/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/loop-simple/nested_4.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-178dd20 [2021-01-06 17:08:58,246 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-01-06 17:08:58,249 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-01-06 17:08:58,307 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-01-06 17:08:58,308 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-01-06 17:08:58,312 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-01-06 17:08:58,317 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-01-06 17:08:58,323 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-01-06 17:08:58,326 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-01-06 17:08:58,333 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-01-06 17:08:58,337 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-01-06 17:08:58,338 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-01-06 17:08:58,339 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-01-06 17:08:58,342 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-01-06 17:08:58,345 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-01-06 17:08:58,347 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-01-06 17:08:58,363 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-01-06 17:08:58,366 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-01-06 17:08:58,374 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-01-06 17:08:58,382 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-01-06 17:08:58,384 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-01-06 17:08:58,387 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-01-06 17:08:58,388 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-01-06 17:08:58,391 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-01-06 17:08:58,400 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-01-06 17:08:58,406 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-01-06 17:08:58,407 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-01-06 17:08:58,410 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-01-06 17:08:58,410 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-01-06 17:08:58,412 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-01-06 17:08:58,412 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-01-06 17:08:58,413 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-01-06 17:08:58,421 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-01-06 17:08:58,421 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-01-06 17:08:58,423 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-01-06 17:08:58,424 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-01-06 17:08:58,430 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2021-01-06 17:08:58,478 INFO L113 SettingsManager]: Loading preferences was successful [2021-01-06 17:08:58,478 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-01-06 17:08:58,482 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-01-06 17:08:58,483 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-01-06 17:08:58,483 INFO L138 SettingsManager]: * Use SBE=true [2021-01-06 17:08:58,483 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-01-06 17:08:58,484 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-01-06 17:08:58,484 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-01-06 17:08:58,484 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-01-06 17:08:58,484 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-01-06 17:08:58,485 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-01-06 17:08:58,486 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-01-06 17:08:58,486 INFO L138 SettingsManager]: * Use constant arrays=true [2021-01-06 17:08:58,487 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-01-06 17:08:58,487 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-01-06 17:08:58,487 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-01-06 17:08:58,487 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-01-06 17:08:58,488 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 17:08:58,488 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-01-06 17:08:58,488 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-01-06 17:08:58,488 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-01-06 17:08:58,489 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-01-06 17:08:58,489 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-01-06 17:08:58,489 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-01-06 17:08:58,489 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-01-06 17:08:58,490 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-01-06 17:08:58,945 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-01-06 17:08:58,980 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-01-06 17:08:58,984 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-01-06 17:08:58,986 INFO L271 PluginConnector]: Initializing CDTParser... [2021-01-06 17:08:58,987 INFO L275 PluginConnector]: CDTParser initialized [2021-01-06 17:08:58,988 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-simple/nested_4.c [2021-01-06 17:08:59,087 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/20971aee0/d982a9a613254694ac7433f11b16063e/FLAGac411a3c1 [2021-01-06 17:08:59,697 INFO L306 CDTParser]: Found 1 translation units. [2021-01-06 17:08:59,698 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loop-simple/nested_4.c [2021-01-06 17:08:59,707 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/20971aee0/d982a9a613254694ac7433f11b16063e/FLAGac411a3c1 [2021-01-06 17:09:00,076 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/20971aee0/d982a9a613254694ac7433f11b16063e [2021-01-06 17:09:00,081 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-01-06 17:09:00,086 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-01-06 17:09:00,092 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-01-06 17:09:00,092 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-01-06 17:09:00,097 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-01-06 17:09:00,098 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 05:09:00" (1/1) ... [2021-01-06 17:09:00,100 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3a74417f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:09:00, skipping insertion in model container [2021-01-06 17:09:00,101 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 05:09:00" (1/1) ... [2021-01-06 17:09:00,112 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-01-06 17:09:00,129 INFO L178 MainTranslator]: Built tables and reachable declarations left hand side expression in assignment: lhs: VariableLHS[~a~0,] left hand side expression in assignment: lhs: VariableLHS[~b~0,] left hand side expression in assignment: lhs: VariableLHS[~c~0,] left hand side expression in assignment: lhs: VariableLHS[~d~0,] [2021-01-06 17:09:00,388 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loop-simple/nested_4.c[841,854] [2021-01-06 17:09:00,394 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 17:09:00,407 INFO L203 MainTranslator]: Completed pre-run left hand side expression in assignment: lhs: VariableLHS[~a~0,] left hand side expression in assignment: lhs: VariableLHS[~b~0,] left hand side expression in assignment: lhs: VariableLHS[~c~0,] left hand side expression in assignment: lhs: VariableLHS[~d~0,] [2021-01-06 17:09:00,435 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loop-simple/nested_4.c[841,854] [2021-01-06 17:09:00,437 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 17:09:00,456 INFO L208 MainTranslator]: Completed translation [2021-01-06 17:09:00,457 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:09:00 WrapperNode [2021-01-06 17:09:00,457 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-01-06 17:09:00,461 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-01-06 17:09:00,461 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-01-06 17:09:00,461 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-01-06 17:09:00,470 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:09:00" (1/1) ... [2021-01-06 17:09:00,484 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:09:00" (1/1) ... [2021-01-06 17:09:00,510 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-01-06 17:09:00,513 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-01-06 17:09:00,514 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-01-06 17:09:00,514 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-01-06 17:09:00,524 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:09:00" (1/1) ... [2021-01-06 17:09:00,525 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:09:00" (1/1) ... [2021-01-06 17:09:00,540 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:09:00" (1/1) ... [2021-01-06 17:09:00,540 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:09:00" (1/1) ... [2021-01-06 17:09:00,545 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:09:00" (1/1) ... [2021-01-06 17:09:00,555 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:09:00" (1/1) ... [2021-01-06 17:09:00,561 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:09:00" (1/1) ... [2021-01-06 17:09:00,566 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-01-06 17:09:00,568 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-01-06 17:09:00,568 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-01-06 17:09:00,568 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-01-06 17:09:00,571 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:09:00" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 17:09:00,663 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-01-06 17:09:00,663 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-01-06 17:09:00,663 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-01-06 17:09:00,663 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-01-06 17:09:00,968 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-01-06 17:09:00,969 INFO L299 CfgBuilder]: Removed 8 assume(true) statements. [2021-01-06 17:09:00,974 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 05:09:00 BoogieIcfgContainer [2021-01-06 17:09:00,974 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-01-06 17:09:00,976 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-01-06 17:09:00,976 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-01-06 17:09:00,980 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-01-06 17:09:00,981 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.01 05:09:00" (1/3) ... [2021-01-06 17:09:00,982 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b32b14f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 05:09:00, skipping insertion in model container [2021-01-06 17:09:00,982 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 05:09:00" (2/3) ... [2021-01-06 17:09:00,982 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b32b14f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 05:09:00, skipping insertion in model container [2021-01-06 17:09:00,982 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 05:09:00" (3/3) ... [2021-01-06 17:09:00,985 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_4.c [2021-01-06 17:09:00,993 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-01-06 17:09:01,035 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-01-06 17:09:01,081 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-01-06 17:09:01,131 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-01-06 17:09:01,132 INFO L378 AbstractCegarLoop]: Hoare is true [2021-01-06 17:09:01,132 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-01-06 17:09:01,132 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-01-06 17:09:01,132 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-01-06 17:09:01,133 INFO L382 AbstractCegarLoop]: Difference is false [2021-01-06 17:09:01,133 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-01-06 17:09:01,133 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-01-06 17:09:01,156 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2021-01-06 17:09:01,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-01-06 17:09:01,163 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:09:01,164 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-01-06 17:09:01,164 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:09:01,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:09:01,173 INFO L82 PathProgramCache]: Analyzing trace with hash 28738512, now seen corresponding path program 1 times [2021-01-06 17:09:01,185 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:09:01,187 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1006517590] [2021-01-06 17:09:01,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:09:01,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:01,418 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:09:01,419 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1006517590] [2021-01-06 17:09:01,421 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 17:09:01,421 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-01-06 17:09:01,422 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842793550] [2021-01-06 17:09:01,428 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2021-01-06 17:09:01,428 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:09:01,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-01-06 17:09:01,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-01-06 17:09:01,457 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 2 states. [2021-01-06 17:09:01,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:09:01,480 INFO L93 Difference]: Finished difference Result 32 states and 48 transitions. [2021-01-06 17:09:01,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-01-06 17:09:01,482 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 5 [2021-01-06 17:09:01,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:09:01,497 INFO L225 Difference]: With dead ends: 32 [2021-01-06 17:09:01,497 INFO L226 Difference]: Without dead ends: 13 [2021-01-06 17:09:01,502 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-01-06 17:09:01,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-01-06 17:09:01,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-01-06 17:09:01,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2021-01-06 17:09:01,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2021-01-06 17:09:01,546 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 5 [2021-01-06 17:09:01,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:09:01,547 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2021-01-06 17:09:01,547 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2021-01-06 17:09:01,547 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2021-01-06 17:09:01,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-01-06 17:09:01,548 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:09:01,548 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-01-06 17:09:01,550 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-01-06 17:09:01,550 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:09:01,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:09:01,553 INFO L82 PathProgramCache]: Analyzing trace with hash 28698150, now seen corresponding path program 1 times [2021-01-06 17:09:01,554 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:09:01,555 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1772683373] [2021-01-06 17:09:01,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:09:01,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:01,663 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:09:01,663 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1772683373] [2021-01-06 17:09:01,663 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 17:09:01,664 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-01-06 17:09:01,664 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129646687] [2021-01-06 17:09:01,665 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-01-06 17:09:01,666 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:09:01,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-01-06 17:09:01,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 17:09:01,667 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand 3 states. [2021-01-06 17:09:01,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:09:01,692 INFO L93 Difference]: Finished difference Result 24 states and 30 transitions. [2021-01-06 17:09:01,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-01-06 17:09:01,693 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 5 [2021-01-06 17:09:01,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:09:01,694 INFO L225 Difference]: With dead ends: 24 [2021-01-06 17:09:01,694 INFO L226 Difference]: Without dead ends: 21 [2021-01-06 17:09:01,695 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 17:09:01,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-01-06 17:09:01,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 14. [2021-01-06 17:09:01,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2021-01-06 17:09:01,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2021-01-06 17:09:01,701 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 5 [2021-01-06 17:09:01,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:09:01,701 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2021-01-06 17:09:01,701 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-01-06 17:09:01,702 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2021-01-06 17:09:01,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-01-06 17:09:01,702 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:09:01,702 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 17:09:01,703 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-01-06 17:09:01,703 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:09:01,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:09:01,704 INFO L82 PathProgramCache]: Analyzing trace with hash 270060130, now seen corresponding path program 1 times [2021-01-06 17:09:01,704 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:09:01,704 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [260282274] [2021-01-06 17:09:01,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:09:01,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:01,748 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:09:01,748 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [260282274] [2021-01-06 17:09:01,748 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 17:09:01,749 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-01-06 17:09:01,749 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649093533] [2021-01-06 17:09:01,749 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-01-06 17:09:01,750 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:09:01,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-01-06 17:09:01,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 17:09:01,751 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand 3 states. [2021-01-06 17:09:01,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:09:01,777 INFO L93 Difference]: Finished difference Result 31 states and 40 transitions. [2021-01-06 17:09:01,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-01-06 17:09:01,778 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 8 [2021-01-06 17:09:01,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:09:01,779 INFO L225 Difference]: With dead ends: 31 [2021-01-06 17:09:01,779 INFO L226 Difference]: Without dead ends: 20 [2021-01-06 17:09:01,780 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 17:09:01,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-01-06 17:09:01,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 15. [2021-01-06 17:09:01,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2021-01-06 17:09:01,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2021-01-06 17:09:01,785 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 8 [2021-01-06 17:09:01,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:09:01,786 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2021-01-06 17:09:01,786 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-01-06 17:09:01,786 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2021-01-06 17:09:01,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-01-06 17:09:01,787 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:09:01,787 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 17:09:01,787 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-01-06 17:09:01,788 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:09:01,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:09:01,788 INFO L82 PathProgramCache]: Analyzing trace with hash 1248345450, now seen corresponding path program 1 times [2021-01-06 17:09:01,789 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:09:01,789 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730746742] [2021-01-06 17:09:01,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:09:01,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:01,832 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:09:01,832 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730746742] [2021-01-06 17:09:01,833 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 17:09:01,833 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-01-06 17:09:01,833 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961215378] [2021-01-06 17:09:01,834 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-01-06 17:09:01,834 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:09:01,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-01-06 17:09:01,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 17:09:01,835 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand 3 states. [2021-01-06 17:09:01,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:09:01,863 INFO L93 Difference]: Finished difference Result 31 states and 39 transitions. [2021-01-06 17:09:01,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-01-06 17:09:01,864 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2021-01-06 17:09:01,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:09:01,865 INFO L225 Difference]: With dead ends: 31 [2021-01-06 17:09:01,865 INFO L226 Difference]: Without dead ends: 19 [2021-01-06 17:09:01,866 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 17:09:01,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-01-06 17:09:01,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 16. [2021-01-06 17:09:01,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2021-01-06 17:09:01,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2021-01-06 17:09:01,874 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 11 [2021-01-06 17:09:01,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:09:01,875 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2021-01-06 17:09:01,876 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-01-06 17:09:01,876 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2021-01-06 17:09:01,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-01-06 17:09:01,877 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:09:01,877 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 17:09:01,877 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-01-06 17:09:01,877 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:09:01,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:09:01,881 INFO L82 PathProgramCache]: Analyzing trace with hash -793045314, now seen corresponding path program 1 times [2021-01-06 17:09:01,881 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:09:01,881 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1574458487] [2021-01-06 17:09:01,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:09:01,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:01,959 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:09:01,959 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1574458487] [2021-01-06 17:09:01,960 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 17:09:01,960 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-01-06 17:09:01,960 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191209663] [2021-01-06 17:09:01,961 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-01-06 17:09:01,961 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:09:01,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-01-06 17:09:01,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 17:09:01,962 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand 3 states. [2021-01-06 17:09:01,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:09:01,984 INFO L93 Difference]: Finished difference Result 31 states and 38 transitions. [2021-01-06 17:09:01,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-01-06 17:09:01,985 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2021-01-06 17:09:01,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:09:01,986 INFO L225 Difference]: With dead ends: 31 [2021-01-06 17:09:01,986 INFO L226 Difference]: Without dead ends: 18 [2021-01-06 17:09:01,987 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 17:09:01,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-01-06 17:09:01,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2021-01-06 17:09:01,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2021-01-06 17:09:01,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2021-01-06 17:09:01,992 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 14 [2021-01-06 17:09:01,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:09:01,992 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2021-01-06 17:09:01,992 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-01-06 17:09:01,992 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2021-01-06 17:09:01,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-01-06 17:09:01,993 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:09:01,993 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 17:09:01,994 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-01-06 17:09:01,994 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:09:01,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:09:01,995 INFO L82 PathProgramCache]: Analyzing trace with hash -1973513092, now seen corresponding path program 1 times [2021-01-06 17:09:01,995 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:09:01,995 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8348815] [2021-01-06 17:09:01,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:09:02,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:02,034 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:09:02,034 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [8348815] [2021-01-06 17:09:02,035 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1511895868] [2021-01-06 17:09:02,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:02,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:02,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2021-01-06 17:09:02,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:09:02,157 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:09:02,158 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:09:02,158 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-01-06 17:09:02,159 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312971872] [2021-01-06 17:09:02,159 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-01-06 17:09:02,159 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:09:02,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-01-06 17:09:02,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-01-06 17:09:02,161 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand 5 states. [2021-01-06 17:09:02,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:09:02,217 INFO L93 Difference]: Finished difference Result 34 states and 41 transitions. [2021-01-06 17:09:02,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-01-06 17:09:02,218 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2021-01-06 17:09:02,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:09:02,219 INFO L225 Difference]: With dead ends: 34 [2021-01-06 17:09:02,219 INFO L226 Difference]: Without dead ends: 20 [2021-01-06 17:09:02,220 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-01-06 17:09:02,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-01-06 17:09:02,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2021-01-06 17:09:02,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2021-01-06 17:09:02,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2021-01-06 17:09:02,228 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 16 [2021-01-06 17:09:02,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:09:02,230 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2021-01-06 17:09:02,230 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-01-06 17:09:02,231 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2021-01-06 17:09:02,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-01-06 17:09:02,231 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:09:02,233 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 17:09:02,434 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-01-06 17:09:02,435 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:09:02,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:09:02,437 INFO L82 PathProgramCache]: Analyzing trace with hash 1763285690, now seen corresponding path program 2 times [2021-01-06 17:09:02,438 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:09:02,438 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1593685265] [2021-01-06 17:09:02,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:09:02,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:02,522 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-01-06 17:09:02,523 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1593685265] [2021-01-06 17:09:02,523 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [222114006] [2021-01-06 17:09:02,523 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:02,580 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 17:09:02,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:09:02,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 4 conjunts are in the unsatisfiable core [2021-01-06 17:09:02,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:09:02,633 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 17:09:02,633 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:09:02,633 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 7 [2021-01-06 17:09:02,634 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328856303] [2021-01-06 17:09:02,634 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-01-06 17:09:02,635 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:09:02,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-01-06 17:09:02,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-01-06 17:09:02,636 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 7 states. [2021-01-06 17:09:02,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:09:02,760 INFO L93 Difference]: Finished difference Result 57 states and 69 transitions. [2021-01-06 17:09:02,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-01-06 17:09:02,761 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2021-01-06 17:09:02,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:09:02,762 INFO L225 Difference]: With dead ends: 57 [2021-01-06 17:09:02,762 INFO L226 Difference]: Without dead ends: 41 [2021-01-06 17:09:02,787 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2021-01-06 17:09:02,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-01-06 17:09:02,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 30. [2021-01-06 17:09:02,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2021-01-06 17:09:02,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2021-01-06 17:09:02,797 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 18 [2021-01-06 17:09:02,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:09:02,797 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2021-01-06 17:09:02,798 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2021-01-06 17:09:02,798 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2021-01-06 17:09:02,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-01-06 17:09:02,799 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:09:02,799 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 17:09:03,012 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:03,013 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:09:03,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:09:03,014 INFO L82 PathProgramCache]: Analyzing trace with hash -1745752790, now seen corresponding path program 3 times [2021-01-06 17:09:03,015 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:09:03,015 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1874243480] [2021-01-06 17:09:03,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:09:03,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:03,103 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-01-06 17:09:03,103 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1874243480] [2021-01-06 17:09:03,103 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [724900697] [2021-01-06 17:09:03,104 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:03,143 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-01-06 17:09:03,143 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:09:03,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 3 conjunts are in the unsatisfiable core [2021-01-06 17:09:03,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:09:03,218 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-01-06 17:09:03,219 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:09:03,219 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2021-01-06 17:09:03,221 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354014665] [2021-01-06 17:09:03,222 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-01-06 17:09:03,222 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:09:03,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-01-06 17:09:03,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-01-06 17:09:03,224 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 6 states. [2021-01-06 17:09:03,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:09:03,372 INFO L93 Difference]: Finished difference Result 227 states and 265 transitions. [2021-01-06 17:09:03,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-01-06 17:09:03,376 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 29 [2021-01-06 17:09:03,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:09:03,378 INFO L225 Difference]: With dead ends: 227 [2021-01-06 17:09:03,379 INFO L226 Difference]: Without dead ends: 200 [2021-01-06 17:09:03,383 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-01-06 17:09:03,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-01-06 17:09:03,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 96. [2021-01-06 17:09:03,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2021-01-06 17:09:03,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 110 transitions. [2021-01-06 17:09:03,421 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 110 transitions. Word has length 29 [2021-01-06 17:09:03,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:09:03,422 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 110 transitions. [2021-01-06 17:09:03,422 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-01-06 17:09:03,422 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 110 transitions. [2021-01-06 17:09:03,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-01-06 17:09:03,425 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:09:03,425 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2021-01-06 17:09:03,638 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:03,639 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:09:03,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:09:03,641 INFO L82 PathProgramCache]: Analyzing trace with hash 305051558, now seen corresponding path program 4 times [2021-01-06 17:09:03,641 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:09:03,641 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513880338] [2021-01-06 17:09:03,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:09:03,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:03,739 INFO L134 CoverageAnalysis]: Checked inductivity of 891 backedges. 193 proven. 9 refuted. 0 times theorem prover too weak. 689 trivial. 0 not checked. [2021-01-06 17:09:03,740 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513880338] [2021-01-06 17:09:03,740 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1507875779] [2021-01-06 17:09:03,740 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:03,806 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 17:09:03,806 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:09:03,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 5 conjunts are in the unsatisfiable core [2021-01-06 17:09:03,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:09:03,928 INFO L134 CoverageAnalysis]: Checked inductivity of 891 backedges. 193 proven. 9 refuted. 0 times theorem prover too weak. 689 trivial. 0 not checked. [2021-01-06 17:09:03,929 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:09:03,929 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2021-01-06 17:09:03,929 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346989866] [2021-01-06 17:09:03,930 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-01-06 17:09:03,930 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:09:03,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-01-06 17:09:03,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-01-06 17:09:03,932 INFO L87 Difference]: Start difference. First operand 96 states and 110 transitions. Second operand 7 states. [2021-01-06 17:09:03,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:09:03,971 INFO L93 Difference]: Finished difference Result 204 states and 239 transitions. [2021-01-06 17:09:03,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-01-06 17:09:03,971 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 95 [2021-01-06 17:09:03,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:09:03,973 INFO L225 Difference]: With dead ends: 204 [2021-01-06 17:09:03,973 INFO L226 Difference]: Without dead ends: 120 [2021-01-06 17:09:03,974 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-01-06 17:09:03,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-01-06 17:09:03,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 112. [2021-01-06 17:09:03,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2021-01-06 17:09:03,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 126 transitions. [2021-01-06 17:09:03,991 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 126 transitions. Word has length 95 [2021-01-06 17:09:03,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:09:03,991 INFO L481 AbstractCegarLoop]: Abstraction has 112 states and 126 transitions. [2021-01-06 17:09:03,991 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2021-01-06 17:09:03,992 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 126 transitions. [2021-01-06 17:09:03,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-01-06 17:09:03,994 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:09:03,994 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2021-01-06 17:09:04,208 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:04,209 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:09:04,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:09:04,211 INFO L82 PathProgramCache]: Analyzing trace with hash -986598490, now seen corresponding path program 5 times [2021-01-06 17:09:04,212 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:09:04,212 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556379570] [2021-01-06 17:09:04,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:09:04,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:04,314 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 305 proven. 16 refuted. 0 times theorem prover too weak. 1074 trivial. 0 not checked. [2021-01-06 17:09:04,315 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556379570] [2021-01-06 17:09:04,315 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [540501551] [2021-01-06 17:09:04,315 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:04,362 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-01-06 17:09:04,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:09:04,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 6 conjunts are in the unsatisfiable core [2021-01-06 17:09:04,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:09:04,516 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 754 proven. 16 refuted. 0 times theorem prover too weak. 625 trivial. 0 not checked. [2021-01-06 17:09:04,517 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:09:04,517 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2021-01-06 17:09:04,517 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249464568] [2021-01-06 17:09:04,518 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-01-06 17:09:04,518 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:09:04,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-01-06 17:09:04,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-01-06 17:09:04,519 INFO L87 Difference]: Start difference. First operand 112 states and 126 transitions. Second operand 8 states. [2021-01-06 17:09:04,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:09:04,556 INFO L93 Difference]: Finished difference Result 234 states and 269 transitions. [2021-01-06 17:09:04,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-01-06 17:09:04,556 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 111 [2021-01-06 17:09:04,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:09:04,558 INFO L225 Difference]: With dead ends: 234 [2021-01-06 17:09:04,558 INFO L226 Difference]: Without dead ends: 136 [2021-01-06 17:09:04,564 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-01-06 17:09:04,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-01-06 17:09:04,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 128. [2021-01-06 17:09:04,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2021-01-06 17:09:04,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 142 transitions. [2021-01-06 17:09:04,603 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 142 transitions. Word has length 111 [2021-01-06 17:09:04,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:09:04,605 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 142 transitions. [2021-01-06 17:09:04,606 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-01-06 17:09:04,606 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 142 transitions. [2021-01-06 17:09:04,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-01-06 17:09:04,613 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:09:04,613 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2021-01-06 17:09:04,814 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-01-06 17:09:04,815 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:09:04,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:09:04,816 INFO L82 PathProgramCache]: Analyzing trace with hash -859525210, now seen corresponding path program 6 times [2021-01-06 17:09:04,816 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:09:04,817 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1702665877] [2021-01-06 17:09:04,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:09:04,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:05,013 INFO L134 CoverageAnalysis]: Checked inductivity of 2027 backedges. 445 proven. 25 refuted. 0 times theorem prover too weak. 1557 trivial. 0 not checked. [2021-01-06 17:09:05,014 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1702665877] [2021-01-06 17:09:05,014 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [208360129] [2021-01-06 17:09:05,014 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:05,108 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 24 check-sat command(s) [2021-01-06 17:09:05,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:09:05,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 7 conjunts are in the unsatisfiable core [2021-01-06 17:09:05,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:09:05,241 INFO L134 CoverageAnalysis]: Checked inductivity of 2027 backedges. 1094 proven. 25 refuted. 0 times theorem prover too weak. 908 trivial. 0 not checked. [2021-01-06 17:09:05,241 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:09:05,241 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-01-06 17:09:05,242 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304507834] [2021-01-06 17:09:05,242 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-01-06 17:09:05,243 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:09:05,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-01-06 17:09:05,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-01-06 17:09:05,244 INFO L87 Difference]: Start difference. First operand 128 states and 142 transitions. Second operand 9 states. [2021-01-06 17:09:05,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:09:05,284 INFO L93 Difference]: Finished difference Result 256 states and 291 transitions. [2021-01-06 17:09:05,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-01-06 17:09:05,285 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 127 [2021-01-06 17:09:05,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:09:05,286 INFO L225 Difference]: With dead ends: 256 [2021-01-06 17:09:05,286 INFO L226 Difference]: Without dead ends: 144 [2021-01-06 17:09:05,287 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-01-06 17:09:05,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-01-06 17:09:05,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 144. [2021-01-06 17:09:05,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2021-01-06 17:09:05,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 158 transitions. [2021-01-06 17:09:05,300 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 158 transitions. Word has length 127 [2021-01-06 17:09:05,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:09:05,300 INFO L481 AbstractCegarLoop]: Abstraction has 144 states and 158 transitions. [2021-01-06 17:09:05,300 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-01-06 17:09:05,300 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 158 transitions. [2021-01-06 17:09:05,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-01-06 17:09:05,302 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:09:05,303 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2021-01-06 17:09:05,516 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:05,517 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:09:05,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:09:05,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1331145638, now seen corresponding path program 7 times [2021-01-06 17:09:05,519 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:09:05,519 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [755391608] [2021-01-06 17:09:05,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:09:05,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:05,623 INFO L134 CoverageAnalysis]: Checked inductivity of 2787 backedges. 1066 proven. 89 refuted. 0 times theorem prover too weak. 1632 trivial. 0 not checked. [2021-01-06 17:09:05,624 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [755391608] [2021-01-06 17:09:05,624 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1647331178] [2021-01-06 17:09:05,624 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:05,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:05,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 4 conjunts are in the unsatisfiable core [2021-01-06 17:09:05,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:09:05,844 INFO L134 CoverageAnalysis]: Checked inductivity of 2787 backedges. 1066 proven. 89 refuted. 0 times theorem prover too weak. 1632 trivial. 0 not checked. [2021-01-06 17:09:05,845 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:09:05,845 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-01-06 17:09:05,846 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127404079] [2021-01-06 17:09:05,847 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-01-06 17:09:05,847 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:09:05,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-01-06 17:09:05,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-01-06 17:09:05,848 INFO L87 Difference]: Start difference. First operand 144 states and 158 transitions. Second operand 6 states. [2021-01-06 17:09:05,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:09:05,893 INFO L93 Difference]: Finished difference Result 369 states and 406 transitions. [2021-01-06 17:09:05,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-01-06 17:09:05,893 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 143 [2021-01-06 17:09:05,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:09:05,895 INFO L225 Difference]: With dead ends: 369 [2021-01-06 17:09:05,895 INFO L226 Difference]: Without dead ends: 260 [2021-01-06 17:09:05,896 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-01-06 17:09:05,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-01-06 17:09:05,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 204. [2021-01-06 17:09:05,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2021-01-06 17:09:05,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 222 transitions. [2021-01-06 17:09:05,915 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 222 transitions. Word has length 143 [2021-01-06 17:09:05,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:09:05,916 INFO L481 AbstractCegarLoop]: Abstraction has 204 states and 222 transitions. [2021-01-06 17:09:05,916 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-01-06 17:09:05,916 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 222 transitions. [2021-01-06 17:09:05,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2021-01-06 17:09:05,922 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:09:05,922 INFO L422 BasicCegarLoop]: trace histogram [72, 72, 12, 12, 12, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2021-01-06 17:09:06,127 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:06,128 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:09:06,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:09:06,129 INFO L82 PathProgramCache]: Analyzing trace with hash -1485965146, now seen corresponding path program 8 times [2021-01-06 17:09:06,130 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:09:06,130 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2134860170] [2021-01-06 17:09:06,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:09:06,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:06,282 INFO L134 CoverageAnalysis]: Checked inductivity of 6253 backedges. 2377 proven. 264 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2021-01-06 17:09:06,283 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2134860170] [2021-01-06 17:09:06,283 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1861721102] [2021-01-06 17:09:06,283 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:06,405 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 17:09:06,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:09:06,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 5 conjunts are in the unsatisfiable core [2021-01-06 17:09:06,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:09:06,662 INFO L134 CoverageAnalysis]: Checked inductivity of 6253 backedges. 2377 proven. 264 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2021-01-06 17:09:06,663 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:09:06,663 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2021-01-06 17:09:06,663 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568300422] [2021-01-06 17:09:06,664 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-01-06 17:09:06,664 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:09:06,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-01-06 17:09:06,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-01-06 17:09:06,665 INFO L87 Difference]: Start difference. First operand 204 states and 222 transitions. Second operand 7 states. [2021-01-06 17:09:06,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:09:06,711 INFO L93 Difference]: Finished difference Result 474 states and 518 transitions. [2021-01-06 17:09:06,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-01-06 17:09:06,712 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 203 [2021-01-06 17:09:06,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:09:06,714 INFO L225 Difference]: With dead ends: 474 [2021-01-06 17:09:06,714 INFO L226 Difference]: Without dead ends: 320 [2021-01-06 17:09:06,715 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 203 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-01-06 17:09:06,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2021-01-06 17:09:06,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 264. [2021-01-06 17:09:06,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 264 states. [2021-01-06 17:09:06,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 286 transitions. [2021-01-06 17:09:06,734 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 286 transitions. Word has length 203 [2021-01-06 17:09:06,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:09:06,735 INFO L481 AbstractCegarLoop]: Abstraction has 264 states and 286 transitions. [2021-01-06 17:09:06,735 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2021-01-06 17:09:06,735 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 286 transitions. [2021-01-06 17:09:06,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2021-01-06 17:09:06,739 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:09:06,740 INFO L422 BasicCegarLoop]: trace histogram [96, 96, 16, 16, 16, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2021-01-06 17:09:06,952 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-01-06 17:09:06,953 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:09:06,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:09:06,954 INFO L82 PathProgramCache]: Analyzing trace with hash 889851302, now seen corresponding path program 9 times [2021-01-06 17:09:06,955 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:09:06,956 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1792762745] [2021-01-06 17:09:06,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:09:07,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:07,160 INFO L134 CoverageAnalysis]: Checked inductivity of 11111 backedges. 4210 proven. 526 refuted. 0 times theorem prover too weak. 6375 trivial. 0 not checked. [2021-01-06 17:09:07,160 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1792762745] [2021-01-06 17:09:07,161 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [27190038] [2021-01-06 17:09:07,161 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:07,292 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2021-01-06 17:09:07,292 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:09:07,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 6 conjunts are in the unsatisfiable core [2021-01-06 17:09:07,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:09:07,624 INFO L134 CoverageAnalysis]: Checked inductivity of 11111 backedges. 4214 proven. 526 refuted. 0 times theorem prover too weak. 6371 trivial. 0 not checked. [2021-01-06 17:09:07,625 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:09:07,625 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2021-01-06 17:09:07,625 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987424767] [2021-01-06 17:09:07,626 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-01-06 17:09:07,626 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:09:07,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-01-06 17:09:07,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-01-06 17:09:07,627 INFO L87 Difference]: Start difference. First operand 264 states and 286 transitions. Second operand 8 states. [2021-01-06 17:09:07,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:09:07,694 INFO L93 Difference]: Finished difference Result 579 states and 630 transitions. [2021-01-06 17:09:07,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-01-06 17:09:07,694 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 263 [2021-01-06 17:09:07,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:09:07,697 INFO L225 Difference]: With dead ends: 579 [2021-01-06 17:09:07,697 INFO L226 Difference]: Without dead ends: 380 [2021-01-06 17:09:07,699 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 263 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-01-06 17:09:07,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2021-01-06 17:09:07,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 324. [2021-01-06 17:09:07,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 324 states. [2021-01-06 17:09:07,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 350 transitions. [2021-01-06 17:09:07,731 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 350 transitions. Word has length 263 [2021-01-06 17:09:07,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:09:07,732 INFO L481 AbstractCegarLoop]: Abstraction has 324 states and 350 transitions. [2021-01-06 17:09:07,732 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-01-06 17:09:07,732 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 350 transitions. [2021-01-06 17:09:07,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 324 [2021-01-06 17:09:07,739 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:09:07,739 INFO L422 BasicCegarLoop]: trace histogram [120, 120, 20, 20, 20, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2021-01-06 17:09:07,952 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:07,952 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:09:07,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:09:07,953 INFO L82 PathProgramCache]: Analyzing trace with hash -955282778, now seen corresponding path program 10 times [2021-01-06 17:09:07,953 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:09:07,954 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1327860756] [2021-01-06 17:09:07,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:09:08,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:08,248 INFO L134 CoverageAnalysis]: Checked inductivity of 17361 backedges. 6565 proven. 875 refuted. 0 times theorem prover too weak. 9921 trivial. 0 not checked. [2021-01-06 17:09:08,249 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1327860756] [2021-01-06 17:09:08,249 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [690743509] [2021-01-06 17:09:08,249 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:08,428 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 17:09:08,429 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:09:08,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 7 conjunts are in the unsatisfiable core [2021-01-06 17:09:08,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:09:08,781 INFO L134 CoverageAnalysis]: Checked inductivity of 17361 backedges. 6565 proven. 875 refuted. 0 times theorem prover too weak. 9921 trivial. 0 not checked. [2021-01-06 17:09:08,782 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:09:08,782 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-01-06 17:09:08,782 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567162612] [2021-01-06 17:09:08,783 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-01-06 17:09:08,783 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:09:08,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-01-06 17:09:08,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-01-06 17:09:08,784 INFO L87 Difference]: Start difference. First operand 324 states and 350 transitions. Second operand 9 states. [2021-01-06 17:09:08,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:09:08,845 INFO L93 Difference]: Finished difference Result 628 states and 682 transitions. [2021-01-06 17:09:08,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-01-06 17:09:08,846 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 323 [2021-01-06 17:09:08,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:09:08,850 INFO L225 Difference]: With dead ends: 628 [2021-01-06 17:09:08,851 INFO L226 Difference]: Without dead ends: 384 [2021-01-06 17:09:08,853 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 323 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-01-06 17:09:08,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 384 states. [2021-01-06 17:09:08,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 384 to 384. [2021-01-06 17:09:08,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 384 states. [2021-01-06 17:09:08,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 384 states to 384 states and 414 transitions. [2021-01-06 17:09:08,883 INFO L78 Accepts]: Start accepts. Automaton has 384 states and 414 transitions. Word has length 323 [2021-01-06 17:09:08,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:09:08,883 INFO L481 AbstractCegarLoop]: Abstraction has 384 states and 414 transitions. [2021-01-06 17:09:08,883 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-01-06 17:09:08,884 INFO L276 IsEmpty]: Start isEmpty. Operand 384 states and 414 transitions. [2021-01-06 17:09:08,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 384 [2021-01-06 17:09:08,890 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:09:08,890 INFO L422 BasicCegarLoop]: trace histogram [144, 144, 24, 24, 24, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2021-01-06 17:09:09,103 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-01-06 17:09:09,104 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:09:09,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:09:09,105 INFO L82 PathProgramCache]: Analyzing trace with hash -1217433690, now seen corresponding path program 11 times [2021-01-06 17:09:09,105 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:09:09,106 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1512610019] [2021-01-06 17:09:09,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:09:09,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:09,455 INFO L134 CoverageAnalysis]: Checked inductivity of 25003 backedges. 12595 proven. 3149 refuted. 0 times theorem prover too weak. 9259 trivial. 0 not checked. [2021-01-06 17:09:09,455 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1512610019] [2021-01-06 17:09:09,455 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [276948045] [2021-01-06 17:09:09,456 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:09,827 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 130 check-sat command(s) [2021-01-06 17:09:09,828 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:09:09,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 614 conjuncts, 4 conjunts are in the unsatisfiable core [2021-01-06 17:09:09,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:09:10,272 INFO L134 CoverageAnalysis]: Checked inductivity of 25003 backedges. 12595 proven. 3149 refuted. 0 times theorem prover too weak. 9259 trivial. 0 not checked. [2021-01-06 17:09:10,272 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:09:10,273 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-01-06 17:09:10,273 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835585691] [2021-01-06 17:09:10,274 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-01-06 17:09:10,274 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:09:10,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-01-06 17:09:10,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-01-06 17:09:10,275 INFO L87 Difference]: Start difference. First operand 384 states and 414 transitions. Second operand 6 states. [2021-01-06 17:09:10,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:09:10,345 INFO L93 Difference]: Finished difference Result 948 states and 1023 transitions. [2021-01-06 17:09:10,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-01-06 17:09:10,345 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 383 [2021-01-06 17:09:10,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:09:10,350 INFO L225 Difference]: With dead ends: 948 [2021-01-06 17:09:10,350 INFO L226 Difference]: Without dead ends: 754 [2021-01-06 17:09:10,351 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 387 GetRequests, 383 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-01-06 17:09:10,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 754 states. [2021-01-06 17:09:10,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 754 to 570. [2021-01-06 17:09:10,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 570 states. [2021-01-06 17:09:10,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 570 states to 570 states and 614 transitions. [2021-01-06 17:09:10,396 INFO L78 Accepts]: Start accepts. Automaton has 570 states and 614 transitions. Word has length 383 [2021-01-06 17:09:10,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:09:10,397 INFO L481 AbstractCegarLoop]: Abstraction has 570 states and 614 transitions. [2021-01-06 17:09:10,397 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-01-06 17:09:10,397 INFO L276 IsEmpty]: Start isEmpty. Operand 570 states and 614 transitions. [2021-01-06 17:09:10,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 570 [2021-01-06 17:09:10,411 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:09:10,412 INFO L422 BasicCegarLoop]: trace histogram [216, 216, 36, 36, 36, 6, 6, 6, 2, 2, 2, 1, 1, 1, 1, 1] [2021-01-06 17:09:10,627 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-01-06 17:09:10,628 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:09:10,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:09:10,629 INFO L82 PathProgramCache]: Analyzing trace with hash 267351982, now seen corresponding path program 12 times [2021-01-06 17:09:10,629 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:09:10,629 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1398778247] [2021-01-06 17:09:10,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:09:10,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:11,131 INFO L134 CoverageAnalysis]: Checked inductivity of 56384 backedges. 28332 proven. 9444 refuted. 0 times theorem prover too weak. 18608 trivial. 0 not checked. [2021-01-06 17:09:11,131 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1398778247] [2021-01-06 17:09:11,132 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [418536063] [2021-01-06 17:09:11,132 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:11,744 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 134 check-sat command(s) [2021-01-06 17:09:11,745 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:09:11,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 819 conjuncts, 4 conjunts are in the unsatisfiable core [2021-01-06 17:09:11,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:09:12,565 INFO L134 CoverageAnalysis]: Checked inductivity of 56384 backedges. 0 proven. 28334 refuted. 0 times theorem prover too weak. 28050 trivial. 0 not checked. [2021-01-06 17:09:12,565 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:09:12,566 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2021-01-06 17:09:12,566 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192609053] [2021-01-06 17:09:12,567 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-01-06 17:09:12,567 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:09:12,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-01-06 17:09:12,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-01-06 17:09:12,568 INFO L87 Difference]: Start difference. First operand 570 states and 614 transitions. Second operand 9 states. [2021-01-06 17:09:12,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:09:12,878 INFO L93 Difference]: Finished difference Result 2160 states and 2331 transitions. [2021-01-06 17:09:12,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-01-06 17:09:12,878 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 569 [2021-01-06 17:09:12,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:09:12,888 INFO L225 Difference]: With dead ends: 2160 [2021-01-06 17:09:12,888 INFO L226 Difference]: Without dead ends: 1873 [2021-01-06 17:09:12,890 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 567 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=150, Invalid=270, Unknown=0, NotChecked=0, Total=420 [2021-01-06 17:09:12,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1873 states. [2021-01-06 17:09:12,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1873 to 1131. [2021-01-06 17:09:12,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1131 states. [2021-01-06 17:09:12,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1131 states to 1131 states and 1218 transitions. [2021-01-06 17:09:12,976 INFO L78 Accepts]: Start accepts. Automaton has 1131 states and 1218 transitions. Word has length 569 [2021-01-06 17:09:12,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:09:12,977 INFO L481 AbstractCegarLoop]: Abstraction has 1131 states and 1218 transitions. [2021-01-06 17:09:12,977 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-01-06 17:09:12,977 INFO L276 IsEmpty]: Start isEmpty. Operand 1131 states and 1218 transitions. [2021-01-06 17:09:12,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1131 [2021-01-06 17:09:12,990 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:09:12,990 INFO L422 BasicCegarLoop]: trace histogram [432, 432, 72, 72, 72, 12, 12, 12, 3, 3, 3, 1, 1, 1, 1, 1] [2021-01-06 17:09:13,204 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-01-06 17:09:13,205 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:09:13,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:09:13,206 INFO L82 PathProgramCache]: Analyzing trace with hash 550676450, now seen corresponding path program 13 times [2021-01-06 17:09:13,207 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:09:13,207 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1961444314] [2021-01-06 17:09:13,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:09:13,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:14,726 INFO L134 CoverageAnalysis]: Checked inductivity of 226074 backedges. 100725 proven. 18886 refuted. 0 times theorem prover too weak. 106463 trivial. 0 not checked. [2021-01-06 17:09:14,727 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1961444314] [2021-01-06 17:09:14,733 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909433794] [2021-01-06 17:09:14,733 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:15,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:15,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 1860 conjuncts, 6 conjunts are in the unsatisfiable core [2021-01-06 17:09:15,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:09:16,830 INFO L134 CoverageAnalysis]: Checked inductivity of 226074 backedges. 100725 proven. 18886 refuted. 0 times theorem prover too weak. 106463 trivial. 0 not checked. [2021-01-06 17:09:16,830 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:09:16,831 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2021-01-06 17:09:16,831 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099098650] [2021-01-06 17:09:16,835 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-01-06 17:09:16,835 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:09:16,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-01-06 17:09:16,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-01-06 17:09:16,836 INFO L87 Difference]: Start difference. First operand 1131 states and 1218 transitions. Second operand 8 states. [2021-01-06 17:09:17,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:09:17,040 INFO L93 Difference]: Finished difference Result 2441 states and 2631 transitions. [2021-01-06 17:09:17,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-01-06 17:09:17,040 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 1130 [2021-01-06 17:09:17,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:09:17,049 INFO L225 Difference]: With dead ends: 2441 [2021-01-06 17:09:17,049 INFO L226 Difference]: Without dead ends: 1686 [2021-01-06 17:09:17,054 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 1136 GetRequests, 1130 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-01-06 17:09:17,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1686 states. [2021-01-06 17:09:17,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1686 to 1410. [2021-01-06 17:09:17,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1410 states. [2021-01-06 17:09:17,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1410 states to 1410 states and 1518 transitions. [2021-01-06 17:09:17,167 INFO L78 Accepts]: Start accepts. Automaton has 1410 states and 1518 transitions. Word has length 1130 [2021-01-06 17:09:17,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:09:17,168 INFO L481 AbstractCegarLoop]: Abstraction has 1410 states and 1518 transitions. [2021-01-06 17:09:17,169 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-01-06 17:09:17,169 INFO L276 IsEmpty]: Start isEmpty. Operand 1410 states and 1518 transitions. [2021-01-06 17:09:17,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1410 [2021-01-06 17:09:17,187 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:09:17,187 INFO L422 BasicCegarLoop]: trace histogram [540, 540, 90, 90, 90, 15, 15, 15, 3, 3, 3, 1, 1, 1, 1, 1] [2021-01-06 17:09:17,402 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-01-06 17:09:17,403 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:09:17,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:09:17,404 INFO L82 PathProgramCache]: Analyzing trace with hash 1545912050, now seen corresponding path program 14 times [2021-01-06 17:09:17,405 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:09:17,405 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [125266001] [2021-01-06 17:09:17,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:09:17,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:19,515 INFO L134 CoverageAnalysis]: Checked inductivity of 353397 backedges. 157375 proven. 31475 refuted. 0 times theorem prover too weak. 164547 trivial. 0 not checked. [2021-01-06 17:09:19,515 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [125266001] [2021-01-06 17:09:19,515 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [836149198] [2021-01-06 17:09:19,516 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:20,052 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 17:09:20,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:09:20,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 2310 conjuncts, 7 conjunts are in the unsatisfiable core [2021-01-06 17:09:20,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:09:22,192 INFO L134 CoverageAnalysis]: Checked inductivity of 353397 backedges. 157375 proven. 31475 refuted. 0 times theorem prover too weak. 164547 trivial. 0 not checked. [2021-01-06 17:09:22,192 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:09:22,192 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-01-06 17:09:22,193 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69398186] [2021-01-06 17:09:22,194 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-01-06 17:09:22,194 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:09:22,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-01-06 17:09:22,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-01-06 17:09:22,195 INFO L87 Difference]: Start difference. First operand 1410 states and 1518 transitions. Second operand 9 states. [2021-01-06 17:09:22,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:09:22,325 INFO L93 Difference]: Finished difference Result 2630 states and 2834 transitions. [2021-01-06 17:09:22,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-01-06 17:09:22,326 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 1409 [2021-01-06 17:09:22,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:09:22,334 INFO L225 Difference]: With dead ends: 2630 [2021-01-06 17:09:22,334 INFO L226 Difference]: Without dead ends: 1689 [2021-01-06 17:09:22,336 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 1416 GetRequests, 1409 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-01-06 17:09:22,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1689 states. [2021-01-06 17:09:22,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1689 to 1689. [2021-01-06 17:09:22,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1689 states. [2021-01-06 17:09:22,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1689 states to 1689 states and 1818 transitions. [2021-01-06 17:09:22,460 INFO L78 Accepts]: Start accepts. Automaton has 1689 states and 1818 transitions. Word has length 1409 [2021-01-06 17:09:22,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:09:22,461 INFO L481 AbstractCegarLoop]: Abstraction has 1689 states and 1818 transitions. [2021-01-06 17:09:22,461 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-01-06 17:09:22,461 INFO L276 IsEmpty]: Start isEmpty. Operand 1689 states and 1818 transitions. [2021-01-06 17:09:22,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1689 [2021-01-06 17:09:22,484 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 17:09:22,485 INFO L422 BasicCegarLoop]: trace histogram [648, 648, 108, 108, 108, 18, 18, 18, 3, 3, 3, 1, 1, 1, 1, 1] [2021-01-06 17:09:22,698 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:22,699 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 17:09:22,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 17:09:22,700 INFO L82 PathProgramCache]: Analyzing trace with hash -477789726, now seen corresponding path program 15 times [2021-01-06 17:09:22,701 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 17:09:22,701 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [222940427] [2021-01-06 17:09:22,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 17:09:23,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 17:09:27,513 INFO L134 CoverageAnalysis]: Checked inductivity of 509043 backedges. 0 proven. 339924 refuted. 0 times theorem prover too weak. 169119 trivial. 0 not checked. [2021-01-06 17:09:27,513 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [222940427] [2021-01-06 17:09:27,513 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [648917164] [2021-01-06 17:09:27,513 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:28,417 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 189 check-sat command(s) [2021-01-06 17:09:28,417 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 17:09:28,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 1113 conjuncts, 24 conjunts are in the unsatisfiable core [2021-01-06 17:09:28,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 17:09:31,634 INFO L134 CoverageAnalysis]: Checked inductivity of 509043 backedges. 242787 proven. 36 refuted. 0 times theorem prover too weak. 266220 trivial. 0 not checked. [2021-01-06 17:09:31,635 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 17:09:31,635 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 17] total 21 [2021-01-06 17:09:31,635 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348221526] [2021-01-06 17:09:31,637 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-01-06 17:09:31,637 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 17:09:31,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-01-06 17:09:31,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=344, Unknown=0, NotChecked=0, Total=420 [2021-01-06 17:09:31,639 INFO L87 Difference]: Start difference. First operand 1689 states and 1818 transitions. Second operand 21 states. [2021-01-06 17:09:33,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 17:09:33,395 INFO L93 Difference]: Finished difference Result 4482 states and 4829 transitions. [2021-01-06 17:09:33,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-01-06 17:09:33,396 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1688 [2021-01-06 17:09:33,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 17:09:33,399 INFO L225 Difference]: With dead ends: 4482 [2021-01-06 17:09:33,399 INFO L226 Difference]: Without dead ends: 0 [2021-01-06 17:09:33,407 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 1737 GetRequests, 1674 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1221 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=524, Invalid=3636, Unknown=0, NotChecked=0, Total=4160 [2021-01-06 17:09:33,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-01-06 17:09:33,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-01-06 17:09:33,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2021-01-06 17:09:33,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-01-06 17:09:33,408 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 1688 [2021-01-06 17:09:33,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 17:09:33,409 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-01-06 17:09:33,409 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2021-01-06 17:09:33,409 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-01-06 17:09:33,409 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-01-06 17:09:33,623 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 17:09:33,627 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-01-06 17:09:34,693 WARN L197 SmtUtils]: Spent 1.06 s on a formula simplification. DAG size of input: 469 DAG size of output: 107 [2021-01-06 17:10:11,391 WARN L197 SmtUtils]: Spent 36.69 s on a formula simplification. DAG size of input: 2870 DAG size of output: 2116 [2021-01-06 17:10:11,736 WARN L197 SmtUtils]: Spent 312.00 ms on a formula simplification. DAG size of input: 105 DAG size of output: 11 [2021-01-06 17:11:54,391 WARN L197 SmtUtils]: Spent 1.71 m on a formula simplification. DAG size of input: 2032 DAG size of output: 29 [2021-01-06 17:11:54,514 INFO L189 CegarLoopUtils]: For program point L31-1(lines 31 33) no Hoare annotation was computed. [2021-01-06 17:11:54,514 INFO L189 CegarLoopUtils]: For program point L23-2(lines 23 29) no Hoare annotation was computed. [2021-01-06 17:11:54,514 INFO L185 CegarLoopUtils]: At program point L23-3(lines 23 29) the Hoare annotation is: (and (< ULTIMATE.start_main_~c~0 7) (< ULTIMATE.start_main_~a~0 6) (< ULTIMATE.start_main_~b~0 7) (<= 6 ULTIMATE.start_main_~c~0) (= ULTIMATE.start_main_~d~0 6)) [2021-01-06 17:11:54,514 INFO L189 CegarLoopUtils]: For program point L32(line 32) no Hoare annotation was computed. [2021-01-06 17:11:54,514 INFO L189 CegarLoopUtils]: For program point L-1(line -1) no Hoare annotation was computed. [2021-01-06 17:11:54,515 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2021-01-06 17:11:54,515 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2021-01-06 17:11:54,515 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 32) no Hoare annotation was computed. [2021-01-06 17:11:54,515 INFO L189 CegarLoopUtils]: For program point L24-2(lines 24 28) no Hoare annotation was computed. [2021-01-06 17:11:54,515 INFO L185 CegarLoopUtils]: At program point L24-3(lines 24 28) the Hoare annotation is: (and (< ULTIMATE.start_main_~c~0 7) (< ULTIMATE.start_main_~a~0 6) (< ULTIMATE.start_main_~b~0 6) (= ULTIMATE.start_main_~d~0 6)) [2021-01-06 17:11:54,515 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-01-06 17:11:54,515 INFO L189 CegarLoopUtils]: For program point L25-2(lines 25 27) no Hoare annotation was computed. [2021-01-06 17:11:54,515 INFO L185 CegarLoopUtils]: At program point L25-3(lines 25 27) the Hoare annotation is: (let ((.cse0 (< ULTIMATE.start_main_~a~0 6)) (.cse1 (< ULTIMATE.start_main_~b~0 6)) (.cse2 (< ULTIMATE.start_main_~c~0 6))) (or (and .cse0 .cse1 (= ULTIMATE.start_main_~d~0 1) .cse2) (and .cse0 .cse1 (= ULTIMATE.start_main_~d~0 0) .cse2) (and .cse0 .cse1 (= ULTIMATE.start_main_~d~0 5) .cse2) (and .cse0 .cse1 (= ULTIMATE.start_main_~d~0 2) .cse2) (and .cse0 .cse1 (= ULTIMATE.start_main_~d~0 6) .cse2) (and .cse0 (= ULTIMATE.start_main_~d~0 3) .cse1 .cse2) (and .cse0 (= ULTIMATE.start_main_~d~0 4) .cse1 .cse2))) [2021-01-06 17:11:54,516 INFO L192 CegarLoopUtils]: At program point L34(lines 15 35) the Hoare annotation is: true [2021-01-06 17:11:54,516 INFO L189 CegarLoopUtils]: For program point L22-2(lines 22 30) no Hoare annotation was computed. [2021-01-06 17:11:54,516 INFO L185 CegarLoopUtils]: At program point L22-3(lines 22 30) the Hoare annotation is: (and (< ULTIMATE.start_main_~c~0 7) (< ULTIMATE.start_main_~b~0 7) (<= 6 ULTIMATE.start_main_~b~0) (<= 6 ULTIMATE.start_main_~c~0) (= ULTIMATE.start_main_~d~0 6) (< ULTIMATE.start_main_~a~0 7)) [2021-01-06 17:11:54,516 INFO L189 CegarLoopUtils]: For program point L22-4(lines 15 35) no Hoare annotation was computed. [2021-01-06 17:11:54,537 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.01 05:11:54 BoogieIcfgContainer [2021-01-06 17:11:54,537 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-01-06 17:11:54,537 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-01-06 17:11:54,537 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-01-06 17:11:54,538 INFO L275 PluginConnector]: Witness Printer initialized [2021-01-06 17:11:54,538 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 05:09:00" (3/4) ... [2021-01-06 17:11:54,542 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-01-06 17:11:54,553 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2021-01-06 17:11:54,553 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2021-01-06 17:11:54,553 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-01-06 17:11:54,553 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-01-06 17:11:54,597 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/loop-simple/nested_4.c-witness.graphml [2021-01-06 17:11:54,597 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-01-06 17:11:54,598 INFO L168 Benchmark]: Toolchain (without parser) took 174513.33 ms. Allocated memory was 151.0 MB in the beginning and 1.8 GB in the end (delta: 1.6 GB). Free memory was 126.4 MB in the beginning and 1.1 GB in the end (delta: -931.1 MB). Peak memory consumption was 669.9 MB. Max. memory is 8.0 GB. [2021-01-06 17:11:54,599 INFO L168 Benchmark]: CDTParser took 0.29 ms. Allocated memory is still 151.0 MB. Free memory is still 123.9 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-01-06 17:11:54,600 INFO L168 Benchmark]: CACSL2BoogieTranslator took 366.99 ms. Allocated memory is still 151.0 MB. Free memory was 126.2 MB in the beginning and 116.9 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-01-06 17:11:54,600 INFO L168 Benchmark]: Boogie Procedure Inliner took 51.45 ms. Allocated memory is still 151.0 MB. Free memory was 116.7 MB in the beginning and 115.5 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-01-06 17:11:54,601 INFO L168 Benchmark]: Boogie Preprocessor took 53.45 ms. Allocated memory is still 151.0 MB. Free memory was 115.5 MB in the beginning and 114.4 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-01-06 17:11:54,601 INFO L168 Benchmark]: RCFGBuilder took 406.51 ms. Allocated memory is still 151.0 MB. Free memory was 114.2 MB in the beginning and 102.1 MB in the end (delta: 12.1 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. [2021-01-06 17:11:54,604 INFO L168 Benchmark]: TraceAbstraction took 173560.63 ms. Allocated memory was 151.0 MB in the beginning and 1.8 GB in the end (delta: 1.6 GB). Free memory was 101.6 MB in the beginning and 1.1 GB in the end (delta: -958.4 MB). Peak memory consumption was 1.1 GB. Max. memory is 8.0 GB. [2021-01-06 17:11:54,605 INFO L168 Benchmark]: Witness Printer took 59.77 ms. Allocated memory is still 1.8 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 2.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-01-06 17:11:54,607 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29 ms. Allocated memory is still 151.0 MB. Free memory is still 123.9 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 366.99 ms. Allocated memory is still 151.0 MB. Free memory was 126.2 MB in the beginning and 116.9 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 51.45 ms. Allocated memory is still 151.0 MB. Free memory was 116.7 MB in the beginning and 115.5 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 53.45 ms. Allocated memory is still 151.0 MB. Free memory was 115.5 MB in the beginning and 114.4 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 406.51 ms. Allocated memory is still 151.0 MB. Free memory was 114.2 MB in the beginning and 102.1 MB in the end (delta: 12.1 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. * TraceAbstraction took 173560.63 ms. Allocated memory was 151.0 MB in the beginning and 1.8 GB in the end (delta: 1.6 GB). Free memory was 101.6 MB in the beginning and 1.1 GB in the end (delta: -958.4 MB). Peak memory consumption was 1.1 GB. Max. memory is 8.0 GB. * Witness Printer took 59.77 ms. Allocated memory is still 1.8 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 2.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 32]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: ((c < 7 && a < 6) && b < 6) && d == 6 - InvariantResult [Line: 25]: Loop Invariant Derived loop invariant: ((((((((a < 6 && b < 6) && d == 1) && c < 6) || (((a < 6 && b < 6) && d == 0) && c < 6)) || (((a < 6 && b < 6) && d == 5) && c < 6)) || (((a < 6 && b < 6) && d == 2) && c < 6)) || (((a < 6 && b < 6) && d == 6) && c < 6)) || (((a < 6 && d == 3) && b < 6) && c < 6)) || (((a < 6 && d == 4) && b < 6) && c < 6) - InvariantResult [Line: 15]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 22]: Loop Invariant Derived loop invariant: ((((c < 7 && b < 7) && 6 <= b) && 6 <= c) && d == 6) && a < 7 - InvariantResult [Line: 23]: Loop Invariant Derived loop invariant: (((c < 7 && a < 6) && b < 7) && 6 <= c) && d == 6 - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 17 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 32.4s, OverallIterations: 20, TraceHistogramMax: 648, AutomataDifference: 3.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 140.8s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 268 SDtfs, 600 SDslu, 604 SDs, 0 SdLazy, 661 SolverSat, 168 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 6667 GetRequests, 6502 SyntacticMatches, 0 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1376 ImplicationChecksByTransitivity, 2.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=1689occurred in iteration=19, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.6s AutomataMinimizationTime, 20 MinimizatonAttempts, 1518 StatesRemovedByMinimization, 15 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 5 LocationsWithAnnotation, 5 PreInvPairs, 1517 NumberOfFragments, 141 HoareAnnotationTreeSize, 5 FomulaSimplifications, 1116681 FormulaSimplificationTreeSizeReduction, 37.7s HoareSimplificationTime, 5 FomulaSimplificationsInter, 99988 FormulaSimplificationTreeSizeReductionInter, 103.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.8s SsaConstructionTime, 5.1s SatisfiabilityAnalysisTime, 12.8s InterpolantComputationTime, 13057 NumberOfCodeBlocks, 11607 NumberOfCodeBlocksAsserted, 554 NumberOfCheckSat, 13022 ConstructedInterpolants, 0 QuantifiedInterpolants, 27946893 SizeOfPredicates, 4 NumberOfNonLiveVariables, 8601 ConjunctsInSsa, 95 ConjunctsInUnsatCore, 35 InterpolantComputations, 5 PerfectInterpolantSequences, 1935203/2423578 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 correct! Received shutdown request...