/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/array-examples/standard_strcpy_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-178dd20 [2021-01-06 10:01:06,938 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-01-06 10:01:06,941 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-01-06 10:01:06,983 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-01-06 10:01:06,984 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-01-06 10:01:06,986 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-01-06 10:01:06,988 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-01-06 10:01:06,991 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-01-06 10:01:06,993 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-01-06 10:01:06,994 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-01-06 10:01:06,996 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-01-06 10:01:06,998 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-01-06 10:01:06,998 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-01-06 10:01:07,000 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-01-06 10:01:07,001 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-01-06 10:01:07,003 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-01-06 10:01:07,004 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-01-06 10:01:07,005 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-01-06 10:01:07,008 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-01-06 10:01:07,011 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-01-06 10:01:07,013 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-01-06 10:01:07,015 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-01-06 10:01:07,017 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-01-06 10:01:07,019 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-01-06 10:01:07,023 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-01-06 10:01:07,048 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-01-06 10:01:07,050 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-01-06 10:01:07,051 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-01-06 10:01:07,053 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2021-01-06 10:01:07,082 INFO L113 SettingsManager]: Loading preferences was successful [2021-01-06 10:01:07,083 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-01-06 10:01:07,088 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-01-06 10:01:07,090 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-01-06 10:01:07,091 INFO L138 SettingsManager]: * Use SBE=true [2021-01-06 10:01:07,091 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-01-06 10:01:07,091 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-01-06 10:01:07,092 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-01-06 10:01:07,092 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-01-06 10:01:07,092 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-01-06 10:01:07,092 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-01-06 10:01:07,093 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-01-06 10:01:07,093 INFO L138 SettingsManager]: * Use constant arrays=true [2021-01-06 10:01:07,093 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-01-06 10:01:07,094 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-01-06 10:01:07,094 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-01-06 10:01:07,094 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-01-06 10:01:07,095 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 10:01:07,095 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-01-06 10:01:07,095 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-01-06 10:01:07,096 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-01-06 10:01:07,096 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-01-06 10:01:07,096 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-01-06 10:01:07,097 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-01-06 10:01:07,097 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-01-06 10:01:07,097 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-01-06 10:01:07,493 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-01-06 10:01:07,521 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-01-06 10:01:07,525 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-01-06 10:01:07,526 INFO L271 PluginConnector]: Initializing CDTParser... [2021-01-06 10:01:07,527 INFO L275 PluginConnector]: CDTParser initialized [2021-01-06 10:01:07,528 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_strcpy_ground-1.i [2021-01-06 10:01:07,613 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/dcb70fe91/9da1b9ff88964c1586d62886d3486c0f/FLAG74305faa6 [2021-01-06 10:01:08,220 INFO L306 CDTParser]: Found 1 translation units. [2021-01-06 10:01:08,221 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/standard_strcpy_ground-1.i [2021-01-06 10:01:08,229 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/dcb70fe91/9da1b9ff88964c1586d62886d3486c0f/FLAG74305faa6 [2021-01-06 10:01:08,604 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/dcb70fe91/9da1b9ff88964c1586d62886d3486c0f [2021-01-06 10:01:08,608 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-01-06 10:01:08,611 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-01-06 10:01:08,614 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-01-06 10:01:08,614 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-01-06 10:01:08,619 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-01-06 10:01:08,620 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 10:01:08" (1/1) ... [2021-01-06 10:01:08,623 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@333f4af2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:08, skipping insertion in model container [2021-01-06 10:01:08,624 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 10:01:08" (1/1) ... [2021-01-06 10:01:08,638 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-01-06 10:01:08,661 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-01-06 10:01:08,904 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/array-examples/standard_strcpy_ground-1.i[853,866] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~src~0,],[IdentifierExpression[~j~0,]]] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~dst~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~x~0,] [2021-01-06 10:01:08,934 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 10:01:08,943 INFO L203 MainTranslator]: Completed pre-run [2021-01-06 10:01:08,961 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/array-examples/standard_strcpy_ground-1.i[853,866] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#src~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#src~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],IdentifierExpression[~j~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#dst~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#dst~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[~x~0,] [2021-01-06 10:01:08,984 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 10:01:09,008 INFO L208 MainTranslator]: Completed translation [2021-01-06 10:01:09,009 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:09 WrapperNode [2021-01-06 10:01:09,009 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-01-06 10:01:09,011 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-01-06 10:01:09,012 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-01-06 10:01:09,013 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-01-06 10:01:09,022 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:09" (1/1) ... [2021-01-06 10:01:09,032 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:09" (1/1) ... [2021-01-06 10:01:09,062 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-01-06 10:01:09,064 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-01-06 10:01:09,065 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-01-06 10:01:09,066 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-01-06 10:01:09,079 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:09" (1/1) ... [2021-01-06 10:01:09,079 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:09" (1/1) ... [2021-01-06 10:01:09,092 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:09" (1/1) ... [2021-01-06 10:01:09,093 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:09" (1/1) ... [2021-01-06 10:01:09,109 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:09" (1/1) ... [2021-01-06 10:01:09,119 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:09" (1/1) ... [2021-01-06 10:01:09,122 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:09" (1/1) ... [2021-01-06 10:01:09,131 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-01-06 10:01:09,132 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-01-06 10:01:09,132 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-01-06 10:01:09,132 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-01-06 10:01:09,135 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:09" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 10:01:09,249 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-01-06 10:01:09,250 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-01-06 10:01:09,250 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-01-06 10:01:09,250 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-01-06 10:01:09,250 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-01-06 10:01:09,250 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-01-06 10:01:09,250 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-01-06 10:01:09,628 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-01-06 10:01:09,629 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2021-01-06 10:01:09,634 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 10:01:09 BoogieIcfgContainer [2021-01-06 10:01:09,634 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-01-06 10:01:09,639 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-01-06 10:01:09,640 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-01-06 10:01:09,658 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-01-06 10:01:09,660 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.01 10:01:08" (1/3) ... [2021-01-06 10:01:09,661 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@547a80c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 10:01:09, skipping insertion in model container [2021-01-06 10:01:09,662 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:09" (2/3) ... [2021-01-06 10:01:09,662 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@547a80c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 10:01:09, skipping insertion in model container [2021-01-06 10:01:09,662 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 10:01:09" (3/3) ... [2021-01-06 10:01:09,664 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_strcpy_ground-1.i [2021-01-06 10:01:09,683 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-01-06 10:01:09,691 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-01-06 10:01:09,743 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-01-06 10:01:09,807 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-01-06 10:01:09,808 INFO L378 AbstractCegarLoop]: Hoare is true [2021-01-06 10:01:09,811 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-01-06 10:01:09,811 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-01-06 10:01:09,812 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-01-06 10:01:09,812 INFO L382 AbstractCegarLoop]: Difference is false [2021-01-06 10:01:09,812 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-01-06 10:01:09,812 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-01-06 10:01:09,832 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2021-01-06 10:01:09,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-01-06 10:01:09,838 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:09,839 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:09,840 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:09,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:09,848 INFO L82 PathProgramCache]: Analyzing trace with hash 254868323, now seen corresponding path program 1 times [2021-01-06 10:01:09,860 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:09,861 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1696027608] [2021-01-06 10:01:09,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:09,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:10,031 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 10:01:10,032 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1696027608] [2021-01-06 10:01:10,033 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 10:01:10,033 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-01-06 10:01:10,034 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064265941] [2021-01-06 10:01:10,038 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2021-01-06 10:01:10,039 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:10,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-01-06 10:01:10,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-01-06 10:01:10,059 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 2 states. [2021-01-06 10:01:10,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:10,078 INFO L93 Difference]: Finished difference Result 31 states and 43 transitions. [2021-01-06 10:01:10,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-01-06 10:01:10,080 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 8 [2021-01-06 10:01:10,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:10,090 INFO L225 Difference]: With dead ends: 31 [2021-01-06 10:01:10,090 INFO L226 Difference]: Without dead ends: 13 [2021-01-06 10:01:10,093 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-01-06 10:01:10,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-01-06 10:01:10,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-01-06 10:01:10,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2021-01-06 10:01:10,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2021-01-06 10:01:10,134 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 8 [2021-01-06 10:01:10,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:10,134 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2021-01-06 10:01:10,135 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2021-01-06 10:01:10,135 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2021-01-06 10:01:10,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-01-06 10:01:10,135 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:10,136 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:10,136 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-01-06 10:01:10,136 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:10,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:10,137 INFO L82 PathProgramCache]: Analyzing trace with hash 1105866364, now seen corresponding path program 1 times [2021-01-06 10:01:10,138 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:10,138 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1323657380] [2021-01-06 10:01:10,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:10,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:10,252 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 10:01:10,253 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1323657380] [2021-01-06 10:01:10,253 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 10:01:10,254 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-01-06 10:01:10,254 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079821545] [2021-01-06 10:01:10,255 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-01-06 10:01:10,256 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:10,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-01-06 10:01:10,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 10:01:10,258 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand 3 states. [2021-01-06 10:01:10,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:10,276 INFO L93 Difference]: Finished difference Result 24 states and 30 transitions. [2021-01-06 10:01:10,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-01-06 10:01:10,279 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2021-01-06 10:01:10,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:10,280 INFO L225 Difference]: With dead ends: 24 [2021-01-06 10:01:10,281 INFO L226 Difference]: Without dead ends: 14 [2021-01-06 10:01:10,282 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 [2021-01-06 10:01:10,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-01-06 10:01:10,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-01-06 10:01:10,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2021-01-06 10:01:10,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2021-01-06 10:01:10,287 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 10 [2021-01-06 10:01:10,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:10,287 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2021-01-06 10:01:10,287 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-01-06 10:01:10,287 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2021-01-06 10:01:10,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-01-06 10:01:10,288 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:10,288 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:10,288 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-01-06 10:01:10,289 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:10,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:10,290 INFO L82 PathProgramCache]: Analyzing trace with hash -743314847, now seen corresponding path program 1 times [2021-01-06 10:01:10,290 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:10,290 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1995391153] [2021-01-06 10:01:10,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:10,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:10,361 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 10:01:10,362 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1995391153] [2021-01-06 10:01:10,362 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1425690960] [2021-01-06 10:01:10,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:10,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:10,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 3 conjunts are in the unsatisfiable core [2021-01-06 10:01:10,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:10,545 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 10:01:10,545 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:10,546 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-01-06 10:01:10,546 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947707946] [2021-01-06 10:01:10,547 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-01-06 10:01:10,547 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:10,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-01-06 10:01:10,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-01-06 10:01:10,548 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand 5 states. [2021-01-06 10:01:10,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:10,571 INFO L93 Difference]: Finished difference Result 25 states and 31 transitions. [2021-01-06 10:01:10,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-01-06 10:01:10,572 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2021-01-06 10:01:10,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:10,573 INFO L225 Difference]: With dead ends: 25 [2021-01-06 10:01:10,573 INFO L226 Difference]: Without dead ends: 15 [2021-01-06 10:01:10,574 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-01-06 10:01:10,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-01-06 10:01:10,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-01-06 10:01:10,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2021-01-06 10:01:10,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2021-01-06 10:01:10,578 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 11 [2021-01-06 10:01:10,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:10,579 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2021-01-06 10:01:10,579 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-01-06 10:01:10,579 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2021-01-06 10:01:10,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-01-06 10:01:10,580 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:10,580 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:10,793 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-01-06 10:01:10,794 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:10,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:10,794 INFO L82 PathProgramCache]: Analyzing trace with hash 2061609756, now seen corresponding path program 2 times [2021-01-06 10:01:10,795 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:10,795 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823311948] [2021-01-06 10:01:10,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:10,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:10,868 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-01-06 10:01:10,868 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823311948] [2021-01-06 10:01:10,869 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 10:01:10,869 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-01-06 10:01:10,869 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172665383] [2021-01-06 10:01:10,870 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-01-06 10:01:10,870 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:10,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-01-06 10:01:10,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-01-06 10:01:10,871 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand 4 states. [2021-01-06 10:01:10,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:10,914 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2021-01-06 10:01:10,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-01-06 10:01:10,915 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2021-01-06 10:01:10,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:10,916 INFO L225 Difference]: With dead ends: 26 [2021-01-06 10:01:10,916 INFO L226 Difference]: Without dead ends: 18 [2021-01-06 10:01:10,917 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-01-06 10:01:10,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-01-06 10:01:10,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-01-06 10:01:10,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2021-01-06 10:01:10,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2021-01-06 10:01:10,922 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 12 [2021-01-06 10:01:10,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:10,922 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2021-01-06 10:01:10,922 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2021-01-06 10:01:10,922 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2021-01-06 10:01:10,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-01-06 10:01:10,923 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:10,923 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:10,923 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-01-06 10:01:10,924 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:10,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:10,925 INFO L82 PathProgramCache]: Analyzing trace with hash 1853246190, now seen corresponding path program 1 times [2021-01-06 10:01:10,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:10,925 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2043622966] [2021-01-06 10:01:10,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:10,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:10,988 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-01-06 10:01:10,989 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2043622966] [2021-01-06 10:01:10,989 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2046425639] [2021-01-06 10:01:10,989 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 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:11,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:11,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 4 conjunts are in the unsatisfiable core [2021-01-06 10:01:11,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:11,081 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-01-06 10:01:11,081 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:11,082 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-01-06 10:01:11,082 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178007252] [2021-01-06 10:01:11,083 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-01-06 10:01:11,083 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:11,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-01-06 10:01:11,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-01-06 10:01:11,084 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand 6 states. [2021-01-06 10:01:11,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:11,102 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2021-01-06 10:01:11,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-01-06 10:01:11,103 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2021-01-06 10:01:11,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:11,103 INFO L225 Difference]: With dead ends: 32 [2021-01-06 10:01:11,103 INFO L226 Difference]: Without dead ends: 19 [2021-01-06 10:01:11,104 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-01-06 10:01:11,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-01-06 10:01:11,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-01-06 10:01:11,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2021-01-06 10:01:11,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2021-01-06 10:01:11,109 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 15 [2021-01-06 10:01:11,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:11,110 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2021-01-06 10:01:11,110 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-01-06 10:01:11,110 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2021-01-06 10:01:11,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-01-06 10:01:11,111 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:11,111 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:11,324 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:11,325 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:11,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:11,327 INFO L82 PathProgramCache]: Analyzing trace with hash -2112801239, now seen corresponding path program 2 times [2021-01-06 10:01:11,327 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:11,328 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1968538218] [2021-01-06 10:01:11,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:11,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:11,464 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-01-06 10:01:11,465 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1968538218] [2021-01-06 10:01:11,466 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1390251485] [2021-01-06 10:01:11,466 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 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:11,555 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 10:01:11,555 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:11,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 5 conjunts are in the unsatisfiable core [2021-01-06 10:01:11,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:11,644 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-01-06 10:01:11,645 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:11,645 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2021-01-06 10:01:11,646 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103433654] [2021-01-06 10:01:11,646 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-01-06 10:01:11,646 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:11,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-01-06 10:01:11,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-01-06 10:01:11,650 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand 7 states. [2021-01-06 10:01:11,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:11,682 INFO L93 Difference]: Finished difference Result 33 states and 41 transitions. [2021-01-06 10:01:11,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-01-06 10:01:11,683 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2021-01-06 10:01:11,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:11,684 INFO L225 Difference]: With dead ends: 33 [2021-01-06 10:01:11,684 INFO L226 Difference]: Without dead ends: 20 [2021-01-06 10:01:11,691 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-01-06 10:01:11,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-01-06 10:01:11,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-01-06 10:01:11,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2021-01-06 10:01:11,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-01-06 10:01:11,716 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 16 [2021-01-06 10:01:11,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:11,717 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-01-06 10:01:11,717 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2021-01-06 10:01:11,717 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-01-06 10:01:11,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-01-06 10:01:11,720 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:11,720 INFO L422 BasicCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:11,921 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:11,922 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:11,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:11,923 INFO L82 PathProgramCache]: Analyzing trace with hash -506219954, now seen corresponding path program 3 times [2021-01-06 10:01:11,923 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:11,924 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1353042060] [2021-01-06 10:01:11,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:11,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:12,041 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-01-06 10:01:12,044 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1353042060] [2021-01-06 10:01:12,044 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1196525554] [2021-01-06 10:01:12,044 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 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:12,120 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-01-06 10:01:12,120 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:12,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 19 conjunts are in the unsatisfiable core [2021-01-06 10:01:12,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:12,208 INFO L348 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-01-06 10:01:12,209 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 15 [2021-01-06 10:01:12,211 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:01:12,217 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:01:12,218 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-01-06 10:01:12,219 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:22, output treesize:18 [2021-01-06 10:01:12,290 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-01-06 10:01:12,291 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:12,291 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 11 [2021-01-06 10:01:12,291 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280635160] [2021-01-06 10:01:12,292 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-01-06 10:01:12,292 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:12,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-01-06 10:01:12,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-01-06 10:01:12,293 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand 11 states. [2021-01-06 10:01:12,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:12,473 INFO L93 Difference]: Finished difference Result 39 states and 48 transitions. [2021-01-06 10:01:12,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-01-06 10:01:12,473 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 17 [2021-01-06 10:01:12,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:12,474 INFO L225 Difference]: With dead ends: 39 [2021-01-06 10:01:12,474 INFO L226 Difference]: Without dead ends: 26 [2021-01-06 10:01:12,475 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=226, Unknown=0, NotChecked=0, Total=306 [2021-01-06 10:01:12,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-01-06 10:01:12,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 23. [2021-01-06 10:01:12,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2021-01-06 10:01:12,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-01-06 10:01:12,480 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 17 [2021-01-06 10:01:12,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:12,480 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-01-06 10:01:12,480 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2021-01-06 10:01:12,480 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-01-06 10:01:12,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-01-06 10:01:12,481 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:12,481 INFO L422 BasicCegarLoop]: trace histogram [5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:12,695 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:12,696 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:12,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:12,697 INFO L82 PathProgramCache]: Analyzing trace with hash -1687448065, now seen corresponding path program 1 times [2021-01-06 10:01:12,697 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:12,698 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1455710518] [2021-01-06 10:01:12,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:12,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:12,767 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-01-06 10:01:12,767 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1455710518] [2021-01-06 10:01:12,768 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1135789230] [2021-01-06 10:01:12,768 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 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:12,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:12,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 7 conjunts are in the unsatisfiable core [2021-01-06 10:01:12,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:12,873 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-01-06 10:01:12,874 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:12,874 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-01-06 10:01:12,874 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433860516] [2021-01-06 10:01:12,875 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-01-06 10:01:12,875 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:12,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-01-06 10:01:12,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-01-06 10:01:12,876 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 9 states. [2021-01-06 10:01:12,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:12,917 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2021-01-06 10:01:12,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-01-06 10:01:12,918 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2021-01-06 10:01:12,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:12,919 INFO L225 Difference]: With dead ends: 39 [2021-01-06 10:01:12,919 INFO L226 Difference]: Without dead ends: 24 [2021-01-06 10:01:12,920 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-01-06 10:01:12,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-01-06 10:01:12,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-01-06 10:01:12,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2021-01-06 10:01:12,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-01-06 10:01:12,925 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 22 [2021-01-06 10:01:12,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:12,925 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-01-06 10:01:12,925 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-01-06 10:01:12,925 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-01-06 10:01:12,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-01-06 10:01:12,926 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:12,926 INFO L422 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:13,139 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:13,140 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:13,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:13,141 INFO L82 PathProgramCache]: Analyzing trace with hash -878206364, now seen corresponding path program 2 times [2021-01-06 10:01:13,142 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:13,142 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570740855] [2021-01-06 10:01:13,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:13,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:13,225 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-01-06 10:01:13,226 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570740855] [2021-01-06 10:01:13,226 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2137314958] [2021-01-06 10:01:13,227 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:13,305 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 10:01:13,305 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:13,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 8 conjunts are in the unsatisfiable core [2021-01-06 10:01:13,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:13,382 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-01-06 10:01:13,382 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:13,382 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2021-01-06 10:01:13,383 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146554203] [2021-01-06 10:01:13,383 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-01-06 10:01:13,383 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:13,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-01-06 10:01:13,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2021-01-06 10:01:13,384 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand 10 states. [2021-01-06 10:01:13,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:13,414 INFO L93 Difference]: Finished difference Result 40 states and 48 transitions. [2021-01-06 10:01:13,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-01-06 10:01:13,415 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 23 [2021-01-06 10:01:13,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:13,416 INFO L225 Difference]: With dead ends: 40 [2021-01-06 10:01:13,416 INFO L226 Difference]: Without dead ends: 25 [2021-01-06 10:01:13,418 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2021-01-06 10:01:13,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-01-06 10:01:13,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-01-06 10:01:13,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2021-01-06 10:01:13,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2021-01-06 10:01:13,425 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 23 [2021-01-06 10:01:13,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:13,425 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2021-01-06 10:01:13,425 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2021-01-06 10:01:13,425 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2021-01-06 10:01:13,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-01-06 10:01:13,426 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:13,426 INFO L422 BasicCegarLoop]: trace histogram [7, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:13,639 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:13,640 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:13,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:13,641 INFO L82 PathProgramCache]: Analyzing trace with hash -1561517409, now seen corresponding path program 3 times [2021-01-06 10:01:13,641 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:13,642 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076135555] [2021-01-06 10:01:13,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:13,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:13,722 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-01-06 10:01:13,722 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076135555] [2021-01-06 10:01:13,723 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2067339667] [2021-01-06 10:01:13,723 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:13,781 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-01-06 10:01:13,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:13,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 5 conjunts are in the unsatisfiable core [2021-01-06 10:01:13,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:13,872 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-01-06 10:01:13,873 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:13,873 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6] total 14 [2021-01-06 10:01:13,873 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115833952] [2021-01-06 10:01:13,874 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-01-06 10:01:13,874 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:13,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-01-06 10:01:13,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=125, Unknown=0, NotChecked=0, Total=182 [2021-01-06 10:01:13,875 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 14 states. [2021-01-06 10:01:14,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:14,028 INFO L93 Difference]: Finished difference Result 50 states and 60 transitions. [2021-01-06 10:01:14,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-01-06 10:01:14,028 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 24 [2021-01-06 10:01:14,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:14,029 INFO L225 Difference]: With dead ends: 50 [2021-01-06 10:01:14,029 INFO L226 Difference]: Without dead ends: 29 [2021-01-06 10:01:14,030 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=309, Unknown=0, NotChecked=0, Total=462 [2021-01-06 10:01:14,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-01-06 10:01:14,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-01-06 10:01:14,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2021-01-06 10:01:14,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions. [2021-01-06 10:01:14,035 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 24 [2021-01-06 10:01:14,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:14,035 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 34 transitions. [2021-01-06 10:01:14,035 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2021-01-06 10:01:14,035 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions. [2021-01-06 10:01:14,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-01-06 10:01:14,036 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:14,036 INFO L422 BasicCegarLoop]: trace histogram [8, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:14,249 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-01-06 10:01:14,250 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:14,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:14,251 INFO L82 PathProgramCache]: Analyzing trace with hash 1832946034, now seen corresponding path program 4 times [2021-01-06 10:01:14,252 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:14,252 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [244884381] [2021-01-06 10:01:14,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:14,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:14,427 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-01-06 10:01:14,430 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [244884381] [2021-01-06 10:01:14,431 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [779995941] [2021-01-06 10:01:14,431 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:14,503 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 10:01:14,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:14,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 10 conjunts are in the unsatisfiable core [2021-01-06 10:01:14,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:14,586 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-01-06 10:01:14,586 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:14,586 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-01-06 10:01:14,588 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611499219] [2021-01-06 10:01:14,589 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-01-06 10:01:14,589 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:14,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-01-06 10:01:14,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2021-01-06 10:01:14,590 INFO L87 Difference]: Start difference. First operand 29 states and 34 transitions. Second operand 12 states. [2021-01-06 10:01:14,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:14,620 INFO L93 Difference]: Finished difference Result 48 states and 58 transitions. [2021-01-06 10:01:14,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-01-06 10:01:14,621 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2021-01-06 10:01:14,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:14,624 INFO L225 Difference]: With dead ends: 48 [2021-01-06 10:01:14,625 INFO L226 Difference]: Without dead ends: 30 [2021-01-06 10:01:14,626 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2021-01-06 10:01:14,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-01-06 10:01:14,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-01-06 10:01:14,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2021-01-06 10:01:14,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2021-01-06 10:01:14,636 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 28 [2021-01-06 10:01:14,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:14,636 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2021-01-06 10:01:14,636 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2021-01-06 10:01:14,637 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2021-01-06 10:01:14,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-01-06 10:01:14,637 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:14,637 INFO L422 BasicCegarLoop]: trace histogram [9, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:14,841 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-01-06 10:01:14,842 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:14,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:14,843 INFO L82 PathProgramCache]: Analyzing trace with hash 706278935, now seen corresponding path program 5 times [2021-01-06 10:01:14,843 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:14,843 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [360808007] [2021-01-06 10:01:14,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:14,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:14,990 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-01-06 10:01:14,990 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [360808007] [2021-01-06 10:01:14,990 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [284099645] [2021-01-06 10:01:14,991 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:15,108 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-01-06 10:01:15,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:15,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 11 conjunts are in the unsatisfiable core [2021-01-06 10:01:15,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:15,158 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-01-06 10:01:15,159 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:15,159 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2021-01-06 10:01:15,159 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003752659] [2021-01-06 10:01:15,160 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-01-06 10:01:15,160 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:15,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-01-06 10:01:15,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2021-01-06 10:01:15,161 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 13 states. [2021-01-06 10:01:15,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:15,186 INFO L93 Difference]: Finished difference Result 49 states and 59 transitions. [2021-01-06 10:01:15,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-01-06 10:01:15,186 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 29 [2021-01-06 10:01:15,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:15,187 INFO L225 Difference]: With dead ends: 49 [2021-01-06 10:01:15,187 INFO L226 Difference]: Without dead ends: 31 [2021-01-06 10:01:15,188 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2021-01-06 10:01:15,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-01-06 10:01:15,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-01-06 10:01:15,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2021-01-06 10:01:15,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2021-01-06 10:01:15,193 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 29 [2021-01-06 10:01:15,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:15,193 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2021-01-06 10:01:15,193 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2021-01-06 10:01:15,193 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2021-01-06 10:01:15,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-01-06 10:01:15,194 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:15,194 INFO L422 BasicCegarLoop]: trace histogram [10, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:15,405 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:15,406 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:15,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:15,407 INFO L82 PathProgramCache]: Analyzing trace with hash 139337234, now seen corresponding path program 6 times [2021-01-06 10:01:15,407 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:15,408 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1494054133] [2021-01-06 10:01:15,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:15,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:15,538 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-01-06 10:01:15,539 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1494054133] [2021-01-06 10:01:15,539 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [326296529] [2021-01-06 10:01:15,539 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:15,662 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-01-06 10:01:15,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:15,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 29 conjunts are in the unsatisfiable core [2021-01-06 10:01:15,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:15,698 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-01-06 10:01:15,701 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:01:15,705 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:01:15,706 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-01-06 10:01:15,706 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:12, output treesize:8 [2021-01-06 10:01:15,775 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 19 [2021-01-06 10:01:15,777 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:01:15,783 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:01:15,784 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-01-06 10:01:15,785 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:23 [2021-01-06 10:01:15,951 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-01-06 10:01:15,951 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:15,951 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 20 [2021-01-06 10:01:15,951 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854364480] [2021-01-06 10:01:15,952 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-01-06 10:01:15,952 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:15,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-01-06 10:01:15,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=284, Unknown=0, NotChecked=0, Total=380 [2021-01-06 10:01:15,953 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand 20 states. [2021-01-06 10:01:16,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:16,552 INFO L93 Difference]: Finished difference Result 69 states and 82 transitions. [2021-01-06 10:01:16,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-01-06 10:01:16,553 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 30 [2021-01-06 10:01:16,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:16,553 INFO L225 Difference]: With dead ends: 69 [2021-01-06 10:01:16,553 INFO L226 Difference]: Without dead ends: 51 [2021-01-06 10:01:16,554 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=267, Invalid=855, Unknown=0, NotChecked=0, Total=1122 [2021-01-06 10:01:16,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-01-06 10:01:16,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 40. [2021-01-06 10:01:16,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2021-01-06 10:01:16,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 47 transitions. [2021-01-06 10:01:16,564 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 47 transitions. Word has length 30 [2021-01-06 10:01:16,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:16,564 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 47 transitions. [2021-01-06 10:01:16,564 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2021-01-06 10:01:16,564 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 47 transitions. [2021-01-06 10:01:16,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-01-06 10:01:16,565 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:16,566 INFO L422 BasicCegarLoop]: trace histogram [11, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:16,780 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:16,781 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:16,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:16,783 INFO L82 PathProgramCache]: Analyzing trace with hash 830717151, now seen corresponding path program 7 times [2021-01-06 10:01:16,783 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:16,783 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [494012069] [2021-01-06 10:01:16,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:16,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:16,955 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-01-06 10:01:16,955 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [494012069] [2021-01-06 10:01:16,957 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [775680509] [2021-01-06 10:01:16,957 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:17,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:17,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 13 conjunts are in the unsatisfiable core [2021-01-06 10:01:17,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:17,114 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-01-06 10:01:17,114 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:17,115 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2021-01-06 10:01:17,115 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249149295] [2021-01-06 10:01:17,115 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-01-06 10:01:17,115 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:17,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-01-06 10:01:17,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2021-01-06 10:01:17,116 INFO L87 Difference]: Start difference. First operand 40 states and 47 transitions. Second operand 15 states. [2021-01-06 10:01:17,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:17,143 INFO L93 Difference]: Finished difference Result 67 states and 81 transitions. [2021-01-06 10:01:17,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-01-06 10:01:17,143 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 34 [2021-01-06 10:01:17,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:17,144 INFO L225 Difference]: With dead ends: 67 [2021-01-06 10:01:17,144 INFO L226 Difference]: Without dead ends: 41 [2021-01-06 10:01:17,145 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2021-01-06 10:01:17,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-01-06 10:01:17,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-01-06 10:01:17,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2021-01-06 10:01:17,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 48 transitions. [2021-01-06 10:01:17,158 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 48 transitions. Word has length 34 [2021-01-06 10:01:17,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:17,159 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 48 transitions. [2021-01-06 10:01:17,159 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2021-01-06 10:01:17,159 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 48 transitions. [2021-01-06 10:01:17,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-01-06 10:01:17,160 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:17,160 INFO L422 BasicCegarLoop]: trace histogram [12, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:17,373 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-01-06 10:01:17,374 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:17,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:17,375 INFO L82 PathProgramCache]: Analyzing trace with hash 633297348, now seen corresponding path program 8 times [2021-01-06 10:01:17,375 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:17,376 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1535138245] [2021-01-06 10:01:17,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:17,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:17,532 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-01-06 10:01:17,532 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1535138245] [2021-01-06 10:01:17,532 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568189834] [2021-01-06 10:01:17,532 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:17,604 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 10:01:17,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:17,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 14 conjunts are in the unsatisfiable core [2021-01-06 10:01:17,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:17,696 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-01-06 10:01:17,697 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:17,697 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2021-01-06 10:01:17,697 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1717373897] [2021-01-06 10:01:17,698 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-01-06 10:01:17,698 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:17,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-01-06 10:01:17,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2021-01-06 10:01:17,699 INFO L87 Difference]: Start difference. First operand 41 states and 48 transitions. Second operand 16 states. [2021-01-06 10:01:17,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:17,729 INFO L93 Difference]: Finished difference Result 68 states and 82 transitions. [2021-01-06 10:01:17,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-01-06 10:01:17,730 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 35 [2021-01-06 10:01:17,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:17,730 INFO L225 Difference]: With dead ends: 68 [2021-01-06 10:01:17,731 INFO L226 Difference]: Without dead ends: 42 [2021-01-06 10:01:17,731 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2021-01-06 10:01:17,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-01-06 10:01:17,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-01-06 10:01:17,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2021-01-06 10:01:17,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2021-01-06 10:01:17,737 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 35 [2021-01-06 10:01:17,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:17,738 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2021-01-06 10:01:17,738 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2021-01-06 10:01:17,738 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2021-01-06 10:01:17,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-01-06 10:01:17,739 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:17,739 INFO L422 BasicCegarLoop]: trace histogram [13, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:17,954 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-01-06 10:01:17,955 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:17,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:17,956 INFO L82 PathProgramCache]: Analyzing trace with hash -1191749249, now seen corresponding path program 9 times [2021-01-06 10:01:17,956 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:17,957 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [261527531] [2021-01-06 10:01:17,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:17,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:18,171 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-01-06 10:01:18,172 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [261527531] [2021-01-06 10:01:18,172 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1730806525] [2021-01-06 10:01:18,173 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:18,263 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-01-06 10:01:18,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:18,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 43 conjunts are in the unsatisfiable core [2021-01-06 10:01:18,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:18,279 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-01-06 10:01:18,281 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:01:18,290 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:01:18,291 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-01-06 10:01:18,291 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:17 [2021-01-06 10:01:18,366 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 15 [2021-01-06 10:01:18,368 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:01:18,381 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:01:18,382 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-01-06 10:01:18,382 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:29, output treesize:25 [2021-01-06 10:01:18,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-01-06 10:01:18,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-01-06 10:01:18,428 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 36 [2021-01-06 10:01:18,430 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:01:18,446 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:01:18,447 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-01-06 10:01:18,448 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:44, output treesize:40 [2021-01-06 10:01:18,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-01-06 10:01:18,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-01-06 10:01:18,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-01-06 10:01:18,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-01-06 10:01:18,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-01-06 10:01:18,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-01-06 10:01:18,506 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 50 treesize of output 61 [2021-01-06 10:01:18,509 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:01:18,527 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:01:18,531 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-01-06 10:01:18,532 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:68, output treesize:64 [2021-01-06 10:01:21,238 WARN L197 SmtUtils]: Spent 2.05 s on a formula simplification that was a NOOP. DAG size: 37 [2021-01-06 10:01:23,393 WARN L197 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 39 [2021-01-06 10:01:26,336 WARN L197 SmtUtils]: Spent 2.86 s on a formula simplification. DAG size of input: 51 DAG size of output: 41 [2021-01-06 10:01:28,345 WARN L197 SmtUtils]: Spent 1.93 s on a formula simplification that was a NOOP. DAG size: 39 [2021-01-06 10:01:28,412 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-01-06 10:01:28,413 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:28,413 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 11] total 25 [2021-01-06 10:01:28,413 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237424583] [2021-01-06 10:01:28,414 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-01-06 10:01:28,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:28,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-01-06 10:01:28,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2021-01-06 10:01:28,415 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand 25 states. [2021-01-06 10:01:35,040 WARN L197 SmtUtils]: Spent 2.03 s on a formula simplification that was a NOOP. DAG size: 38 [2021-01-06 10:01:37,053 WARN L197 SmtUtils]: Spent 917.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-01-06 10:01:38,461 WARN L197 SmtUtils]: Spent 1.34 s on a formula simplification that was a NOOP. DAG size: 42 [2021-01-06 10:01:40,547 WARN L197 SmtUtils]: Spent 2.03 s on a formula simplification that was a NOOP. DAG size: 42 [2021-01-06 10:01:41,563 WARN L197 SmtUtils]: Spent 927.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-01-06 10:01:41,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:41,580 INFO L93 Difference]: Finished difference Result 84 states and 99 transitions. [2021-01-06 10:01:41,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-01-06 10:01:41,581 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 36 [2021-01-06 10:01:41,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:41,582 INFO L225 Difference]: With dead ends: 84 [2021-01-06 10:01:41,582 INFO L226 Difference]: Without dead ends: 58 [2021-01-06 10:01:41,583 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 357 ImplicationChecksByTransitivity, 17.7s TimeCoverageRelationStatistics Valid=413, Invalid=1393, Unknown=0, NotChecked=0, Total=1806 [2021-01-06 10:01:41,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-01-06 10:01:41,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 39. [2021-01-06 10:01:41,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2021-01-06 10:01:41,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2021-01-06 10:01:41,590 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 36 [2021-01-06 10:01:41,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:41,590 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2021-01-06 10:01:41,590 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2021-01-06 10:01:41,590 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2021-01-06 10:01:41,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-01-06 10:01:41,591 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:41,591 INFO L422 BasicCegarLoop]: trace histogram [14, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:41,792 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-01-06 10:01:41,792 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:41,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:41,793 INFO L82 PathProgramCache]: Analyzing trace with hash -496583160, now seen corresponding path program 10 times [2021-01-06 10:01:41,794 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:41,794 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [352476877] [2021-01-06 10:01:41,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:41,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:42,037 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-01-06 10:01:42,038 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [352476877] [2021-01-06 10:01:42,038 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [851877566] [2021-01-06 10:01:42,038 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:42,116 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 10:01:42,117 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:42,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 7 conjunts are in the unsatisfiable core [2021-01-06 10:01:42,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:42,261 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 8 proven. 9 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-01-06 10:01:42,261 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:42,261 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 8] total 23 [2021-01-06 10:01:42,261 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132999802] [2021-01-06 10:01:42,262 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-01-06 10:01:42,262 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:42,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-01-06 10:01:42,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=349, Unknown=0, NotChecked=0, Total=506 [2021-01-06 10:01:42,263 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand 23 states. [2021-01-06 10:01:42,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:42,694 INFO L93 Difference]: Finished difference Result 75 states and 87 transitions. [2021-01-06 10:01:42,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-01-06 10:01:42,695 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 38 [2021-01-06 10:01:42,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:42,696 INFO L225 Difference]: With dead ends: 75 [2021-01-06 10:01:42,696 INFO L226 Difference]: Without dead ends: 43 [2021-01-06 10:01:42,697 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=457, Invalid=949, Unknown=0, NotChecked=0, Total=1406 [2021-01-06 10:01:42,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-01-06 10:01:42,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-01-06 10:01:42,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2021-01-06 10:01:42,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2021-01-06 10:01:42,703 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 38 [2021-01-06 10:01:42,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:42,703 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2021-01-06 10:01:42,703 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2021-01-06 10:01:42,703 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2021-01-06 10:01:42,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-01-06 10:01:42,704 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:42,704 INFO L422 BasicCegarLoop]: trace histogram [15, 4, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:42,918 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:42,919 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:42,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:42,920 INFO L82 PathProgramCache]: Analyzing trace with hash -1665429931, now seen corresponding path program 11 times [2021-01-06 10:01:42,920 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:42,920 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [391732406] [2021-01-06 10:01:42,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:42,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:43,172 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-01-06 10:01:43,172 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [391732406] [2021-01-06 10:01:43,172 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [620337669] [2021-01-06 10:01:43,173 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:43,461 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2021-01-06 10:01:43,461 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:43,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 17 conjunts are in the unsatisfiable core [2021-01-06 10:01:43,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:43,540 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-01-06 10:01:43,540 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:43,540 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2021-01-06 10:01:43,541 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037887132] [2021-01-06 10:01:43,541 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-01-06 10:01:43,541 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:43,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-01-06 10:01:43,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2021-01-06 10:01:43,542 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand 19 states. [2021-01-06 10:01:43,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:43,576 INFO L93 Difference]: Finished difference Result 69 states and 81 transitions. [2021-01-06 10:01:43,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-01-06 10:01:43,577 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2021-01-06 10:01:43,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:43,577 INFO L225 Difference]: With dead ends: 69 [2021-01-06 10:01:43,578 INFO L226 Difference]: Without dead ends: 44 [2021-01-06 10:01:43,578 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2021-01-06 10:01:43,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-01-06 10:01:43,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-01-06 10:01:43,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2021-01-06 10:01:43,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 50 transitions. [2021-01-06 10:01:43,593 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 50 transitions. Word has length 42 [2021-01-06 10:01:43,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:43,593 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 50 transitions. [2021-01-06 10:01:43,593 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2021-01-06 10:01:43,593 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 50 transitions. [2021-01-06 10:01:43,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-01-06 10:01:43,596 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:43,596 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:43,809 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-01-06 10:01:43,810 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:43,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:43,811 INFO L82 PathProgramCache]: Analyzing trace with hash 2060613178, now seen corresponding path program 12 times [2021-01-06 10:01:43,811 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:43,811 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249807340] [2021-01-06 10:01:43,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:43,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:44,072 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-01-06 10:01:44,073 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249807340] [2021-01-06 10:01:44,073 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1297807096] [2021-01-06 10:01:44,073 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 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 [2021-01-06 10:01:44,386 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-01-06 10:01:44,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:44,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 23 conjunts are in the unsatisfiable core [2021-01-06 10:01:44,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:44,403 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-01-06 10:01:44,406 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:01:44,410 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:01:44,411 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-01-06 10:01:44,411 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:12, output treesize:8 [2021-01-06 10:01:44,544 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 23 [2021-01-06 10:01:44,546 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:01:44,556 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:01:44,558 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-01-06 10:01:44,558 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:32 [2021-01-06 10:01:44,821 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2021-01-06 10:01:44,828 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2021-01-06 10:01:44,830 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2021-01-06 10:01:44,835 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2021-01-06 10:01:44,838 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 6 disjuncts [2021-01-06 10:01:44,878 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 6 proven. 20 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-01-06 10:01:44,878 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:44,879 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 10] total 27 [2021-01-06 10:01:44,879 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163101232] [2021-01-06 10:01:44,879 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-01-06 10:01:44,879 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:44,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-01-06 10:01:44,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=506, Unknown=0, NotChecked=0, Total=702 [2021-01-06 10:01:44,881 INFO L87 Difference]: Start difference. First operand 44 states and 50 transitions. Second operand 27 states. [2021-01-06 10:01:45,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:45,736 INFO L93 Difference]: Finished difference Result 87 states and 102 transitions. [2021-01-06 10:01:45,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-01-06 10:01:45,736 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 43 [2021-01-06 10:01:45,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:45,737 INFO L225 Difference]: With dead ends: 87 [2021-01-06 10:01:45,737 INFO L226 Difference]: Without dead ends: 48 [2021-01-06 10:01:45,739 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 386 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=587, Invalid=1575, Unknown=0, NotChecked=0, Total=2162 [2021-01-06 10:01:45,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-01-06 10:01:45,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-01-06 10:01:45,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2021-01-06 10:01:45,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 55 transitions. [2021-01-06 10:01:45,746 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 55 transitions. Word has length 43 [2021-01-06 10:01:45,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:45,747 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 55 transitions. [2021-01-06 10:01:45,747 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2021-01-06 10:01:45,747 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 55 transitions. [2021-01-06 10:01:45,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-01-06 10:01:45,748 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:45,748 INFO L422 BasicCegarLoop]: trace histogram [17, 5, 5, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:45,954 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:45,955 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:45,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:45,956 INFO L82 PathProgramCache]: Analyzing trace with hash -1679296819, now seen corresponding path program 13 times [2021-01-06 10:01:45,956 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:45,956 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264088238] [2021-01-06 10:01:45,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:45,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:46,278 INFO L134 CoverageAnalysis]: Checked inductivity of 191 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-01-06 10:01:46,278 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1264088238] [2021-01-06 10:01:46,278 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [518334] [2021-01-06 10:01:46,279 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 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 [2021-01-06 10:01:46,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:46,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 19 conjunts are in the unsatisfiable core [2021-01-06 10:01:46,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:46,420 INFO L134 CoverageAnalysis]: Checked inductivity of 191 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-01-06 10:01:46,420 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:46,421 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2021-01-06 10:01:46,421 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231624556] [2021-01-06 10:01:46,421 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-01-06 10:01:46,421 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:46,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-01-06 10:01:46,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2021-01-06 10:01:46,422 INFO L87 Difference]: Start difference. First operand 48 states and 55 transitions. Second operand 21 states. [2021-01-06 10:01:46,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:46,454 INFO L93 Difference]: Finished difference Result 77 states and 91 transitions. [2021-01-06 10:01:46,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-01-06 10:01:46,454 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 47 [2021-01-06 10:01:46,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:46,455 INFO L225 Difference]: With dead ends: 77 [2021-01-06 10:01:46,455 INFO L226 Difference]: Without dead ends: 49 [2021-01-06 10:01:46,456 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2021-01-06 10:01:46,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-01-06 10:01:46,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-01-06 10:01:46,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2021-01-06 10:01:46,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 56 transitions. [2021-01-06 10:01:46,461 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 56 transitions. Word has length 47 [2021-01-06 10:01:46,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:46,461 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 56 transitions. [2021-01-06 10:01:46,461 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2021-01-06 10:01:46,461 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 56 transitions. [2021-01-06 10:01:46,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-01-06 10:01:46,462 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:46,462 INFO L422 BasicCegarLoop]: trace histogram [18, 5, 5, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:46,677 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:46,677 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:46,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:46,678 INFO L82 PathProgramCache]: Analyzing trace with hash -774949368, now seen corresponding path program 14 times [2021-01-06 10:01:46,678 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:46,679 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [896928125] [2021-01-06 10:01:46,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:46,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:46,980 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-01-06 10:01:46,980 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [896928125] [2021-01-06 10:01:46,980 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [121359473] [2021-01-06 10:01:46,980 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:47,062 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 10:01:47,063 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:47,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 20 conjunts are in the unsatisfiable core [2021-01-06 10:01:47,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:47,144 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-01-06 10:01:47,144 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:47,144 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2021-01-06 10:01:47,144 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101430966] [2021-01-06 10:01:47,145 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-01-06 10:01:47,145 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:47,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-01-06 10:01:47,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2021-01-06 10:01:47,146 INFO L87 Difference]: Start difference. First operand 49 states and 56 transitions. Second operand 22 states. [2021-01-06 10:01:47,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:47,190 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2021-01-06 10:01:47,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-01-06 10:01:47,194 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 48 [2021-01-06 10:01:47,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:47,195 INFO L225 Difference]: With dead ends: 78 [2021-01-06 10:01:47,195 INFO L226 Difference]: Without dead ends: 50 [2021-01-06 10:01:47,196 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2021-01-06 10:01:47,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-01-06 10:01:47,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-01-06 10:01:47,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2021-01-06 10:01:47,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 57 transitions. [2021-01-06 10:01:47,200 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 57 transitions. Word has length 48 [2021-01-06 10:01:47,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:47,201 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 57 transitions. [2021-01-06 10:01:47,201 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2021-01-06 10:01:47,201 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 57 transitions. [2021-01-06 10:01:47,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-01-06 10:01:47,201 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:47,201 INFO L422 BasicCegarLoop]: trace histogram [19, 5, 5, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:47,416 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-01-06 10:01:47,417 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:47,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:47,418 INFO L82 PathProgramCache]: Analyzing trace with hash 1490017837, now seen corresponding path program 15 times [2021-01-06 10:01:47,418 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:47,418 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [324702976] [2021-01-06 10:01:47,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:47,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:47,765 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-01-06 10:01:47,765 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [324702976] [2021-01-06 10:01:47,765 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [425565729] [2021-01-06 10:01:47,766 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:48,034 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-01-06 10:01:48,034 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:48,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 31 conjunts are in the unsatisfiable core [2021-01-06 10:01:48,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:48,047 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-01-06 10:01:48,049 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:01:48,053 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:01:48,053 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-01-06 10:01:48,053 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:12, output treesize:8 [2021-01-06 10:01:48,159 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 19 [2021-01-06 10:01:48,160 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:01:48,167 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:01:48,168 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-01-06 10:01:48,168 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:23 [2021-01-06 10:01:48,238 INFO L348 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:01:48,238 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 39 treesize of output 88 [2021-01-06 10:01:48,241 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:01:48,267 INFO L625 ElimStorePlain]: treesize reduction 54, result has 43.8 percent of original size [2021-01-06 10:01:48,268 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-01-06 10:01:48,269 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:46, output treesize:42 [2021-01-06 10:01:48,694 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-01-06 10:01:48,694 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:48,694 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 12] total 32 [2021-01-06 10:01:48,695 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009194610] [2021-01-06 10:01:48,695 INFO L461 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-01-06 10:01:48,695 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:48,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-01-06 10:01:48,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=256, Invalid=736, Unknown=0, NotChecked=0, Total=992 [2021-01-06 10:01:48,696 INFO L87 Difference]: Start difference. First operand 50 states and 57 transitions. Second operand 32 states. [2021-01-06 10:01:50,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:50,366 INFO L93 Difference]: Finished difference Result 86 states and 101 transitions. [2021-01-06 10:01:50,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-01-06 10:01:50,369 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 49 [2021-01-06 10:01:50,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:50,369 INFO L225 Difference]: With dead ends: 86 [2021-01-06 10:01:50,369 INFO L226 Difference]: Without dead ends: 58 [2021-01-06 10:01:50,371 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 676 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=781, Invalid=2879, Unknown=0, NotChecked=0, Total=3660 [2021-01-06 10:01:50,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-01-06 10:01:50,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 55. [2021-01-06 10:01:50,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2021-01-06 10:01:50,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 62 transitions. [2021-01-06 10:01:50,376 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 62 transitions. Word has length 49 [2021-01-06 10:01:50,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:50,376 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 62 transitions. [2021-01-06 10:01:50,376 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2021-01-06 10:01:50,376 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 62 transitions. [2021-01-06 10:01:50,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-01-06 10:01:50,377 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:50,377 INFO L422 BasicCegarLoop]: trace histogram [20, 5, 5, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:50,590 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:50,591 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:50,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:50,591 INFO L82 PathProgramCache]: Analyzing trace with hash 1667108446, now seen corresponding path program 16 times [2021-01-06 10:01:50,592 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:50,592 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82268249] [2021-01-06 10:01:50,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:50,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:50,931 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-01-06 10:01:50,931 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82268249] [2021-01-06 10:01:50,931 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1587318667] [2021-01-06 10:01:50,931 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:51,035 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 10:01:51,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:51,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 22 conjunts are in the unsatisfiable core [2021-01-06 10:01:51,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:51,109 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-01-06 10:01:51,109 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:51,109 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2021-01-06 10:01:51,109 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94807532] [2021-01-06 10:01:51,110 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-01-06 10:01:51,110 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:51,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-01-06 10:01:51,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2021-01-06 10:01:51,111 INFO L87 Difference]: Start difference. First operand 55 states and 62 transitions. Second operand 24 states. [2021-01-06 10:01:51,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:51,152 INFO L93 Difference]: Finished difference Result 88 states and 102 transitions. [2021-01-06 10:01:51,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-01-06 10:01:51,153 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 54 [2021-01-06 10:01:51,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:51,153 INFO L225 Difference]: With dead ends: 88 [2021-01-06 10:01:51,153 INFO L226 Difference]: Without dead ends: 56 [2021-01-06 10:01:51,154 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2021-01-06 10:01:51,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-01-06 10:01:51,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-01-06 10:01:51,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2021-01-06 10:01:51,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 63 transitions. [2021-01-06 10:01:51,159 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 63 transitions. Word has length 54 [2021-01-06 10:01:51,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:51,159 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 63 transitions. [2021-01-06 10:01:51,159 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2021-01-06 10:01:51,160 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 63 transitions. [2021-01-06 10:01:51,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-01-06 10:01:51,160 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:51,160 INFO L422 BasicCegarLoop]: trace histogram [21, 5, 5, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:51,370 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-01-06 10:01:51,371 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:51,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:51,372 INFO L82 PathProgramCache]: Analyzing trace with hash 1720141507, now seen corresponding path program 17 times [2021-01-06 10:01:51,372 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:51,372 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1101849216] [2021-01-06 10:01:51,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:51,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:51,781 INFO L134 CoverageAnalysis]: Checked inductivity of 279 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-01-06 10:01:51,781 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1101849216] [2021-01-06 10:01:51,781 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1694360229] [2021-01-06 10:01:51,781 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:53,449 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-01-06 10:01:53,449 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:53,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 23 conjunts are in the unsatisfiable core [2021-01-06 10:01:53,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:53,528 INFO L134 CoverageAnalysis]: Checked inductivity of 279 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-01-06 10:01:53,528 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:53,528 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 25 [2021-01-06 10:01:53,529 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608836417] [2021-01-06 10:01:53,529 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-01-06 10:01:53,529 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:53,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-01-06 10:01:53,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2021-01-06 10:01:53,530 INFO L87 Difference]: Start difference. First operand 56 states and 63 transitions. Second operand 25 states. [2021-01-06 10:01:53,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:53,577 INFO L93 Difference]: Finished difference Result 89 states and 103 transitions. [2021-01-06 10:01:53,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-01-06 10:01:53,578 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 55 [2021-01-06 10:01:53,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:53,578 INFO L225 Difference]: With dead ends: 89 [2021-01-06 10:01:53,578 INFO L226 Difference]: Without dead ends: 57 [2021-01-06 10:01:53,578 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2021-01-06 10:01:53,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-01-06 10:01:53,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-01-06 10:01:53,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2021-01-06 10:01:53,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 64 transitions. [2021-01-06 10:01:53,585 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 64 transitions. Word has length 55 [2021-01-06 10:01:53,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:53,585 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 64 transitions. [2021-01-06 10:01:53,585 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2021-01-06 10:01:53,585 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 64 transitions. [2021-01-06 10:01:53,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-01-06 10:01:53,585 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:53,586 INFO L422 BasicCegarLoop]: trace histogram [22, 5, 5, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:53,792 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-01-06 10:01:53,793 INFO L429 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:53,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:53,793 INFO L82 PathProgramCache]: Analyzing trace with hash -930800898, now seen corresponding path program 18 times [2021-01-06 10:01:53,794 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:53,794 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [774404472] [2021-01-06 10:01:53,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:53,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:54,195 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-01-06 10:01:54,195 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [774404472] [2021-01-06 10:01:54,196 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1736181363] [2021-01-06 10:01:54,196 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:55,047 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-01-06 10:01:55,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:55,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 30 conjunts are in the unsatisfiable core [2021-01-06 10:01:55,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:55,057 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-01-06 10:01:55,058 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:01:55,065 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:01:55,066 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-01-06 10:01:55,066 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:10 [2021-01-06 10:01:55,220 INFO L173 IndexEqualityManager]: detected equality via solver [2021-01-06 10:01:55,232 INFO L348 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-01-06 10:01:55,232 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-01-06 10:01:55,234 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:01:55,243 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:01:55,244 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-01-06 10:01:55,244 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:35, output treesize:31 [2021-01-06 10:01:55,507 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2021-01-06 10:01:55,509 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2021-01-06 10:01:55,512 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 5 disjuncts [2021-01-06 10:01:55,559 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 6 proven. 42 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-01-06 10:01:55,560 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:55,560 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 12] total 35 [2021-01-06 10:01:55,560 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773828522] [2021-01-06 10:01:55,560 INFO L461 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-01-06 10:01:55,561 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:55,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-01-06 10:01:55,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=333, Invalid=857, Unknown=0, NotChecked=0, Total=1190 [2021-01-06 10:01:55,562 INFO L87 Difference]: Start difference. First operand 57 states and 64 transitions. Second operand 35 states. [2021-01-06 10:01:56,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:56,898 INFO L93 Difference]: Finished difference Result 111 states and 128 transitions. [2021-01-06 10:01:56,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-01-06 10:01:56,899 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 56 [2021-01-06 10:01:56,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:56,900 INFO L225 Difference]: With dead ends: 111 [2021-01-06 10:01:56,900 INFO L226 Difference]: Without dead ends: 61 [2021-01-06 10:01:56,901 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 691 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1025, Invalid=2757, Unknown=0, NotChecked=0, Total=3782 [2021-01-06 10:01:56,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-01-06 10:01:56,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-01-06 10:01:56,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2021-01-06 10:01:56,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 69 transitions. [2021-01-06 10:01:56,906 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 69 transitions. Word has length 56 [2021-01-06 10:01:56,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:56,907 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 69 transitions. [2021-01-06 10:01:56,907 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2021-01-06 10:01:56,907 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 69 transitions. [2021-01-06 10:01:56,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-01-06 10:01:56,907 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:56,908 INFO L422 BasicCegarLoop]: trace histogram [23, 6, 6, 5, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:57,122 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:57,123 INFO L429 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:57,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:57,124 INFO L82 PathProgramCache]: Analyzing trace with hash 403336971, now seen corresponding path program 19 times [2021-01-06 10:01:57,124 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:57,124 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [100231550] [2021-01-06 10:01:57,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:57,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:57,561 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-01-06 10:01:57,561 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [100231550] [2021-01-06 10:01:57,561 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1148146981] [2021-01-06 10:01:57,561 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:57,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:57,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 25 conjunts are in the unsatisfiable core [2021-01-06 10:01:57,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:57,727 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-01-06 10:01:57,728 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:57,728 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 27 [2021-01-06 10:01:57,728 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629678456] [2021-01-06 10:01:57,729 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-01-06 10:01:57,734 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:57,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-01-06 10:01:57,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2021-01-06 10:01:57,736 INFO L87 Difference]: Start difference. First operand 61 states and 69 transitions. Second operand 27 states. [2021-01-06 10:01:57,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:57,779 INFO L93 Difference]: Finished difference Result 97 states and 113 transitions. [2021-01-06 10:01:57,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-01-06 10:01:57,780 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 60 [2021-01-06 10:01:57,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:57,780 INFO L225 Difference]: With dead ends: 97 [2021-01-06 10:01:57,780 INFO L226 Difference]: Without dead ends: 62 [2021-01-06 10:01:57,781 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2021-01-06 10:01:57,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-01-06 10:01:57,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2021-01-06 10:01:57,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2021-01-06 10:01:57,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 70 transitions. [2021-01-06 10:01:57,787 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 70 transitions. Word has length 60 [2021-01-06 10:01:57,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:57,787 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 70 transitions. [2021-01-06 10:01:57,787 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2021-01-06 10:01:57,787 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 70 transitions. [2021-01-06 10:01:57,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-01-06 10:01:57,788 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:57,788 INFO L422 BasicCegarLoop]: trace histogram [24, 6, 6, 5, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:58,002 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-01-06 10:01:58,003 INFO L429 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:58,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:58,004 INFO L82 PathProgramCache]: Analyzing trace with hash -1807808592, now seen corresponding path program 20 times [2021-01-06 10:01:58,004 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:58,004 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [976854905] [2021-01-06 10:01:58,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:58,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:58,455 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-01-06 10:01:58,456 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [976854905] [2021-01-06 10:01:58,456 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [685664501] [2021-01-06 10:01:58,456 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:58,558 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 10:01:58,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:58,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 26 conjunts are in the unsatisfiable core [2021-01-06 10:01:58,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:58,639 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-01-06 10:01:58,639 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:58,639 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2021-01-06 10:01:58,640 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036006466] [2021-01-06 10:01:58,640 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-01-06 10:01:58,640 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:58,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-01-06 10:01:58,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2021-01-06 10:01:58,644 INFO L87 Difference]: Start difference. First operand 62 states and 70 transitions. Second operand 28 states. [2021-01-06 10:01:58,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:58,714 INFO L93 Difference]: Finished difference Result 98 states and 114 transitions. [2021-01-06 10:01:58,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-01-06 10:01:58,715 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 61 [2021-01-06 10:01:58,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:58,717 INFO L225 Difference]: With dead ends: 98 [2021-01-06 10:01:58,717 INFO L226 Difference]: Without dead ends: 63 [2021-01-06 10:01:58,718 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2021-01-06 10:01:58,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-01-06 10:01:58,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-01-06 10:01:58,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2021-01-06 10:01:58,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 71 transitions. [2021-01-06 10:01:58,727 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 71 transitions. Word has length 61 [2021-01-06 10:01:58,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:58,727 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 71 transitions. [2021-01-06 10:01:58,727 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2021-01-06 10:01:58,727 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 71 transitions. [2021-01-06 10:01:58,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-01-06 10:01:58,729 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:58,729 INFO L422 BasicCegarLoop]: trace histogram [25, 6, 6, 5, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:58,942 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:58,943 INFO L429 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:58,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:58,944 INFO L82 PathProgramCache]: Analyzing trace with hash -1633844309, now seen corresponding path program 21 times [2021-01-06 10:01:58,944 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:58,944 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556361568] [2021-01-06 10:01:58,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:58,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:59,490 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-01-06 10:01:59,491 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556361568] [2021-01-06 10:01:59,491 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1267834106] [2021-01-06 10:01:59,491 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:59,717 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-01-06 10:01:59,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:59,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 37 conjunts are in the unsatisfiable core [2021-01-06 10:01:59,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:59,730 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-01-06 10:01:59,732 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:01:59,740 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:01:59,741 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-01-06 10:01:59,741 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:14 [2021-01-06 10:01:59,937 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 19 [2021-01-06 10:01:59,938 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:01:59,949 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:01:59,950 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-01-06 10:01:59,951 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:29 [2021-01-06 10:02:00,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-01-06 10:02:00,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-01-06 10:02:00,017 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 44 [2021-01-06 10:02:00,018 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:02:00,032 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:02:00,034 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-01-06 10:02:00,034 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:52, output treesize:48 [2021-01-06 10:02:00,539 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2021-01-06 10:02:00,540 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:02:00,540 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 13] total 39 [2021-01-06 10:02:00,540 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126267121] [2021-01-06 10:02:00,541 INFO L461 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-01-06 10:02:00,541 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:02:00,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-01-06 10:02:00,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1078, Unknown=0, NotChecked=0, Total=1482 [2021-01-06 10:02:00,542 INFO L87 Difference]: Start difference. First operand 63 states and 71 transitions. Second operand 39 states. [2021-01-06 10:02:03,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:02:03,048 INFO L93 Difference]: Finished difference Result 106 states and 123 transitions. [2021-01-06 10:02:03,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-01-06 10:02:03,050 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 62 [2021-01-06 10:02:03,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:02:03,051 INFO L225 Difference]: With dead ends: 106 [2021-01-06 10:02:03,051 INFO L226 Difference]: Without dead ends: 71 [2021-01-06 10:02:03,053 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 904 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1201, Invalid=3911, Unknown=0, NotChecked=0, Total=5112 [2021-01-06 10:02:03,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-01-06 10:02:03,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2021-01-06 10:02:03,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2021-01-06 10:02:03,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 76 transitions. [2021-01-06 10:02:03,059 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 76 transitions. Word has length 62 [2021-01-06 10:02:03,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:02:03,059 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 76 transitions. [2021-01-06 10:02:03,059 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2021-01-06 10:02:03,059 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 76 transitions. [2021-01-06 10:02:03,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-01-06 10:02:03,060 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:02:03,060 INFO L422 BasicCegarLoop]: trace histogram [26, 6, 6, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:02:03,270 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-01-06 10:02:03,271 INFO L429 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:02:03,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:02:03,271 INFO L82 PathProgramCache]: Analyzing trace with hash -1589909818, now seen corresponding path program 22 times [2021-01-06 10:02:03,272 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:02:03,272 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1004130932] [2021-01-06 10:02:03,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:02:03,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:02:03,787 INFO L134 CoverageAnalysis]: Checked inductivity of 428 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-01-06 10:02:03,787 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1004130932] [2021-01-06 10:02:03,787 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [194163031] [2021-01-06 10:02:03,788 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:02:03,907 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 10:02:03,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:02:03,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 28 conjunts are in the unsatisfiable core [2021-01-06 10:02:03,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:02:04,009 INFO L134 CoverageAnalysis]: Checked inductivity of 428 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-01-06 10:02:04,009 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:02:04,009 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2021-01-06 10:02:04,010 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113590143] [2021-01-06 10:02:04,010 INFO L461 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-01-06 10:02:04,010 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:02:04,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-01-06 10:02:04,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2021-01-06 10:02:04,011 INFO L87 Difference]: Start difference. First operand 68 states and 76 transitions. Second operand 30 states. [2021-01-06 10:02:04,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:02:04,066 INFO L93 Difference]: Finished difference Result 108 states and 124 transitions. [2021-01-06 10:02:04,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-01-06 10:02:04,067 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2021-01-06 10:02:04,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:02:04,068 INFO L225 Difference]: With dead ends: 108 [2021-01-06 10:02:04,068 INFO L226 Difference]: Without dead ends: 69 [2021-01-06 10:02:04,070 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2021-01-06 10:02:04,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-01-06 10:02:04,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-01-06 10:02:04,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2021-01-06 10:02:04,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 77 transitions. [2021-01-06 10:02:04,076 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 77 transitions. Word has length 67 [2021-01-06 10:02:04,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:02:04,076 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 77 transitions. [2021-01-06 10:02:04,076 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2021-01-06 10:02:04,077 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 77 transitions. [2021-01-06 10:02:04,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-01-06 10:02:04,077 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:02:04,077 INFO L422 BasicCegarLoop]: trace histogram [27, 6, 6, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:02:04,290 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-01-06 10:02:04,291 INFO L429 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:02:04,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:02:04,291 INFO L82 PathProgramCache]: Analyzing trace with hash 1766734465, now seen corresponding path program 23 times [2021-01-06 10:02:04,292 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:02:04,292 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [526002477] [2021-01-06 10:02:04,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:02:04,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:02:04,894 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-01-06 10:02:04,895 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [526002477] [2021-01-06 10:02:04,895 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909690285] [2021-01-06 10:02:04,895 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:02:11,291 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 15 check-sat command(s) [2021-01-06 10:02:11,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:02:11,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 29 conjunts are in the unsatisfiable core [2021-01-06 10:02:11,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:02:11,385 INFO L134 CoverageAnalysis]: Checked inductivity of 455 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-01-06 10:02:11,386 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:02:11,386 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 31 [2021-01-06 10:02:11,386 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127471265] [2021-01-06 10:02:11,386 INFO L461 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-01-06 10:02:11,387 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:02:11,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-01-06 10:02:11,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2021-01-06 10:02:11,388 INFO L87 Difference]: Start difference. First operand 69 states and 77 transitions. Second operand 31 states. [2021-01-06 10:02:11,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:02:11,447 INFO L93 Difference]: Finished difference Result 109 states and 125 transitions. [2021-01-06 10:02:11,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-01-06 10:02:11,447 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 68 [2021-01-06 10:02:11,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:02:11,448 INFO L225 Difference]: With dead ends: 109 [2021-01-06 10:02:11,448 INFO L226 Difference]: Without dead ends: 70 [2021-01-06 10:02:11,449 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2021-01-06 10:02:11,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-01-06 10:02:11,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2021-01-06 10:02:11,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2021-01-06 10:02:11,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 78 transitions. [2021-01-06 10:02:11,455 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 78 transitions. Word has length 68 [2021-01-06 10:02:11,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:02:11,455 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 78 transitions. [2021-01-06 10:02:11,455 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2021-01-06 10:02:11,455 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 78 transitions. [2021-01-06 10:02:11,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-01-06 10:02:11,456 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:02:11,456 INFO L422 BasicCegarLoop]: trace histogram [28, 6, 6, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:02:11,671 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:02:11,671 INFO L429 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:02:11,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:02:11,672 INFO L82 PathProgramCache]: Analyzing trace with hash -1551475162, now seen corresponding path program 24 times [2021-01-06 10:02:11,672 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:02:11,672 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [72985617] [2021-01-06 10:02:11,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:02:11,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:02:12,325 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-01-06 10:02:12,325 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [72985617] [2021-01-06 10:02:12,325 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1576404325] [2021-01-06 10:02:12,326 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:02:16,071 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2021-01-06 10:02:16,071 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:02:16,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 27 conjunts are in the unsatisfiable core [2021-01-06 10:02:16,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:02:16,088 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-01-06 10:02:16,090 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:02:16,095 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:02:16,096 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-01-06 10:02:16,096 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:12, output treesize:8 [2021-01-06 10:02:16,295 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 23 [2021-01-06 10:02:16,296 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:02:16,305 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:02:16,306 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-01-06 10:02:16,306 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:32 [2021-01-06 10:02:16,760 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2021-01-06 10:02:16,763 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2021-01-06 10:02:16,765 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2021-01-06 10:02:16,768 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2021-01-06 10:02:16,770 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 6 disjuncts [2021-01-06 10:02:16,839 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 28 proven. 49 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2021-01-06 10:02:16,839 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:02:16,839 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 14] total 43 [2021-01-06 10:02:16,840 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381518458] [2021-01-06 10:02:16,840 INFO L461 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-01-06 10:02:16,840 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:02:16,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-01-06 10:02:16,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=514, Invalid=1292, Unknown=0, NotChecked=0, Total=1806 [2021-01-06 10:02:16,842 INFO L87 Difference]: Start difference. First operand 70 states and 78 transitions. Second operand 43 states. [2021-01-06 10:02:18,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:02:18,749 INFO L93 Difference]: Finished difference Result 135 states and 154 transitions. [2021-01-06 10:02:18,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-01-06 10:02:18,750 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 69 [2021-01-06 10:02:18,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:02:18,751 INFO L225 Difference]: With dead ends: 135 [2021-01-06 10:02:18,751 INFO L226 Difference]: Without dead ends: 74 [2021-01-06 10:02:18,755 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1091 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1595, Invalid=4257, Unknown=0, NotChecked=0, Total=5852 [2021-01-06 10:02:18,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-01-06 10:02:18,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2021-01-06 10:02:18,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2021-01-06 10:02:18,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 83 transitions. [2021-01-06 10:02:18,760 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 83 transitions. Word has length 69 [2021-01-06 10:02:18,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:02:18,760 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 83 transitions. [2021-01-06 10:02:18,761 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2021-01-06 10:02:18,761 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 83 transitions. [2021-01-06 10:02:18,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-01-06 10:02:18,761 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:02:18,762 INFO L422 BasicCegarLoop]: trace histogram [29, 7, 7, 6, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:02:18,962 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:02:18,962 INFO L429 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:02:18,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:02:18,963 INFO L82 PathProgramCache]: Analyzing trace with hash -2124037767, now seen corresponding path program 25 times [2021-01-06 10:02:18,964 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:02:18,964 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [474442316] [2021-01-06 10:02:18,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:02:18,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:02:19,685 INFO L134 CoverageAnalysis]: Checked inductivity of 530 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-01-06 10:02:19,686 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [474442316] [2021-01-06 10:02:19,686 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [34502489] [2021-01-06 10:02:19,686 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:02:19,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:02:19,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 31 conjunts are in the unsatisfiable core [2021-01-06 10:02:19,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:02:19,879 INFO L134 CoverageAnalysis]: Checked inductivity of 530 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-01-06 10:02:19,879 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:02:19,879 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32] total 33 [2021-01-06 10:02:19,879 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74166855] [2021-01-06 10:02:19,880 INFO L461 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-01-06 10:02:19,880 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:02:19,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-01-06 10:02:19,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2021-01-06 10:02:19,881 INFO L87 Difference]: Start difference. First operand 74 states and 83 transitions. Second operand 33 states. [2021-01-06 10:02:19,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:02:19,941 INFO L93 Difference]: Finished difference Result 117 states and 135 transitions. [2021-01-06 10:02:19,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-01-06 10:02:19,942 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2021-01-06 10:02:19,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:02:19,943 INFO L225 Difference]: With dead ends: 117 [2021-01-06 10:02:19,943 INFO L226 Difference]: Without dead ends: 75 [2021-01-06 10:02:19,943 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2021-01-06 10:02:19,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-01-06 10:02:19,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-01-06 10:02:19,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2021-01-06 10:02:19,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 84 transitions. [2021-01-06 10:02:19,950 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 84 transitions. Word has length 73 [2021-01-06 10:02:19,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:02:19,950 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 84 transitions. [2021-01-06 10:02:19,950 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2021-01-06 10:02:19,950 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 84 transitions. [2021-01-06 10:02:19,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-01-06 10:02:19,951 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:02:19,951 INFO L422 BasicCegarLoop]: trace histogram [30, 7, 7, 6, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:02:20,164 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-01-06 10:02:20,165 INFO L429 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:02:20,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:02:20,166 INFO L82 PathProgramCache]: Analyzing trace with hash -1118102284, now seen corresponding path program 26 times [2021-01-06 10:02:20,166 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:02:20,166 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [403543244] [2021-01-06 10:02:20,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:02:20,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:02:20,932 INFO L134 CoverageAnalysis]: Checked inductivity of 560 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-01-06 10:02:20,932 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [403543244] [2021-01-06 10:02:20,932 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [762697772] [2021-01-06 10:02:20,932 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:02:21,036 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 10:02:21,036 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:02:21,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 32 conjunts are in the unsatisfiable core [2021-01-06 10:02:21,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:02:21,130 INFO L134 CoverageAnalysis]: Checked inductivity of 560 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-01-06 10:02:21,130 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:02:21,130 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 34 [2021-01-06 10:02:21,130 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806681801] [2021-01-06 10:02:21,131 INFO L461 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-01-06 10:02:21,131 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:02:21,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-01-06 10:02:21,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2021-01-06 10:02:21,132 INFO L87 Difference]: Start difference. First operand 75 states and 84 transitions. Second operand 34 states. [2021-01-06 10:02:21,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:02:21,204 INFO L93 Difference]: Finished difference Result 118 states and 136 transitions. [2021-01-06 10:02:21,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-01-06 10:02:21,205 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 74 [2021-01-06 10:02:21,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:02:21,205 INFO L225 Difference]: With dead ends: 118 [2021-01-06 10:02:21,206 INFO L226 Difference]: Without dead ends: 76 [2021-01-06 10:02:21,206 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2021-01-06 10:02:21,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-01-06 10:02:21,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2021-01-06 10:02:21,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2021-01-06 10:02:21,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 85 transitions. [2021-01-06 10:02:21,213 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 85 transitions. Word has length 74 [2021-01-06 10:02:21,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:02:21,213 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 85 transitions. [2021-01-06 10:02:21,213 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2021-01-06 10:02:21,213 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 85 transitions. [2021-01-06 10:02:21,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-01-06 10:02:21,214 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:02:21,214 INFO L422 BasicCegarLoop]: trace histogram [31, 7, 7, 6, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:02:21,428 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:02:21,429 INFO L429 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:02:21,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:02:21,429 INFO L82 PathProgramCache]: Analyzing trace with hash 1126617, now seen corresponding path program 27 times [2021-01-06 10:02:21,430 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:02:21,430 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [259625309] [2021-01-06 10:02:21,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:02:21,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:02:22,210 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-01-06 10:02:22,210 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [259625309] [2021-01-06 10:02:22,210 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [572523081] [2021-01-06 10:02:22,210 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:02:22,691 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-01-06 10:02:22,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:02:22,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 39 conjunts are in the unsatisfiable core [2021-01-06 10:02:22,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:02:22,704 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-01-06 10:02:22,705 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:02:22,710 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:02:22,711 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-01-06 10:02:22,711 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:12, output treesize:8 [2021-01-06 10:02:22,923 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 19 [2021-01-06 10:02:22,924 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:02:22,932 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:02:22,933 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-01-06 10:02:22,933 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:23 [2021-01-06 10:02:23,009 INFO L348 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:02:23,010 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 39 treesize of output 88 [2021-01-06 10:02:23,012 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:02:23,037 INFO L625 ElimStorePlain]: treesize reduction 54, result has 43.8 percent of original size [2021-01-06 10:02:23,039 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-01-06 10:02:23,039 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:46, output treesize:42 [2021-01-06 10:02:23,768 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 0 proven. 95 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2021-01-06 10:02:23,768 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:02:23,768 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 16] total 48 [2021-01-06 10:02:23,768 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615975786] [2021-01-06 10:02:23,769 INFO L461 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-01-06 10:02:23,769 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:02:23,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-01-06 10:02:23,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=596, Invalid=1660, Unknown=0, NotChecked=0, Total=2256 [2021-01-06 10:02:23,770 INFO L87 Difference]: Start difference. First operand 76 states and 85 transitions. Second operand 48 states. [2021-01-06 10:02:26,174 WARN L197 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 40 [2021-01-06 10:02:27,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:02:27,181 INFO L93 Difference]: Finished difference Result 126 states and 145 transitions. [2021-01-06 10:02:27,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-01-06 10:02:27,182 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 75 [2021-01-06 10:02:27,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:02:27,183 INFO L225 Difference]: With dead ends: 126 [2021-01-06 10:02:27,183 INFO L226 Difference]: Without dead ends: 84 [2021-01-06 10:02:27,187 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1533 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=1793, Invalid=6397, Unknown=0, NotChecked=0, Total=8190 [2021-01-06 10:02:27,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-01-06 10:02:27,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 81. [2021-01-06 10:02:27,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2021-01-06 10:02:27,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 90 transitions. [2021-01-06 10:02:27,193 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 90 transitions. Word has length 75 [2021-01-06 10:02:27,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:02:27,193 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 90 transitions. [2021-01-06 10:02:27,193 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2021-01-06 10:02:27,193 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 90 transitions. [2021-01-06 10:02:27,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-01-06 10:02:27,194 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:02:27,194 INFO L422 BasicCegarLoop]: trace histogram [32, 7, 7, 6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:02:27,402 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-01-06 10:02:27,403 INFO L429 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:02:27,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:02:27,403 INFO L82 PathProgramCache]: Analyzing trace with hash 985012042, now seen corresponding path program 28 times [2021-01-06 10:02:27,403 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:02:27,404 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [177269623] [2021-01-06 10:02:27,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:02:27,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:02:28,169 INFO L134 CoverageAnalysis]: Checked inductivity of 641 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2021-01-06 10:02:28,169 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [177269623] [2021-01-06 10:02:28,170 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1453576909] [2021-01-06 10:02:28,170 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:02:28,345 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 10:02:28,345 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:02:28,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 375 conjuncts, 34 conjunts are in the unsatisfiable core [2021-01-06 10:02:28,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:02:28,441 INFO L134 CoverageAnalysis]: Checked inductivity of 641 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2021-01-06 10:02:28,441 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:02:28,442 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 36 [2021-01-06 10:02:28,442 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747394350] [2021-01-06 10:02:28,442 INFO L461 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-01-06 10:02:28,442 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:02:28,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-01-06 10:02:28,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2021-01-06 10:02:28,443 INFO L87 Difference]: Start difference. First operand 81 states and 90 transitions. Second operand 36 states. [2021-01-06 10:02:28,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:02:28,513 INFO L93 Difference]: Finished difference Result 128 states and 146 transitions. [2021-01-06 10:02:28,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-01-06 10:02:28,514 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 80 [2021-01-06 10:02:28,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:02:28,515 INFO L225 Difference]: With dead ends: 128 [2021-01-06 10:02:28,515 INFO L226 Difference]: Without dead ends: 82 [2021-01-06 10:02:28,515 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2021-01-06 10:02:28,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-01-06 10:02:28,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-01-06 10:02:28,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2021-01-06 10:02:28,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 91 transitions. [2021-01-06 10:02:28,522 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 91 transitions. Word has length 80 [2021-01-06 10:02:28,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:02:28,522 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 91 transitions. [2021-01-06 10:02:28,522 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2021-01-06 10:02:28,523 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 91 transitions. [2021-01-06 10:02:28,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-01-06 10:02:28,523 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:02:28,523 INFO L422 BasicCegarLoop]: trace histogram [33, 7, 7, 6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:02:28,738 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-01-06 10:02:28,739 INFO L429 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:02:28,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:02:28,740 INFO L82 PathProgramCache]: Analyzing trace with hash -2059080849, now seen corresponding path program 29 times [2021-01-06 10:02:28,740 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:02:28,740 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501762943] [2021-01-06 10:02:28,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:02:28,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:02:29,644 INFO L134 CoverageAnalysis]: Checked inductivity of 674 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2021-01-06 10:02:29,644 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501762943] [2021-01-06 10:02:29,644 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [14453860] [2021-01-06 10:02:29,644 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:03:22,578 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2021-01-06 10:03:22,578 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:03:22,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 35 conjunts are in the unsatisfiable core [2021-01-06 10:03:22,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:03:22,761 INFO L134 CoverageAnalysis]: Checked inductivity of 674 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2021-01-06 10:03:22,761 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:03:22,761 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36] total 37 [2021-01-06 10:03:22,762 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360327809] [2021-01-06 10:03:22,762 INFO L461 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-01-06 10:03:22,762 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:03:22,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-01-06 10:03:22,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2021-01-06 10:03:22,763 INFO L87 Difference]: Start difference. First operand 82 states and 91 transitions. Second operand 37 states. [2021-01-06 10:03:22,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:03:22,838 INFO L93 Difference]: Finished difference Result 129 states and 147 transitions. [2021-01-06 10:03:22,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-01-06 10:03:22,839 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2021-01-06 10:03:22,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:03:22,839 INFO L225 Difference]: With dead ends: 129 [2021-01-06 10:03:22,840 INFO L226 Difference]: Without dead ends: 83 [2021-01-06 10:03:22,840 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2021-01-06 10:03:22,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-01-06 10:03:22,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-01-06 10:03:22,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2021-01-06 10:03:22,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 92 transitions. [2021-01-06 10:03:22,847 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 92 transitions. Word has length 81 [2021-01-06 10:03:22,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:03:22,848 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 92 transitions. [2021-01-06 10:03:22,848 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2021-01-06 10:03:22,848 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 92 transitions. [2021-01-06 10:03:22,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-01-06 10:03:22,848 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:03:22,848 INFO L422 BasicCegarLoop]: trace histogram [34, 7, 7, 6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:03:23,063 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-01-06 10:03:23,063 INFO L429 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:03:23,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:03:23,064 INFO L82 PathProgramCache]: Analyzing trace with hash -1936679958, now seen corresponding path program 30 times [2021-01-06 10:03:23,064 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:03:23,065 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [512008329] [2021-01-06 10:03:23,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:03:23,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:03:24,022 INFO L134 CoverageAnalysis]: Checked inductivity of 708 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2021-01-06 10:03:24,023 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [512008329] [2021-01-06 10:03:24,023 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [359109034] [2021-01-06 10:03:24,023 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:03:29,791 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-01-06 10:03:29,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:03:29,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 53 conjunts are in the unsatisfiable core [2021-01-06 10:03:29,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:03:29,814 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-01-06 10:03:29,816 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:03:29,828 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:03:29,829 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-01-06 10:03:29,829 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:21, output treesize:17 [2021-01-06 10:03:30,280 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 23 [2021-01-06 10:03:30,281 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:03:30,298 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:03:30,299 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-01-06 10:03:30,300 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:42, output treesize:38 [2021-01-06 10:03:31,180 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2021-01-06 10:03:31,182 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2021-01-06 10:03:31,183 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2021-01-06 10:03:31,184 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 5 disjuncts [2021-01-06 10:03:31,282 INFO L134 CoverageAnalysis]: Checked inductivity of 708 backedges. 0 proven. 273 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2021-01-06 10:03:31,282 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:03:31,283 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 22] total 57 [2021-01-06 10:03:31,283 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650544931] [2021-01-06 10:03:31,283 INFO L461 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-01-06 10:03:31,283 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:03:31,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-01-06 10:03:31,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=924, Invalid=2268, Unknown=0, NotChecked=0, Total=3192 [2021-01-06 10:03:31,284 INFO L87 Difference]: Start difference. First operand 83 states and 92 transitions. Second operand 57 states. [2021-01-06 10:03:34,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:03:34,638 INFO L93 Difference]: Finished difference Result 165 states and 186 transitions. [2021-01-06 10:03:34,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-01-06 10:03:34,639 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 82 [2021-01-06 10:03:34,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:03:34,639 INFO L225 Difference]: With dead ends: 165 [2021-01-06 10:03:34,640 INFO L226 Difference]: Without dead ends: 119 [2021-01-06 10:03:34,641 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2145 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=2277, Invalid=6843, Unknown=0, NotChecked=0, Total=9120 [2021-01-06 10:03:34,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-01-06 10:03:34,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 92. [2021-01-06 10:03:34,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2021-01-06 10:03:34,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 103 transitions. [2021-01-06 10:03:34,650 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 103 transitions. Word has length 82 [2021-01-06 10:03:34,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:03:34,651 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 103 transitions. [2021-01-06 10:03:34,651 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2021-01-06 10:03:34,651 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 103 transitions. [2021-01-06 10:03:34,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-01-06 10:03:34,658 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:03:34,659 INFO L422 BasicCegarLoop]: trace histogram [35, 8, 8, 7, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:03:34,868 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-01-06 10:03:34,869 INFO L429 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:03:34,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:03:34,870 INFO L82 PathProgramCache]: Analyzing trace with hash -1657309897, now seen corresponding path program 31 times [2021-01-06 10:03:34,870 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:03:34,870 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076853825] [2021-01-06 10:03:34,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:03:34,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:03:35,877 INFO L134 CoverageAnalysis]: Checked inductivity of 764 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 134 trivial. 0 not checked. [2021-01-06 10:03:35,877 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076853825] [2021-01-06 10:03:35,878 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1300057048] [2021-01-06 10:03:35,878 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:03:35,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:03:36,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 37 conjunts are in the unsatisfiable core [2021-01-06 10:03:36,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:03:36,101 INFO L134 CoverageAnalysis]: Checked inductivity of 764 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 134 trivial. 0 not checked. [2021-01-06 10:03:36,101 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:03:36,102 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38] total 39 [2021-01-06 10:03:36,102 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049459416] [2021-01-06 10:03:36,103 INFO L461 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-01-06 10:03:36,103 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:03:36,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-01-06 10:03:36,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2021-01-06 10:03:36,105 INFO L87 Difference]: Start difference. First operand 92 states and 103 transitions. Second operand 39 states. [2021-01-06 10:03:36,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:03:36,181 INFO L93 Difference]: Finished difference Result 147 states and 169 transitions. [2021-01-06 10:03:36,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-01-06 10:03:36,182 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 86 [2021-01-06 10:03:36,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:03:36,183 INFO L225 Difference]: With dead ends: 147 [2021-01-06 10:03:36,183 INFO L226 Difference]: Without dead ends: 93 [2021-01-06 10:03:36,184 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2021-01-06 10:03:36,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-01-06 10:03:36,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-01-06 10:03:36,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2021-01-06 10:03:36,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 104 transitions. [2021-01-06 10:03:36,193 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 104 transitions. Word has length 86 [2021-01-06 10:03:36,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:03:36,193 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 104 transitions. [2021-01-06 10:03:36,193 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2021-01-06 10:03:36,193 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 104 transitions. [2021-01-06 10:03:36,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-01-06 10:03:36,194 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:03:36,194 INFO L422 BasicCegarLoop]: trace histogram [36, 8, 8, 7, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:03:36,409 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-01-06 10:03:36,409 INFO L429 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:03:36,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:03:36,410 INFO L82 PathProgramCache]: Analyzing trace with hash -1818371684, now seen corresponding path program 32 times [2021-01-06 10:03:36,410 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:03:36,411 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [529111202] [2021-01-06 10:03:36,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:03:36,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:03:37,514 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 134 trivial. 0 not checked. [2021-01-06 10:03:37,515 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [529111202] [2021-01-06 10:03:37,515 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [505295794] [2021-01-06 10:03:37,515 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:03:37,636 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 10:03:37,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:03:37,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 408 conjuncts, 38 conjunts are in the unsatisfiable core [2021-01-06 10:03:37,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:03:37,741 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 134 trivial. 0 not checked. [2021-01-06 10:03:37,741 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:03:37,741 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39] total 40 [2021-01-06 10:03:37,741 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389659644] [2021-01-06 10:03:37,742 INFO L461 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-01-06 10:03:37,742 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:03:37,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-01-06 10:03:37,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2021-01-06 10:03:37,743 INFO L87 Difference]: Start difference. First operand 93 states and 104 transitions. Second operand 40 states. [2021-01-06 10:03:37,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:03:37,809 INFO L93 Difference]: Finished difference Result 148 states and 170 transitions. [2021-01-06 10:03:37,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-01-06 10:03:37,810 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2021-01-06 10:03:37,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:03:37,811 INFO L225 Difference]: With dead ends: 148 [2021-01-06 10:03:37,811 INFO L226 Difference]: Without dead ends: 94 [2021-01-06 10:03:37,812 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2021-01-06 10:03:37,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-01-06 10:03:37,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2021-01-06 10:03:37,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2021-01-06 10:03:37,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 105 transitions. [2021-01-06 10:03:37,820 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 105 transitions. Word has length 87 [2021-01-06 10:03:37,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:03:37,820 INFO L481 AbstractCegarLoop]: Abstraction has 94 states and 105 transitions. [2021-01-06 10:03:37,820 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2021-01-06 10:03:37,821 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 105 transitions. [2021-01-06 10:03:37,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-01-06 10:03:37,821 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:03:37,821 INFO L422 BasicCegarLoop]: trace histogram [37, 8, 8, 7, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:03:38,036 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-01-06 10:03:38,037 INFO L429 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:03:38,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:03:38,037 INFO L82 PathProgramCache]: Analyzing trace with hash 1778647511, now seen corresponding path program 33 times [2021-01-06 10:03:38,038 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:03:38,038 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1037039197] [2021-01-06 10:03:38,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:03:38,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:03:39,181 INFO L134 CoverageAnalysis]: Checked inductivity of 837 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 134 trivial. 0 not checked. [2021-01-06 10:03:39,182 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1037039197] [2021-01-06 10:03:39,182 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1767390889] [2021-01-06 10:03:39,182 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 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:03:40,084 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-01-06 10:03:40,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:03:40,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 46 conjunts are in the unsatisfiable core [2021-01-06 10:03:40,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:03:40,100 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-01-06 10:03:40,102 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:03:40,109 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:03:40,110 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-01-06 10:03:40,110 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:14 [2021-01-06 10:03:40,483 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-01-06 10:03:40,485 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:03:40,497 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:03:40,498 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-01-06 10:03:40,498 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:39, output treesize:35 [2021-01-06 10:03:40,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-01-06 10:03:40,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-01-06 10:03:40,575 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 40 [2021-01-06 10:03:40,577 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 10:03:40,591 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-01-06 10:03:40,592 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-01-06 10:03:40,592 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:45, output treesize:41 [2021-01-06 10:03:41,335 INFO L134 CoverageAnalysis]: Checked inductivity of 837 backedges. 0 proven. 134 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2021-01-06 10:03:41,335 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:03:41,335 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 17] total 55 [2021-01-06 10:03:41,336 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133207614] [2021-01-06 10:03:41,336 INFO L461 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-01-06 10:03:41,336 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:03:41,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-01-06 10:03:41,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=816, Invalid=2154, Unknown=0, NotChecked=0, Total=2970 [2021-01-06 10:03:41,337 INFO L87 Difference]: Start difference. First operand 94 states and 105 transitions. Second operand 55 states. [2021-01-06 10:03:45,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:03:45,226 INFO L93 Difference]: Finished difference Result 180 states and 203 transitions. [2021-01-06 10:03:45,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-01-06 10:03:45,228 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 88 [2021-01-06 10:03:45,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:03:45,229 INFO L225 Difference]: With dead ends: 180 [2021-01-06 10:03:45,229 INFO L226 Difference]: Without dead ends: 126 [2021-01-06 10:03:45,230 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1569 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=2384, Invalid=6546, Unknown=0, NotChecked=0, Total=8930 [2021-01-06 10:03:45,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-01-06 10:03:45,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 91. [2021-01-06 10:03:45,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2021-01-06 10:03:45,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 100 transitions. [2021-01-06 10:03:45,240 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 100 transitions. Word has length 88 [2021-01-06 10:03:45,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:03:45,240 INFO L481 AbstractCegarLoop]: Abstraction has 91 states and 100 transitions. [2021-01-06 10:03:45,240 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2021-01-06 10:03:45,240 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 100 transitions. [2021-01-06 10:03:45,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-01-06 10:03:45,241 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:03:45,241 INFO L422 BasicCegarLoop]: trace histogram [38, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:03:45,445 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-01-06 10:03:45,446 INFO L429 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:03:45,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:03:45,447 INFO L82 PathProgramCache]: Analyzing trace with hash -79925280, now seen corresponding path program 34 times [2021-01-06 10:03:45,447 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:03:45,447 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724831963] [2021-01-06 10:03:45,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:03:45,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:03:46,626 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2021-01-06 10:03:46,627 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724831963] [2021-01-06 10:03:46,627 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1549734047] [2021-01-06 10:03:46,627 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:03:46,826 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 10:03:46,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:03:46,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 15 conjunts are in the unsatisfiable core [2021-01-06 10:03:46,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:03:47,535 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 72 proven. 63 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2021-01-06 10:03:47,535 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:03:47,535 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 16] total 55 [2021-01-06 10:03:47,536 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153696309] [2021-01-06 10:03:47,536 INFO L461 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-01-06 10:03:47,536 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:03:47,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-01-06 10:03:47,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=897, Invalid=2073, Unknown=0, NotChecked=0, Total=2970 [2021-01-06 10:03:47,537 INFO L87 Difference]: Start difference. First operand 91 states and 100 transitions. Second operand 55 states. [2021-01-06 10:03:49,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:03:49,701 INFO L93 Difference]: Finished difference Result 171 states and 191 transitions. [2021-01-06 10:03:49,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-01-06 10:03:49,701 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 90 [2021-01-06 10:03:49,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:03:49,702 INFO L225 Difference]: With dead ends: 171 [2021-01-06 10:03:49,702 INFO L226 Difference]: Without dead ends: 95 [2021-01-06 10:03:49,703 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1549 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2769, Invalid=5973, Unknown=0, NotChecked=0, Total=8742 [2021-01-06 10:03:49,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-01-06 10:03:49,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-01-06 10:03:49,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2021-01-06 10:03:49,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 105 transitions. [2021-01-06 10:03:49,712 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 105 transitions. Word has length 90 [2021-01-06 10:03:49,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:03:49,713 INFO L481 AbstractCegarLoop]: Abstraction has 95 states and 105 transitions. [2021-01-06 10:03:49,713 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2021-01-06 10:03:49,713 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 105 transitions. [2021-01-06 10:03:49,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-01-06 10:03:49,713 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:03:49,713 INFO L422 BasicCegarLoop]: trace histogram [39, 8, 8, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:03:49,927 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,39 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:03:49,928 INFO L429 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:03:49,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:03:49,928 INFO L82 PathProgramCache]: Analyzing trace with hash -420398419, now seen corresponding path program 35 times [2021-01-06 10:03:49,929 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:03:49,929 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1445801057] [2021-01-06 10:03:49,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:03:49,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:03:51,028 INFO L134 CoverageAnalysis]: Checked inductivity of 936 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-01-06 10:03:51,029 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1445801057] [2021-01-06 10:03:51,029 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [311745608] [2021-01-06 10:03:51,029 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:05:23,393 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2021-01-06 10:05:23,393 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:05:23,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 41 conjunts are in the unsatisfiable core [2021-01-06 10:05:23,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:05:23,609 INFO L134 CoverageAnalysis]: Checked inductivity of 936 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-01-06 10:05:23,610 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:05:23,610 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42] total 43 [2021-01-06 10:05:23,610 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707717391] [2021-01-06 10:05:23,610 INFO L461 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-01-06 10:05:23,610 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:05:23,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-01-06 10:05:23,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2021-01-06 10:05:23,611 INFO L87 Difference]: Start difference. First operand 95 states and 105 transitions. Second operand 43 states. [2021-01-06 10:05:23,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:05:23,691 INFO L93 Difference]: Finished difference Result 149 states and 169 transitions. [2021-01-06 10:05:23,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-01-06 10:05:23,692 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 94 [2021-01-06 10:05:23,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:05:23,692 INFO L225 Difference]: With dead ends: 149 [2021-01-06 10:05:23,692 INFO L226 Difference]: Without dead ends: 96 [2021-01-06 10:05:23,693 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2021-01-06 10:05:23,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-01-06 10:05:23,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2021-01-06 10:05:23,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2021-01-06 10:05:23,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 106 transitions. [2021-01-06 10:05:23,701 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 106 transitions. Word has length 94 [2021-01-06 10:05:23,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:05:23,701 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 106 transitions. [2021-01-06 10:05:23,701 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2021-01-06 10:05:23,701 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 106 transitions. [2021-01-06 10:05:23,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-01-06 10:05:23,702 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:05:23,702 INFO L422 BasicCegarLoop]: trace histogram [40, 8, 8, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:05:23,915 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,40 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:05:23,916 INFO L429 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:05:23,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:05:23,916 INFO L82 PathProgramCache]: Analyzing trace with hash 1370712594, now seen corresponding path program 36 times [2021-01-06 10:05:23,917 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:05:23,917 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761181043] [2021-01-06 10:05:23,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:05:23,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:05:25,227 INFO L134 CoverageAnalysis]: Checked inductivity of 976 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2021-01-06 10:05:25,227 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [761181043] [2021-01-06 10:05:25,227 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1951414626] [2021-01-06 10:05:25,227 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 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true