/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-acceleration/array_2-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-dcfa08f [2020-12-23 06:47:05,807 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-23 06:47:05,809 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-23 06:47:05,868 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-23 06:47:05,869 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-23 06:47:05,873 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-23 06:47:05,877 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-23 06:47:05,883 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-23 06:47:05,886 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-23 06:47:05,892 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-23 06:47:05,896 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-23 06:47:05,898 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-23 06:47:05,899 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-23 06:47:05,902 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-23 06:47:05,904 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-23 06:47:05,906 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-23 06:47:05,907 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-23 06:47:05,910 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-23 06:47:05,918 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-23 06:47:05,935 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-23 06:47:05,938 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-23 06:47:05,940 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-23 06:47:05,941 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-23 06:47:05,944 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-23 06:47:05,960 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-23 06:47:05,978 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-23 06:47:05,979 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-23 06:47:05,979 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-23 06:47:05,983 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-23 06:47:06,009 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-23 06:47:06,010 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-23 06:47:06,011 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-23 06:47:06,011 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-23 06:47:06,012 INFO L138 SettingsManager]: * Use SBE=true [2020-12-23 06:47:06,012 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-23 06:47:06,012 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-23 06:47:06,012 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-23 06:47:06,013 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-23 06:47:06,013 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-23 06:47:06,013 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-23 06:47:06,013 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-23 06:47:06,013 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-23 06:47:06,014 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-23 06:47:06,014 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-23 06:47:06,014 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-23 06:47:06,014 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-23 06:47:06,015 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 06:47:06,015 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-23 06:47:06,015 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-23 06:47:06,015 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-23 06:47:06,015 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-23 06:47:06,016 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-23 06:47:06,016 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-23 06:47:06,016 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-23 06:47:06,016 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-23 06:47:06,422 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-23 06:47:06,452 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-23 06:47:06,455 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-23 06:47:06,457 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-23 06:47:06,458 INFO L275 PluginConnector]: CDTParser initialized [2020-12-23 06:47:06,459 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-acceleration/array_2-1.i [2020-12-23 06:47:06,551 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/774fc015a/ea1b680a8f74435e85ba997960040b1c/FLAG9a91d7d0f [2020-12-23 06:47:07,230 INFO L306 CDTParser]: Found 1 translation units. [2020-12-23 06:47:07,231 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loop-acceleration/array_2-1.i [2020-12-23 06:47:07,239 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/774fc015a/ea1b680a8f74435e85ba997960040b1c/FLAG9a91d7d0f [2020-12-23 06:47:07,599 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/774fc015a/ea1b680a8f74435e85ba997960040b1c [2020-12-23 06:47:07,602 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-23 06:47:07,607 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-23 06:47:07,612 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-23 06:47:07,612 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-23 06:47:07,616 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-23 06:47:07,617 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 06:47:07" (1/1) ... [2020-12-23 06:47:07,619 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@74e1f620 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:47:07, skipping insertion in model container [2020-12-23 06:47:07,619 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 06:47:07" (1/1) ... [2020-12-23 06:47:07,628 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-23 06:47:07,649 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-23 06:47:07,844 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-acceleration/array_2-1.i[849,862] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~A~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~B~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~tmp~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~B~0,],[IdentifierExpression[~i~0,]]] [2020-12-23 06:47:07,864 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 06:47:07,877 INFO L203 MainTranslator]: Completed pre-run [2020-12-23 06:47:07,894 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-acceleration/array_2-1.i[849,862] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#A~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#A~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],IdentifierExpression[~i~0,]]]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#B~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#B~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],IdentifierExpression[~i~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~tmp~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#B~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#B~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],IdentifierExpression[~i~0,]]]]] [2020-12-23 06:47:07,902 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 06:47:07,920 INFO L208 MainTranslator]: Completed translation [2020-12-23 06:47:07,920 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:47:07 WrapperNode [2020-12-23 06:47:07,920 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-23 06:47:07,922 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-23 06:47:07,922 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-23 06:47:07,922 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-23 06:47:07,932 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:47:07" (1/1) ... [2020-12-23 06:47:07,941 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:47:07" (1/1) ... [2020-12-23 06:47:07,964 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-23 06:47:07,965 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-23 06:47:07,965 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-23 06:47:07,965 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-23 06:47:07,975 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:47:07" (1/1) ... [2020-12-23 06:47:07,975 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:47:07" (1/1) ... [2020-12-23 06:47:07,977 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:47:07" (1/1) ... [2020-12-23 06:47:07,978 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:47:07" (1/1) ... [2020-12-23 06:47:07,984 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:47:07" (1/1) ... [2020-12-23 06:47:07,989 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:47:07" (1/1) ... [2020-12-23 06:47:07,991 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:47:07" (1/1) ... [2020-12-23 06:47:07,993 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-23 06:47:07,994 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-23 06:47:07,994 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-23 06:47:07,994 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-23 06:47:07,995 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:47:07" (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 [2020-12-23 06:47:08,136 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-23 06:47:08,137 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-23 06:47:08,137 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-23 06:47:08,137 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-23 06:47:08,137 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-23 06:47:08,137 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-23 06:47:08,137 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-23 06:47:08,381 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-23 06:47:08,381 INFO L299 CfgBuilder]: Removed 8 assume(true) statements. [2020-12-23 06:47:08,383 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 06:47:08 BoogieIcfgContainer [2020-12-23 06:47:08,383 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-23 06:47:08,385 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-23 06:47:08,385 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-23 06:47:08,389 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-23 06:47:08,389 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.12 06:47:07" (1/3) ... [2020-12-23 06:47:08,390 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@706b9f3c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 06:47:08, skipping insertion in model container [2020-12-23 06:47:08,390 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:47:07" (2/3) ... [2020-12-23 06:47:08,391 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@706b9f3c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 06:47:08, skipping insertion in model container [2020-12-23 06:47:08,391 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 06:47:08" (3/3) ... [2020-12-23 06:47:08,392 INFO L111 eAbstractionObserver]: Analyzing ICFG array_2-1.i [2020-12-23 06:47:08,400 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-23 06:47:08,405 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-23 06:47:08,428 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-23 06:47:08,462 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-23 06:47:08,463 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-23 06:47:08,463 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-23 06:47:08,463 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-23 06:47:08,463 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-23 06:47:08,464 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-23 06:47:08,464 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-23 06:47:08,464 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-23 06:47:08,481 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2020-12-23 06:47:08,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-23 06:47:08,487 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:47:08,487 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:47:08,488 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:47:08,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:47:08,496 INFO L82 PathProgramCache]: Analyzing trace with hash 212047733, now seen corresponding path program 1 times [2020-12-23 06:47:08,510 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:47:08,513 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1840910293] [2020-12-23 06:47:08,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:47:08,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:47:08,867 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:47:08,869 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1840910293] [2020-12-23 06:47:08,870 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 06:47:08,871 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-23 06:47:08,872 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105652894] [2020-12-23 06:47:08,879 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 06:47:08,880 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:47:08,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 06:47:08,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 06:47:08,909 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 3 states. [2020-12-23 06:47:09,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:47:09,006 INFO L93 Difference]: Finished difference Result 30 states and 40 transitions. [2020-12-23 06:47:09,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 06:47:09,011 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 8 [2020-12-23 06:47:09,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:47:09,028 INFO L225 Difference]: With dead ends: 30 [2020-12-23 06:47:09,029 INFO L226 Difference]: Without dead ends: 15 [2020-12-23 06:47:09,032 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 06:47:09,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-12-23 06:47:09,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 13. [2020-12-23 06:47:09,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-12-23 06:47:09,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-12-23 06:47:09,078 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 8 [2020-12-23 06:47:09,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:47:09,079 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-12-23 06:47:09,079 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 06:47:09,079 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-12-23 06:47:09,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-23 06:47:09,082 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:47:09,082 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:47:09,083 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-23 06:47:09,084 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:47:09,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:47:09,089 INFO L82 PathProgramCache]: Analyzing trace with hash 1312443705, now seen corresponding path program 1 times [2020-12-23 06:47:09,090 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:47:09,090 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [182682914] [2020-12-23 06:47:09,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:47:09,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:47:09,167 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 06:47:09,168 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [182682914] [2020-12-23 06:47:09,168 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [347008737] [2020-12-23 06:47:09,168 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 [2020-12-23 06:47:09,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:47:09,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-23 06:47:09,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:47:09,339 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 06:47:09,340 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:47:09,340 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-23 06:47:09,342 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843118279] [2020-12-23 06:47:09,342 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-23 06:47:09,343 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:47:09,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-23 06:47:09,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-23 06:47:09,344 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 5 states. [2020-12-23 06:47:09,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:47:09,408 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2020-12-23 06:47:09,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 06:47:09,410 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-12-23 06:47:09,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:47:09,411 INFO L225 Difference]: With dead ends: 27 [2020-12-23 06:47:09,411 INFO L226 Difference]: Without dead ends: 19 [2020-12-23 06:47:09,412 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-23 06:47:09,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-23 06:47:09,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2020-12-23 06:47:09,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-23 06:47:09,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-12-23 06:47:09,418 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 12 [2020-12-23 06:47:09,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:47:09,418 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-12-23 06:47:09,418 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-23 06:47:09,419 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-12-23 06:47:09,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-23 06:47:09,419 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:47:09,420 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:47:09,633 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-23 06:47:09,634 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:47:09,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:47:09,636 INFO L82 PathProgramCache]: Analyzing trace with hash 2052428029, now seen corresponding path program 2 times [2020-12-23 06:47:09,636 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:47:09,637 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [454167537] [2020-12-23 06:47:09,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:47:09,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:47:09,712 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-23 06:47:09,712 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [454167537] [2020-12-23 06:47:09,713 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1803574595] [2020-12-23 06:47:09,713 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 [2020-12-23 06:47:09,807 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:47:09,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:47:09,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-23 06:47:09,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:47:09,844 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-23 06:47:09,845 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:47:09,845 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-23 06:47:09,845 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248164324] [2020-12-23 06:47:09,846 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 06:47:09,846 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:47:09,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 06:47:09,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 06:47:09,847 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 6 states. [2020-12-23 06:47:09,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:47:09,893 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2020-12-23 06:47:09,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-23 06:47:09,894 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-12-23 06:47:09,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:47:09,895 INFO L225 Difference]: With dead ends: 33 [2020-12-23 06:47:09,895 INFO L226 Difference]: Without dead ends: 23 [2020-12-23 06:47:09,896 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 06:47:09,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-12-23 06:47:09,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-12-23 06:47:09,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-12-23 06:47:09,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-12-23 06:47:09,901 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 16 [2020-12-23 06:47:09,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:47:09,901 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-12-23 06:47:09,902 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 06:47:09,902 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-12-23 06:47:09,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-12-23 06:47:09,903 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:47:09,903 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:47:10,116 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:47:10,117 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:47:10,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:47:10,119 INFO L82 PathProgramCache]: Analyzing trace with hash -319135039, now seen corresponding path program 3 times [2020-12-23 06:47:10,119 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:47:10,120 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1444496994] [2020-12-23 06:47:10,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:47:10,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:47:10,190 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-23 06:47:10,191 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1444496994] [2020-12-23 06:47:10,191 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [467288830] [2020-12-23 06:47:10,191 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 [2020-12-23 06:47:10,263 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-12-23 06:47:10,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:47:10,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-23 06:47:10,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:47:10,303 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-23 06:47:10,304 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:47:10,304 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-23 06:47:10,304 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563976270] [2020-12-23 06:47:10,305 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-23 06:47:10,305 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:47:10,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-23 06:47:10,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-23 06:47:10,306 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2020-12-23 06:47:10,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:47:10,358 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2020-12-23 06:47:10,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-23 06:47:10,359 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 20 [2020-12-23 06:47:10,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:47:10,360 INFO L225 Difference]: With dead ends: 39 [2020-12-23 06:47:10,360 INFO L226 Difference]: Without dead ends: 27 [2020-12-23 06:47:10,361 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-23 06:47:10,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-12-23 06:47:10,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2020-12-23 06:47:10,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-23 06:47:10,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-12-23 06:47:10,366 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 20 [2020-12-23 06:47:10,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:47:10,367 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-12-23 06:47:10,367 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-23 06:47:10,367 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-12-23 06:47:10,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-23 06:47:10,368 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:47:10,368 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:47:10,581 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:47:10,582 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:47:10,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:47:10,583 INFO L82 PathProgramCache]: Analyzing trace with hash 682476165, now seen corresponding path program 4 times [2020-12-23 06:47:10,584 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:47:10,584 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719467785] [2020-12-23 06:47:10,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:47:10,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:47:10,659 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-23 06:47:10,660 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719467785] [2020-12-23 06:47:10,660 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [622229375] [2020-12-23 06:47:10,660 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 [2020-12-23 06:47:10,711 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:47:10,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:47:10,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-23 06:47:10,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:47:10,774 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-23 06:47:10,775 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:47:10,775 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-23 06:47:10,775 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362831660] [2020-12-23 06:47:10,777 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-23 06:47:10,777 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:47:10,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-23 06:47:10,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-23 06:47:10,778 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 8 states. [2020-12-23 06:47:10,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:47:10,861 INFO L93 Difference]: Finished difference Result 45 states and 48 transitions. [2020-12-23 06:47:10,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-23 06:47:10,862 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-12-23 06:47:10,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:47:10,863 INFO L225 Difference]: With dead ends: 45 [2020-12-23 06:47:10,863 INFO L226 Difference]: Without dead ends: 31 [2020-12-23 06:47:10,864 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-23 06:47:10,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-12-23 06:47:10,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2020-12-23 06:47:10,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-12-23 06:47:10,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-12-23 06:47:10,870 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 24 [2020-12-23 06:47:10,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:47:10,870 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-12-23 06:47:10,870 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-23 06:47:10,871 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-12-23 06:47:10,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-12-23 06:47:10,871 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:47:10,872 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:47:11,085 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:47:11,087 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:47:11,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:47:11,088 INFO L82 PathProgramCache]: Analyzing trace with hash 1450487881, now seen corresponding path program 5 times [2020-12-23 06:47:11,088 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:47:11,089 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [183620467] [2020-12-23 06:47:11,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:47:11,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:47:11,204 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-12-23 06:47:11,205 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [183620467] [2020-12-23 06:47:11,205 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1146436330] [2020-12-23 06:47:11,205 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 [2020-12-23 06:47:11,580 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-12-23 06:47:11,581 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:47:11,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-23 06:47:11,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:47:11,642 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-12-23 06:47:11,643 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:47:11,643 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-23 06:47:11,643 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376789155] [2020-12-23 06:47:11,644 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-23 06:47:11,644 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:47:11,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-23 06:47:11,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-23 06:47:11,645 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-12-23 06:47:11,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:47:11,710 INFO L93 Difference]: Finished difference Result 51 states and 54 transitions. [2020-12-23 06:47:11,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-23 06:47:11,712 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-12-23 06:47:11,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:47:11,713 INFO L225 Difference]: With dead ends: 51 [2020-12-23 06:47:11,714 INFO L226 Difference]: Without dead ends: 35 [2020-12-23 06:47:11,714 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-23 06:47:11,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-12-23 06:47:11,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2020-12-23 06:47:11,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-12-23 06:47:11,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-12-23 06:47:11,720 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 28 [2020-12-23 06:47:11,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:47:11,721 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-12-23 06:47:11,721 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-23 06:47:11,721 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-12-23 06:47:11,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-12-23 06:47:11,722 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:47:11,722 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:47:11,935 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-23 06:47:11,936 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:47:11,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:47:11,937 INFO L82 PathProgramCache]: Analyzing trace with hash -975950835, now seen corresponding path program 6 times [2020-12-23 06:47:11,938 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:47:11,938 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [340790452] [2020-12-23 06:47:11,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:47:11,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:47:12,076 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-23 06:47:12,077 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [340790452] [2020-12-23 06:47:12,077 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1914086822] [2020-12-23 06:47:12,077 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 [2020-12-23 06:47:12,253 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-23 06:47:12,253 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:47:12,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-23 06:47:12,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:47:12,364 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-23 06:47:12,364 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:47:12,364 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-23 06:47:12,365 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884146893] [2020-12-23 06:47:12,365 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-23 06:47:12,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:47:12,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-23 06:47:12,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-23 06:47:12,367 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 10 states. [2020-12-23 06:47:12,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:47:12,448 INFO L93 Difference]: Finished difference Result 57 states and 60 transitions. [2020-12-23 06:47:12,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-23 06:47:12,448 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2020-12-23 06:47:12,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:47:12,449 INFO L225 Difference]: With dead ends: 57 [2020-12-23 06:47:12,449 INFO L226 Difference]: Without dead ends: 39 [2020-12-23 06:47:12,450 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-23 06:47:12,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-12-23 06:47:12,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2020-12-23 06:47:12,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-12-23 06:47:12,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-12-23 06:47:12,456 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 32 [2020-12-23 06:47:12,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:47:12,456 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-12-23 06:47:12,456 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-23 06:47:12,456 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-12-23 06:47:12,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-23 06:47:12,457 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:47:12,458 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:47:12,670 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:47:12,671 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:47:12,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:47:12,672 INFO L82 PathProgramCache]: Analyzing trace with hash 1825650129, now seen corresponding path program 7 times [2020-12-23 06:47:12,673 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:47:12,673 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643878091] [2020-12-23 06:47:12,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:47:12,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:47:12,780 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-12-23 06:47:12,780 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643878091] [2020-12-23 06:47:12,780 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1557710113] [2020-12-23 06:47:12,781 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 [2020-12-23 06:47:12,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:47:12,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-23 06:47:12,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:47:12,915 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-12-23 06:47:12,916 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:47:12,916 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-23 06:47:12,916 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347616232] [2020-12-23 06:47:12,917 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-23 06:47:12,917 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:47:12,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-23 06:47:12,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-23 06:47:12,918 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 11 states. [2020-12-23 06:47:13,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:47:13,042 INFO L93 Difference]: Finished difference Result 63 states and 66 transitions. [2020-12-23 06:47:13,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-23 06:47:13,043 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 36 [2020-12-23 06:47:13,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:47:13,043 INFO L225 Difference]: With dead ends: 63 [2020-12-23 06:47:13,044 INFO L226 Difference]: Without dead ends: 43 [2020-12-23 06:47:13,044 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-23 06:47:13,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-12-23 06:47:13,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41. [2020-12-23 06:47:13,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-12-23 06:47:13,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-12-23 06:47:13,050 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 36 [2020-12-23 06:47:13,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:47:13,050 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-12-23 06:47:13,050 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-23 06:47:13,050 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-12-23 06:47:13,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-12-23 06:47:13,051 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:47:13,051 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:47:13,264 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:47:13,265 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:47:13,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:47:13,266 INFO L82 PathProgramCache]: Analyzing trace with hash 1743834517, now seen corresponding path program 8 times [2020-12-23 06:47:13,267 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:47:13,267 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687352543] [2020-12-23 06:47:13,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:47:13,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:47:13,396 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-23 06:47:13,397 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687352543] [2020-12-23 06:47:13,399 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2050202515] [2020-12-23 06:47:13,400 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 [2020-12-23 06:47:13,472 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:47:13,472 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:47:13,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-23 06:47:13,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:47:13,554 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-23 06:47:13,554 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:47:13,554 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-23 06:47:13,557 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474489707] [2020-12-23 06:47:13,558 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-23 06:47:13,559 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:47:13,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-23 06:47:13,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-23 06:47:13,560 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 12 states. [2020-12-23 06:47:13,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:47:13,660 INFO L93 Difference]: Finished difference Result 69 states and 72 transitions. [2020-12-23 06:47:13,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-23 06:47:13,661 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-12-23 06:47:13,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:47:13,665 INFO L225 Difference]: With dead ends: 69 [2020-12-23 06:47:13,665 INFO L226 Difference]: Without dead ends: 47 [2020-12-23 06:47:13,666 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-23 06:47:13,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-12-23 06:47:13,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 45. [2020-12-23 06:47:13,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-12-23 06:47:13,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-12-23 06:47:13,688 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 40 [2020-12-23 06:47:13,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:47:13,688 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-12-23 06:47:13,688 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-23 06:47:13,688 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-12-23 06:47:13,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-12-23 06:47:13,689 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:47:13,689 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:47:13,905 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-23 06:47:13,906 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:47:13,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:47:13,907 INFO L82 PathProgramCache]: Analyzing trace with hash 2050487129, now seen corresponding path program 9 times [2020-12-23 06:47:13,908 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:47:13,908 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1769422544] [2020-12-23 06:47:13,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:47:13,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:47:14,074 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-12-23 06:47:14,075 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1769422544] [2020-12-23 06:47:14,075 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1261249391] [2020-12-23 06:47:14,075 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 [2020-12-23 06:47:15,707 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2020-12-23 06:47:15,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:47:15,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 20 conjunts are in the unsatisfiable core [2020-12-23 06:47:15,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:47:15,805 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-12-23 06:47:15,805 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:47:15,805 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2020-12-23 06:47:15,806 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585643119] [2020-12-23 06:47:15,806 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-23 06:47:15,806 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:47:15,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-23 06:47:15,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-23 06:47:15,808 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 13 states. [2020-12-23 06:47:15,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:47:15,921 INFO L93 Difference]: Finished difference Result 75 states and 78 transitions. [2020-12-23 06:47:15,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-23 06:47:15,922 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 44 [2020-12-23 06:47:15,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:47:15,923 INFO L225 Difference]: With dead ends: 75 [2020-12-23 06:47:15,923 INFO L226 Difference]: Without dead ends: 51 [2020-12-23 06:47:15,924 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-23 06:47:15,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-12-23 06:47:15,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 49. [2020-12-23 06:47:15,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-12-23 06:47:15,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2020-12-23 06:47:15,928 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 44 [2020-12-23 06:47:15,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:47:15,928 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2020-12-23 06:47:15,929 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-23 06:47:15,929 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2020-12-23 06:47:15,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-12-23 06:47:15,930 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:47:15,930 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:47:16,145 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:47:16,146 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:47:16,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:47:16,147 INFO L82 PathProgramCache]: Analyzing trace with hash -1926519011, now seen corresponding path program 10 times [2020-12-23 06:47:16,147 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:47:16,148 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [658335912] [2020-12-23 06:47:16,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:47:16,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:47:16,289 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-23 06:47:16,289 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [658335912] [2020-12-23 06:47:16,290 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [435425589] [2020-12-23 06:47:16,290 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 [2020-12-23 06:47:16,371 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:47:16,371 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:47:16,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-23 06:47:16,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:47:16,453 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-23 06:47:16,454 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:47:16,454 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-12-23 06:47:16,455 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594843190] [2020-12-23 06:47:16,455 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-23 06:47:16,455 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:47:16,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-23 06:47:16,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-23 06:47:16,456 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 14 states. [2020-12-23 06:47:16,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:47:16,561 INFO L93 Difference]: Finished difference Result 81 states and 84 transitions. [2020-12-23 06:47:16,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-23 06:47:16,562 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 48 [2020-12-23 06:47:16,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:47:16,563 INFO L225 Difference]: With dead ends: 81 [2020-12-23 06:47:16,563 INFO L226 Difference]: Without dead ends: 55 [2020-12-23 06:47:16,564 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-23 06:47:16,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-12-23 06:47:16,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 53. [2020-12-23 06:47:16,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-12-23 06:47:16,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2020-12-23 06:47:16,569 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 48 [2020-12-23 06:47:16,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:47:16,569 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2020-12-23 06:47:16,569 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-23 06:47:16,569 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2020-12-23 06:47:16,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-12-23 06:47:16,570 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:47:16,570 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:47:16,784 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:47:16,785 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:47:16,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:47:16,786 INFO L82 PathProgramCache]: Analyzing trace with hash 818997473, now seen corresponding path program 11 times [2020-12-23 06:47:16,787 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:47:16,787 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1891594268] [2020-12-23 06:47:16,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:47:16,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:47:16,943 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2020-12-23 06:47:16,943 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1891594268] [2020-12-23 06:47:16,943 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1026586466] [2020-12-23 06:47:16,944 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 [2020-12-23 06:47:28,190 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2020-12-23 06:47:28,191 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:47:28,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-23 06:47:28,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:47:28,287 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2020-12-23 06:47:28,287 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:47:28,288 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-23 06:47:28,288 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122521591] [2020-12-23 06:47:28,288 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-23 06:47:28,289 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:47:28,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-23 06:47:28,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-23 06:47:28,290 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 15 states. [2020-12-23 06:47:28,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:47:28,397 INFO L93 Difference]: Finished difference Result 87 states and 90 transitions. [2020-12-23 06:47:28,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-23 06:47:28,398 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 52 [2020-12-23 06:47:28,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:47:28,398 INFO L225 Difference]: With dead ends: 87 [2020-12-23 06:47:28,399 INFO L226 Difference]: Without dead ends: 59 [2020-12-23 06:47:28,399 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-23 06:47:28,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-12-23 06:47:28,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 57. [2020-12-23 06:47:28,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-12-23 06:47:28,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-12-23 06:47:28,405 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 52 [2020-12-23 06:47:28,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:47:28,405 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-12-23 06:47:28,405 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-23 06:47:28,405 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-12-23 06:47:28,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-12-23 06:47:28,406 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:47:28,407 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:47:28,619 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-23 06:47:28,620 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:47:28,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:47:28,621 INFO L82 PathProgramCache]: Analyzing trace with hash 464304293, now seen corresponding path program 12 times [2020-12-23 06:47:28,621 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:47:28,621 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724413191] [2020-12-23 06:47:28,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:47:28,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:47:28,858 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-12-23 06:47:28,859 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724413191] [2020-12-23 06:47:28,859 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1380946069] [2020-12-23 06:47:28,859 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 [2020-12-23 06:47:33,858 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-12-23 06:47:33,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:47:33,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 31 conjunts are in the unsatisfiable core [2020-12-23 06:47:33,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:47:34,019 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 23 proven. 144 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2020-12-23 06:47:34,019 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:47:34,019 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 17] total 18 [2020-12-23 06:47:34,020 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52708252] [2020-12-23 06:47:34,050 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-23 06:47:34,050 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:47:34,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-23 06:47:34,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-23 06:47:34,054 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 18 states. [2020-12-23 06:47:34,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:47:34,196 INFO L93 Difference]: Finished difference Result 95 states and 100 transitions. [2020-12-23 06:47:34,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-23 06:47:34,197 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2020-12-23 06:47:34,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:47:34,198 INFO L225 Difference]: With dead ends: 95 [2020-12-23 06:47:34,198 INFO L226 Difference]: Without dead ends: 65 [2020-12-23 06:47:34,200 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-23 06:47:34,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-12-23 06:47:34,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2020-12-23 06:47:34,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-12-23 06:47:34,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 66 transitions. [2020-12-23 06:47:34,210 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 66 transitions. Word has length 56 [2020-12-23 06:47:34,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:47:34,210 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 66 transitions. [2020-12-23 06:47:34,210 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-23 06:47:34,210 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 66 transitions. [2020-12-23 06:47:34,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-12-23 06:47:34,211 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:47:34,211 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:47:34,413 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-23 06:47:34,413 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:47:34,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:47:34,414 INFO L82 PathProgramCache]: Analyzing trace with hash 1637614125, now seen corresponding path program 13 times [2020-12-23 06:47:34,415 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:47:34,415 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502577123] [2020-12-23 06:47:34,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:47:34,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:47:34,671 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-23 06:47:34,672 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502577123] [2020-12-23 06:47:34,672 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2103475840] [2020-12-23 06:47:34,672 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 [2020-12-23 06:47:34,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:47:34,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-23 06:47:34,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:47:34,848 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-12-23 06:47:34,848 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:47:34,848 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-23 06:47:34,849 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335612810] [2020-12-23 06:47:34,849 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-23 06:47:34,849 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:47:34,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-23 06:47:34,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-23 06:47:34,851 INFO L87 Difference]: Start difference. First operand 65 states and 66 transitions. Second operand 18 states. [2020-12-23 06:47:35,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:47:35,009 INFO L93 Difference]: Finished difference Result 105 states and 108 transitions. [2020-12-23 06:47:35,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-23 06:47:35,009 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 64 [2020-12-23 06:47:35,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:47:35,010 INFO L225 Difference]: With dead ends: 105 [2020-12-23 06:47:35,010 INFO L226 Difference]: Without dead ends: 71 [2020-12-23 06:47:35,011 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-23 06:47:35,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-12-23 06:47:35,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 69. [2020-12-23 06:47:35,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-12-23 06:47:35,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2020-12-23 06:47:35,016 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 64 [2020-12-23 06:47:35,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:47:35,017 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2020-12-23 06:47:35,017 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-23 06:47:35,017 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2020-12-23 06:47:35,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-12-23 06:47:35,018 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:47:35,018 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:47:35,232 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-23 06:47:35,233 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:47:35,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:47:35,234 INFO L82 PathProgramCache]: Analyzing trace with hash 1782152177, now seen corresponding path program 14 times [2020-12-23 06:47:35,234 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:47:35,234 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800431039] [2020-12-23 06:47:35,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:47:35,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:47:35,449 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2020-12-23 06:47:35,449 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800431039] [2020-12-23 06:47:35,449 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [204189793] [2020-12-23 06:47:35,449 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 [2020-12-23 06:47:35,537 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:47:35,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:47:35,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-23 06:47:35,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:47:35,631 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2020-12-23 06:47:35,632 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:47:35,632 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2020-12-23 06:47:35,632 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1392900864] [2020-12-23 06:47:35,632 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-23 06:47:35,632 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:47:35,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-23 06:47:35,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-23 06:47:35,634 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 19 states. [2020-12-23 06:47:35,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:47:35,795 INFO L93 Difference]: Finished difference Result 111 states and 114 transitions. [2020-12-23 06:47:35,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-23 06:47:35,796 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 68 [2020-12-23 06:47:35,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:47:35,797 INFO L225 Difference]: With dead ends: 111 [2020-12-23 06:47:35,797 INFO L226 Difference]: Without dead ends: 75 [2020-12-23 06:47:35,798 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-23 06:47:35,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-12-23 06:47:35,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2020-12-23 06:47:35,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-12-23 06:47:35,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 74 transitions. [2020-12-23 06:47:35,806 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 74 transitions. Word has length 68 [2020-12-23 06:47:35,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:47:35,806 INFO L481 AbstractCegarLoop]: Abstraction has 73 states and 74 transitions. [2020-12-23 06:47:35,806 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-23 06:47:35,806 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 74 transitions. [2020-12-23 06:47:35,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-12-23 06:47:35,807 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:47:35,807 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:47:36,020 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:47:36,021 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:47:36,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:47:36,022 INFO L82 PathProgramCache]: Analyzing trace with hash 354517941, now seen corresponding path program 15 times [2020-12-23 06:47:36,022 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:47:36,023 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201563270] [2020-12-23 06:47:36,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:47:36,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:47:36,306 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2020-12-23 06:47:36,306 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1201563270] [2020-12-23 06:47:36,308 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [812321907] [2020-12-23 06:47:36,308 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 [2020-12-23 06:47:53,243 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2020-12-23 06:47:53,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:47:53,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-23 06:47:53,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:47:53,368 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2020-12-23 06:47:53,369 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:47:53,369 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-12-23 06:47:53,369 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462079214] [2020-12-23 06:47:53,370 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-23 06:47:53,370 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:47:53,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-23 06:47:53,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-23 06:47:53,371 INFO L87 Difference]: Start difference. First operand 73 states and 74 transitions. Second operand 20 states. [2020-12-23 06:47:53,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:47:53,541 INFO L93 Difference]: Finished difference Result 117 states and 120 transitions. [2020-12-23 06:47:53,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-23 06:47:53,542 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 72 [2020-12-23 06:47:53,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:47:53,557 INFO L225 Difference]: With dead ends: 117 [2020-12-23 06:47:53,557 INFO L226 Difference]: Without dead ends: 79 [2020-12-23 06:47:53,558 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-23 06:47:53,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-12-23 06:47:53,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 77. [2020-12-23 06:47:53,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-12-23 06:47:53,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2020-12-23 06:47:53,563 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 72 [2020-12-23 06:47:53,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:47:53,564 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2020-12-23 06:47:53,564 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-23 06:47:53,564 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2020-12-23 06:47:53,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-12-23 06:47:53,565 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:47:53,565 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:47:53,779 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-23 06:47:53,780 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:47:53,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:47:53,781 INFO L82 PathProgramCache]: Analyzing trace with hash 1499011449, now seen corresponding path program 16 times [2020-12-23 06:47:53,782 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:47:53,782 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1038576050] [2020-12-23 06:47:53,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:47:53,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:47:54,069 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2020-12-23 06:47:54,070 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1038576050] [2020-12-23 06:47:54,070 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [843133227] [2020-12-23 06:47:54,070 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:47:54,175 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:47:54,175 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:47:54,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-23 06:47:54,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:47:54,282 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2020-12-23 06:47:54,283 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:47:54,283 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2020-12-23 06:47:54,284 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107849614] [2020-12-23 06:47:54,284 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-23 06:47:54,284 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:47:54,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-23 06:47:54,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-23 06:47:54,286 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand 21 states. [2020-12-23 06:47:54,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:47:54,472 INFO L93 Difference]: Finished difference Result 123 states and 126 transitions. [2020-12-23 06:47:54,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-23 06:47:54,473 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 76 [2020-12-23 06:47:54,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:47:54,474 INFO L225 Difference]: With dead ends: 123 [2020-12-23 06:47:54,475 INFO L226 Difference]: Without dead ends: 83 [2020-12-23 06:47:54,476 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-23 06:47:54,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-12-23 06:47:54,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 81. [2020-12-23 06:47:54,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-12-23 06:47:54,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2020-12-23 06:47:54,480 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 76 [2020-12-23 06:47:54,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:47:54,480 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2020-12-23 06:47:54,481 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-23 06:47:54,481 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2020-12-23 06:47:54,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-12-23 06:47:54,482 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:47:54,482 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:47:54,696 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-23 06:47:54,697 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:47:54,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:47:54,698 INFO L82 PathProgramCache]: Analyzing trace with hash 1415920957, now seen corresponding path program 17 times [2020-12-23 06:47:54,698 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:47:54,699 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [582868258] [2020-12-23 06:47:54,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:47:54,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:47:54,989 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2020-12-23 06:47:54,989 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [582868258] [2020-12-23 06:47:54,990 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1996856921] [2020-12-23 06:47:54,990 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true