39,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:39,552 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:39,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:39,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:39,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:39,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:39,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:39,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 66 [2020-08-21 20:31:39,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:39,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73 [2020-08-21 20:31:39,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:39,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 83 [2020-08-21 20:31:39,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:39,954 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 4 proven. 323 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:39,955 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [825892809] [2020-08-21 20:31:39,955 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:39,955 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 20:31:39,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [791932637] [2020-08-21 20:31:39,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 20:31:39,956 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:39,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 20:31:39,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2020-08-21 20:31:39,956 INFO L87 Difference]: Start difference. First operand 161 states and 230 transitions. Second operand 19 states. [2020-08-21 20:31:40,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:40,660 INFO L93 Difference]: Finished difference Result 322 states and 463 transitions. [2020-08-21 20:31:40,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 20:31:40,660 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2020-08-21 20:31:40,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:40,662 INFO L225 Difference]: With dead ends: 322 [2020-08-21 20:31:40,662 INFO L226 Difference]: Without dead ends: 223 [2020-08-21 20:31:40,663 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2020-08-21 20:31:40,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2020-08-21 20:31:40,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 162. [2020-08-21 20:31:40,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2020-08-21 20:31:40,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 232 transitions. [2020-08-21 20:31:40,677 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 232 transitions. Word has length 97 [2020-08-21 20:31:40,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:40,678 INFO L479 AbstractCegarLoop]: Abstraction has 162 states and 232 transitions. [2020-08-21 20:31:40,678 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 20:31:40,678 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 232 transitions. [2020-08-21 20:31:40,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-21 20:31:40,680 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:40,680 INFO L422 BasicCegarLoop]: trace histogram [16, 15, 15, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:40,680 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 20:31:40,680 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:40,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:40,680 INFO L82 PathProgramCache]: Analyzing trace with hash -1491435205, now seen corresponding path program 3 times [2020-08-21 20:31:40,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:40,681 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1119074340] [2020-08-21 20:31:40,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:40,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:40,708 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:40,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:40,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:40,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:40,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:40,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:40,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2020-08-21 20:31:40,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:40,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74 [2020-08-21 20:31:40,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:40,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 84 [2020-08-21 20:31:40,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:41,002 INFO L134 CoverageAnalysis]: Checked inductivity of 375 backedges. 4 proven. 353 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:41,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1119074340] [2020-08-21 20:31:41,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:41,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 20:31:41,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178716235] [2020-08-21 20:31:41,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 20:31:41,003 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:41,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 20:31:41,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=172, Unknown=0, NotChecked=0, Total=342 [2020-08-21 20:31:41,004 INFO L87 Difference]: Start difference. First operand 162 states and 232 transitions. Second operand 19 states. [2020-08-21 20:31:41,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:41,262 INFO L93 Difference]: Finished difference Result 397 states and 540 transitions. [2020-08-21 20:31:41,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 20:31:41,264 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 98 [2020-08-21 20:31:41,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:41,267 INFO L225 Difference]: With dead ends: 397 [2020-08-21 20:31:41,267 INFO L226 Difference]: Without dead ends: 292 [2020-08-21 20:31:41,268 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=189, Invalid=191, Unknown=0, NotChecked=0, Total=380 [2020-08-21 20:31:41,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2020-08-21 20:31:41,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 167. [2020-08-21 20:31:41,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2020-08-21 20:31:41,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 239 transitions. [2020-08-21 20:31:41,290 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 239 transitions. Word has length 98 [2020-08-21 20:31:41,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:41,290 INFO L479 AbstractCegarLoop]: Abstraction has 167 states and 239 transitions. [2020-08-21 20:31:41,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 20:31:41,291 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 239 transitions. [2020-08-21 20:31:41,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-21 20:31:41,292 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:41,292 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:41,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 20:31:41,293 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:41,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:41,293 INFO L82 PathProgramCache]: Analyzing trace with hash 1696610266, now seen corresponding path program 4 times [2020-08-21 20:31:41,293 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:41,293 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [305864378] [2020-08-21 20:31:41,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:41,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:41,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:41,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:41,333 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:41,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:41,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:41,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:41,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69 [2020-08-21 20:31:41,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:41,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 76 [2020-08-21 20:31:41,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:41,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 86 [2020-08-21 20:31:41,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:41,827 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 4 proven. 368 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:41,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [305864378] [2020-08-21 20:31:41,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:41,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 20:31:41,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906264374] [2020-08-21 20:31:41,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 20:31:41,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:41,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 20:31:41,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2020-08-21 20:31:41,830 INFO L87 Difference]: Start difference. First operand 167 states and 239 transitions. Second operand 20 states. [2020-08-21 20:31:42,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:42,599 INFO L93 Difference]: Finished difference Result 334 states and 481 transitions. [2020-08-21 20:31:42,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 20:31:42,600 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 100 [2020-08-21 20:31:42,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:42,605 INFO L225 Difference]: With dead ends: 334 [2020-08-21 20:31:42,605 INFO L226 Difference]: Without dead ends: 232 [2020-08-21 20:31:42,606 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-08-21 20:31:42,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2020-08-21 20:31:42,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 168. [2020-08-21 20:31:42,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2020-08-21 20:31:42,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 241 transitions. [2020-08-21 20:31:42,630 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 241 transitions. Word has length 100 [2020-08-21 20:31:42,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:42,630 INFO L479 AbstractCegarLoop]: Abstraction has 168 states and 241 transitions. [2020-08-21 20:31:42,631 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 20:31:42,631 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 241 transitions. [2020-08-21 20:31:42,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2020-08-21 20:31:42,632 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:42,632 INFO L422 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:42,632 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 20:31:42,633 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:42,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:42,633 INFO L82 PathProgramCache]: Analyzing trace with hash -1088361270, now seen corresponding path program 4 times [2020-08-21 20:31:42,633 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:42,633 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [180392833] [2020-08-21 20:31:42,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:42,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:42,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:42,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:42,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:42,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:42,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:42,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:42,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 70 [2020-08-21 20:31:42,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:42,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77 [2020-08-21 20:31:42,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:42,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 87 [2020-08-21 20:31:42,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:42,975 INFO L134 CoverageAnalysis]: Checked inductivity of 422 backedges. 4 proven. 400 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:42,976 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [180392833] [2020-08-21 20:31:42,976 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:42,976 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 20:31:42,976 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345223626] [2020-08-21 20:31:42,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 20:31:42,977 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:42,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 20:31:42,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=191, Unknown=0, NotChecked=0, Total=380 [2020-08-21 20:31:42,978 INFO L87 Difference]: Start difference. First operand 168 states and 241 transitions. Second operand 20 states. [2020-08-21 20:31:43,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:43,272 INFO L93 Difference]: Finished difference Result 414 states and 563 transitions. [2020-08-21 20:31:43,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 20:31:43,273 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 101 [2020-08-21 20:31:43,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:43,275 INFO L225 Difference]: With dead ends: 414 [2020-08-21 20:31:43,275 INFO L226 Difference]: Without dead ends: 306 [2020-08-21 20:31:43,278 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=209, Invalid=211, Unknown=0, NotChecked=0, Total=420 [2020-08-21 20:31:43,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2020-08-21 20:31:43,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 173. [2020-08-21 20:31:43,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-08-21 20:31:43,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 248 transitions. [2020-08-21 20:31:43,293 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 248 transitions. Word has length 101 [2020-08-21 20:31:43,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:43,293 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 248 transitions. [2020-08-21 20:31:43,293 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 20:31:43,293 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 248 transitions. [2020-08-21 20:31:43,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-08-21 20:31:43,295 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:43,295 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:43,295 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 20:31:43,295 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:43,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:43,295 INFO L82 PathProgramCache]: Analyzing trace with hash -1791362135, now seen corresponding path program 5 times [2020-08-21 20:31:43,296 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:43,296 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [888225750] [2020-08-21 20:31:43,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:43,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:43,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:43,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:43,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:43,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:43,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:43,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:43,764 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 72 [2020-08-21 20:31:43,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:43,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 79 [2020-08-21 20:31:43,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:43,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 89 [2020-08-21 20:31:43,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:43,795 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 4 proven. 416 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:43,795 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [888225750] [2020-08-21 20:31:43,795 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:43,795 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 20:31:43,796 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864954145] [2020-08-21 20:31:43,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 20:31:43,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:43,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 20:31:43,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2020-08-21 20:31:43,799 INFO L87 Difference]: Start difference. First operand 173 states and 248 transitions. Second operand 21 states. [2020-08-21 20:31:44,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:44,582 INFO L93 Difference]: Finished difference Result 346 states and 499 transitions. [2020-08-21 20:31:44,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 20:31:44,588 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 103 [2020-08-21 20:31:44,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:44,590 INFO L225 Difference]: With dead ends: 346 [2020-08-21 20:31:44,590 INFO L226 Difference]: Without dead ends: 241 [2020-08-21 20:31:44,591 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2020-08-21 20:31:44,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2020-08-21 20:31:44,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 174. [2020-08-21 20:31:44,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-08-21 20:31:44,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 250 transitions. [2020-08-21 20:31:44,606 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 250 transitions. Word has length 103 [2020-08-21 20:31:44,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:44,606 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 250 transitions. [2020-08-21 20:31:44,607 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 20:31:44,607 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 250 transitions. [2020-08-21 20:31:44,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-21 20:31:44,608 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:44,608 INFO L422 BasicCegarLoop]: trace histogram [18, 17, 17, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:44,608 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 20:31:44,609 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:44,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:44,609 INFO L82 PathProgramCache]: Analyzing trace with hash -1841323301, now seen corresponding path program 5 times [2020-08-21 20:31:44,609 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:44,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [146395162] [2020-08-21 20:31:44,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:44,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:44,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:44,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:44,638 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:44,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:44,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:44,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:44,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73 [2020-08-21 20:31:44,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:44,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 80 [2020-08-21 20:31:44,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:44,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 90 [2020-08-21 20:31:44,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:45,027 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 4 proven. 450 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:45,027 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [146395162] [2020-08-21 20:31:45,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:45,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 20:31:45,028 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481492416] [2020-08-21 20:31:45,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 20:31:45,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:45,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 20:31:45,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=211, Unknown=0, NotChecked=0, Total=420 [2020-08-21 20:31:45,029 INFO L87 Difference]: Start difference. First operand 174 states and 250 transitions. Second operand 21 states. [2020-08-21 20:31:45,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:45,314 INFO L93 Difference]: Finished difference Result 431 states and 586 transitions. [2020-08-21 20:31:45,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 20:31:45,315 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 104 [2020-08-21 20:31:45,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:45,317 INFO L225 Difference]: With dead ends: 431 [2020-08-21 20:31:45,317 INFO L226 Difference]: Without dead ends: 320 [2020-08-21 20:31:45,318 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=230, Invalid=232, Unknown=0, NotChecked=0, Total=462 [2020-08-21 20:31:45,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2020-08-21 20:31:45,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 179. [2020-08-21 20:31:45,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2020-08-21 20:31:45,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 257 transitions. [2020-08-21 20:31:45,334 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 257 transitions. Word has length 104 [2020-08-21 20:31:45,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:45,334 INFO L479 AbstractCegarLoop]: Abstraction has 179 states and 257 transitions. [2020-08-21 20:31:45,335 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 20:31:45,335 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 257 transitions. [2020-08-21 20:31:45,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-08-21 20:31:45,336 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:45,336 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:45,336 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 20:31:45,337 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:45,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:45,337 INFO L82 PathProgramCache]: Analyzing trace with hash 461599098, now seen corresponding path program 6 times [2020-08-21 20:31:45,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:45,337 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1715587695] [2020-08-21 20:31:45,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:45,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:45,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:45,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:45,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:45,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:45,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:45,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:45,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 75 [2020-08-21 20:31:45,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:45,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2020-08-21 20:31:45,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:45,855 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 92 [2020-08-21 20:31:45,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:45,875 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 4 proven. 467 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:45,876 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1715587695] [2020-08-21 20:31:45,876 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:45,876 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 20:31:45,876 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941946183] [2020-08-21 20:31:45,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 20:31:45,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:45,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 20:31:45,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2020-08-21 20:31:45,877 INFO L87 Difference]: Start difference. First operand 179 states and 257 transitions. Second operand 22 states. [2020-08-21 20:31:46,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:46,753 INFO L93 Difference]: Finished difference Result 358 states and 517 transitions. [2020-08-21 20:31:46,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 20:31:46,758 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 106 [2020-08-21 20:31:46,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:46,760 INFO L225 Difference]: With dead ends: 358 [2020-08-21 20:31:46,760 INFO L226 Difference]: Without dead ends: 250 [2020-08-21 20:31:46,762 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=99, Invalid=407, Unknown=0, NotChecked=0, Total=506 [2020-08-21 20:31:46,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-08-21 20:31:46,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 180. [2020-08-21 20:31:46,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2020-08-21 20:31:46,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 259 transitions. [2020-08-21 20:31:46,781 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 259 transitions. Word has length 106 [2020-08-21 20:31:46,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:46,781 INFO L479 AbstractCegarLoop]: Abstraction has 180 states and 259 transitions. [2020-08-21 20:31:46,781 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 20:31:46,781 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 259 transitions. [2020-08-21 20:31:46,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-08-21 20:31:46,782 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:46,782 INFO L422 BasicCegarLoop]: trace histogram [19, 18, 18, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:46,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 20:31:46,783 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:46,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:46,783 INFO L82 PathProgramCache]: Analyzing trace with hash -719001814, now seen corresponding path program 6 times [2020-08-21 20:31:46,783 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:46,783 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2045626626] [2020-08-21 20:31:46,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:46,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:46,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:46,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:46,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:46,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:46,814 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:46,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:47,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 76 [2020-08-21 20:31:47,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:47,177 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 83 [2020-08-21 20:31:47,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:47,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:31:47,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:47,201 INFO L134 CoverageAnalysis]: Checked inductivity of 525 backedges. 4 proven. 503 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:47,201 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2045626626] [2020-08-21 20:31:47,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:47,202 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 20:31:47,202 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224719265] [2020-08-21 20:31:47,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 20:31:47,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:47,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 20:31:47,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=232, Unknown=0, NotChecked=0, Total=462 [2020-08-21 20:31:47,203 INFO L87 Difference]: Start difference. First operand 180 states and 259 transitions. Second operand 22 states. [2020-08-21 20:31:47,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:47,446 INFO L93 Difference]: Finished difference Result 448 states and 609 transitions. [2020-08-21 20:31:47,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 20:31:47,449 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 107 [2020-08-21 20:31:47,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:47,451 INFO L225 Difference]: With dead ends: 448 [2020-08-21 20:31:47,451 INFO L226 Difference]: Without dead ends: 334 [2020-08-21 20:31:47,452 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=252, Invalid=254, Unknown=0, NotChecked=0, Total=506 [2020-08-21 20:31:47,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2020-08-21 20:31:47,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 185. [2020-08-21 20:31:47,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 185 states. [2020-08-21 20:31:47,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 266 transitions. [2020-08-21 20:31:47,468 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 266 transitions. Word has length 107 [2020-08-21 20:31:47,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:47,468 INFO L479 AbstractCegarLoop]: Abstraction has 185 states and 266 transitions. [2020-08-21 20:31:47,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 20:31:47,469 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 266 transitions. [2020-08-21 20:31:47,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-08-21 20:31:47,470 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:47,470 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:47,470 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 20:31:47,470 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:47,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:47,471 INFO L82 PathProgramCache]: Analyzing trace with hash 975756809, now seen corresponding path program 7 times [2020-08-21 20:31:47,471 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:47,471 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [509605628] [2020-08-21 20:31:47,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:47,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:47,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:47,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:47,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:47,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:47,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:47,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:48,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 78 [2020-08-21 20:31:48,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:48,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 85 [2020-08-21 20:31:48,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:48,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 95 [2020-08-21 20:31:48,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:48,046 INFO L134 CoverageAnalysis]: Checked inductivity of 543 backedges. 4 proven. 521 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:48,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [509605628] [2020-08-21 20:31:48,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:48,047 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 20:31:48,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757023607] [2020-08-21 20:31:48,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 20:31:48,048 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:48,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 20:31:48,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2020-08-21 20:31:48,049 INFO L87 Difference]: Start difference. First operand 185 states and 266 transitions. Second operand 23 states. [2020-08-21 20:31:48,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:48,995 INFO L93 Difference]: Finished difference Result 370 states and 535 transitions. [2020-08-21 20:31:48,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 20:31:48,996 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 109 [2020-08-21 20:31:48,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:49,000 INFO L225 Difference]: With dead ends: 370 [2020-08-21 20:31:49,000 INFO L226 Difference]: Without dead ends: 259 [2020-08-21 20:31:49,001 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=448, Unknown=0, NotChecked=0, Total=552 [2020-08-21 20:31:49,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2020-08-21 20:31:49,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 186. [2020-08-21 20:31:49,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2020-08-21 20:31:49,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 268 transitions. [2020-08-21 20:31:49,034 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 268 transitions. Word has length 109 [2020-08-21 20:31:49,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:49,034 INFO L479 AbstractCegarLoop]: Abstraction has 186 states and 268 transitions. [2020-08-21 20:31:49,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 20:31:49,035 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 268 transitions. [2020-08-21 20:31:49,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-08-21 20:31:49,036 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:49,037 INFO L422 BasicCegarLoop]: trace histogram [20, 19, 19, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:49,037 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 20:31:49,037 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:49,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:49,038 INFO L82 PathProgramCache]: Analyzing trace with hash -1959981957, now seen corresponding path program 7 times [2020-08-21 20:31:49,038 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:49,038 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [139845761] [2020-08-21 20:31:49,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:49,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:49,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:49,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:49,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:49,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:49,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:49,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:49,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 79 [2020-08-21 20:31:49,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:49,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 86 [2020-08-21 20:31:49,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:49,456 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 96 [2020-08-21 20:31:49,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:49,474 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 4 proven. 559 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:49,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [139845761] [2020-08-21 20:31:49,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:49,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 20:31:49,475 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705803219] [2020-08-21 20:31:49,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 20:31:49,475 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:49,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 20:31:49,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=252, Invalid=254, Unknown=0, NotChecked=0, Total=506 [2020-08-21 20:31:49,476 INFO L87 Difference]: Start difference. First operand 186 states and 268 transitions. Second operand 23 states. [2020-08-21 20:31:49,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:49,800 INFO L93 Difference]: Finished difference Result 465 states and 632 transitions. [2020-08-21 20:31:49,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 20:31:49,801 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 110 [2020-08-21 20:31:49,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:49,803 INFO L225 Difference]: With dead ends: 465 [2020-08-21 20:31:49,803 INFO L226 Difference]: Without dead ends: 348 [2020-08-21 20:31:49,804 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=275, Invalid=277, Unknown=0, NotChecked=0, Total=552 [2020-08-21 20:31:49,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2020-08-21 20:31:49,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 191. [2020-08-21 20:31:49,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 191 states. [2020-08-21 20:31:49,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 275 transitions. [2020-08-21 20:31:49,820 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 275 transitions. Word has length 110 [2020-08-21 20:31:49,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:49,821 INFO L479 AbstractCegarLoop]: Abstraction has 191 states and 275 transitions. [2020-08-21 20:31:49,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 20:31:49,821 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 275 transitions. [2020-08-21 20:31:49,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2020-08-21 20:31:49,822 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:49,822 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:49,823 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 20:31:49,823 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:49,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:49,823 INFO L82 PathProgramCache]: Analyzing trace with hash -1900219622, now seen corresponding path program 8 times [2020-08-21 20:31:49,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:49,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1590627967] [2020-08-21 20:31:49,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:49,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:49,871 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:49,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:49,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:49,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:49,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:49,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:50,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81 [2020-08-21 20:31:50,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:50,579 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 88 [2020-08-21 20:31:50,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:50,582 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 98 [2020-08-21 20:31:50,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:50,618 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 4 proven. 578 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:50,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1590627967] [2020-08-21 20:31:50,620 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:50,620 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 20:31:50,620 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099293970] [2020-08-21 20:31:50,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 20:31:50,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:50,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 20:31:50,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2020-08-21 20:31:50,623 INFO L87 Difference]: Start difference. First operand 191 states and 275 transitions. Second operand 24 states. [2020-08-21 20:31:51,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:51,734 INFO L93 Difference]: Finished difference Result 382 states and 553 transitions. [2020-08-21 20:31:51,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 20:31:51,735 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 112 [2020-08-21 20:31:51,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:51,737 INFO L225 Difference]: With dead ends: 382 [2020-08-21 20:31:51,737 INFO L226 Difference]: Without dead ends: 268 [2020-08-21 20:31:51,738 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=109, Invalid=491, Unknown=0, NotChecked=0, Total=600 [2020-08-21 20:31:51,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2020-08-21 20:31:51,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 192. [2020-08-21 20:31:51,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-08-21 20:31:51,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 277 transitions. [2020-08-21 20:31:51,755 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 277 transitions. Word has length 112 [2020-08-21 20:31:51,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:51,756 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 277 transitions. [2020-08-21 20:31:51,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 20:31:51,756 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 277 transitions. [2020-08-21 20:31:51,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2020-08-21 20:31:51,757 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:51,757 INFO L422 BasicCegarLoop]: trace histogram [21, 20, 20, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:51,757 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 20:31:51,758 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:51,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:51,758 INFO L82 PathProgramCache]: Analyzing trace with hash -920938102, now seen corresponding path program 8 times [2020-08-21 20:31:51,758 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:51,758 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1514063299] [2020-08-21 20:31:51,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:51,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:51,788 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:51,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:51,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:51,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:51,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:51,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:52,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2020-08-21 20:31:52,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:52,189 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 89 [2020-08-21 20:31:52,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:52,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 99 [2020-08-21 20:31:52,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:52,214 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 4 proven. 618 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:52,214 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1514063299] [2020-08-21 20:31:52,214 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:52,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 20:31:52,215 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982617791] [2020-08-21 20:31:52,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 20:31:52,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:52,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 20:31:52,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=277, Unknown=0, NotChecked=0, Total=552 [2020-08-21 20:31:52,216 INFO L87 Difference]: Start difference. First operand 192 states and 277 transitions. Second operand 24 states. [2020-08-21 20:31:52,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:52,549 INFO L93 Difference]: Finished difference Result 482 states and 655 transitions. [2020-08-21 20:31:52,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 20:31:52,551 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 113 [2020-08-21 20:31:52,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:52,553 INFO L225 Difference]: With dead ends: 482 [2020-08-21 20:31:52,553 INFO L226 Difference]: Without dead ends: 362 [2020-08-21 20:31:52,554 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=299, Invalid=301, Unknown=0, NotChecked=0, Total=600 [2020-08-21 20:31:52,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2020-08-21 20:31:52,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 197. [2020-08-21 20:31:52,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2020-08-21 20:31:52,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 284 transitions. [2020-08-21 20:31:52,579 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 284 transitions. Word has length 113 [2020-08-21 20:31:52,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:52,579 INFO L479 AbstractCegarLoop]: Abstraction has 197 states and 284 transitions. [2020-08-21 20:31:52,579 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 20:31:52,579 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 284 transitions. [2020-08-21 20:31:52,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2020-08-21 20:31:52,580 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:52,580 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:52,581 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-21 20:31:52,581 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:52,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:52,581 INFO L82 PathProgramCache]: Analyzing trace with hash 188512361, now seen corresponding path program 9 times [2020-08-21 20:31:52,581 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:52,581 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [223211800] [2020-08-21 20:31:52,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:52,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:52,619 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:52,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:52,620 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:52,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:52,622 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:52,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:53,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 84 [2020-08-21 20:31:53,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:53,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 91 [2020-08-21 20:31:53,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:53,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 101 [2020-08-21 20:31:53,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:53,219 INFO L134 CoverageAnalysis]: Checked inductivity of 660 backedges. 4 proven. 638 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:53,219 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [223211800] [2020-08-21 20:31:53,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:53,219 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 20:31:53,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597467317] [2020-08-21 20:31:53,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 20:31:53,220 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:53,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 20:31:53,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=511, Unknown=0, NotChecked=0, Total=600 [2020-08-21 20:31:53,221 INFO L87 Difference]: Start difference. First operand 197 states and 284 transitions. Second operand 25 states. [2020-08-21 20:31:54,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:54,441 INFO L93 Difference]: Finished difference Result 394 states and 571 transitions. [2020-08-21 20:31:54,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 20:31:54,443 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 115 [2020-08-21 20:31:54,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:54,445 INFO L225 Difference]: With dead ends: 394 [2020-08-21 20:31:54,445 INFO L226 Difference]: Without dead ends: 277 [2020-08-21 20:31:54,448 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=114, Invalid=536, Unknown=0, NotChecked=0, Total=650 [2020-08-21 20:31:54,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2020-08-21 20:31:54,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 198. [2020-08-21 20:31:54,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2020-08-21 20:31:54,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 286 transitions. [2020-08-21 20:31:54,470 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 286 transitions. Word has length 115 [2020-08-21 20:31:54,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:54,470 INFO L479 AbstractCegarLoop]: Abstraction has 198 states and 286 transitions. [2020-08-21 20:31:54,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 20:31:54,470 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 286 transitions. [2020-08-21 20:31:54,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2020-08-21 20:31:54,471 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:54,471 INFO L422 BasicCegarLoop]: trace histogram [22, 21, 21, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:54,471 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-21 20:31:54,471 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:54,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:54,472 INFO L82 PathProgramCache]: Analyzing trace with hash -594756069, now seen corresponding path program 9 times [2020-08-21 20:31:54,472 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:54,472 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [445210642] [2020-08-21 20:31:54,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:54,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:54,500 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:54,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:54,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:54,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:54,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:54,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:54,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 85 [2020-08-21 20:31:54,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:54,939 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 92 [2020-08-21 20:31:54,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:54,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 102 [2020-08-21 20:31:54,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:54,959 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 4 proven. 680 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:54,959 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [445210642] [2020-08-21 20:31:54,959 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:54,959 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 20:31:54,960 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954656916] [2020-08-21 20:31:54,960 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 20:31:54,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:54,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 20:31:54,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=299, Invalid=301, Unknown=0, NotChecked=0, Total=600 [2020-08-21 20:31:54,961 INFO L87 Difference]: Start difference. First operand 198 states and 286 transitions. Second operand 25 states. [2020-08-21 20:31:55,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:55,300 INFO L93 Difference]: Finished difference Result 499 states and 678 transitions. [2020-08-21 20:31:55,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 20:31:55,301 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 116 [2020-08-21 20:31:55,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:55,303 INFO L225 Difference]: With dead ends: 499 [2020-08-21 20:31:55,303 INFO L226 Difference]: Without dead ends: 376 [2020-08-21 20:31:55,304 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=324, Invalid=326, Unknown=0, NotChecked=0, Total=650 [2020-08-21 20:31:55,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2020-08-21 20:31:55,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 203. [2020-08-21 20:31:55,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 203 states. [2020-08-21 20:31:55,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 293 transitions. [2020-08-21 20:31:55,323 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 293 transitions. Word has length 116 [2020-08-21 20:31:55,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:55,324 INFO L479 AbstractCegarLoop]: Abstraction has 203 states and 293 transitions. [2020-08-21 20:31:55,324 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 20:31:55,324 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 293 transitions. [2020-08-21 20:31:55,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-08-21 20:31:55,325 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:55,325 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:55,325 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-21 20:31:55,326 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:55,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:55,326 INFO L82 PathProgramCache]: Analyzing trace with hash 116833466, now seen corresponding path program 10 times [2020-08-21 20:31:55,326 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:55,326 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1326811754] [2020-08-21 20:31:55,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:55,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:55,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:55,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:55,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:55,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:55,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:55,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:55,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 87 [2020-08-21 20:31:55,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:55,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 94 [2020-08-21 20:31:55,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:55,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 104 [2020-08-21 20:31:55,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:56,009 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 4 proven. 701 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:56,010 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1326811754] [2020-08-21 20:31:56,010 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:56,010 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 20:31:56,010 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43273069] [2020-08-21 20:31:56,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 20:31:56,010 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:56,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 20:31:56,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2020-08-21 20:31:56,011 INFO L87 Difference]: Start difference. First operand 203 states and 293 transitions. Second operand 26 states. [2020-08-21 20:31:57,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:57,324 INFO L93 Difference]: Finished difference Result 406 states and 589 transitions. [2020-08-21 20:31:57,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 20:31:57,325 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 118 [2020-08-21 20:31:57,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:57,327 INFO L225 Difference]: With dead ends: 406 [2020-08-21 20:31:57,327 INFO L226 Difference]: Without dead ends: 286 [2020-08-21 20:31:57,328 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=119, Invalid=583, Unknown=0, NotChecked=0, Total=702 [2020-08-21 20:31:57,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2020-08-21 20:31:57,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 204. [2020-08-21 20:31:57,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-08-21 20:31:57,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 295 transitions. [2020-08-21 20:31:57,347 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 295 transitions. Word has length 118 [2020-08-21 20:31:57,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:57,347 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 295 transitions. [2020-08-21 20:31:57,347 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 20:31:57,348 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 295 transitions. [2020-08-21 20:31:57,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2020-08-21 20:31:57,349 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:57,349 INFO L422 BasicCegarLoop]: trace histogram [23, 22, 22, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:57,349 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-21 20:31:57,349 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:57,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:57,350 INFO L82 PathProgramCache]: Analyzing trace with hash 1478165482, now seen corresponding path program 10 times [2020-08-21 20:31:57,350 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:57,350 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [421581367] [2020-08-21 20:31:57,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:57,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:57,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:57,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:57,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:57,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:57,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:57,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:57,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 88 [2020-08-21 20:31:57,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:57,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 95 [2020-08-21 20:31:57,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:57,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 105 [2020-08-21 20:31:57,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:57,965 INFO L134 CoverageAnalysis]: Checked inductivity of 767 backedges. 4 proven. 745 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:57,965 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [421581367] [2020-08-21 20:31:57,965 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:57,966 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 20:31:57,966 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [937700726] [2020-08-21 20:31:57,966 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 20:31:57,966 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:57,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 20:31:57,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=326, Unknown=0, NotChecked=0, Total=650 [2020-08-21 20:31:57,967 INFO L87 Difference]: Start difference. First operand 204 states and 295 transitions. Second operand 26 states. [2020-08-21 20:31:58,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:31:58,292 INFO L93 Difference]: Finished difference Result 516 states and 701 transitions. [2020-08-21 20:31:58,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 20:31:58,293 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 119 [2020-08-21 20:31:58,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:31:58,296 INFO L225 Difference]: With dead ends: 516 [2020-08-21 20:31:58,296 INFO L226 Difference]: Without dead ends: 390 [2020-08-21 20:31:58,297 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=350, Invalid=352, Unknown=0, NotChecked=0, Total=702 [2020-08-21 20:31:58,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390 states. [2020-08-21 20:31:58,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390 to 209. [2020-08-21 20:31:58,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 209 states. [2020-08-21 20:31:58,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 302 transitions. [2020-08-21 20:31:58,318 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 302 transitions. Word has length 119 [2020-08-21 20:31:58,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:31:58,318 INFO L479 AbstractCegarLoop]: Abstraction has 209 states and 302 transitions. [2020-08-21 20:31:58,318 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 20:31:58,318 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 302 transitions. [2020-08-21 20:31:58,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-08-21 20:31:58,320 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:31:58,320 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:31:58,320 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-21 20:31:58,320 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:31:58,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:31:58,321 INFO L82 PathProgramCache]: Analyzing trace with hash -670381367, now seen corresponding path program 11 times [2020-08-21 20:31:58,321 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:31:58,321 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1955202042] [2020-08-21 20:31:58,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:31:58,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:58,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:31:58,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:58,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:31:58,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:58,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:31:58,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:59,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 90 [2020-08-21 20:31:59,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:59,053 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 97 [2020-08-21 20:31:59,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:59,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 107 [2020-08-21 20:31:59,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:31:59,086 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 4 proven. 767 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:31:59,087 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1955202042] [2020-08-21 20:31:59,087 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:31:59,087 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 20:31:59,087 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355213424] [2020-08-21 20:31:59,088 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 20:31:59,088 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:31:59,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 20:31:59,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=605, Unknown=0, NotChecked=0, Total=702 [2020-08-21 20:31:59,089 INFO L87 Difference]: Start difference. First operand 209 states and 302 transitions. Second operand 27 states. [2020-08-21 20:32:00,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:00,505 INFO L93 Difference]: Finished difference Result 418 states and 607 transitions. [2020-08-21 20:32:00,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 20:32:00,506 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 121 [2020-08-21 20:32:00,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:00,508 INFO L225 Difference]: With dead ends: 418 [2020-08-21 20:32:00,508 INFO L226 Difference]: Without dead ends: 295 [2020-08-21 20:32:00,510 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=124, Invalid=632, Unknown=0, NotChecked=0, Total=756 [2020-08-21 20:32:00,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2020-08-21 20:32:00,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 210. [2020-08-21 20:32:00,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2020-08-21 20:32:00,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 304 transitions. [2020-08-21 20:32:00,529 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 304 transitions. Word has length 121 [2020-08-21 20:32:00,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:00,529 INFO L479 AbstractCegarLoop]: Abstraction has 210 states and 304 transitions. [2020-08-21 20:32:00,529 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 20:32:00,529 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 304 transitions. [2020-08-21 20:32:00,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-08-21 20:32:00,531 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:00,531 INFO L422 BasicCegarLoop]: trace histogram [24, 23, 23, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:00,531 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-08-21 20:32:00,531 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:00,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:00,531 INFO L82 PathProgramCache]: Analyzing trace with hash -1450657861, now seen corresponding path program 11 times [2020-08-21 20:32:00,532 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:00,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1884924604] [2020-08-21 20:32:00,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:00,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:00,575 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:00,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:00,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:00,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:00,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:00,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:01,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 91 [2020-08-21 20:32:01,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:01,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 98 [2020-08-21 20:32:01,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:01,103 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 108 [2020-08-21 20:32:01,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:01,128 INFO L134 CoverageAnalysis]: Checked inductivity of 835 backedges. 4 proven. 813 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-08-21 20:32:01,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1884924604] [2020-08-21 20:32:01,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:32:01,129 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 20:32:01,129 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103115236] [2020-08-21 20:32:01,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 20:32:01,130 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:01,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 20:32:01,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=350, Invalid=352, Unknown=0, NotChecked=0, Total=702 [2020-08-21 20:32:01,130 INFO L87 Difference]: Start difference. First operand 210 states and 304 transitions. Second operand 27 states. [2020-08-21 20:32:01,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:01,573 INFO L93 Difference]: Finished difference Result 533 states and 724 transitions. [2020-08-21 20:32:01,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 20:32:01,573 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 122 [2020-08-21 20:32:01,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:01,575 INFO L225 Difference]: With dead ends: 533 [2020-08-21 20:32:01,576 INFO L226 Difference]: Without dead ends: 404 [2020-08-21 20:32:01,577 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=377, Invalid=379, Unknown=0, NotChecked=0, Total=756 [2020-08-21 20:32:01,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2020-08-21 20:32:01,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 215. [2020-08-21 20:32:01,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2020-08-21 20:32:01,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 311 transitions. [2020-08-21 20:32:01,598 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 311 transitions. Word has length 122 [2020-08-21 20:32:01,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:01,598 INFO L479 AbstractCegarLoop]: Abstraction has 215 states and 311 transitions. [2020-08-21 20:32:01,599 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 20:32:01,599 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 311 transitions. [2020-08-21 20:32:01,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-08-21 20:32:01,600 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:01,600 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:01,600 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-08-21 20:32:01,600 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:01,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:01,601 INFO L82 PathProgramCache]: Analyzing trace with hash -2066035110, now seen corresponding path program 12 times [2020-08-21 20:32:01,601 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:01,601 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [298423150] [2020-08-21 20:32:01,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:01,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:01,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:01,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:01,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:01,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:01,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:01,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:01,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:01,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:01,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 100 [2020-08-21 20:32:01,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:01,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 110 [2020-08-21 20:32:01,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:01,780 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 846 trivial. 0 not checked. [2020-08-21 20:32:01,781 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [298423150] [2020-08-21 20:32:01,781 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:32:01,781 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-08-21 20:32:01,781 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249100068] [2020-08-21 20:32:01,782 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 20:32:01,782 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:01,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 20:32:01,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:32:01,782 INFO L87 Difference]: Start difference. First operand 215 states and 311 transitions. Second operand 10 states. [2020-08-21 20:32:02,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:02,017 INFO L93 Difference]: Finished difference Result 271 states and 393 transitions. [2020-08-21 20:32:02,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:32:02,018 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 124 [2020-08-21 20:32:02,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:02,020 INFO L225 Difference]: With dead ends: 271 [2020-08-21 20:32:02,020 INFO L226 Difference]: Without dead ends: 261 [2020-08-21 20:32:02,021 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:32:02,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2020-08-21 20:32:02,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 241. [2020-08-21 20:32:02,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241 states. [2020-08-21 20:32:02,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 355 transitions. [2020-08-21 20:32:02,049 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 355 transitions. Word has length 124 [2020-08-21 20:32:02,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:02,049 INFO L479 AbstractCegarLoop]: Abstraction has 241 states and 355 transitions. [2020-08-21 20:32:02,050 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 20:32:02,050 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 355 transitions. [2020-08-21 20:32:02,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-08-21 20:32:02,051 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:02,051 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:02,052 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-08-21 20:32:02,052 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:02,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:02,052 INFO L82 PathProgramCache]: Analyzing trace with hash -1807869672, now seen corresponding path program 1 times [2020-08-21 20:32:02,052 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:02,052 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [908225854] [2020-08-21 20:32:02,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:02,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:02,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,172 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:02,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:02,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,231 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:02,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 100 [2020-08-21 20:32:02,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 110 [2020-08-21 20:32:02,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,279 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 849 trivial. 0 not checked. [2020-08-21 20:32:02,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [908225854] [2020-08-21 20:32:02,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:32:02,280 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 20:32:02,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845638746] [2020-08-21 20:32:02,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 20:32:02,280 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:02,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 20:32:02,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:32:02,281 INFO L87 Difference]: Start difference. First operand 241 states and 355 transitions. Second operand 10 states. [2020-08-21 20:32:02,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:02,506 INFO L93 Difference]: Finished difference Result 285 states and 429 transitions. [2020-08-21 20:32:02,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:32:02,507 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 124 [2020-08-21 20:32:02,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:02,510 INFO L225 Difference]: With dead ends: 285 [2020-08-21 20:32:02,511 INFO L226 Difference]: Without dead ends: 280 [2020-08-21 20:32:02,511 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:32:02,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2020-08-21 20:32:02,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 265. [2020-08-21 20:32:02,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 265 states. [2020-08-21 20:32:02,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 402 transitions. [2020-08-21 20:32:02,547 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 402 transitions. Word has length 124 [2020-08-21 20:32:02,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:02,548 INFO L479 AbstractCegarLoop]: Abstraction has 265 states and 402 transitions. [2020-08-21 20:32:02,548 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 20:32:02,548 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 402 transitions. [2020-08-21 20:32:02,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-21 20:32:02,555 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:02,555 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:02,555 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-08-21 20:32:02,555 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:02,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:02,556 INFO L82 PathProgramCache]: Analyzing trace with hash 1864277052, now seen corresponding path program 1 times [2020-08-21 20:32:02,556 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:02,556 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [312130670] [2020-08-21 20:32:02,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:02,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:02,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:02,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,635 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:02,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:02,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 100 [2020-08-21 20:32:02,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 110 [2020-08-21 20:32:02,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,664 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 858 trivial. 0 not checked. [2020-08-21 20:32:02,664 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [312130670] [2020-08-21 20:32:02,664 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:32:02,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-21 20:32:02,665 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901785432] [2020-08-21 20:32:02,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 20:32:02,665 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:02,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 20:32:02,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:32:02,666 INFO L87 Difference]: Start difference. First operand 265 states and 402 transitions. Second operand 6 states. [2020-08-21 20:32:02,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:02,725 INFO L93 Difference]: Finished difference Result 271 states and 407 transitions. [2020-08-21 20:32:02,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 20:32:02,726 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 126 [2020-08-21 20:32:02,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:02,728 INFO L225 Difference]: With dead ends: 271 [2020-08-21 20:32:02,728 INFO L226 Difference]: Without dead ends: 265 [2020-08-21 20:32:02,728 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:32:02,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2020-08-21 20:32:02,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 265. [2020-08-21 20:32:02,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 265 states. [2020-08-21 20:32:02,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 401 transitions. [2020-08-21 20:32:02,760 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 401 transitions. Word has length 126 [2020-08-21 20:32:02,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:02,760 INFO L479 AbstractCegarLoop]: Abstraction has 265 states and 401 transitions. [2020-08-21 20:32:02,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 20:32:02,760 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 401 transitions. [2020-08-21 20:32:02,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-21 20:32:02,763 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:02,763 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:02,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-08-21 20:32:02,764 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:02,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:02,764 INFO L82 PathProgramCache]: Analyzing trace with hash 1807018750, now seen corresponding path program 1 times [2020-08-21 20:32:02,764 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:02,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [877134459] [2020-08-21 20:32:02,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:02,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:02,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:02,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:02,978 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:02,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:03,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,006 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 100 [2020-08-21 20:32:03,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 110 [2020-08-21 20:32:03,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,065 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 849 trivial. 0 not checked. [2020-08-21 20:32:03,066 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [877134459] [2020-08-21 20:32:03,066 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:32:03,066 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 20:32:03,067 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800533532] [2020-08-21 20:32:03,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 20:32:03,067 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:03,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 20:32:03,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:32:03,068 INFO L87 Difference]: Start difference. First operand 265 states and 401 transitions. Second operand 12 states. [2020-08-21 20:32:03,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:03,302 INFO L93 Difference]: Finished difference Result 284 states and 423 transitions. [2020-08-21 20:32:03,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:32:03,303 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 126 [2020-08-21 20:32:03,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:03,305 INFO L225 Difference]: With dead ends: 284 [2020-08-21 20:32:03,306 INFO L226 Difference]: Without dead ends: 274 [2020-08-21 20:32:03,306 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2020-08-21 20:32:03,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-08-21 20:32:03,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 271. [2020-08-21 20:32:03,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 271 states. [2020-08-21 20:32:03,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 408 transitions. [2020-08-21 20:32:03,336 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 408 transitions. Word has length 126 [2020-08-21 20:32:03,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:03,336 INFO L479 AbstractCegarLoop]: Abstraction has 271 states and 408 transitions. [2020-08-21 20:32:03,336 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 20:32:03,337 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 408 transitions. [2020-08-21 20:32:03,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-08-21 20:32:03,339 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:03,339 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:03,339 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-08-21 20:32:03,339 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:03,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:03,339 INFO L82 PathProgramCache]: Analyzing trace with hash -93481782, now seen corresponding path program 1 times [2020-08-21 20:32:03,340 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:03,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1922433340] [2020-08-21 20:32:03,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:03,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:03,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:03,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,398 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:03,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:03,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 100 [2020-08-21 20:32:03,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 110 [2020-08-21 20:32:03,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,485 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 849 trivial. 0 not checked. [2020-08-21 20:32:03,485 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1922433340] [2020-08-21 20:32:03,485 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:32:03,486 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-08-21 20:32:03,486 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961578281] [2020-08-21 20:32:03,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 20:32:03,486 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:03,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 20:32:03,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:32:03,487 INFO L87 Difference]: Start difference. First operand 271 states and 408 transitions. Second operand 8 states. [2020-08-21 20:32:03,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:03,600 INFO L93 Difference]: Finished difference Result 303 states and 449 transitions. [2020-08-21 20:32:03,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 20:32:03,600 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 127 [2020-08-21 20:32:03,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:03,603 INFO L225 Difference]: With dead ends: 303 [2020-08-21 20:32:03,603 INFO L226 Difference]: Without dead ends: 280 [2020-08-21 20:32:03,603 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:32:03,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2020-08-21 20:32:03,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 253. [2020-08-21 20:32:03,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 253 states. [2020-08-21 20:32:03,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 367 transitions. [2020-08-21 20:32:03,630 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 367 transitions. Word has length 127 [2020-08-21 20:32:03,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:03,631 INFO L479 AbstractCegarLoop]: Abstraction has 253 states and 367 transitions. [2020-08-21 20:32:03,631 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 20:32:03,631 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 367 transitions. [2020-08-21 20:32:03,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2020-08-21 20:32:03,633 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:03,633 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:03,633 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-08-21 20:32:03,633 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:03,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:03,634 INFO L82 PathProgramCache]: Analyzing trace with hash 2078176781, now seen corresponding path program 1 times [2020-08-21 20:32:03,634 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:03,634 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2044418753] [2020-08-21 20:32:03,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:03,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:03,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:03,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-08-21 20:32:03,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,740 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 97 [2020-08-21 20:32:03,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 104 [2020-08-21 20:32:03,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 114 [2020-08-21 20:32:03,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,754 INFO L134 CoverageAnalysis]: Checked inductivity of 860 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 846 trivial. 0 not checked. [2020-08-21 20:32:03,754 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2044418753] [2020-08-21 20:32:03,754 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:32:03,754 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 20:32:03,755 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [752640256] [2020-08-21 20:32:03,756 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 20:32:03,756 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:03,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 20:32:03,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:32:03,757 INFO L87 Difference]: Start difference. First operand 253 states and 367 transitions. Second operand 5 states. [2020-08-21 20:32:03,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:03,850 INFO L93 Difference]: Finished difference Result 409 states and 589 transitions. [2020-08-21 20:32:03,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 20:32:03,851 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 128 [2020-08-21 20:32:03,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:03,852 INFO L225 Difference]: With dead ends: 409 [2020-08-21 20:32:03,852 INFO L226 Difference]: Without dead ends: 155 [2020-08-21 20:32:03,853 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:32:03,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-08-21 20:32:03,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 140. [2020-08-21 20:32:03,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-08-21 20:32:03,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 202 transitions. [2020-08-21 20:32:03,874 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 202 transitions. Word has length 128 [2020-08-21 20:32:03,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:03,875 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 202 transitions. [2020-08-21 20:32:03,875 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 20:32:03,875 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 202 transitions. [2020-08-21 20:32:03,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2020-08-21 20:32:03,876 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:03,876 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:03,876 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-08-21 20:32:03,876 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:03,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:03,877 INFO L82 PathProgramCache]: Analyzing trace with hash 273720313, now seen corresponding path program 1 times [2020-08-21 20:32:03,877 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:03,877 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340540853] [2020-08-21 20:32:03,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:03,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:03,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:03,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:03,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:03,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 100 [2020-08-21 20:32:03,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:03,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 114 [2020-08-21 20:32:03,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,040 INFO L134 CoverageAnalysis]: Checked inductivity of 859 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 850 trivial. 0 not checked. [2020-08-21 20:32:04,040 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1340540853] [2020-08-21 20:32:04,041 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:32:04,041 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 20:32:04,041 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170245314] [2020-08-21 20:32:04,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 20:32:04,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:04,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 20:32:04,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:32:04,042 INFO L87 Difference]: Start difference. First operand 140 states and 202 transitions. Second operand 9 states. [2020-08-21 20:32:04,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:04,162 INFO L93 Difference]: Finished difference Result 173 states and 242 transitions. [2020-08-21 20:32:04,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 20:32:04,163 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 131 [2020-08-21 20:32:04,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:04,164 INFO L225 Difference]: With dead ends: 173 [2020-08-21 20:32:04,164 INFO L226 Difference]: Without dead ends: 163 [2020-08-21 20:32:04,165 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:32:04,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-08-21 20:32:04,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2020-08-21 20:32:04,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-08-21 20:32:04,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 226 transitions. [2020-08-21 20:32:04,182 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 226 transitions. Word has length 131 [2020-08-21 20:32:04,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:04,183 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 226 transitions. [2020-08-21 20:32:04,183 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 20:32:04,183 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 226 transitions. [2020-08-21 20:32:04,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2020-08-21 20:32:04,184 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:04,184 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:04,184 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-08-21 20:32:04,185 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:04,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:04,185 INFO L82 PathProgramCache]: Analyzing trace with hash -1006143365, now seen corresponding path program 1 times [2020-08-21 20:32:04,185 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:04,185 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1460346526] [2020-08-21 20:32:04,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:04,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:04,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:04,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:04,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:04,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,356 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 100 [2020-08-21 20:32:04,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 114 [2020-08-21 20:32:04,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,481 INFO L134 CoverageAnalysis]: Checked inductivity of 859 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 844 trivial. 0 not checked. [2020-08-21 20:32:04,481 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1460346526] [2020-08-21 20:32:04,481 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:32:04,481 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 20:32:04,482 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777592864] [2020-08-21 20:32:04,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 20:32:04,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:04,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 20:32:04,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:32:04,483 INFO L87 Difference]: Start difference. First operand 157 states and 226 transitions. Second operand 13 states. [2020-08-21 20:32:04,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:04,743 INFO L93 Difference]: Finished difference Result 175 states and 246 transitions. [2020-08-21 20:32:04,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 20:32:04,744 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 131 [2020-08-21 20:32:04,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:04,745 INFO L225 Difference]: With dead ends: 175 [2020-08-21 20:32:04,745 INFO L226 Difference]: Without dead ends: 150 [2020-08-21 20:32:04,746 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 20:32:04,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2020-08-21 20:32:04,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 137. [2020-08-21 20:32:04,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2020-08-21 20:32:04,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 173 transitions. [2020-08-21 20:32:04,758 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 173 transitions. Word has length 131 [2020-08-21 20:32:04,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:04,759 INFO L479 AbstractCegarLoop]: Abstraction has 137 states and 173 transitions. [2020-08-21 20:32:04,759 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 20:32:04,759 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 173 transitions. [2020-08-21 20:32:04,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-08-21 20:32:04,760 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:04,760 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:04,760 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2020-08-21 20:32:04,761 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:04,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:04,761 INFO L82 PathProgramCache]: Analyzing trace with hash 1204770984, now seen corresponding path program 2 times [2020-08-21 20:32:04,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:04,761 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [324843150] [2020-08-21 20:32:04,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:04,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,846 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:04,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:04,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:04,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:04,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 104 [2020-08-21 20:32:04,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 118 [2020-08-21 20:32:04,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:04,996 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 852 trivial. 0 not checked. [2020-08-21 20:32:04,996 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [324843150] [2020-08-21 20:32:04,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:32:04,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2020-08-21 20:32:04,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799878047] [2020-08-21 20:32:04,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 20:32:04,997 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:04,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 20:32:04,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:32:04,998 INFO L87 Difference]: Start difference. First operand 137 states and 173 transitions. Second operand 11 states. [2020-08-21 20:32:05,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:05,199 INFO L93 Difference]: Finished difference Result 184 states and 231 transitions. [2020-08-21 20:32:05,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:32:05,199 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 135 [2020-08-21 20:32:05,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:05,201 INFO L225 Difference]: With dead ends: 184 [2020-08-21 20:32:05,201 INFO L226 Difference]: Without dead ends: 174 [2020-08-21 20:32:05,202 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:32:05,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2020-08-21 20:32:05,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 157. [2020-08-21 20:32:05,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-08-21 20:32:05,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 202 transitions. [2020-08-21 20:32:05,221 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 202 transitions. Word has length 135 [2020-08-21 20:32:05,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:05,221 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 202 transitions. [2020-08-21 20:32:05,221 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 20:32:05,221 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 202 transitions. [2020-08-21 20:32:05,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-08-21 20:32:05,223 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:05,223 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:05,223 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2020-08-21 20:32:05,223 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:05,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:05,223 INFO L82 PathProgramCache]: Analyzing trace with hash -75092694, now seen corresponding path program 2 times [2020-08-21 20:32:05,224 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:05,224 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [946359012] [2020-08-21 20:32:05,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:05,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,371 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:05,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:05,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:05,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:05,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,460 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 104 [2020-08-21 20:32:05,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,464 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 118 [2020-08-21 20:32:05,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,480 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 849 trivial. 0 not checked. [2020-08-21 20:32:05,480 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [946359012] [2020-08-21 20:32:05,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:32:05,481 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 20:32:05,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653820750] [2020-08-21 20:32:05,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 20:32:05,481 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:05,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 20:32:05,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:32:05,482 INFO L87 Difference]: Start difference. First operand 157 states and 202 transitions. Second operand 11 states. [2020-08-21 20:32:05,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:05,655 INFO L93 Difference]: Finished difference Result 194 states and 247 transitions. [2020-08-21 20:32:05,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:32:05,656 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 135 [2020-08-21 20:32:05,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:05,657 INFO L225 Difference]: With dead ends: 194 [2020-08-21 20:32:05,657 INFO L226 Difference]: Without dead ends: 150 [2020-08-21 20:32:05,660 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2020-08-21 20:32:05,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2020-08-21 20:32:05,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 140. [2020-08-21 20:32:05,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-08-21 20:32:05,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 176 transitions. [2020-08-21 20:32:05,679 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 176 transitions. Word has length 135 [2020-08-21 20:32:05,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:05,680 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 176 transitions. [2020-08-21 20:32:05,680 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 20:32:05,680 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 176 transitions. [2020-08-21 20:32:05,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-08-21 20:32:05,681 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:05,681 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:05,681 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2020-08-21 20:32:05,681 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:05,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:05,682 INFO L82 PathProgramCache]: Analyzing trace with hash 681202148, now seen corresponding path program 1 times [2020-08-21 20:32:05,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:05,682 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1056660328] [2020-08-21 20:32:05,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:05,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,783 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:05,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:05,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,815 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:05,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:05,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 104 [2020-08-21 20:32:05,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 118 [2020-08-21 20:32:05,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:05,914 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 855 trivial. 0 not checked. [2020-08-21 20:32:05,915 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1056660328] [2020-08-21 20:32:05,915 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:32:05,915 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 20:32:05,915 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613830893] [2020-08-21 20:32:05,915 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 20:32:05,916 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:05,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 20:32:05,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:32:05,916 INFO L87 Difference]: Start difference. First operand 140 states and 176 transitions. Second operand 10 states. [2020-08-21 20:32:06,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:06,106 INFO L93 Difference]: Finished difference Result 160 states and 199 transitions. [2020-08-21 20:32:06,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:32:06,107 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 135 [2020-08-21 20:32:06,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:06,109 INFO L225 Difference]: With dead ends: 160 [2020-08-21 20:32:06,109 INFO L226 Difference]: Without dead ends: 140 [2020-08-21 20:32:06,109 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:32:06,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2020-08-21 20:32:06,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 140. [2020-08-21 20:32:06,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-08-21 20:32:06,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 175 transitions. [2020-08-21 20:32:06,125 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 175 transitions. Word has length 135 [2020-08-21 20:32:06,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:06,126 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 175 transitions. [2020-08-21 20:32:06,126 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 20:32:06,127 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 175 transitions. [2020-08-21 20:32:06,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-08-21 20:32:06,128 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:06,128 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:06,128 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2020-08-21 20:32:06,128 INFO L427 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:06,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:06,129 INFO L82 PathProgramCache]: Analyzing trace with hash -598661530, now seen corresponding path program 1 times [2020-08-21 20:32:06,129 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:06,129 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1823336516] [2020-08-21 20:32:06,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:06,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:06,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:06,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:06,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:06,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:06,336 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:06,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:06,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:06,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:06,363 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 104 [2020-08-21 20:32:06,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:06,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 118 [2020-08-21 20:32:06,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:06,526 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 849 trivial. 0 not checked. [2020-08-21 20:32:06,526 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1823336516] [2020-08-21 20:32:06,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:32:06,527 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 20:32:06,527 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029613646] [2020-08-21 20:32:06,527 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 20:32:06,527 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:06,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 20:32:06,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:32:06,528 INFO L87 Difference]: Start difference. First operand 140 states and 175 transitions. Second operand 13 states. [2020-08-21 20:32:06,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:06,801 INFO L93 Difference]: Finished difference Result 155 states and 190 transitions. [2020-08-21 20:32:06,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 20:32:06,804 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 135 [2020-08-21 20:32:06,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:06,806 INFO L225 Difference]: With dead ends: 155 [2020-08-21 20:32:06,806 INFO L226 Difference]: Without dead ends: 137 [2020-08-21 20:32:06,807 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2020-08-21 20:32:06,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2020-08-21 20:32:06,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2020-08-21 20:32:06,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2020-08-21 20:32:06,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 171 transitions. [2020-08-21 20:32:06,821 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 171 transitions. Word has length 135 [2020-08-21 20:32:06,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:06,821 INFO L479 AbstractCegarLoop]: Abstraction has 137 states and 171 transitions. [2020-08-21 20:32:06,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 20:32:06,821 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 171 transitions. [2020-08-21 20:32:06,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-08-21 20:32:06,822 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:32:06,822 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:32:06,822 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2020-08-21 20:32:06,823 INFO L427 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:32:06,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:32:06,823 INFO L82 PathProgramCache]: Analyzing trace with hash -114976086, now seen corresponding path program 1 times [2020-08-21 20:32:06,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:32:06,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [17536018] [2020-08-21 20:32:06,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:32:06,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:06,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:32:06,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:06,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:32:06,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:06,967 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-08-21 20:32:06,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:07,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2020-08-21 20:32:07,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:07,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 104 [2020-08-21 20:32:07,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:07,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 118 [2020-08-21 20:32:07,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:32:07,131 INFO L134 CoverageAnalysis]: Checked inductivity of 866 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 857 trivial. 0 not checked. [2020-08-21 20:32:07,132 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [17536018] [2020-08-21 20:32:07,132 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:32:07,132 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 20:32:07,133 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744542410] [2020-08-21 20:32:07,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 20:32:07,134 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:32:07,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 20:32:07,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:32:07,135 INFO L87 Difference]: Start difference. First operand 137 states and 171 transitions. Second operand 10 states. [2020-08-21 20:32:07,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:32:07,297 INFO L93 Difference]: Finished difference Result 137 states and 171 transitions. [2020-08-21 20:32:07,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:32:07,297 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 135 [2020-08-21 20:32:07,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:32:07,297 INFO L225 Difference]: With dead ends: 137 [2020-08-21 20:32:07,297 INFO L226 Difference]: Without dead ends: 0 [2020-08-21 20:32:07,298 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:32:07,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-21 20:32:07,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-21 20:32:07,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-21 20:32:07,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-21 20:32:07,299 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 135 [2020-08-21 20:32:07,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:32:07,299 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-21 20:32:07,300 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 20:32:07,300 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-21 20:32:07,300 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-21 20:32:07,300 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2020-08-21 20:32:07,305 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-21 20:32:08,040 WARN L193 SmtUtils]: Spent 711.00 ms on a formula simplification. DAG size of input: 598 DAG size of output: 136 [2020-08-21 20:32:13,530 WARN L193 SmtUtils]: Spent 5.48 s on a formula simplification. DAG size of input: 558 DAG size of output: 226