/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.2 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/sum01-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 23:06:29,320 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 23:06:29,323 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 23:06:29,346 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 23:06:29,346 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 23:06:29,347 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 23:06:29,348 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 23:06:29,350 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 23:06:29,352 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 23:06:29,352 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 23:06:29,353 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 23:06:29,354 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 23:06:29,355 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 23:06:29,355 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 23:06:29,356 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 23:06:29,357 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 23:06:29,358 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 23:06:29,359 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 23:06:29,360 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 23:06:29,362 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 23:06:29,364 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 23:06:29,364 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 23:06:29,365 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 23:06:29,366 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 23:06:29,368 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 23:06:29,369 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 23:06:29,369 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 23:06:29,370 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 23:06:29,370 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 23:06:29,371 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 23:06:29,371 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 23:06:29,372 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 23:06:29,372 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 23:06:29,373 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 23:06:29,374 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 23:06:29,374 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 23:06:29,375 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 23:06:29,375 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 23:06:29,375 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 23:06:29,376 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 23:06:29,377 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 23:06:29,378 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 23:06:29,412 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 23:06:29,412 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 23:06:29,413 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 23:06:29,414 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 23:06:29,414 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 23:06:29,414 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 23:06:29,414 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 23:06:29,414 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 23:06:29,415 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 23:06:29,415 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 23:06:29,415 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 23:06:29,415 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 23:06:29,415 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 23:06:29,416 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 23:06:29,416 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 23:06:29,416 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 23:06:29,416 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 23:06:29,416 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 23:06:29,417 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 23:06:29,417 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 23:06:29,417 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 23:06:29,417 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 23:06:29,417 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 23:06:29,418 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 23:06:29,418 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 23:06:29,418 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 23:06:29,418 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 23:06:29,418 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 23:06:29,419 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 23:06:29,419 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.2;log-additional-information=true; [2020-08-21 23:06:29,707 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 23:06:29,727 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 23:06:29,732 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 23:06:29,733 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 23:06:29,734 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 23:06:29,734 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01-1.i [2020-08-21 23:06:29,802 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bd68b4343/6fdcd7ec536d4a939063dc9d3d246f0f/FLAG104272225 [2020-08-21 23:06:30,212 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 23:06:30,213 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/sum01-1.i [2020-08-21 23:06:30,219 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bd68b4343/6fdcd7ec536d4a939063dc9d3d246f0f/FLAG104272225 [2020-08-21 23:06:30,591 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bd68b4343/6fdcd7ec536d4a939063dc9d3d246f0f [2020-08-21 23:06:30,599 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 23:06:30,601 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 23:06:30,602 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 23:06:30,602 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 23:06:30,606 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 23:06:30,607 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 11:06:30" (1/1) ... [2020-08-21 23:06:30,610 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@656a7a3a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:30, skipping insertion in model container [2020-08-21 23:06:30,610 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 11:06:30" (1/1) ... [2020-08-21 23:06:30,617 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 23:06:30,636 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 23:06:30,817 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 23:06:30,821 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 23:06:30,835 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 23:06:30,849 INFO L208 MainTranslator]: Completed translation [2020-08-21 23:06:30,849 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:30 WrapperNode [2020-08-21 23:06:30,850 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 23:06:30,850 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 23:06:30,850 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 23:06:30,851 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 23:06:30,863 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:30" (1/1) ... [2020-08-21 23:06:30,864 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:30" (1/1) ... [2020-08-21 23:06:30,868 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:30" (1/1) ... [2020-08-21 23:06:30,869 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:30" (1/1) ... [2020-08-21 23:06:30,954 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:30" (1/1) ... [2020-08-21 23:06:30,960 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:30" (1/1) ... [2020-08-21 23:06:30,961 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:30" (1/1) ... [2020-08-21 23:06:30,962 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 23:06:30,963 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 23:06:30,963 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 23:06:30,963 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 23:06:30,964 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:30" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 23:06:31,019 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 23:06:31,020 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 23:06:31,020 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 23:06:31,020 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 23:06:31,020 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 23:06:31,020 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 23:06:31,020 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-21 23:06:31,021 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 23:06:31,021 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 23:06:31,021 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 23:06:31,197 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 23:06:31,197 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 23:06:31,200 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 11:06:31 BoogieIcfgContainer [2020-08-21 23:06:31,201 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 23:06:31,202 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 23:06:31,202 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 23:06:31,205 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 23:06:31,205 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 11:06:30" (1/3) ... [2020-08-21 23:06:31,206 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e306cee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 11:06:31, skipping insertion in model container [2020-08-21 23:06:31,206 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:06:30" (2/3) ... [2020-08-21 23:06:31,206 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e306cee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 11:06:31, skipping insertion in model container [2020-08-21 23:06:31,207 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 11:06:31" (3/3) ... [2020-08-21 23:06:31,208 INFO L109 eAbstractionObserver]: Analyzing ICFG sum01-1.i [2020-08-21 23:06:31,218 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 23:06:31,225 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 23:06:31,238 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 23:06:31,258 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 23:06:31,258 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 23:06:31,258 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 23:06:31,259 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 23:06:31,259 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 23:06:31,259 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 23:06:31,259 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 23:06:31,259 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 23:06:31,274 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-21 23:06:31,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 23:06:31,279 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:31,279 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:31,280 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:31,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:31,284 INFO L82 PathProgramCache]: Analyzing trace with hash -721501374, now seen corresponding path program 1 times [2020-08-21 23:06:31,291 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:31,291 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1244921421] [2020-08-21 23:06:31,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:31,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:31,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:31,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:31,409 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:31,410 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1244921421] [2020-08-21 23:06:31,412 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:06:31,412 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-21 23:06:31,413 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570004532] [2020-08-21 23:06:31,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-21 23:06:31,418 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:31,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-21 23:06:31,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 23:06:31,435 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2020-08-21 23:06:31,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:31,457 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-21 23:06:31,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-21 23:06:31,458 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-21 23:06:31,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:31,466 INFO L225 Difference]: With dead ends: 30 [2020-08-21 23:06:31,466 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 23:06:31,469 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 23:06:31,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 23:06:31,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 23:06:31,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 23:06:31,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-08-21 23:06:31,506 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-08-21 23:06:31,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:31,506 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-08-21 23:06:31,507 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-21 23:06:31,507 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-08-21 23:06:31,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 23:06:31,508 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:31,508 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:31,508 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 23:06:31,508 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:31,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:31,509 INFO L82 PathProgramCache]: Analyzing trace with hash -731660105, now seen corresponding path program 1 times [2020-08-21 23:06:31,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:31,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [305315156] [2020-08-21 23:06:31,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:31,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:31,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:31,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:31,600 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:31,601 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [305315156] [2020-08-21 23:06:31,601 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:06:31,602 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 23:06:31,602 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095247094] [2020-08-21 23:06:31,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 23:06:31,604 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:31,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 23:06:31,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 23:06:31,605 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 5 states. [2020-08-21 23:06:31,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:31,649 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-08-21 23:06:31,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 23:06:31,650 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-08-21 23:06:31,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:31,651 INFO L225 Difference]: With dead ends: 21 [2020-08-21 23:06:31,651 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 23:06:31,652 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 23:06:31,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 23:06:31,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 23:06:31,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 23:06:31,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-21 23:06:31,657 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 10 [2020-08-21 23:06:31,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:31,658 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-21 23:06:31,658 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 23:06:31,658 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-21 23:06:31,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 23:06:31,660 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:31,660 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:31,661 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 23:06:31,661 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:31,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:31,661 INFO L82 PathProgramCache]: Analyzing trace with hash -1637338477, now seen corresponding path program 1 times [2020-08-21 23:06:31,662 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:31,662 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1815730997] [2020-08-21 23:06:31,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:31,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:31,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:31,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:31,940 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:31,940 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1815730997] [2020-08-21 23:06:31,941 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:31,943 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 23:06:31,944 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723689696] [2020-08-21 23:06:31,944 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 23:06:31,945 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:31,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 23:06:31,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-08-21 23:06:31,946 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 9 states. [2020-08-21 23:06:32,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:32,073 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2020-08-21 23:06:32,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 23:06:32,073 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 13 [2020-08-21 23:06:32,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:32,076 INFO L225 Difference]: With dead ends: 28 [2020-08-21 23:06:32,076 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 23:06:32,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-08-21 23:06:32,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 23:06:32,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-21 23:06:32,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 23:06:32,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2020-08-21 23:06:32,085 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 13 [2020-08-21 23:06:32,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:32,086 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2020-08-21 23:06:32,086 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 23:06:32,086 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2020-08-21 23:06:32,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 23:06:32,087 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:32,087 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:32,088 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 23:06:32,088 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:32,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:32,088 INFO L82 PathProgramCache]: Analyzing trace with hash -2110192267, now seen corresponding path program 1 times [2020-08-21 23:06:32,089 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:32,089 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1116442566] [2020-08-21 23:06:32,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:32,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:32,132 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:32,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:32,141 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-21 23:06:32,142 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1116442566] [2020-08-21 23:06:32,142 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:06:32,142 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 23:06:32,142 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938785927] [2020-08-21 23:06:32,145 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 23:06:32,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:32,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 23:06:32,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 23:06:32,146 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand 3 states. [2020-08-21 23:06:32,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:32,173 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2020-08-21 23:06:32,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 23:06:32,175 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-08-21 23:06:32,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:32,176 INFO L225 Difference]: With dead ends: 28 [2020-08-21 23:06:32,176 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 23:06:32,176 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 23:06:32,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 23:06:32,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 23:06:32,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 23:06:32,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-21 23:06:32,188 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 16 [2020-08-21 23:06:32,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:32,189 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-21 23:06:32,189 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 23:06:32,189 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-21 23:06:32,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 23:06:32,191 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:32,191 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:32,192 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 23:06:32,192 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:32,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:32,193 INFO L82 PathProgramCache]: Analyzing trace with hash 57842105, now seen corresponding path program 2 times [2020-08-21 23:06:32,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:32,194 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1799452556] [2020-08-21 23:06:32,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:32,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:32,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:32,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:32,236 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:32,237 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1799452556] [2020-08-21 23:06:32,237 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:32,237 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 23:06:32,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887715764] [2020-08-21 23:06:32,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 23:06:32,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:32,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 23:06:32,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 23:06:32,239 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-21 23:06:32,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:32,263 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2020-08-21 23:06:32,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 23:06:32,264 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-21 23:06:32,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:32,265 INFO L225 Difference]: With dead ends: 27 [2020-08-21 23:06:32,265 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 23:06:32,266 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 23:06:32,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 23:06:32,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2020-08-21 23:06:32,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 23:06:32,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-21 23:06:32,271 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 16 [2020-08-21 23:06:32,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:32,271 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-21 23:06:32,271 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 23:06:32,272 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-21 23:06:32,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 23:06:32,272 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:32,273 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:32,273 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 23:06:32,273 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:32,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:32,274 INFO L82 PathProgramCache]: Analyzing trace with hash -1717165257, now seen corresponding path program 2 times [2020-08-21 23:06:32,274 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:32,274 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1814656004] [2020-08-21 23:06:32,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:32,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:32,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:32,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:32,486 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 23:06:32,486 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1814656004] [2020-08-21 23:06:32,487 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:32,487 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 23:06:32,487 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802563974] [2020-08-21 23:06:32,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 23:06:32,488 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:32,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 23:06:32,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-08-21 23:06:32,489 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 10 states. [2020-08-21 23:06:32,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:32,650 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2020-08-21 23:06:32,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 23:06:32,651 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 16 [2020-08-21 23:06:32,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:32,652 INFO L225 Difference]: With dead ends: 27 [2020-08-21 23:06:32,652 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 23:06:32,653 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2020-08-21 23:06:32,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 23:06:32,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-21 23:06:32,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 23:06:32,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-08-21 23:06:32,658 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 16 [2020-08-21 23:06:32,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:32,658 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-08-21 23:06:32,659 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 23:06:32,659 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-08-21 23:06:32,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 23:06:32,659 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:32,660 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:32,660 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 23:06:32,660 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:32,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:32,661 INFO L82 PathProgramCache]: Analyzing trace with hash 1350121109, now seen corresponding path program 3 times [2020-08-21 23:06:32,661 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:32,661 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [968207424] [2020-08-21 23:06:32,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:32,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:32,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:32,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:32,704 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:32,705 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [968207424] [2020-08-21 23:06:32,705 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:32,705 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 23:06:32,705 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184076989] [2020-08-21 23:06:32,706 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 23:06:32,706 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:32,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 23:06:32,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-21 23:06:32,707 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 5 states. [2020-08-21 23:06:32,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:32,735 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2020-08-21 23:06:32,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 23:06:32,735 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-08-21 23:06:32,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:32,736 INFO L225 Difference]: With dead ends: 33 [2020-08-21 23:06:32,737 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 23:06:32,737 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-21 23:06:32,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 23:06:32,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2020-08-21 23:06:32,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 23:06:32,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-21 23:06:32,743 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 19 [2020-08-21 23:06:32,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:32,743 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-21 23:06:32,743 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 23:06:32,744 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-21 23:06:32,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 23:06:32,744 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:32,745 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:32,745 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 23:06:32,745 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:32,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:32,746 INFO L82 PathProgramCache]: Analyzing trace with hash -452912071, now seen corresponding path program 4 times [2020-08-21 23:06:32,746 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:32,746 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [200865350] [2020-08-21 23:06:32,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:32,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:32,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:32,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:32,792 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:32,793 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [200865350] [2020-08-21 23:06:32,793 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:32,793 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 23:06:32,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167743920] [2020-08-21 23:06:32,794 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 23:06:32,794 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:32,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 23:06:32,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-21 23:06:32,795 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 6 states. [2020-08-21 23:06:32,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:32,827 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-08-21 23:06:32,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 23:06:32,828 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-21 23:06:32,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:32,828 INFO L225 Difference]: With dead ends: 36 [2020-08-21 23:06:32,829 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 23:06:32,829 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-21 23:06:32,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 23:06:32,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-21 23:06:32,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 23:06:32,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-08-21 23:06:32,835 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 22 [2020-08-21 23:06:32,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:32,835 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-08-21 23:06:32,835 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 23:06:32,835 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-08-21 23:06:32,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 23:06:32,836 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:32,836 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:32,837 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 23:06:32,837 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:32,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:32,837 INFO L82 PathProgramCache]: Analyzing trace with hash -1753373675, now seen corresponding path program 5 times [2020-08-21 23:06:32,838 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:32,838 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [794271827] [2020-08-21 23:06:32,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:32,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:32,900 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:32,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:32,904 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:32,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [794271827] [2020-08-21 23:06:32,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:32,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 23:06:32,906 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967616403] [2020-08-21 23:06:32,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 23:06:32,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:32,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 23:06:32,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-08-21 23:06:32,907 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 7 states. [2020-08-21 23:06:32,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:32,958 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2020-08-21 23:06:32,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 23:06:32,959 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-08-21 23:06:32,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:32,960 INFO L225 Difference]: With dead ends: 39 [2020-08-21 23:06:32,960 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 23:06:32,960 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-08-21 23:06:32,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 23:06:32,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2020-08-21 23:06:32,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 23:06:32,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-21 23:06:32,973 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 25 [2020-08-21 23:06:32,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:32,973 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-21 23:06:32,973 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 23:06:32,974 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-21 23:06:32,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 23:06:32,974 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:32,974 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:32,976 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 23:06:32,976 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:32,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:32,976 INFO L82 PathProgramCache]: Analyzing trace with hash 1094958777, now seen corresponding path program 6 times [2020-08-21 23:06:32,977 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:32,979 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1148032057] [2020-08-21 23:06:32,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:32,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:33,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:33,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:33,064 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:33,065 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1148032057] [2020-08-21 23:06:33,065 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:33,065 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 23:06:33,065 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125368705] [2020-08-21 23:06:33,066 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 23:06:33,066 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:33,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 23:06:33,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-08-21 23:06:33,067 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 8 states. [2020-08-21 23:06:33,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:33,106 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-08-21 23:06:33,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 23:06:33,107 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 28 [2020-08-21 23:06:33,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:33,108 INFO L225 Difference]: With dead ends: 42 [2020-08-21 23:06:33,108 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 23:06:33,109 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-08-21 23:06:33,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 23:06:33,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 23:06:33,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 23:06:33,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2020-08-21 23:06:33,115 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 28 [2020-08-21 23:06:33,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:33,115 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2020-08-21 23:06:33,115 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 23:06:33,116 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2020-08-21 23:06:33,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 23:06:33,116 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:33,117 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:33,117 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 23:06:33,117 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:33,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:33,118 INFO L82 PathProgramCache]: Analyzing trace with hash 98169237, now seen corresponding path program 7 times [2020-08-21 23:06:33,118 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:33,118 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1250518623] [2020-08-21 23:06:33,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:33,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:33,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:33,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:33,195 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:33,195 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1250518623] [2020-08-21 23:06:33,196 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:33,196 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 23:06:33,196 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190940009] [2020-08-21 23:06:33,197 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 23:06:33,197 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:33,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 23:06:33,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-08-21 23:06:33,198 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 9 states. [2020-08-21 23:06:33,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:33,245 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2020-08-21 23:06:33,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 23:06:33,246 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-08-21 23:06:33,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:33,247 INFO L225 Difference]: With dead ends: 45 [2020-08-21 23:06:33,247 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 23:06:33,247 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-08-21 23:06:33,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 23:06:33,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2020-08-21 23:06:33,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 23:06:33,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-21 23:06:33,253 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 31 [2020-08-21 23:06:33,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:33,254 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-21 23:06:33,254 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 23:06:33,254 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-21 23:06:33,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 23:06:33,255 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:33,255 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:33,255 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 23:06:33,256 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:33,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:33,256 INFO L82 PathProgramCache]: Analyzing trace with hash 144867641, now seen corresponding path program 8 times [2020-08-21 23:06:33,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:33,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [426459818] [2020-08-21 23:06:33,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:33,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:33,345 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:33,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:33,349 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 15 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:33,349 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [426459818] [2020-08-21 23:06:33,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:33,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 23:06:33,350 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651173546] [2020-08-21 23:06:33,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 23:06:33,350 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:33,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 23:06:33,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-08-21 23:06:33,351 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 10 states. [2020-08-21 23:06:33,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:33,404 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2020-08-21 23:06:33,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 23:06:33,404 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 34 [2020-08-21 23:06:33,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:33,405 INFO L225 Difference]: With dead ends: 48 [2020-08-21 23:06:33,405 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 23:06:33,406 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-08-21 23:06:33,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 23:06:33,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 23:06:33,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 23:06:33,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2020-08-21 23:06:33,411 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 34 [2020-08-21 23:06:33,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:33,412 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2020-08-21 23:06:33,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 23:06:33,412 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2020-08-21 23:06:33,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 23:06:33,413 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:33,413 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:33,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 23:06:33,414 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:33,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:33,414 INFO L82 PathProgramCache]: Analyzing trace with hash -232382699, now seen corresponding path program 9 times [2020-08-21 23:06:33,414 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:33,414 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2049598470] [2020-08-21 23:06:33,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:33,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:33,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:06:33,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:06:33,503 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 17 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:06:33,504 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2049598470] [2020-08-21 23:06:33,504 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:06:33,504 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 23:06:33,504 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684721798] [2020-08-21 23:06:33,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 23:06:33,505 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:06:33,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 23:06:33,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-08-21 23:06:33,506 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 11 states. [2020-08-21 23:06:33,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:06:33,568 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2020-08-21 23:06:33,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 23:06:33,568 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 37 [2020-08-21 23:06:33,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:06:33,569 INFO L225 Difference]: With dead ends: 51 [2020-08-21 23:06:33,569 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 23:06:33,570 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-08-21 23:06:33,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 23:06:33,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2020-08-21 23:06:33,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 23:06:33,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-21 23:06:33,581 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 37 [2020-08-21 23:06:33,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:06:33,582 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-21 23:06:33,582 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 23:06:33,582 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-21 23:06:33,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 23:06:33,583 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:06:33,583 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:06:33,583 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 23:06:33,584 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:06:33,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:06:33,584 INFO L82 PathProgramCache]: Analyzing trace with hash 1032151993, now seen corresponding path program 10 times [2020-08-21 23:06:33,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:06:33,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [142982551] [2020-08-21 23:06:33,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:06:33,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 23:06:33,619 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 23:06:33,620 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 23:06:33,623 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 23:06:33,647 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 11:06:33 BoogieIcfgContainer [2020-08-21 23:06:33,647 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 23:06:33,651 INFO L168 Benchmark]: Toolchain (without parser) took 3047.82 ms. Allocated memory was 146.3 MB in the beginning and 245.9 MB in the end (delta: 99.6 MB). Free memory was 102.3 MB in the beginning and 177.6 MB in the end (delta: -75.3 MB). Peak memory consumption was 24.3 MB. Max. memory is 7.1 GB. [2020-08-21 23:06:33,652 INFO L168 Benchmark]: CDTParser took 0.70 ms. Allocated memory is still 146.3 MB. Free memory was 120.8 MB in the beginning and 120.6 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-08-21 23:06:33,653 INFO L168 Benchmark]: CACSL2BoogieTranslator took 247.66 ms. Allocated memory is still 146.3 MB. Free memory was 102.1 MB in the beginning and 92.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-08-21 23:06:33,654 INFO L168 Benchmark]: Boogie Preprocessor took 112.35 ms. Allocated memory was 146.3 MB in the beginning and 201.9 MB in the end (delta: 55.6 MB). Free memory was 92.8 MB in the beginning and 180.8 MB in the end (delta: -88.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-08-21 23:06:33,658 INFO L168 Benchmark]: RCFGBuilder took 237.72 ms. Allocated memory is still 201.9 MB. Free memory was 180.8 MB in the beginning and 168.5 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. [2020-08-21 23:06:33,663 INFO L168 Benchmark]: TraceAbstraction took 2445.40 ms. Allocated memory was 201.9 MB in the beginning and 245.9 MB in the end (delta: 44.0 MB). Free memory was 167.9 MB in the beginning and 177.6 MB in the end (delta: -9.7 MB). Peak memory consumption was 34.3 MB. Max. memory is 7.1 GB. [2020-08-21 23:06:33,669 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.70 ms. Allocated memory is still 146.3 MB. Free memory was 120.8 MB in the beginning and 120.6 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 247.66 ms. Allocated memory is still 146.3 MB. Free memory was 102.1 MB in the beginning and 92.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 112.35 ms. Allocated memory was 146.3 MB in the beginning and 201.9 MB in the end (delta: 55.6 MB). Free memory was 92.8 MB in the beginning and 180.8 MB in the end (delta: -88.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 237.72 ms. Allocated memory is still 201.9 MB. Free memory was 180.8 MB in the beginning and 168.5 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2445.40 ms. Allocated memory was 201.9 MB in the beginning and 245.9 MB in the end (delta: 44.0 MB). Free memory was 167.9 MB in the beginning and 177.6 MB in the end (delta: -9.7 MB). Peak memory consumption was 34.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int i, n=__VERIFIER_nondet_uint(), sn=0; [L12] int i, n=__VERIFIER_nondet_uint(), sn=0; [L13] i=1 [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ [L13] COND TRUE i<=n [L14] COND FALSE !(i<10) [L13] i++ [L13] COND FALSE !(i<=n) [L17] CALL __VERIFIER_assert(sn==n*(2) || sn == 0) [L4] COND TRUE !(cond) [L5] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.3s, OverallIterations: 14, TraceHistogramMax: 10, AutomataDifference: 0.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 147 SDtfs, 59 SDslu, 484 SDs, 0 SdLazy, 391 SolverSat, 15 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 124 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=42occurred in iteration=13, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 13 MinimizatonAttempts, 12 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.0s InterpolantComputationTime, 317 NumberOfCodeBlocks, 317 NumberOfCodeBlocksAsserted, 14 NumberOfCheckSat, 264 ConstructedInterpolants, 0 QuantifiedInterpolants, 16404 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 13 InterpolantComputations, 3 PerfectInterpolantSequences, 86/415 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...