/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_two_index_05.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-178dd20 [2021-01-06 10:01:37,799 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-01-06 10:01:37,804 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-01-06 10:01:37,845 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-01-06 10:01:37,845 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-01-06 10:01:37,847 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-01-06 10:01:37,848 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-01-06 10:01:37,851 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-01-06 10:01:37,855 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-01-06 10:01:37,868 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-01-06 10:01:37,873 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-01-06 10:01:37,877 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2021-01-06 10:01:37,949 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-01-06 10:01:37,950 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-01-06 10:01:37,951 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-01-06 10:01:37,952 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 10:01:38,020 INFO L113 SettingsManager]: Loading preferences was successful [2021-01-06 10:01:38,023 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-01-06 10:01:38,026 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-01-06 10:01:38,027 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-01-06 10:01:38,028 INFO L138 SettingsManager]: * Use SBE=true [2021-01-06 10:01:38,028 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-01-06 10:01:38,028 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-01-06 10:01:38,028 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-01-06 10:01:38,029 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-01-06 10:01:38,029 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-01-06 10:01:38,030 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-01-06 10:01:38,030 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-01-06 10:01:38,030 INFO L138 SettingsManager]: * Use constant arrays=true [2021-01-06 10:01:38,031 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-01-06 10:01:38,031 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-01-06 10:01:38,031 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-01-06 10:01:38,031 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-01-06 10:01:38,031 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 10:01:38,032 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-01-06 10:01:38,032 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-01-06 10:01:38,032 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-01-06 10:01:38,032 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-01-06 10:01:38,033 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-01-06 10:01:38,033 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-01-06 10:01:38,033 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-01-06 10:01:38,033 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-01-06 10:01:38,587 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-01-06 10:01:38,623 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-01-06 10:01:38,627 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-01-06 10:01:38,630 INFO L271 PluginConnector]: Initializing CDTParser... [2021-01-06 10:01:38,631 INFO L275 PluginConnector]: CDTParser initialized [2021-01-06 10:01:38,632 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_two_index_05.i [2021-01-06 10:01:38,723 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/d035381d2/87bb45f552ab45e3b94a759a4f213c9b/FLAG6729a2f29 [2021-01-06 10:01:39,653 INFO L306 CDTParser]: Found 1 translation units. [2021-01-06 10:01:39,656 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/standard_two_index_05.i [2021-01-06 10:01:39,669 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/d035381d2/87bb45f552ab45e3b94a759a4f213c9b/FLAG6729a2f29 [2021-01-06 10:01:39,918 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/d035381d2/87bb45f552ab45e3b94a759a4f213c9b [2021-01-06 10:01:39,925 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-01-06 10:01:39,928 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-01-06 10:01:39,931 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-01-06 10:01:39,932 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-01-06 10:01:39,937 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-01-06 10:01:39,938 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 10:01:39" (1/1) ... [2021-01-06 10:01:39,945 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@16414f40 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:39, skipping insertion in model container [2021-01-06 10:01:39,946 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 10:01:39" (1/1) ... [2021-01-06 10:01:39,959 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-01-06 10:01:39,984 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-01-06 10:01:40,198 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_two_index_05.i[814,827] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~b~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[IdentifierExpression[~j~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] [2021-01-06 10:01:40,225 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 10:01:40,238 INFO L203 MainTranslator]: Completed pre-run [2021-01-06 10:01:40,260 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_two_index_05.i[814,827] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#b~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#b~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],IdentifierExpression[~i~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#a~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#a~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],IdentifierExpression[~j~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] [2021-01-06 10:01:40,272 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 10:01:40,294 INFO L208 MainTranslator]: Completed translation [2021-01-06 10:01:40,295 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:40 WrapperNode [2021-01-06 10:01:40,295 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-01-06 10:01:40,298 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-01-06 10:01:40,298 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-01-06 10:01:40,299 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-01-06 10:01:40,311 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:40" (1/1) ... [2021-01-06 10:01:40,323 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:40" (1/1) ... [2021-01-06 10:01:40,352 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-01-06 10:01:40,353 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-01-06 10:01:40,353 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-01-06 10:01:40,353 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-01-06 10:01:40,366 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:40" (1/1) ... [2021-01-06 10:01:40,367 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:40" (1/1) ... [2021-01-06 10:01:40,370 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:40" (1/1) ... [2021-01-06 10:01:40,370 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:40" (1/1) ... [2021-01-06 10:01:40,377 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:40" (1/1) ... [2021-01-06 10:01:40,383 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:40" (1/1) ... [2021-01-06 10:01:40,385 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:40" (1/1) ... [2021-01-06 10:01:40,389 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-01-06 10:01:40,390 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-01-06 10:01:40,390 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-01-06 10:01:40,390 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-01-06 10:01:40,391 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:40" (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 10:01:40,533 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-01-06 10:01:40,533 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-01-06 10:01:40,534 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-01-06 10:01:40,534 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-01-06 10:01:40,534 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-01-06 10:01:40,534 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-01-06 10:01:40,534 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-01-06 10:01:40,887 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-01-06 10:01:40,887 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2021-01-06 10:01:40,889 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 10:01:40 BoogieIcfgContainer [2021-01-06 10:01:40,889 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-01-06 10:01:40,891 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-01-06 10:01:40,892 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-01-06 10:01:40,897 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-01-06 10:01:40,898 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.01 10:01:39" (1/3) ... [2021-01-06 10:01:40,899 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76fa0d07 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 10:01:40, skipping insertion in model container [2021-01-06 10:01:40,899 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 10:01:40" (2/3) ... [2021-01-06 10:01:40,900 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76fa0d07 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 10:01:40, skipping insertion in model container [2021-01-06 10:01:40,900 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 10:01:40" (3/3) ... [2021-01-06 10:01:40,902 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_two_index_05.i [2021-01-06 10:01:40,911 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-01-06 10:01:40,916 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-01-06 10:01:40,953 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-01-06 10:01:41,051 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-01-06 10:01:41,052 INFO L378 AbstractCegarLoop]: Hoare is true [2021-01-06 10:01:41,055 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-01-06 10:01:41,055 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-01-06 10:01:41,055 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-01-06 10:01:41,055 INFO L382 AbstractCegarLoop]: Difference is false [2021-01-06 10:01:41,055 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-01-06 10:01:41,056 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-01-06 10:01:41,140 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2021-01-06 10:01:41,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-01-06 10:01:41,162 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:41,164 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:41,165 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:41,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:41,177 INFO L82 PathProgramCache]: Analyzing trace with hash -1157635880, now seen corresponding path program 1 times [2021-01-06 10:01:41,195 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:41,195 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [38693270] [2021-01-06 10:01:41,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:41,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:41,557 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 10:01:41,558 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [38693270] [2021-01-06 10:01:41,560 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 10:01:41,560 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-01-06 10:01:41,562 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308361179] [2021-01-06 10:01:41,571 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-01-06 10:01:41,572 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:41,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-01-06 10:01:41,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 10:01:41,603 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 3 states. [2021-01-06 10:01:41,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:41,694 INFO L93 Difference]: Finished difference Result 28 states and 40 transitions. [2021-01-06 10:01:41,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-01-06 10:01:41,698 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2021-01-06 10:01:41,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:41,733 INFO L225 Difference]: With dead ends: 28 [2021-01-06 10:01:41,736 INFO L226 Difference]: Without dead ends: 12 [2021-01-06 10:01:41,749 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 10:01:41,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-01-06 10:01:41,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-01-06 10:01:41,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2021-01-06 10:01:41,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2021-01-06 10:01:41,887 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 9 [2021-01-06 10:01:41,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:41,888 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2021-01-06 10:01:41,888 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-01-06 10:01:41,889 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2021-01-06 10:01:41,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-01-06 10:01:41,889 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:41,890 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:41,890 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-01-06 10:01:41,891 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:41,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:41,893 INFO L82 PathProgramCache]: Analyzing trace with hash 722375763, now seen corresponding path program 1 times [2021-01-06 10:01:41,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:41,893 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109772136] [2021-01-06 10:01:41,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:41,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:41,971 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 10:01:41,972 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109772136] [2021-01-06 10:01:41,973 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [775928477] [2021-01-06 10:01:41,973 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 10:01:42,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:42,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 2 conjunts are in the unsatisfiable core [2021-01-06 10:01:42,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:42,163 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 10:01:42,165 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-01-06 10:01:42,165 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2021-01-06 10:01:42,167 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [471946753] [2021-01-06 10:01:42,169 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-01-06 10:01:42,169 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:42,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-01-06 10:01:42,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-01-06 10:01:42,172 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand 3 states. [2021-01-06 10:01:42,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:42,245 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2021-01-06 10:01:42,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-01-06 10:01:42,247 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2021-01-06 10:01:42,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:42,248 INFO L225 Difference]: With dead ends: 24 [2021-01-06 10:01:42,248 INFO L226 Difference]: Without dead ends: 18 [2021-01-06 10:01:42,250 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 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 10:01:42,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-01-06 10:01:42,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 13. [2021-01-06 10:01:42,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2021-01-06 10:01:42,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2021-01-06 10:01:42,257 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 10 [2021-01-06 10:01:42,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:42,258 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2021-01-06 10:01:42,259 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-01-06 10:01:42,259 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2021-01-06 10:01:42,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-01-06 10:01:42,260 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:42,260 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:42,476 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-01-06 10:01:42,476 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:42,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:42,480 INFO L82 PathProgramCache]: Analyzing trace with hash 970258327, now seen corresponding path program 1 times [2021-01-06 10:01:42,481 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:42,481 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [15076432] [2021-01-06 10:01:42,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:42,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:42,553 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 10:01:42,554 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [15076432] [2021-01-06 10:01:42,554 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1203836605] [2021-01-06 10:01:42,554 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 10:01:42,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:42,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2021-01-06 10:01:42,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:42,705 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 10:01:42,706 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:42,706 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-01-06 10:01:42,707 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468005427] [2021-01-06 10:01:42,708 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-01-06 10:01:42,708 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:42,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-01-06 10:01:42,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-01-06 10:01:42,710 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand 5 states. [2021-01-06 10:01:42,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:42,754 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-01-06 10:01:42,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-01-06 10:01:42,756 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2021-01-06 10:01:42,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:42,757 INFO L225 Difference]: With dead ends: 28 [2021-01-06 10:01:42,757 INFO L226 Difference]: Without dead ends: 19 [2021-01-06 10:01:42,758 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 10:01:42,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-01-06 10:01:42,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 14. [2021-01-06 10:01:42,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2021-01-06 10:01:42,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-01-06 10:01:42,769 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 11 [2021-01-06 10:01:42,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:42,770 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-01-06 10:01:42,770 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-01-06 10:01:42,770 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-01-06 10:01:42,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-01-06 10:01:42,771 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:42,771 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:42,986 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:42,988 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:42,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:42,990 INFO L82 PathProgramCache]: Analyzing trace with hash -519784366, now seen corresponding path program 2 times [2021-01-06 10:01:42,991 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:42,991 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1218441674] [2021-01-06 10:01:42,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:43,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:43,054 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-01-06 10:01:43,054 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1218441674] [2021-01-06 10:01:43,054 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1802934230] [2021-01-06 10:01:43,055 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 10:01:43,123 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 10:01:43,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:43,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 4 conjunts are in the unsatisfiable core [2021-01-06 10:01:43,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:43,184 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 10:01:43,185 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:43,185 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 7 [2021-01-06 10:01:43,185 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857352793] [2021-01-06 10:01:43,186 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-01-06 10:01:43,186 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:43,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-01-06 10:01:43,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2021-01-06 10:01:43,188 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 7 states. [2021-01-06 10:01:43,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:43,273 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2021-01-06 10:01:43,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-01-06 10:01:43,274 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2021-01-06 10:01:43,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:43,275 INFO L225 Difference]: With dead ends: 36 [2021-01-06 10:01:43,275 INFO L226 Difference]: Without dead ends: 27 [2021-01-06 10:01:43,276 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2021-01-06 10:01:43,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-01-06 10:01:43,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 17. [2021-01-06 10:01:43,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2021-01-06 10:01:43,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-01-06 10:01:43,282 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2021-01-06 10:01:43,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:43,283 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-01-06 10:01:43,283 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2021-01-06 10:01:43,283 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-01-06 10:01:43,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-01-06 10:01:43,284 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:43,284 INFO L422 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:43,499 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:43,500 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:43,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:43,502 INFO L82 PathProgramCache]: Analyzing trace with hash -1963781416, now seen corresponding path program 3 times [2021-01-06 10:01:43,502 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:43,503 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343042549] [2021-01-06 10:01:43,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:43,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:43,635 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 10:01:43,636 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343042549] [2021-01-06 10:01:43,637 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1847548959] [2021-01-06 10:01:43,637 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 10:01:43,708 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-01-06 10:01:43,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:43,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2021-01-06 10:01:43,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:43,756 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 10:01:43,756 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:43,756 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-01-06 10:01:43,757 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612927670] [2021-01-06 10:01:43,758 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-01-06 10:01:43,758 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:43,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-01-06 10:01:43,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-01-06 10:01:43,760 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2021-01-06 10:01:43,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:43,823 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2021-01-06 10:01:43,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-01-06 10:01:43,824 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2021-01-06 10:01:43,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:43,826 INFO L225 Difference]: With dead ends: 39 [2021-01-06 10:01:43,826 INFO L226 Difference]: Without dead ends: 33 [2021-01-06 10:01:43,829 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 10:01:43,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-01-06 10:01:43,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 18. [2021-01-06 10:01:43,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2021-01-06 10:01:43,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-01-06 10:01:43,843 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2021-01-06 10:01:43,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:43,844 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-01-06 10:01:43,844 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-01-06 10:01:43,844 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-01-06 10:01:43,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-01-06 10:01:43,845 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:43,845 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:44,059 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:44,061 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:44,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:44,062 INFO L82 PathProgramCache]: Analyzing trace with hash -696235598, now seen corresponding path program 4 times [2021-01-06 10:01:44,062 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:44,063 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1283371715] [2021-01-06 10:01:44,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:44,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:44,189 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-01-06 10:01:44,189 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1283371715] [2021-01-06 10:01:44,190 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1739446944] [2021-01-06 10:01:44,190 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 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 10:01:44,245 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 10:01:44,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:44,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 6 conjunts are in the unsatisfiable core [2021-01-06 10:01:44,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:44,332 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-01-06 10:01:44,333 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:44,333 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 11 [2021-01-06 10:01:44,333 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72042747] [2021-01-06 10:01:44,334 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-01-06 10:01:44,334 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:44,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-01-06 10:01:44,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=56, Unknown=0, NotChecked=0, Total=110 [2021-01-06 10:01:44,335 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 11 states. [2021-01-06 10:01:44,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:44,401 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2021-01-06 10:01:44,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-01-06 10:01:44,401 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2021-01-06 10:01:44,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:44,402 INFO L225 Difference]: With dead ends: 54 [2021-01-06 10:01:44,403 INFO L226 Difference]: Without dead ends: 43 [2021-01-06 10:01:44,403 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=54, Invalid=56, Unknown=0, NotChecked=0, Total=110 [2021-01-06 10:01:44,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-01-06 10:01:44,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 23. [2021-01-06 10:01:44,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2021-01-06 10:01:44,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2021-01-06 10:01:44,409 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 16 [2021-01-06 10:01:44,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:44,409 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2021-01-06 10:01:44,410 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2021-01-06 10:01:44,410 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2021-01-06 10:01:44,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-01-06 10:01:44,410 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:44,411 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:44,623 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-01-06 10:01:44,624 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:44,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:44,625 INFO L82 PathProgramCache]: Analyzing trace with hash 1003861208, now seen corresponding path program 5 times [2021-01-06 10:01:44,625 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:44,626 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [315961955] [2021-01-06 10:01:44,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:44,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:44,718 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-01-06 10:01:44,719 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [315961955] [2021-01-06 10:01:44,719 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [557448588] [2021-01-06 10:01:44,719 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 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 10:01:44,844 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-01-06 10:01:44,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:44,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 10 conjunts are in the unsatisfiable core [2021-01-06 10:01:44,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:44,959 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-01-06 10:01:44,960 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:44,960 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11] total 15 [2021-01-06 10:01:44,960 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911810773] [2021-01-06 10:01:44,961 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-01-06 10:01:44,961 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:44,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-01-06 10:01:44,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=106, Unknown=0, NotChecked=0, Total=210 [2021-01-06 10:01:44,962 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 15 states. [2021-01-06 10:01:45,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:45,051 INFO L93 Difference]: Finished difference Result 65 states and 73 transitions. [2021-01-06 10:01:45,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-01-06 10:01:45,052 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 21 [2021-01-06 10:01:45,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:45,052 INFO L225 Difference]: With dead ends: 65 [2021-01-06 10:01:45,053 INFO L226 Difference]: Without dead ends: 53 [2021-01-06 10:01:45,053 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=104, Invalid=106, Unknown=0, NotChecked=0, Total=210 [2021-01-06 10:01:45,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-01-06 10:01:45,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 28. [2021-01-06 10:01:45,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2021-01-06 10:01:45,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-01-06 10:01:45,059 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 21 [2021-01-06 10:01:45,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:45,059 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-01-06 10:01:45,060 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2021-01-06 10:01:45,060 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-01-06 10:01:45,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-01-06 10:01:45,061 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:45,061 INFO L422 BasicCegarLoop]: trace histogram [12, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:45,281 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:45,282 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:45,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:45,283 INFO L82 PathProgramCache]: Analyzing trace with hash 1992579314, now seen corresponding path program 6 times [2021-01-06 10:01:45,284 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:45,285 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [43720169] [2021-01-06 10:01:45,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:45,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:45,372 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-01-06 10:01:45,372 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [43720169] [2021-01-06 10:01:45,373 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [718217953] [2021-01-06 10:01:45,373 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 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 10:01:45,766 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-01-06 10:01:45,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:45,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 7 conjunts are in the unsatisfiable core [2021-01-06 10:01:45,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:45,815 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-01-06 10:01:45,816 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:45,816 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-01-06 10:01:45,816 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206765109] [2021-01-06 10:01:45,816 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-01-06 10:01:45,817 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:45,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-01-06 10:01:45,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-01-06 10:01:45,818 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 9 states. [2021-01-06 10:01:45,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:45,895 INFO L93 Difference]: Finished difference Result 65 states and 68 transitions. [2021-01-06 10:01:45,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-01-06 10:01:45,895 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2021-01-06 10:01:45,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:45,902 INFO L225 Difference]: With dead ends: 65 [2021-01-06 10:01:45,902 INFO L226 Difference]: Without dead ends: 59 [2021-01-06 10:01:45,904 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 26 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 10:01:45,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-01-06 10:01:45,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 29. [2021-01-06 10:01:45,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2021-01-06 10:01:45,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2021-01-06 10:01:45,919 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 26 [2021-01-06 10:01:45,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:45,920 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2021-01-06 10:01:45,920 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-01-06 10:01:45,920 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2021-01-06 10:01:45,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-01-06 10:01:45,921 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:45,921 INFO L422 BasicCegarLoop]: trace histogram [12, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:46,135 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:46,136 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:46,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:46,142 INFO L82 PathProgramCache]: Analyzing trace with hash 1691862744, now seen corresponding path program 7 times [2021-01-06 10:01:46,142 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:46,142 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1312924506] [2021-01-06 10:01:46,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:46,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:46,280 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-01-06 10:01:46,280 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1312924506] [2021-01-06 10:01:46,283 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [850712688] [2021-01-06 10:01:46,284 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 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 10:01:46,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:46,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 14 conjunts are in the unsatisfiable core [2021-01-06 10:01:46,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:46,533 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-01-06 10:01:46,533 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:46,534 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 15] total 20 [2021-01-06 10:01:46,534 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532005636] [2021-01-06 10:01:46,535 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-01-06 10:01:46,535 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:46,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-01-06 10:01:46,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=191, Unknown=0, NotChecked=0, Total=380 [2021-01-06 10:01:46,536 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 20 states. [2021-01-06 10:01:46,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:46,675 INFO L93 Difference]: Finished difference Result 84 states and 93 transitions. [2021-01-06 10:01:46,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-01-06 10:01:46,676 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2021-01-06 10:01:46,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:46,677 INFO L225 Difference]: With dead ends: 84 [2021-01-06 10:01:46,677 INFO L226 Difference]: Without dead ends: 70 [2021-01-06 10:01:46,677 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=189, Invalid=191, Unknown=0, NotChecked=0, Total=380 [2021-01-06 10:01:46,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-01-06 10:01:46,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 35. [2021-01-06 10:01:46,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2021-01-06 10:01:46,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2021-01-06 10:01:46,683 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 27 [2021-01-06 10:01:46,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:46,684 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2021-01-06 10:01:46,684 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2021-01-06 10:01:46,684 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2021-01-06 10:01:46,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-01-06 10:01:46,685 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:46,685 INFO L422 BasicCegarLoop]: trace histogram [17, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:46,899 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-01-06 10:01:46,900 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:46,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:46,901 INFO L82 PathProgramCache]: Analyzing trace with hash 1846683927, now seen corresponding path program 8 times [2021-01-06 10:01:46,901 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:46,902 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1347104953] [2021-01-06 10:01:46,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:46,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:47,058 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-01-06 10:01:47,059 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1347104953] [2021-01-06 10:01:47,059 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [449249268] [2021-01-06 10:01:47,059 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 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 10:01:47,139 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 10:01:47,140 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:47,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 19 conjunts are in the unsatisfiable core [2021-01-06 10:01:47,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:47,349 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-01-06 10:01:47,349 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:47,350 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 20] total 25 [2021-01-06 10:01:47,350 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [986300424] [2021-01-06 10:01:47,353 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-01-06 10:01:47,353 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:47,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-01-06 10:01:47,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=299, Invalid=301, Unknown=0, NotChecked=0, Total=600 [2021-01-06 10:01:47,359 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 25 states. [2021-01-06 10:01:47,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:47,530 INFO L93 Difference]: Finished difference Result 96 states and 105 transitions. [2021-01-06 10:01:47,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-01-06 10:01:47,530 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 33 [2021-01-06 10:01:47,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:47,531 INFO L225 Difference]: With dead ends: 96 [2021-01-06 10:01:47,531 INFO L226 Difference]: Without dead ends: 81 [2021-01-06 10:01:47,532 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=299, Invalid=301, Unknown=0, NotChecked=0, Total=600 [2021-01-06 10:01:47,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-01-06 10:01:47,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 41. [2021-01-06 10:01:47,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2021-01-06 10:01:47,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2021-01-06 10:01:47,539 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 33 [2021-01-06 10:01:47,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:47,540 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2021-01-06 10:01:47,540 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2021-01-06 10:01:47,540 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2021-01-06 10:01:47,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-01-06 10:01:47,541 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:47,541 INFO L422 BasicCegarLoop]: trace histogram [22, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:47,754 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:47,755 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:47,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:47,756 INFO L82 PathProgramCache]: Analyzing trace with hash 1499410168, now seen corresponding path program 9 times [2021-01-06 10:01:47,756 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:47,757 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2025250863] [2021-01-06 10:01:47,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:47,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:47,924 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-01-06 10:01:47,924 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2025250863] [2021-01-06 10:01:47,925 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [73196531] [2021-01-06 10:01:47,925 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 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 10:01:48,168 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-01-06 10:01:48,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:48,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 10 conjunts are in the unsatisfiable core [2021-01-06 10:01:48,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:48,238 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-01-06 10:01:48,239 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:48,239 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-01-06 10:01:48,239 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139405380] [2021-01-06 10:01:48,239 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-01-06 10:01:48,240 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:48,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-01-06 10:01:48,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2021-01-06 10:01:48,241 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 12 states. [2021-01-06 10:01:48,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:48,341 INFO L93 Difference]: Finished difference Result 93 states and 96 transitions. [2021-01-06 10:01:48,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-01-06 10:01:48,342 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2021-01-06 10:01:48,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:48,343 INFO L225 Difference]: With dead ends: 93 [2021-01-06 10:01:48,343 INFO L226 Difference]: Without dead ends: 87 [2021-01-06 10:01:48,343 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 39 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 10:01:48,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-01-06 10:01:48,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 42. [2021-01-06 10:01:48,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2021-01-06 10:01:48,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2021-01-06 10:01:48,350 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2021-01-06 10:01:48,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:48,350 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2021-01-06 10:01:48,351 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2021-01-06 10:01:48,351 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2021-01-06 10:01:48,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-01-06 10:01:48,352 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:48,352 INFO L422 BasicCegarLoop]: trace histogram [22, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:48,567 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:01:48,568 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:48,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:48,569 INFO L82 PathProgramCache]: Analyzing trace with hash -711478894, now seen corresponding path program 10 times [2021-01-06 10:01:48,569 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:48,570 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1868200696] [2021-01-06 10:01:48,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:48,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:48,704 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-01-06 10:01:48,704 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1868200696] [2021-01-06 10:01:48,704 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [790928708] [2021-01-06 10:01:48,704 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 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 10:01:48,788 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 10:01:48,788 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:01:48,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 24 conjunts are in the unsatisfiable core [2021-01-06 10:01:48,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:01:49,061 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-01-06 10:01:49,062 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:01:49,062 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 25] total 31 [2021-01-06 10:01:49,062 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612253706] [2021-01-06 10:01:49,063 INFO L461 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-01-06 10:01:49,063 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:01:49,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-01-06 10:01:49,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=466, Unknown=0, NotChecked=0, Total=930 [2021-01-06 10:01:49,065 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 31 states. [2021-01-06 10:01:49,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:01:49,227 INFO L93 Difference]: Finished difference Result 116 states and 126 transitions. [2021-01-06 10:01:49,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-01-06 10:01:49,228 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 40 [2021-01-06 10:01:49,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:01:49,229 INFO L225 Difference]: With dead ends: 116 [2021-01-06 10:01:49,229 INFO L226 Difference]: Without dead ends: 99 [2021-01-06 10:01:49,230 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 525 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=464, Invalid=466, Unknown=0, NotChecked=0, Total=930 [2021-01-06 10:01:49,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-01-06 10:01:49,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 49. [2021-01-06 10:01:49,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2021-01-06 10:01:49,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2021-01-06 10:01:49,238 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 40 [2021-01-06 10:01:49,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:01:49,238 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2021-01-06 10:01:49,238 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2021-01-06 10:01:49,238 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2021-01-06 10:01:49,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-01-06 10:01:49,239 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:01:49,240 INFO L422 BasicCegarLoop]: trace histogram [28, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:01:49,454 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-01-06 10:01:49,455 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:01:49,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:01:49,456 INFO L82 PathProgramCache]: Analyzing trace with hash -789755816, now seen corresponding path program 11 times [2021-01-06 10:01:49,456 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:01:49,456 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1938395752] [2021-01-06 10:01:49,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:01:49,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:01:49,610 INFO L134 CoverageAnalysis]: Checked inductivity of 461 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2021-01-06 10:01:49,610 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1938395752] [2021-01-06 10:01:49,610 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1885914522] [2021-01-06 10:01:49,611 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 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 10:02:34,956 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 15 check-sat command(s) [2021-01-06 10:02:34,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:02:35,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 12 conjunts are in the unsatisfiable core [2021-01-06 10:02:35,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:02:35,111 INFO L134 CoverageAnalysis]: Checked inductivity of 461 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2021-01-06 10:02:35,111 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:02:35,111 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2021-01-06 10:02:35,112 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324282907] [2021-01-06 10:02:35,112 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-01-06 10:02:35,112 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:02:35,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-01-06 10:02:35,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2021-01-06 10:02:35,113 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand 14 states. [2021-01-06 10:02:35,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:02:35,226 INFO L93 Difference]: Finished difference Result 111 states and 114 transitions. [2021-01-06 10:02:35,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-01-06 10:02:35,226 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 47 [2021-01-06 10:02:35,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:02:35,227 INFO L225 Difference]: With dead ends: 111 [2021-01-06 10:02:35,228 INFO L226 Difference]: Without dead ends: 105 [2021-01-06 10:02:35,228 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2021-01-06 10:02:35,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-01-06 10:02:35,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 50. [2021-01-06 10:02:35,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2021-01-06 10:02:35,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2021-01-06 10:02:35,237 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2021-01-06 10:02:35,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:02:35,237 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2021-01-06 10:02:35,237 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2021-01-06 10:02:35,237 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2021-01-06 10:02:35,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-01-06 10:02:35,238 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:02:35,238 INFO L422 BasicCegarLoop]: trace histogram [28, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:02:35,448 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-01-06 10:02:35,449 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:02:35,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:02:35,450 INFO L82 PathProgramCache]: Analyzing trace with hash 1338819634, now seen corresponding path program 12 times [2021-01-06 10:02:35,450 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:02:35,450 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264181188] [2021-01-06 10:02:35,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:02:35,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:02:35,648 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2021-01-06 10:02:35,648 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1264181188] [2021-01-06 10:02:35,649 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [120141974] [2021-01-06 10:02:35,649 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 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 10:02:52,929 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-01-06 10:02:52,930 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:02:52,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 13 conjunts are in the unsatisfiable core [2021-01-06 10:02:52,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:02:53,039 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2021-01-06 10:02:53,040 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:02:53,040 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2021-01-06 10:02:53,041 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094882518] [2021-01-06 10:02:53,043 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-01-06 10:02:53,044 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:02:53,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-01-06 10:02:53,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2021-01-06 10:02:53,045 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 15 states. [2021-01-06 10:02:53,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:02:53,166 INFO L93 Difference]: Finished difference Result 117 states and 120 transitions. [2021-01-06 10:02:53,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-01-06 10:02:53,167 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 48 [2021-01-06 10:02:53,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:02:53,170 INFO L225 Difference]: With dead ends: 117 [2021-01-06 10:02:53,170 INFO L226 Difference]: Without dead ends: 111 [2021-01-06 10:02:53,171 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 48 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 10:02:53,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-01-06 10:02:53,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 51. [2021-01-06 10:02:53,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2021-01-06 10:02:53,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2021-01-06 10:02:53,191 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 48 [2021-01-06 10:02:53,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:02:53,191 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2021-01-06 10:02:53,191 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2021-01-06 10:02:53,191 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2021-01-06 10:02:53,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-01-06 10:02:53,192 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:02:53,192 INFO L422 BasicCegarLoop]: trace histogram [28, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:02:53,393 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-01-06 10:02:53,393 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:02:53,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:02:53,394 INFO L82 PathProgramCache]: Analyzing trace with hash -1394818152, now seen corresponding path program 13 times [2021-01-06 10:02:53,394 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:02:53,394 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [679356890] [2021-01-06 10:02:53,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:02:53,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:02:53,601 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2021-01-06 10:02:53,601 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [679356890] [2021-01-06 10:02:53,602 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [189706234] [2021-01-06 10:02:53,602 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 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 10:02:53,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:02:53,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 30 conjunts are in the unsatisfiable core [2021-01-06 10:02:53,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:02:54,050 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-01-06 10:02:54,050 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:02:54,051 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 31] total 39 [2021-01-06 10:02:54,051 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446354797] [2021-01-06 10:02:54,051 INFO L461 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-01-06 10:02:54,051 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:02:54,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-01-06 10:02:54,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=740, Invalid=742, Unknown=0, NotChecked=0, Total=1482 [2021-01-06 10:02:54,053 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand 39 states. [2021-01-06 10:02:54,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:02:54,291 INFO L93 Difference]: Finished difference Result 145 states and 157 transitions. [2021-01-06 10:02:54,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-01-06 10:02:54,292 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 49 [2021-01-06 10:02:54,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:02:54,293 INFO L225 Difference]: With dead ends: 145 [2021-01-06 10:02:54,293 INFO L226 Difference]: Without dead ends: 125 [2021-01-06 10:02:54,294 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 901 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=740, Invalid=742, Unknown=0, NotChecked=0, Total=1482 [2021-01-06 10:02:54,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-01-06 10:02:54,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 60. [2021-01-06 10:02:54,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2021-01-06 10:02:54,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2021-01-06 10:02:54,301 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 49 [2021-01-06 10:02:54,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:02:54,301 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2021-01-06 10:02:54,301 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2021-01-06 10:02:54,301 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2021-01-06 10:02:54,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-01-06 10:02:54,302 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:02:54,302 INFO L422 BasicCegarLoop]: trace histogram [36, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:02:54,516 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 10:02:54,517 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:02:54,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:02:54,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1278358386, now seen corresponding path program 14 times [2021-01-06 10:02:54,518 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:02:54,519 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [239126764] [2021-01-06 10:02:54,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:02:54,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:02:54,739 INFO L134 CoverageAnalysis]: Checked inductivity of 757 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2021-01-06 10:02:54,739 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [239126764] [2021-01-06 10:02:54,740 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1218169933] [2021-01-06 10:02:54,740 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 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 10:02:54,844 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 10:02:54,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:02:54,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 38 conjunts are in the unsatisfiable core [2021-01-06 10:02:54,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:02:55,259 INFO L134 CoverageAnalysis]: Checked inductivity of 757 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-01-06 10:02:55,259 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:02:55,259 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 39] total 46 [2021-01-06 10:02:55,260 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1926089749] [2021-01-06 10:02:55,260 INFO L461 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-01-06 10:02:55,260 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:02:55,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-01-06 10:02:55,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1034, Invalid=1036, Unknown=0, NotChecked=0, Total=2070 [2021-01-06 10:02:55,262 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 46 states. [2021-01-06 10:02:55,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:02:55,541 INFO L93 Difference]: Finished difference Result 159 states and 170 transitions. [2021-01-06 10:02:55,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-01-06 10:02:55,542 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 58 [2021-01-06 10:02:55,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:02:55,543 INFO L225 Difference]: With dead ends: 159 [2021-01-06 10:02:55,543 INFO L226 Difference]: Without dead ends: 138 [2021-01-06 10:02:55,545 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1321 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=1034, Invalid=1036, Unknown=0, NotChecked=0, Total=2070 [2021-01-06 10:02:55,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-01-06 10:02:55,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 68. [2021-01-06 10:02:55,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2021-01-06 10:02:55,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2021-01-06 10:02:55,552 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 58 [2021-01-06 10:02:55,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:02:55,552 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2021-01-06 10:02:55,552 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2021-01-06 10:02:55,552 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2021-01-06 10:02:55,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-01-06 10:02:55,553 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:02:55,553 INFO L422 BasicCegarLoop]: trace histogram [43, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:02:55,766 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-01-06 10:02:55,767 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:02:55,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:02:55,768 INFO L82 PathProgramCache]: Analyzing trace with hash -473710349, now seen corresponding path program 15 times [2021-01-06 10:02:55,768 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:02:55,768 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916633803] [2021-01-06 10:02:55,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:02:55,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:02:55,991 INFO L134 CoverageAnalysis]: Checked inductivity of 1051 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2021-01-06 10:02:55,991 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916633803] [2021-01-06 10:02:55,991 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [722713784] [2021-01-06 10:02:55,991 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 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 10:02:59,420 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-01-06 10:02:59,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:02:59,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 16 conjunts are in the unsatisfiable core [2021-01-06 10:02:59,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:02:59,516 INFO L134 CoverageAnalysis]: Checked inductivity of 1051 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2021-01-06 10:02:59,516 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:02:59,517 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2021-01-06 10:02:59,517 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288936643] [2021-01-06 10:02:59,517 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-01-06 10:02:59,517 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:02:59,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-01-06 10:02:59,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2021-01-06 10:02:59,518 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 18 states. [2021-01-06 10:02:59,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:02:59,661 INFO L93 Difference]: Finished difference Result 150 states and 153 transitions. [2021-01-06 10:02:59,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-01-06 10:02:59,661 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 66 [2021-01-06 10:02:59,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:02:59,662 INFO L225 Difference]: With dead ends: 150 [2021-01-06 10:02:59,662 INFO L226 Difference]: Without dead ends: 144 [2021-01-06 10:02:59,663 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2021-01-06 10:02:59,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-01-06 10:02:59,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 69. [2021-01-06 10:02:59,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2021-01-06 10:02:59,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2021-01-06 10:02:59,670 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 66 [2021-01-06 10:02:59,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:02:59,670 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2021-01-06 10:02:59,670 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2021-01-06 10:02:59,670 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2021-01-06 10:02:59,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-01-06 10:02:59,671 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:02:59,671 INFO L422 BasicCegarLoop]: trace histogram [43, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:02:59,884 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-01-06 10:02:59,885 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:02:59,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:02:59,886 INFO L82 PathProgramCache]: Analyzing trace with hash -1748672777, now seen corresponding path program 16 times [2021-01-06 10:02:59,886 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:02:59,886 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [983429817] [2021-01-06 10:02:59,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:02:59,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:03:00,165 INFO L134 CoverageAnalysis]: Checked inductivity of 1066 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2021-01-06 10:03:00,165 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [983429817] [2021-01-06 10:03:00,165 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [745066953] [2021-01-06 10:03:00,165 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 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 10:03:00,284 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 10:03:00,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 10:03:00,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 411 conjuncts, 45 conjunts are in the unsatisfiable core [2021-01-06 10:03:00,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 10:03:00,802 INFO L134 CoverageAnalysis]: Checked inductivity of 1066 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-01-06 10:03:00,803 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 10:03:00,803 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 46] total 54 [2021-01-06 10:03:00,803 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905636918] [2021-01-06 10:03:00,804 INFO L461 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-01-06 10:03:00,804 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 10:03:00,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-01-06 10:03:00,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1430, Invalid=1432, Unknown=0, NotChecked=0, Total=2862 [2021-01-06 10:03:00,806 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand 54 states. [2021-01-06 10:03:01,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 10:03:01,136 INFO L93 Difference]: Finished difference Result 181 states and 193 transitions. [2021-01-06 10:03:01,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-01-06 10:03:01,137 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 67 [2021-01-06 10:03:01,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 10:03:01,139 INFO L225 Difference]: With dead ends: 181 [2021-01-06 10:03:01,139 INFO L226 Difference]: Without dead ends: 158 [2021-01-06 10:03:01,141 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1897 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=1430, Invalid=1432, Unknown=0, NotChecked=0, Total=2862 [2021-01-06 10:03:01,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-01-06 10:03:01,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 78. [2021-01-06 10:03:01,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2021-01-06 10:03:01,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2021-01-06 10:03:01,157 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 67 [2021-01-06 10:03:01,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 10:03:01,158 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2021-01-06 10:03:01,158 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2021-01-06 10:03:01,159 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2021-01-06 10:03:01,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-01-06 10:03:01,161 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 10:03:01,161 INFO L422 BasicCegarLoop]: trace histogram [51, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 10:03:01,375 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-01-06 10:03:01,375 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 10:03:01,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 10:03:01,376 INFO L82 PathProgramCache]: Analyzing trace with hash 703685619, now seen corresponding path program 17 times [2021-01-06 10:03:01,376 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 10:03:01,377 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [452526835] [2021-01-06 10:03:01,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 10:03:01,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 10:03:01,656 INFO L134 CoverageAnalysis]: Checked inductivity of 1462 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2021-01-06 10:03:01,656 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [452526835] [2021-01-06 10:03:01,656 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1985223964] [2021-01-06 10:03:01,656 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 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