/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 false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-eb0fd7c [2020-09-21 10:28:03,184 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-21 10:28:03,189 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-21 10:28:03,232 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-21 10:28:03,232 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 10:28:03,243 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 10:28:03,246 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 10:28:03,250 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 10:28:03,254 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 10:28:03,257 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 10:28:03,259 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 10:28:03,260 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 10:28:03,260 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 10:28:03,264 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 10:28:03,267 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 10:28:03,269 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 10:28:03,271 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 10:28:03,272 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 10:28:03,275 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 10:28:03,285 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 10:28:03,288 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 10:28:03,289 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 10:28:03,291 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 10:28:03,292 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 10:28:03,295 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-21 10:28:03,295 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-21 10:28:03,295 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-21 10:28:03,298 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-21 10:28:03,299 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-21 10:28:03,300 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-21 10:28:03,300 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-21 10:28:03,301 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-21 10:28:03,302 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-21 10:28:03,303 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-21 10:28:03,304 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-21 10:28:03,304 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-21 10:28:03,305 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-21 10:28:03,305 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-21 10:28:03,306 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 10:28:03,307 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 10:28:03,307 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 10:28:03,308 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 [2020-09-21 10:28:03,336 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 10:28:03,336 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 10:28:03,337 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 10:28:03,338 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 10:28:03,338 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 10:28:03,338 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 10:28:03,338 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 10:28:03,339 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 10:28:03,339 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 10:28:03,339 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 10:28:03,339 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 10:28:03,340 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 10:28:03,340 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 10:28:03,340 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 10:28:03,340 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 10:28:03,340 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 10:28:03,341 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 10:28:03,341 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 10:28:03,341 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 10:28:03,341 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 10:28:03,342 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 10:28:03,342 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:28:03,342 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 10:28:03,342 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 10:28:03,343 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 10:28:03,343 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 10:28:03,343 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 10:28:03,343 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 10:28:03,343 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 10:28:03,344 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 -> false [2020-09-21 10:28:03,867 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 10:28:03,884 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 10:28:03,891 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 10:28:03,893 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 10:28:03,893 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 10:28:03,895 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-09-21 10:28:03,991 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/87e2f3441/41d826906f29417b81b2914ff8c5c1c9/FLAG9548732ca [2020-09-21 10:28:04,563 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 10:28:04,564 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-09-21 10:28:04,573 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/87e2f3441/41d826906f29417b81b2914ff8c5c1c9/FLAG9548732ca [2020-09-21 10:28:04,900 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/87e2f3441/41d826906f29417b81b2914ff8c5c1c9 [2020-09-21 10:28:04,913 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 10:28:04,918 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 10:28:04,919 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 10:28:04,919 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 10:28:04,923 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 10:28:04,924 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:28:04" (1/1) ... [2020-09-21 10:28:04,928 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3dd6f99d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:04, skipping insertion in model container [2020-09-21 10:28:04,929 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:28:04" (1/1) ... [2020-09-21 10:28:04,937 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 10:28:04,961 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 10:28:05,198 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:28:05,207 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 10:28:05,227 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:28:05,244 INFO L208 MainTranslator]: Completed translation [2020-09-21 10:28:05,244 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:05 WrapperNode [2020-09-21 10:28:05,245 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 10:28:05,245 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 10:28:05,246 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 10:28:05,246 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 10:28:05,338 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:05" (1/1) ... [2020-09-21 10:28:05,338 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:05" (1/1) ... [2020-09-21 10:28:05,351 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:05" (1/1) ... [2020-09-21 10:28:05,352 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:05" (1/1) ... [2020-09-21 10:28:05,360 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:05" (1/1) ... [2020-09-21 10:28:05,367 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:05" (1/1) ... [2020-09-21 10:28:05,369 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:05" (1/1) ... [2020-09-21 10:28:05,375 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 10:28:05,376 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 10:28:05,376 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 10:28:05,376 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 10:28:05,377 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:05" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:28:05,471 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 10:28:05,471 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 10:28:05,471 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-21 10:28:05,472 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-09-21 10:28:05,472 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 10:28:05,472 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 10:28:05,474 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-21 10:28:05,474 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-09-21 10:28:05,474 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-09-21 10:28:05,474 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-09-21 10:28:05,475 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-09-21 10:28:05,475 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-09-21 10:28:05,475 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 10:28:05,475 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-21 10:28:05,476 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-09-21 10:28:05,477 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-21 10:28:05,477 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 10:28:05,477 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 10:28:05,776 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 10:28:05,776 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-09-21 10:28:05,782 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:28:05 BoogieIcfgContainer [2020-09-21 10:28:05,782 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 10:28:05,783 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 10:28:05,783 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 10:28:05,788 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 10:28:05,788 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 10:28:04" (1/3) ... [2020-09-21 10:28:05,789 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48b142e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:28:05, skipping insertion in model container [2020-09-21 10:28:05,789 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:05" (2/3) ... [2020-09-21 10:28:05,790 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48b142e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:28:05, skipping insertion in model container [2020-09-21 10:28:05,791 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:28:05" (3/3) ... [2020-09-21 10:28:05,793 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-09-21 10:28:05,808 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 10:28:05,818 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 10:28:05,843 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 10:28:05,877 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 10:28:05,878 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 10:28:05,878 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 10:28:05,878 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 10:28:05,878 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 10:28:05,879 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 10:28:05,879 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 10:28:05,879 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 10:28:05,903 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-09-21 10:28:05,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-09-21 10:28:05,911 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:05,913 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:05,913 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:05,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:05,922 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-09-21 10:28:05,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:05,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [932214328] [2020-09-21 10:28:05,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:06,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:06,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:06,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:06,173 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:06,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:06,188 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:06,190 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [932214328] [2020-09-21 10:28:06,197 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:28:06,198 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-21 10:28:06,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [734892984] [2020-09-21 10:28:06,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 10:28:06,208 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:06,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 10:28:06,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:28:06,229 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-09-21 10:28:06,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:06,405 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-09-21 10:28:06,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-21 10:28:06,407 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-09-21 10:28:06,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:06,421 INFO L225 Difference]: With dead ends: 59 [2020-09-21 10:28:06,422 INFO L226 Difference]: Without dead ends: 31 [2020-09-21 10:28:06,426 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:28:06,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-09-21 10:28:06,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-09-21 10:28:06,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-09-21 10:28:06,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-09-21 10:28:06,474 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-09-21 10:28:06,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:06,475 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-09-21 10:28:06,475 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 10:28:06,475 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-09-21 10:28:06,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-09-21 10:28:06,476 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:06,477 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:06,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 10:28:06,477 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:06,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:06,478 INFO L82 PathProgramCache]: Analyzing trace with hash -931069882, now seen corresponding path program 1 times [2020-09-21 10:28:06,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:06,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [719040925] [2020-09-21 10:28:06,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:06,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:06,600 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:06,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:06,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:06,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:06,709 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:06,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [719040925] [2020-09-21 10:28:06,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:28:06,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-09-21 10:28:06,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452765812] [2020-09-21 10:28:06,713 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 10:28:06,713 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:06,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 10:28:06,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:28:06,714 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-09-21 10:28:06,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:06,928 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-09-21 10:28:06,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 10:28:06,928 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-09-21 10:28:06,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:06,930 INFO L225 Difference]: With dead ends: 48 [2020-09-21 10:28:06,930 INFO L226 Difference]: Without dead ends: 30 [2020-09-21 10:28:06,932 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-09-21 10:28:06,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-09-21 10:28:06,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-09-21 10:28:06,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-09-21 10:28:06,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-09-21 10:28:06,941 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-09-21 10:28:06,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:06,942 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-09-21 10:28:06,942 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 10:28:06,942 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-09-21 10:28:06,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-21 10:28:06,943 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:06,943 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:06,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 10:28:06,944 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:06,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:06,945 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-09-21 10:28:06,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:06,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [946532612] [2020-09-21 10:28:06,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:06,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:07,017 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:07,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:07,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:07,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:07,151 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:07,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [946532612] [2020-09-21 10:28:07,152 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:07,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-21 10:28:07,153 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633790419] [2020-09-21 10:28:07,153 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-21 10:28:07,153 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:07,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-21 10:28:07,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:28:07,154 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-09-21 10:28:07,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:07,334 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-09-21 10:28:07,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-21 10:28:07,335 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-09-21 10:28:07,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:07,336 INFO L225 Difference]: With dead ends: 50 [2020-09-21 10:28:07,336 INFO L226 Difference]: Without dead ends: 32 [2020-09-21 10:28:07,337 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:28:07,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-09-21 10:28:07,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-09-21 10:28:07,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-09-21 10:28:07,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-09-21 10:28:07,345 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-09-21 10:28:07,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:07,345 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-09-21 10:28:07,346 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-21 10:28:07,346 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-09-21 10:28:07,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-09-21 10:28:07,347 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:07,347 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:07,347 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 10:28:07,348 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:07,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:07,348 INFO L82 PathProgramCache]: Analyzing trace with hash 2059999690, now seen corresponding path program 2 times [2020-09-21 10:28:07,348 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:07,349 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1162477815] [2020-09-21 10:28:07,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:07,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:07,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:07,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:07,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:07,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:07,627 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:07,628 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1162477815] [2020-09-21 10:28:07,628 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:07,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-21 10:28:07,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385033526] [2020-09-21 10:28:07,629 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-21 10:28:07,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:07,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-21 10:28:07,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-09-21 10:28:07,631 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-09-21 10:28:07,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:07,811 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-09-21 10:28:07,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-21 10:28:07,812 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-09-21 10:28:07,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:07,813 INFO L225 Difference]: With dead ends: 52 [2020-09-21 10:28:07,813 INFO L226 Difference]: Without dead ends: 34 [2020-09-21 10:28:07,814 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-09-21 10:28:07,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-09-21 10:28:07,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-09-21 10:28:07,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-09-21 10:28:07,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-09-21 10:28:07,821 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-09-21 10:28:07,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:07,821 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-09-21 10:28:07,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-21 10:28:07,822 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-09-21 10:28:07,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-09-21 10:28:07,823 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:07,823 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:07,823 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 10:28:07,823 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:07,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:07,824 INFO L82 PathProgramCache]: Analyzing trace with hash -1428164148, now seen corresponding path program 3 times [2020-09-21 10:28:07,824 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:07,824 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1139797272] [2020-09-21 10:28:07,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:07,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:07,895 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:07,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:07,919 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:07,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:08,123 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:08,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1139797272] [2020-09-21 10:28:08,124 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:08,124 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-21 10:28:08,124 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683364391] [2020-09-21 10:28:08,125 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-21 10:28:08,125 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:08,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-21 10:28:08,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-09-21 10:28:08,126 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-09-21 10:28:08,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:08,315 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-09-21 10:28:08,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-21 10:28:08,316 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-09-21 10:28:08,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:08,317 INFO L225 Difference]: With dead ends: 54 [2020-09-21 10:28:08,317 INFO L226 Difference]: Without dead ends: 36 [2020-09-21 10:28:08,318 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-09-21 10:28:08,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-09-21 10:28:08,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-09-21 10:28:08,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-09-21 10:28:08,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-09-21 10:28:08,324 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-09-21 10:28:08,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:08,325 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-09-21 10:28:08,325 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-21 10:28:08,325 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-09-21 10:28:08,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-09-21 10:28:08,326 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:08,326 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:08,326 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-21 10:28:08,327 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:08,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:08,327 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 4 times [2020-09-21 10:28:08,328 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:08,328 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1492198017] [2020-09-21 10:28:08,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:08,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:08,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:08,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:08,386 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:08,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:08,586 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:08,587 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1492198017] [2020-09-21 10:28:08,587 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:08,587 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-21 10:28:08,587 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1187361193] [2020-09-21 10:28:08,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-21 10:28:08,588 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:08,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-21 10:28:08,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:28:08,589 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-09-21 10:28:08,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:08,764 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-09-21 10:28:08,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-21 10:28:08,764 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-09-21 10:28:08,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:08,765 INFO L225 Difference]: With dead ends: 56 [2020-09-21 10:28:08,765 INFO L226 Difference]: Without dead ends: 38 [2020-09-21 10:28:08,766 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:28:08,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-09-21 10:28:08,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-09-21 10:28:08,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-09-21 10:28:08,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-09-21 10:28:08,772 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-09-21 10:28:08,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:08,773 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-09-21 10:28:08,773 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-21 10:28:08,773 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-09-21 10:28:08,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-09-21 10:28:08,774 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:08,774 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:08,775 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-21 10:28:08,775 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:08,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:08,775 INFO L82 PathProgramCache]: Analyzing trace with hash 1235736656, now seen corresponding path program 5 times [2020-09-21 10:28:08,775 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:08,776 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [5922531] [2020-09-21 10:28:08,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:08,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:08,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:08,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:08,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:08,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:09,088 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:09,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [5922531] [2020-09-21 10:28:09,089 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:09,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-09-21 10:28:09,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595351387] [2020-09-21 10:28:09,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-21 10:28:09,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:09,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-21 10:28:09,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-09-21 10:28:09,092 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-09-21 10:28:09,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:09,333 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-09-21 10:28:09,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-09-21 10:28:09,334 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-09-21 10:28:09,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:09,335 INFO L225 Difference]: With dead ends: 58 [2020-09-21 10:28:09,335 INFO L226 Difference]: Without dead ends: 40 [2020-09-21 10:28:09,336 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-09-21 10:28:09,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-09-21 10:28:09,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-09-21 10:28:09,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-09-21 10:28:09,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-09-21 10:28:09,343 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-09-21 10:28:09,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:09,344 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-09-21 10:28:09,344 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-21 10:28:09,344 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-09-21 10:28:09,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-09-21 10:28:09,345 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:09,345 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:09,345 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-21 10:28:09,345 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:09,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:09,346 INFO L82 PathProgramCache]: Analyzing trace with hash 1024009938, now seen corresponding path program 6 times [2020-09-21 10:28:09,346 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:09,346 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2077399200] [2020-09-21 10:28:09,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:09,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:09,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:09,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:09,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:09,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:09,777 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:09,777 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2077399200] [2020-09-21 10:28:09,778 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:09,778 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-09-21 10:28:09,778 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141629467] [2020-09-21 10:28:09,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-21 10:28:09,778 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:09,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-21 10:28:09,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-09-21 10:28:09,779 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-09-21 10:28:09,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:09,996 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-09-21 10:28:09,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-21 10:28:09,996 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-09-21 10:28:09,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:09,997 INFO L225 Difference]: With dead ends: 60 [2020-09-21 10:28:09,997 INFO L226 Difference]: Without dead ends: 42 [2020-09-21 10:28:10,000 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-09-21 10:28:10,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-09-21 10:28:10,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-09-21 10:28:10,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-09-21 10:28:10,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-09-21 10:28:10,012 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-09-21 10:28:10,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:10,013 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-09-21 10:28:10,015 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-21 10:28:10,015 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-09-21 10:28:10,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-09-21 10:28:10,016 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:10,017 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:10,017 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-21 10:28:10,017 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:10,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:10,017 INFO L82 PathProgramCache]: Analyzing trace with hash -581903148, now seen corresponding path program 7 times [2020-09-21 10:28:10,021 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:10,021 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [628465645] [2020-09-21 10:28:10,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:10,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:10,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:10,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:10,106 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:10,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:10,489 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:10,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [628465645] [2020-09-21 10:28:10,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:10,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-21 10:28:10,492 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674372159] [2020-09-21 10:28:10,493 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-21 10:28:10,493 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:10,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-21 10:28:10,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:28:10,494 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-09-21 10:28:10,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:10,761 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-09-21 10:28:10,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-21 10:28:10,762 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-09-21 10:28:10,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:10,763 INFO L225 Difference]: With dead ends: 62 [2020-09-21 10:28:10,763 INFO L226 Difference]: Without dead ends: 44 [2020-09-21 10:28:10,764 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-09-21 10:28:10,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-09-21 10:28:10,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-09-21 10:28:10,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-09-21 10:28:10,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-09-21 10:28:10,770 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-09-21 10:28:10,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:10,771 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-09-21 10:28:10,771 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-21 10:28:10,771 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-09-21 10:28:10,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-09-21 10:28:10,772 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:10,772 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:10,773 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-21 10:28:10,773 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:10,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:10,773 INFO L82 PathProgramCache]: Analyzing trace with hash -1971119530, now seen corresponding path program 8 times [2020-09-21 10:28:10,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:10,774 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [359392671] [2020-09-21 10:28:10,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:10,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:10,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:10,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:10,846 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:10,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:11,209 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:11,210 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [359392671] [2020-09-21 10:28:11,210 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:11,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-09-21 10:28:11,211 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648002490] [2020-09-21 10:28:11,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-09-21 10:28:11,211 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:11,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-09-21 10:28:11,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-09-21 10:28:11,212 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-09-21 10:28:11,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:11,467 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-09-21 10:28:11,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-21 10:28:11,468 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-09-21 10:28:11,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:11,469 INFO L225 Difference]: With dead ends: 64 [2020-09-21 10:28:11,469 INFO L226 Difference]: Without dead ends: 46 [2020-09-21 10:28:11,470 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-09-21 10:28:11,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-09-21 10:28:11,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-09-21 10:28:11,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-09-21 10:28:11,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-09-21 10:28:11,477 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-09-21 10:28:11,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:11,486 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-09-21 10:28:11,486 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-09-21 10:28:11,486 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-09-21 10:28:11,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-09-21 10:28:11,487 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:11,487 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:11,487 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-21 10:28:11,488 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:11,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:11,488 INFO L82 PathProgramCache]: Analyzing trace with hash -1273233576, now seen corresponding path program 9 times [2020-09-21 10:28:11,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:11,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [196573896] [2020-09-21 10:28:11,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:11,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:11,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:11,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:11,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:11,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:11,578 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-09-21 10:28:11,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [196573896] [2020-09-21 10:28:11,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:28:11,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-21 10:28:11,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380566339] [2020-09-21 10:28:11,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 10:28:11,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:11,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 10:28:11,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:28:11,580 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-09-21 10:28:11,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:11,676 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-09-21 10:28:11,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-21 10:28:11,676 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-09-21 10:28:11,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:11,679 INFO L225 Difference]: With dead ends: 65 [2020-09-21 10:28:11,679 INFO L226 Difference]: Without dead ends: 53 [2020-09-21 10:28:11,680 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:28:11,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-09-21 10:28:11,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-09-21 10:28:11,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-09-21 10:28:11,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-09-21 10:28:11,692 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-09-21 10:28:11,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:11,692 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-09-21 10:28:11,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 10:28:11,693 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-09-21 10:28:11,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-09-21 10:28:11,693 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:11,694 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:11,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-21 10:28:11,694 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:11,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:11,695 INFO L82 PathProgramCache]: Analyzing trace with hash -1053921041, now seen corresponding path program 1 times [2020-09-21 10:28:11,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:11,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1306341555] [2020-09-21 10:28:11,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:11,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:11,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:11,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:11,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:11,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:11,786 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-09-21 10:28:11,786 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1306341555] [2020-09-21 10:28:11,786 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:11,787 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-09-21 10:28:11,787 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352120400] [2020-09-21 10:28:11,787 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 10:28:11,787 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:11,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 10:28:11,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:28:11,788 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-09-21 10:28:11,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:11,895 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-09-21 10:28:11,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 10:28:11,896 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-09-21 10:28:11,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:11,897 INFO L225 Difference]: With dead ends: 73 [2020-09-21 10:28:11,897 INFO L226 Difference]: Without dead ends: 61 [2020-09-21 10:28:11,898 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:28:11,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-09-21 10:28:11,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-09-21 10:28:11,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-09-21 10:28:11,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-09-21 10:28:11,904 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-09-21 10:28:11,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:11,905 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-09-21 10:28:11,905 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 10:28:11,905 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-09-21 10:28:11,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-09-21 10:28:11,906 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:11,906 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:11,906 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-09-21 10:28:11,907 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:11,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:11,907 INFO L82 PathProgramCache]: Analyzing trace with hash -159448072, now seen corresponding path program 2 times [2020-09-21 10:28:11,907 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:11,908 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [209766803] [2020-09-21 10:28:11,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:11,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:11,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:11,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:11,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:11,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:11,991 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-09-21 10:28:11,992 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [209766803] [2020-09-21 10:28:11,992 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:28:11,992 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-21 10:28:11,992 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012247429] [2020-09-21 10:28:11,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 10:28:11,993 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:11,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 10:28:11,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:28:11,994 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-09-21 10:28:12,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:12,067 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-09-21 10:28:12,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-21 10:28:12,067 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-09-21 10:28:12,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:12,068 INFO L225 Difference]: With dead ends: 69 [2020-09-21 10:28:12,068 INFO L226 Difference]: Without dead ends: 49 [2020-09-21 10:28:12,069 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:28:12,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-09-21 10:28:12,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-09-21 10:28:12,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-09-21 10:28:12,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-09-21 10:28:12,080 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-09-21 10:28:12,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:12,081 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-09-21 10:28:12,081 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 10:28:12,081 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-09-21 10:28:12,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-09-21 10:28:12,083 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:12,083 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:12,083 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-09-21 10:28:12,084 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:12,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:12,084 INFO L82 PathProgramCache]: Analyzing trace with hash -1139281096, now seen corresponding path program 1 times [2020-09-21 10:28:12,084 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:12,085 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1345774096] [2020-09-21 10:28:12,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:12,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:12,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:12,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:12,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:12,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:12,604 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:12,605 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1345774096] [2020-09-21 10:28:12,605 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:12,605 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-09-21 10:28:12,605 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903478410] [2020-09-21 10:28:12,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-09-21 10:28:12,606 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:12,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-09-21 10:28:12,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-09-21 10:28:12,607 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-09-21 10:28:12,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:12,823 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-09-21 10:28:12,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-21 10:28:12,824 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-09-21 10:28:12,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:12,825 INFO L225 Difference]: With dead ends: 74 [2020-09-21 10:28:12,825 INFO L226 Difference]: Without dead ends: 52 [2020-09-21 10:28:12,826 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-09-21 10:28:12,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-09-21 10:28:12,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-09-21 10:28:12,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-09-21 10:28:12,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-09-21 10:28:12,840 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-09-21 10:28:12,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:12,840 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-09-21 10:28:12,841 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-09-21 10:28:12,841 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-09-21 10:28:12,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-09-21 10:28:12,842 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:12,842 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:12,842 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-09-21 10:28:12,842 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:12,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:12,843 INFO L82 PathProgramCache]: Analyzing trace with hash 763672122, now seen corresponding path program 2 times [2020-09-21 10:28:12,843 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:12,843 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [937763216] [2020-09-21 10:28:12,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:12,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:12,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:12,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:12,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:12,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:13,527 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:13,529 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [937763216] [2020-09-21 10:28:13,529 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:13,529 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-09-21 10:28:13,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588337584] [2020-09-21 10:28:13,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-09-21 10:28:13,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:13,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-09-21 10:28:13,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-09-21 10:28:13,531 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-09-21 10:28:13,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:13,787 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-09-21 10:28:13,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-09-21 10:28:13,788 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-09-21 10:28:13,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:13,789 INFO L225 Difference]: With dead ends: 76 [2020-09-21 10:28:13,789 INFO L226 Difference]: Without dead ends: 54 [2020-09-21 10:28:13,790 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-09-21 10:28:13,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-09-21 10:28:13,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-09-21 10:28:13,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-09-21 10:28:13,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-09-21 10:28:13,795 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-09-21 10:28:13,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:13,796 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-09-21 10:28:13,796 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-09-21 10:28:13,796 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-09-21 10:28:13,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-09-21 10:28:13,797 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:13,797 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:13,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-09-21 10:28:13,798 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:13,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:13,798 INFO L82 PathProgramCache]: Analyzing trace with hash -154353476, now seen corresponding path program 3 times [2020-09-21 10:28:13,798 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:13,798 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1987624100] [2020-09-21 10:28:13,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:13,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:13,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:13,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:13,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:13,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:14,409 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:14,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1987624100] [2020-09-21 10:28:14,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:14,411 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-09-21 10:28:14,412 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127354809] [2020-09-21 10:28:14,412 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-09-21 10:28:14,412 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:14,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-09-21 10:28:14,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-09-21 10:28:14,413 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-09-21 10:28:14,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:14,648 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-09-21 10:28:14,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-09-21 10:28:14,648 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-09-21 10:28:14,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:14,649 INFO L225 Difference]: With dead ends: 78 [2020-09-21 10:28:14,649 INFO L226 Difference]: Without dead ends: 56 [2020-09-21 10:28:14,650 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-09-21 10:28:14,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-09-21 10:28:14,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-09-21 10:28:14,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-09-21 10:28:14,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-09-21 10:28:14,655 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-09-21 10:28:14,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:14,655 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-09-21 10:28:14,655 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-09-21 10:28:14,656 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-09-21 10:28:14,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-09-21 10:28:14,656 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:14,656 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:14,657 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-09-21 10:28:14,657 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:14,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:14,657 INFO L82 PathProgramCache]: Analyzing trace with hash -1908657474, now seen corresponding path program 4 times [2020-09-21 10:28:14,657 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:14,658 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1567262463] [2020-09-21 10:28:14,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:14,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:14,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:14,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:14,727 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:14,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:15,303 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:15,303 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1567262463] [2020-09-21 10:28:15,303 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:15,303 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-09-21 10:28:15,304 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243448600] [2020-09-21 10:28:15,304 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-09-21 10:28:15,304 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:15,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-09-21 10:28:15,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-09-21 10:28:15,305 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-09-21 10:28:15,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:15,583 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-09-21 10:28:15,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-09-21 10:28:15,583 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-09-21 10:28:15,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:15,584 INFO L225 Difference]: With dead ends: 80 [2020-09-21 10:28:15,585 INFO L226 Difference]: Without dead ends: 58 [2020-09-21 10:28:15,586 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-09-21 10:28:15,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-09-21 10:28:15,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-09-21 10:28:15,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-09-21 10:28:15,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-09-21 10:28:15,591 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-09-21 10:28:15,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:15,591 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-09-21 10:28:15,591 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-09-21 10:28:15,592 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-09-21 10:28:15,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-09-21 10:28:15,592 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:15,592 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:15,593 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-09-21 10:28:15,593 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:15,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:15,593 INFO L82 PathProgramCache]: Analyzing trace with hash 127347776, now seen corresponding path program 5 times [2020-09-21 10:28:15,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:15,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [33001089] [2020-09-21 10:28:15,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:15,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:15,661 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:15,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:15,673 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:15,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:16,435 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:16,435 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [33001089] [2020-09-21 10:28:16,435 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:16,436 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-09-21 10:28:16,436 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171673768] [2020-09-21 10:28:16,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-09-21 10:28:16,436 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:16,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-09-21 10:28:16,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-09-21 10:28:16,437 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-09-21 10:28:16,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:16,772 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-09-21 10:28:16,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-09-21 10:28:16,772 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-09-21 10:28:16,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:16,773 INFO L225 Difference]: With dead ends: 82 [2020-09-21 10:28:16,773 INFO L226 Difference]: Without dead ends: 60 [2020-09-21 10:28:16,774 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-09-21 10:28:16,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-09-21 10:28:16,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-09-21 10:28:16,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-09-21 10:28:16,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-09-21 10:28:16,781 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-09-21 10:28:16,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:16,781 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-09-21 10:28:16,781 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-09-21 10:28:16,782 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-09-21 10:28:16,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-09-21 10:28:16,782 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:16,783 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:16,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-09-21 10:28:16,783 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:16,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:16,784 INFO L82 PathProgramCache]: Analyzing trace with hash -1776693950, now seen corresponding path program 6 times [2020-09-21 10:28:16,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:16,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [969476979] [2020-09-21 10:28:16,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:16,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:16,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:16,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:16,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:16,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:17,636 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:17,636 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [969476979] [2020-09-21 10:28:17,636 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:17,636 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-09-21 10:28:17,637 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [856287578] [2020-09-21 10:28:17,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-09-21 10:28:17,637 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:17,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-09-21 10:28:17,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-09-21 10:28:17,638 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-09-21 10:28:17,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:17,967 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-09-21 10:28:17,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-09-21 10:28:17,973 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-09-21 10:28:17,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:17,974 INFO L225 Difference]: With dead ends: 84 [2020-09-21 10:28:17,974 INFO L226 Difference]: Without dead ends: 62 [2020-09-21 10:28:17,975 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-09-21 10:28:17,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-09-21 10:28:17,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-09-21 10:28:17,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-09-21 10:28:17,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-09-21 10:28:17,979 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-09-21 10:28:17,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:17,980 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-09-21 10:28:17,980 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-09-21 10:28:17,980 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-09-21 10:28:17,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-09-21 10:28:17,980 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:17,981 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:17,981 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-09-21 10:28:17,981 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:17,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:17,982 INFO L82 PathProgramCache]: Analyzing trace with hash -1904724540, now seen corresponding path program 7 times [2020-09-21 10:28:17,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:17,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1786204368] [2020-09-21 10:28:17,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:18,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:18,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:18,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:18,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:18,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:18,939 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:18,939 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1786204368] [2020-09-21 10:28:18,940 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:18,940 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-09-21 10:28:18,940 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285927979] [2020-09-21 10:28:18,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-09-21 10:28:18,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:18,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-09-21 10:28:18,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-09-21 10:28:18,943 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-09-21 10:28:19,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:19,193 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-09-21 10:28:19,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-09-21 10:28:19,194 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-09-21 10:28:19,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:19,195 INFO L225 Difference]: With dead ends: 86 [2020-09-21 10:28:19,195 INFO L226 Difference]: Without dead ends: 64 [2020-09-21 10:28:19,196 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-09-21 10:28:19,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-09-21 10:28:19,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-09-21 10:28:19,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-09-21 10:28:19,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-09-21 10:28:19,200 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-09-21 10:28:19,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:19,201 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-09-21 10:28:19,201 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-09-21 10:28:19,201 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-09-21 10:28:19,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-09-21 10:28:19,202 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:19,202 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:19,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-09-21 10:28:19,202 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:19,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:19,203 INFO L82 PathProgramCache]: Analyzing trace with hash -388069946, now seen corresponding path program 8 times [2020-09-21 10:28:19,203 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:19,203 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [282053156] [2020-09-21 10:28:19,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:19,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:19,280 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:19,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:19,292 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:19,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:20,217 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:20,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [282053156] [2020-09-21 10:28:20,218 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:20,218 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-09-21 10:28:20,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066870623] [2020-09-21 10:28:20,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-09-21 10:28:20,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:20,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-09-21 10:28:20,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-09-21 10:28:20,220 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-09-21 10:28:20,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:20,610 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-09-21 10:28:20,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-09-21 10:28:20,611 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-09-21 10:28:20,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:20,611 INFO L225 Difference]: With dead ends: 88 [2020-09-21 10:28:20,612 INFO L226 Difference]: Without dead ends: 66 [2020-09-21 10:28:20,612 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-09-21 10:28:20,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-09-21 10:28:20,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-09-21 10:28:20,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-09-21 10:28:20,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-09-21 10:28:20,617 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-09-21 10:28:20,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:20,618 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-09-21 10:28:20,618 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-09-21 10:28:20,618 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-09-21 10:28:20,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-09-21 10:28:20,619 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:20,619 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:20,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-09-21 10:28:20,619 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:20,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:20,619 INFO L82 PathProgramCache]: Analyzing trace with hash 1123081544, now seen corresponding path program 9 times [2020-09-21 10:28:20,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:20,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [558069440] [2020-09-21 10:28:20,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:20,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:20,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:20,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:20,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:20,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:21,715 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:21,715 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [558069440] [2020-09-21 10:28:21,715 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:21,716 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-09-21 10:28:21,716 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501777034] [2020-09-21 10:28:21,716 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-09-21 10:28:21,716 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:21,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-09-21 10:28:21,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-09-21 10:28:21,717 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-09-21 10:28:22,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:22,086 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-09-21 10:28:22,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-09-21 10:28:22,089 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-09-21 10:28:22,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:22,090 INFO L225 Difference]: With dead ends: 90 [2020-09-21 10:28:22,091 INFO L226 Difference]: Without dead ends: 68 [2020-09-21 10:28:22,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-09-21 10:28:22,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-09-21 10:28:22,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-09-21 10:28:22,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-09-21 10:28:22,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-09-21 10:28:22,098 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-09-21 10:28:22,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:22,099 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-09-21 10:28:22,099 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-09-21 10:28:22,099 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-09-21 10:28:22,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-09-21 10:28:22,100 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:22,100 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:22,100 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-09-21 10:28:22,100 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:22,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:22,101 INFO L82 PathProgramCache]: Analyzing trace with hash 1640717386, now seen corresponding path program 10 times [2020-09-21 10:28:22,101 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:22,101 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1637997763] [2020-09-21 10:28:22,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:22,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:22,180 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:22,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:22,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:22,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:23,259 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:23,260 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1637997763] [2020-09-21 10:28:23,260 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:23,260 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-09-21 10:28:23,260 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229949420] [2020-09-21 10:28:23,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-09-21 10:28:23,261 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:23,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-09-21 10:28:23,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-09-21 10:28:23,262 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-09-21 10:28:23,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:23,566 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-09-21 10:28:23,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-09-21 10:28:23,566 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-09-21 10:28:23,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:23,567 INFO L225 Difference]: With dead ends: 92 [2020-09-21 10:28:23,567 INFO L226 Difference]: Without dead ends: 70 [2020-09-21 10:28:23,568 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-09-21 10:28:23,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-09-21 10:28:23,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-09-21 10:28:23,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-09-21 10:28:23,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-09-21 10:28:23,573 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-09-21 10:28:23,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:23,573 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-09-21 10:28:23,573 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-09-21 10:28:23,573 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-09-21 10:28:23,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-09-21 10:28:23,574 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:23,574 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:23,574 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-09-21 10:28:23,575 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:23,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:23,575 INFO L82 PathProgramCache]: Analyzing trace with hash 872555212, now seen corresponding path program 11 times [2020-09-21 10:28:23,575 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:23,575 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2048309787] [2020-09-21 10:28:23,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:23,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:23,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:23,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:23,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:23,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:24,754 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:24,755 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2048309787] [2020-09-21 10:28:24,755 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:24,755 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-09-21 10:28:24,756 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838967272] [2020-09-21 10:28:24,756 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-09-21 10:28:24,756 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:24,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-09-21 10:28:24,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-09-21 10:28:24,757 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-09-21 10:28:25,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:25,138 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-09-21 10:28:25,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-09-21 10:28:25,139 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-09-21 10:28:25,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:25,140 INFO L225 Difference]: With dead ends: 94 [2020-09-21 10:28:25,140 INFO L226 Difference]: Without dead ends: 72 [2020-09-21 10:28:25,141 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-09-21 10:28:25,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-09-21 10:28:25,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-09-21 10:28:25,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-09-21 10:28:25,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-09-21 10:28:25,149 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-09-21 10:28:25,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:25,149 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-09-21 10:28:25,149 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-09-21 10:28:25,149 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-09-21 10:28:25,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-09-21 10:28:25,150 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:25,150 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:25,153 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-09-21 10:28:25,156 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:25,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:25,156 INFO L82 PathProgramCache]: Analyzing trace with hash 1403080910, now seen corresponding path program 12 times [2020-09-21 10:28:25,157 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:25,157 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1285325602] [2020-09-21 10:28:25,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:25,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:25,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:25,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:25,256 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:25,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:26,601 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:26,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1285325602] [2020-09-21 10:28:26,602 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:26,602 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-09-21 10:28:26,602 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523568006] [2020-09-21 10:28:26,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-09-21 10:28:26,603 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:26,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-09-21 10:28:26,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-09-21 10:28:26,604 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-09-21 10:28:27,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:27,012 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-09-21 10:28:27,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-09-21 10:28:27,012 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-09-21 10:28:27,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:27,013 INFO L225 Difference]: With dead ends: 96 [2020-09-21 10:28:27,013 INFO L226 Difference]: Without dead ends: 74 [2020-09-21 10:28:27,014 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-09-21 10:28:27,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-09-21 10:28:27,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-09-21 10:28:27,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-09-21 10:28:27,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-09-21 10:28:27,018 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-09-21 10:28:27,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:27,019 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-09-21 10:28:27,019 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-09-21 10:28:27,019 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-09-21 10:28:27,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-09-21 10:28:27,020 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:27,020 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:27,020 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-09-21 10:28:27,020 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:27,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:27,021 INFO L82 PathProgramCache]: Analyzing trace with hash 137168464, now seen corresponding path program 13 times [2020-09-21 10:28:27,021 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:27,021 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1909532715] [2020-09-21 10:28:27,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:27,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:27,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:27,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:27,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:27,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:28,348 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:28,348 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1909532715] [2020-09-21 10:28:28,348 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:28,348 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-09-21 10:28:28,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089769018] [2020-09-21 10:28:28,349 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-09-21 10:28:28,349 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:28,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-09-21 10:28:28,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-09-21 10:28:28,350 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-09-21 10:28:28,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:28,636 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-09-21 10:28:28,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-09-21 10:28:28,636 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-09-21 10:28:28,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:28,637 INFO L225 Difference]: With dead ends: 98 [2020-09-21 10:28:28,638 INFO L226 Difference]: Without dead ends: 76 [2020-09-21 10:28:28,638 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-09-21 10:28:28,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-09-21 10:28:28,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-09-21 10:28:28,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-09-21 10:28:28,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-09-21 10:28:28,643 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-09-21 10:28:28,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:28,644 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-09-21 10:28:28,644 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-09-21 10:28:28,644 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-09-21 10:28:28,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-09-21 10:28:28,645 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:28,645 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:28,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-09-21 10:28:28,646 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:28,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:28,646 INFO L82 PathProgramCache]: Analyzing trace with hash -928947374, now seen corresponding path program 14 times [2020-09-21 10:28:28,646 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:28,646 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1115173733] [2020-09-21 10:28:28,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:28,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:28,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:28,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:28,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:28,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:30,155 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:30,156 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1115173733] [2020-09-21 10:28:30,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:30,156 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-09-21 10:28:30,156 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577546879] [2020-09-21 10:28:30,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-09-21 10:28:30,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:30,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-09-21 10:28:30,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-09-21 10:28:30,157 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-09-21 10:28:30,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:30,552 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-09-21 10:28:30,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-09-21 10:28:30,552 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-09-21 10:28:30,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:30,553 INFO L225 Difference]: With dead ends: 100 [2020-09-21 10:28:30,553 INFO L226 Difference]: Without dead ends: 78 [2020-09-21 10:28:30,555 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-09-21 10:28:30,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-09-21 10:28:30,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-09-21 10:28:30,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-09-21 10:28:30,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-09-21 10:28:30,559 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-09-21 10:28:30,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:30,559 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-09-21 10:28:30,559 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-09-21 10:28:30,559 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-09-21 10:28:30,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-09-21 10:28:30,560 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:30,560 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:30,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-09-21 10:28:30,560 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:30,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:30,561 INFO L82 PathProgramCache]: Analyzing trace with hash 1030916052, now seen corresponding path program 15 times [2020-09-21 10:28:30,561 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:30,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1988997853] [2020-09-21 10:28:30,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:30,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:30,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:30,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:30,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:30,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:32,040 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:32,041 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1988997853] [2020-09-21 10:28:32,041 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:32,041 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-09-21 10:28:32,041 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936549965] [2020-09-21 10:28:32,042 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-09-21 10:28:32,043 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:32,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-09-21 10:28:32,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-09-21 10:28:32,044 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-09-21 10:28:32,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:32,491 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-09-21 10:28:32,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-09-21 10:28:32,492 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-09-21 10:28:32,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:32,493 INFO L225 Difference]: With dead ends: 102 [2020-09-21 10:28:32,493 INFO L226 Difference]: Without dead ends: 80 [2020-09-21 10:28:32,494 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-09-21 10:28:32,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-09-21 10:28:32,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-09-21 10:28:32,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-09-21 10:28:32,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-09-21 10:28:32,500 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-09-21 10:28:32,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:32,500 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-09-21 10:28:32,500 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-09-21 10:28:32,500 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-09-21 10:28:32,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-09-21 10:28:32,501 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:32,501 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:32,501 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-09-21 10:28:32,501 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:32,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:32,501 INFO L82 PathProgramCache]: Analyzing trace with hash -1030974506, now seen corresponding path program 16 times [2020-09-21 10:28:32,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:32,502 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2003891797] [2020-09-21 10:28:32,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:32,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:32,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:32,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:32,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:32,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:34,103 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:34,104 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2003891797] [2020-09-21 10:28:34,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:34,104 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-09-21 10:28:34,105 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519046173] [2020-09-21 10:28:34,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-09-21 10:28:34,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:34,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-09-21 10:28:34,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-09-21 10:28:34,106 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-09-21 10:28:34,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:34,425 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-09-21 10:28:34,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-09-21 10:28:34,426 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-09-21 10:28:34,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:34,426 INFO L225 Difference]: With dead ends: 104 [2020-09-21 10:28:34,427 INFO L226 Difference]: Without dead ends: 82 [2020-09-21 10:28:34,427 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-09-21 10:28:34,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-09-21 10:28:34,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-09-21 10:28:34,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-09-21 10:28:34,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-09-21 10:28:34,432 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-09-21 10:28:34,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:34,432 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-09-21 10:28:34,432 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-09-21 10:28:34,432 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-09-21 10:28:34,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-09-21 10:28:34,433 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:34,433 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:34,433 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-09-21 10:28:34,433 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:34,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:34,434 INFO L82 PathProgramCache]: Analyzing trace with hash 1767090008, now seen corresponding path program 17 times [2020-09-21 10:28:34,434 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:34,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [890027087] [2020-09-21 10:28:34,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:34,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:34,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:34,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:34,541 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:34,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:36,084 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:36,084 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [890027087] [2020-09-21 10:28:36,084 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:36,085 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-09-21 10:28:36,085 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732730568] [2020-09-21 10:28:36,085 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-09-21 10:28:36,085 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:36,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-09-21 10:28:36,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-09-21 10:28:36,086 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-09-21 10:28:36,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:36,606 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-09-21 10:28:36,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-09-21 10:28:36,607 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-09-21 10:28:36,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:36,608 INFO L225 Difference]: With dead ends: 106 [2020-09-21 10:28:36,608 INFO L226 Difference]: Without dead ends: 84 [2020-09-21 10:28:36,609 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-09-21 10:28:36,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-09-21 10:28:36,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-09-21 10:28:36,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-09-21 10:28:36,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-09-21 10:28:36,614 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-09-21 10:28:36,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:36,614 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-09-21 10:28:36,614 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-09-21 10:28:36,614 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-09-21 10:28:36,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-09-21 10:28:36,615 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:36,615 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:36,615 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-09-21 10:28:36,615 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:36,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:36,616 INFO L82 PathProgramCache]: Analyzing trace with hash 2057560666, now seen corresponding path program 18 times [2020-09-21 10:28:36,616 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:36,616 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [96135840] [2020-09-21 10:28:36,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:36,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:36,719 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:36,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:36,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:36,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:38,468 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:38,468 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [96135840] [2020-09-21 10:28:38,468 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:38,469 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-09-21 10:28:38,469 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694287224] [2020-09-21 10:28:38,469 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-09-21 10:28:38,469 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:38,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-09-21 10:28:38,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-09-21 10:28:38,470 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-09-21 10:28:38,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:38,972 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-09-21 10:28:38,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-09-21 10:28:38,973 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-09-21 10:28:38,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:38,974 INFO L225 Difference]: With dead ends: 108 [2020-09-21 10:28:38,974 INFO L226 Difference]: Without dead ends: 86 [2020-09-21 10:28:38,975 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-09-21 10:28:38,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-09-21 10:28:38,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-09-21 10:28:38,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-09-21 10:28:38,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-09-21 10:28:38,980 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-09-21 10:28:38,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:38,981 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-09-21 10:28:38,981 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-09-21 10:28:38,981 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-09-21 10:28:38,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-09-21 10:28:38,981 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:38,982 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:38,982 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-09-21 10:28:38,982 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:38,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:38,982 INFO L82 PathProgramCache]: Analyzing trace with hash 2026988764, now seen corresponding path program 19 times [2020-09-21 10:28:38,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:38,983 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1639095637] [2020-09-21 10:28:38,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:39,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:39,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:39,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:39,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:39,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:40,859 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:40,860 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1639095637] [2020-09-21 10:28:40,860 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:40,860 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-09-21 10:28:40,860 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684852956] [2020-09-21 10:28:40,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-09-21 10:28:40,861 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:40,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-09-21 10:28:40,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-09-21 10:28:40,861 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-09-21 10:28:41,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:41,349 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-09-21 10:28:41,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-09-21 10:28:41,349 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-09-21 10:28:41,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:41,350 INFO L225 Difference]: With dead ends: 110 [2020-09-21 10:28:41,351 INFO L226 Difference]: Without dead ends: 88 [2020-09-21 10:28:41,352 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-09-21 10:28:41,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-09-21 10:28:41,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-09-21 10:28:41,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-09-21 10:28:41,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-09-21 10:28:41,358 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-09-21 10:28:41,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:41,358 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-09-21 10:28:41,358 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-09-21 10:28:41,358 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-09-21 10:28:41,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-09-21 10:28:41,359 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:41,359 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:41,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-09-21 10:28:41,360 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:41,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:41,360 INFO L82 PathProgramCache]: Analyzing trace with hash -1582805282, now seen corresponding path program 20 times [2020-09-21 10:28:41,360 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:41,360 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1875133980] [2020-09-21 10:28:41,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:41,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:41,469 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:41,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:41,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:41,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:43,364 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:43,364 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1875133980] [2020-09-21 10:28:43,365 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:43,365 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-09-21 10:28:43,365 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607561276] [2020-09-21 10:28:43,365 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-09-21 10:28:43,365 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:43,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-09-21 10:28:43,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-09-21 10:28:43,366 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-09-21 10:28:43,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:43,921 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-09-21 10:28:43,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-09-21 10:28:43,922 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-09-21 10:28:43,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:43,923 INFO L225 Difference]: With dead ends: 112 [2020-09-21 10:28:43,923 INFO L226 Difference]: Without dead ends: 90 [2020-09-21 10:28:43,925 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-09-21 10:28:43,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-09-21 10:28:43,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-09-21 10:28:43,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-09-21 10:28:43,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-09-21 10:28:43,929 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-09-21 10:28:43,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:43,930 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-09-21 10:28:43,930 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-09-21 10:28:43,930 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-09-21 10:28:43,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-09-21 10:28:43,930 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:43,931 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:43,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-09-21 10:28:43,931 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:43,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:43,931 INFO L82 PathProgramCache]: Analyzing trace with hash -261308320, now seen corresponding path program 21 times [2020-09-21 10:28:43,932 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:43,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1053290367] [2020-09-21 10:28:43,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:43,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:44,043 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:44,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:44,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:44,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:46,024 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:46,024 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1053290367] [2020-09-21 10:28:46,024 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:46,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-09-21 10:28:46,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337305009] [2020-09-21 10:28:46,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-09-21 10:28:46,025 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:46,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-09-21 10:28:46,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-09-21 10:28:46,026 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-09-21 10:28:46,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:46,583 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-09-21 10:28:46,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-09-21 10:28:46,584 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-09-21 10:28:46,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:46,585 INFO L225 Difference]: With dead ends: 114 [2020-09-21 10:28:46,585 INFO L226 Difference]: Without dead ends: 92 [2020-09-21 10:28:46,586 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-09-21 10:28:46,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-09-21 10:28:46,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-09-21 10:28:46,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-09-21 10:28:46,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-09-21 10:28:46,594 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-09-21 10:28:46,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:46,595 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-09-21 10:28:46,595 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-09-21 10:28:46,595 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-09-21 10:28:46,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-09-21 10:28:46,596 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:46,596 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:46,596 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-09-21 10:28:46,596 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:46,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:46,596 INFO L82 PathProgramCache]: Analyzing trace with hash -1613047454, now seen corresponding path program 22 times [2020-09-21 10:28:46,599 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:46,600 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1755961242] [2020-09-21 10:28:46,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:46,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:46,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:46,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:46,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:46,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:48,857 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:48,858 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1755961242] [2020-09-21 10:28:48,858 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:48,858 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-09-21 10:28:48,858 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429364542] [2020-09-21 10:28:48,859 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-09-21 10:28:48,859 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:48,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-09-21 10:28:48,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-09-21 10:28:48,860 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-09-21 10:28:49,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:49,297 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-09-21 10:28:49,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-09-21 10:28:49,298 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-09-21 10:28:49,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:49,299 INFO L225 Difference]: With dead ends: 116 [2020-09-21 10:28:49,299 INFO L226 Difference]: Without dead ends: 94 [2020-09-21 10:28:49,300 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-09-21 10:28:49,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-09-21 10:28:49,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-09-21 10:28:49,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-09-21 10:28:49,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-09-21 10:28:49,305 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-09-21 10:28:49,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:49,305 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-09-21 10:28:49,306 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-09-21 10:28:49,306 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-09-21 10:28:49,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-09-21 10:28:49,306 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:49,307 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:49,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-09-21 10:28:49,307 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:49,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:49,307 INFO L82 PathProgramCache]: Analyzing trace with hash 740735460, now seen corresponding path program 23 times [2020-09-21 10:28:49,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:49,308 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1801767349] [2020-09-21 10:28:49,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:49,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:49,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:49,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:49,437 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:49,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:51,681 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:51,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1801767349] [2020-09-21 10:28:51,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:51,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-09-21 10:28:51,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276993731] [2020-09-21 10:28:51,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-09-21 10:28:51,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:51,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-09-21 10:28:51,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-09-21 10:28:51,684 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-09-21 10:28:52,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:52,288 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-09-21 10:28:52,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-09-21 10:28:52,289 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-09-21 10:28:52,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:52,290 INFO L225 Difference]: With dead ends: 118 [2020-09-21 10:28:52,290 INFO L226 Difference]: Without dead ends: 96 [2020-09-21 10:28:52,291 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-09-21 10:28:52,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-09-21 10:28:52,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-09-21 10:28:52,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-09-21 10:28:52,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-09-21 10:28:52,295 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-09-21 10:28:52,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:52,296 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-09-21 10:28:52,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-09-21 10:28:52,296 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-09-21 10:28:52,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-09-21 10:28:52,297 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:52,297 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:52,297 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-09-21 10:28:52,297 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:52,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:52,298 INFO L82 PathProgramCache]: Analyzing trace with hash -721649178, now seen corresponding path program 24 times [2020-09-21 10:28:52,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:52,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [370462030] [2020-09-21 10:28:52,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:52,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:52,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:52,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:52,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:52,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:54,743 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:54,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [370462030] [2020-09-21 10:28:54,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:54,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-09-21 10:28:54,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456537263] [2020-09-21 10:28:54,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-09-21 10:28:54,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:54,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-09-21 10:28:54,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-09-21 10:28:54,746 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-09-21 10:28:55,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:55,252 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-09-21 10:28:55,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-09-21 10:28:55,253 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-09-21 10:28:55,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:55,254 INFO L225 Difference]: With dead ends: 120 [2020-09-21 10:28:55,254 INFO L226 Difference]: Without dead ends: 98 [2020-09-21 10:28:55,254 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-09-21 10:28:55,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-09-21 10:28:55,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-09-21 10:28:55,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-09-21 10:28:55,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-09-21 10:28:55,258 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-09-21 10:28:55,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:55,259 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-09-21 10:28:55,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-09-21 10:28:55,259 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-09-21 10:28:55,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-09-21 10:28:55,260 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:55,260 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:55,260 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-09-21 10:28:55,260 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:55,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:55,261 INFO L82 PathProgramCache]: Analyzing trace with hash -1618980504, now seen corresponding path program 25 times [2020-09-21 10:28:55,261 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:55,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1507532387] [2020-09-21 10:28:55,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:55,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:55,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:55,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:55,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:55,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:57,865 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-09-21 10:28:57,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1507532387] [2020-09-21 10:28:57,865 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:57,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-09-21 10:28:57,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545099109] [2020-09-21 10:28:57,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-09-21 10:28:57,866 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:57,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-09-21 10:28:57,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-09-21 10:28:57,868 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-09-21 10:28:58,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:58,279 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-09-21 10:28:58,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-09-21 10:28:58,279 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-09-21 10:28:58,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:58,281 INFO L225 Difference]: With dead ends: 122 [2020-09-21 10:28:58,281 INFO L226 Difference]: Without dead ends: 100 [2020-09-21 10:28:58,282 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-09-21 10:28:58,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-09-21 10:28:58,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-09-21 10:28:58,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-09-21 10:28:58,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-09-21 10:28:58,289 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-09-21 10:28:58,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:58,290 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-09-21 10:28:58,290 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-09-21 10:28:58,290 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-09-21 10:28:58,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-09-21 10:28:58,290 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:58,291 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:58,291 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-09-21 10:28:58,291 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:58,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:58,291 INFO L82 PathProgramCache]: Analyzing trace with hash -665958294, now seen corresponding path program 26 times [2020-09-21 10:28:58,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:58,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [499059215] [2020-09-21 10:28:58,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:58,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:58,399 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:58,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:58,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-21 10:28:58,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat