/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/loop-simple/nested_5.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-dcfa08f [2020-12-23 07:14:44,223 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-23 07:14:44,227 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-23 07:14:44,288 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-23 07:14:44,288 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-23 07:14:44,293 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-23 07:14:44,297 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-23 07:14:44,303 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-23 07:14:44,307 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-23 07:14:44,313 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-23 07:14:44,317 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-23 07:14:44,319 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-23 07:14:44,319 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-23 07:14:44,323 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-23 07:14:44,325 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-23 07:14:44,327 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-23 07:14:44,329 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-23 07:14:44,333 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-23 07:14:44,342 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-23 07:14:44,349 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-23 07:14:44,352 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-23 07:14:44,354 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-23 07:14:44,356 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-23 07:14:44,359 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-23 07:14:44,368 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-23 07:14:44,376 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-23 07:14:44,377 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-23 07:14:44,380 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-23 07:14:44,381 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-23 07:14:44,382 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-23 07:14:44,382 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-23 07:14:44,383 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-23 07:14:44,391 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-23 07:14:44,391 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-23 07:14:44,392 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-23 07:14:44,393 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-23 07:14:44,394 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-23 07:14:44,448 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-23 07:14:44,448 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-23 07:14:44,453 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-23 07:14:44,454 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-23 07:14:44,454 INFO L138 SettingsManager]: * Use SBE=true [2020-12-23 07:14:44,454 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-23 07:14:44,454 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-23 07:14:44,455 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-23 07:14:44,455 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-23 07:14:44,455 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-23 07:14:44,456 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-23 07:14:44,457 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-23 07:14:44,457 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-23 07:14:44,458 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-23 07:14:44,458 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-23 07:14:44,458 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-23 07:14:44,458 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-23 07:14:44,458 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 07:14:44,459 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-23 07:14:44,459 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-23 07:14:44,459 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-23 07:14:44,459 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-23 07:14:44,460 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-23 07:14:44,460 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-23 07:14:44,460 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-23 07:14:44,460 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-23 07:14:44,923 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-23 07:14:44,968 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-23 07:14:44,971 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-23 07:14:44,973 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-23 07:14:44,974 INFO L275 PluginConnector]: CDTParser initialized [2020-12-23 07:14:44,975 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-simple/nested_5.c [2020-12-23 07:14:45,077 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/6037063c0/3de330b10b8b47728ec4f61e308f7913/FLAG1101bbb69 [2020-12-23 07:14:45,679 INFO L306 CDTParser]: Found 1 translation units. [2020-12-23 07:14:45,680 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loop-simple/nested_5.c [2020-12-23 07:14:45,689 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/6037063c0/3de330b10b8b47728ec4f61e308f7913/FLAG1101bbb69 [2020-12-23 07:14:46,051 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/6037063c0/3de330b10b8b47728ec4f61e308f7913 [2020-12-23 07:14:46,059 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-23 07:14:46,061 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-23 07:14:46,066 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-23 07:14:46,066 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-23 07:14:46,070 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-23 07:14:46,071 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 07:14:46" (1/1) ... [2020-12-23 07:14:46,074 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6a296ef7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:46, skipping insertion in model container [2020-12-23 07:14:46,074 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 07:14:46" (1/1) ... [2020-12-23 07:14:46,084 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-23 07:14:46,106 INFO L178 MainTranslator]: Built tables and reachable declarations left hand side expression in assignment: lhs: VariableLHS[~a~0,] left hand side expression in assignment: lhs: VariableLHS[~b~0,] left hand side expression in assignment: lhs: VariableLHS[~c~0,] left hand side expression in assignment: lhs: VariableLHS[~d~0,] left hand side expression in assignment: lhs: VariableLHS[~e~0,] [2020-12-23 07:14:46,326 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loop-simple/nested_5.c[899,912] [2020-12-23 07:14:46,332 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 07:14:46,343 INFO L203 MainTranslator]: Completed pre-run left hand side expression in assignment: lhs: VariableLHS[~a~0,] left hand side expression in assignment: lhs: VariableLHS[~b~0,] left hand side expression in assignment: lhs: VariableLHS[~c~0,] left hand side expression in assignment: lhs: VariableLHS[~d~0,] left hand side expression in assignment: lhs: VariableLHS[~e~0,] [2020-12-23 07:14:46,364 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loop-simple/nested_5.c[899,912] [2020-12-23 07:14:46,365 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 07:14:46,382 INFO L208 MainTranslator]: Completed translation [2020-12-23 07:14:46,382 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:46 WrapperNode [2020-12-23 07:14:46,382 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-23 07:14:46,384 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-23 07:14:46,384 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-23 07:14:46,384 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-23 07:14:46,394 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:46" (1/1) ... [2020-12-23 07:14:46,402 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:46" (1/1) ... [2020-12-23 07:14:46,424 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-23 07:14:46,426 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-23 07:14:46,426 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-23 07:14:46,426 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-23 07:14:46,436 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:46" (1/1) ... [2020-12-23 07:14:46,437 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:46" (1/1) ... [2020-12-23 07:14:46,438 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:46" (1/1) ... [2020-12-23 07:14:46,439 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:46" (1/1) ... [2020-12-23 07:14:46,443 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:46" (1/1) ... [2020-12-23 07:14:46,449 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:46" (1/1) ... [2020-12-23 07:14:46,450 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:46" (1/1) ... [2020-12-23 07:14:46,453 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-23 07:14:46,454 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-23 07:14:46,454 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-23 07:14:46,454 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-23 07:14:46,455 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:46" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 07:14:46,553 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-23 07:14:46,553 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-23 07:14:46,553 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-23 07:14:46,554 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-23 07:14:46,915 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-23 07:14:46,916 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2020-12-23 07:14:46,921 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 07:14:46 BoogieIcfgContainer [2020-12-23 07:14:46,921 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-23 07:14:46,923 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-23 07:14:46,923 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-23 07:14:46,935 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-23 07:14:46,935 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.12 07:14:46" (1/3) ... [2020-12-23 07:14:46,939 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ee49760 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 07:14:46, skipping insertion in model container [2020-12-23 07:14:46,939 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 07:14:46" (2/3) ... [2020-12-23 07:14:46,939 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ee49760 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 07:14:46, skipping insertion in model container [2020-12-23 07:14:46,940 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 07:14:46" (3/3) ... [2020-12-23 07:14:46,944 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_5.c [2020-12-23 07:14:46,961 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-23 07:14:46,977 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-23 07:14:47,033 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-23 07:14:47,088 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-23 07:14:47,089 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-23 07:14:47,089 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-23 07:14:47,089 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-23 07:14:47,089 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-23 07:14:47,089 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-23 07:14:47,090 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-23 07:14:47,090 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-23 07:14:47,109 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-12-23 07:14:47,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-12-23 07:14:47,116 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:47,117 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2020-12-23 07:14:47,118 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:47,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:47,127 INFO L82 PathProgramCache]: Analyzing trace with hash 28698534, now seen corresponding path program 1 times [2020-12-23 07:14:47,141 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:47,141 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965201375] [2020-12-23 07:14:47,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:47,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:47,400 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:14:47,401 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1965201375] [2020-12-23 07:14:47,402 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 07:14:47,403 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-23 07:14:47,404 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033620660] [2020-12-23 07:14:47,410 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 07:14:47,410 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:47,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 07:14:47,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 07:14:47,432 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-12-23 07:14:47,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:47,475 INFO L93 Difference]: Finished difference Result 46 states and 76 transitions. [2020-12-23 07:14:47,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 07:14:47,477 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 5 [2020-12-23 07:14:47,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:47,489 INFO L225 Difference]: With dead ends: 46 [2020-12-23 07:14:47,490 INFO L226 Difference]: Without dead ends: 25 [2020-12-23 07:14:47,494 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 07:14:47,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-12-23 07:14:47,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 16. [2020-12-23 07:14:47,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-12-23 07:14:47,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2020-12-23 07:14:47,538 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 5 [2020-12-23 07:14:47,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:47,538 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2020-12-23 07:14:47,539 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 07:14:47,539 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2020-12-23 07:14:47,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-23 07:14:47,540 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:47,540 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 07:14:47,540 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-23 07:14:47,540 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:47,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:47,542 INFO L82 PathProgramCache]: Analyzing trace with hash 270418006, now seen corresponding path program 1 times [2020-12-23 07:14:47,542 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:47,542 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948331665] [2020-12-23 07:14:47,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:47,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:47,584 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:14:47,584 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1948331665] [2020-12-23 07:14:47,584 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 07:14:47,585 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-23 07:14:47,585 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436760984] [2020-12-23 07:14:47,587 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 07:14:47,587 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:47,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 07:14:47,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 07:14:47,589 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand 3 states. [2020-12-23 07:14:47,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:47,608 INFO L93 Difference]: Finished difference Result 37 states and 49 transitions. [2020-12-23 07:14:47,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 07:14:47,609 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 8 [2020-12-23 07:14:47,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:47,610 INFO L225 Difference]: With dead ends: 37 [2020-12-23 07:14:47,610 INFO L226 Difference]: Without dead ends: 24 [2020-12-23 07:14:47,612 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 07:14:47,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-12-23 07:14:47,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 17. [2020-12-23 07:14:47,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-23 07:14:47,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2020-12-23 07:14:47,617 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 8 [2020-12-23 07:14:47,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:47,617 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2020-12-23 07:14:47,617 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 07:14:47,618 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2020-12-23 07:14:47,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-23 07:14:47,618 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:47,619 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 07:14:47,619 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-23 07:14:47,619 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:47,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:47,620 INFO L82 PathProgramCache]: Analyzing trace with hash 1592253138, now seen corresponding path program 1 times [2020-12-23 07:14:47,620 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:47,621 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1126949184] [2020-12-23 07:14:47,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:47,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:47,660 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:14:47,660 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1126949184] [2020-12-23 07:14:47,661 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 07:14:47,661 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-23 07:14:47,661 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525614335] [2020-12-23 07:14:47,662 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 07:14:47,662 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:47,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 07:14:47,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 07:14:47,663 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand 3 states. [2020-12-23 07:14:47,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:47,680 INFO L93 Difference]: Finished difference Result 37 states and 48 transitions. [2020-12-23 07:14:47,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 07:14:47,681 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2020-12-23 07:14:47,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:47,681 INFO L225 Difference]: With dead ends: 37 [2020-12-23 07:14:47,682 INFO L226 Difference]: Without dead ends: 23 [2020-12-23 07:14:47,682 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 07:14:47,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-12-23 07:14:47,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 18. [2020-12-23 07:14:47,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-23 07:14:47,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2020-12-23 07:14:47,688 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 11 [2020-12-23 07:14:47,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:47,688 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2020-12-23 07:14:47,688 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 07:14:47,688 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2020-12-23 07:14:47,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-12-23 07:14:47,689 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:47,689 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 07:14:47,689 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-12-23 07:14:47,690 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:47,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:47,691 INFO L82 PathProgramCache]: Analyzing trace with hash -1010250086, now seen corresponding path program 1 times [2020-12-23 07:14:47,691 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:47,691 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1204684830] [2020-12-23 07:14:47,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:47,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:47,761 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:14:47,762 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1204684830] [2020-12-23 07:14:47,762 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 07:14:47,762 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-23 07:14:47,763 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89976256] [2020-12-23 07:14:47,766 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 07:14:47,767 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:47,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 07:14:47,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 07:14:47,768 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand 3 states. [2020-12-23 07:14:47,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:47,800 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2020-12-23 07:14:47,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 07:14:47,803 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-12-23 07:14:47,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:47,804 INFO L225 Difference]: With dead ends: 37 [2020-12-23 07:14:47,804 INFO L226 Difference]: Without dead ends: 22 [2020-12-23 07:14:47,805 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 07:14:47,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-12-23 07:14:47,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 19. [2020-12-23 07:14:47,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-23 07:14:47,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2020-12-23 07:14:47,814 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 14 [2020-12-23 07:14:47,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:47,815 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2020-12-23 07:14:47,816 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 07:14:47,816 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2020-12-23 07:14:47,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-23 07:14:47,816 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:47,817 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 07:14:47,818 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-12-23 07:14:47,818 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:47,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:47,819 INFO L82 PathProgramCache]: Analyzing trace with hash 884246574, now seen corresponding path program 1 times [2020-12-23 07:14:47,819 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:47,820 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197392741] [2020-12-23 07:14:47,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:47,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:47,931 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:14:47,932 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197392741] [2020-12-23 07:14:47,932 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 07:14:47,933 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-23 07:14:47,933 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948357239] [2020-12-23 07:14:47,933 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 07:14:47,934 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:47,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 07:14:47,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 07:14:47,935 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand 3 states. [2020-12-23 07:14:47,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:47,951 INFO L93 Difference]: Finished difference Result 37 states and 46 transitions. [2020-12-23 07:14:47,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 07:14:47,952 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-12-23 07:14:47,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:47,953 INFO L225 Difference]: With dead ends: 37 [2020-12-23 07:14:47,953 INFO L226 Difference]: Without dead ends: 21 [2020-12-23 07:14:47,953 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 07:14:47,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-12-23 07:14:47,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2020-12-23 07:14:47,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-23 07:14:47,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2020-12-23 07:14:47,958 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 17 [2020-12-23 07:14:47,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:47,959 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2020-12-23 07:14:47,959 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 07:14:47,959 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2020-12-23 07:14:47,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-12-23 07:14:47,960 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:47,960 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 07:14:47,960 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-12-23 07:14:47,960 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:47,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:47,961 INFO L82 PathProgramCache]: Analyzing trace with hash 291300972, now seen corresponding path program 1 times [2020-12-23 07:14:47,961 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:47,962 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533029636] [2020-12-23 07:14:47,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:47,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:48,036 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:14:48,036 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1533029636] [2020-12-23 07:14:48,037 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [21263214] [2020-12-23 07:14:48,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:14:48,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:48,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-23 07:14:48,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:14:48,192 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:14:48,193 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:14:48,193 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-23 07:14:48,194 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852699847] [2020-12-23 07:14:48,194 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-23 07:14:48,194 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:48,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-23 07:14:48,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-23 07:14:48,196 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand 5 states. [2020-12-23 07:14:48,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:48,221 INFO L93 Difference]: Finished difference Result 40 states and 49 transitions. [2020-12-23 07:14:48,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 07:14:48,222 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-12-23 07:14:48,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:48,222 INFO L225 Difference]: With dead ends: 40 [2020-12-23 07:14:48,222 INFO L226 Difference]: Without dead ends: 23 [2020-12-23 07:14:48,223 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-23 07:14:48,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-12-23 07:14:48,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2020-12-23 07:14:48,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-12-23 07:14:48,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-12-23 07:14:48,228 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 19 [2020-12-23 07:14:48,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:48,228 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-12-23 07:14:48,229 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-23 07:14:48,229 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-12-23 07:14:48,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-23 07:14:48,229 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:48,230 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 07:14:48,444 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-23 07:14:48,445 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:48,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:48,447 INFO L82 PathProgramCache]: Analyzing trace with hash 1701227818, now seen corresponding path program 2 times [2020-12-23 07:14:48,447 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:48,448 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255275066] [2020-12-23 07:14:48,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:48,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:48,518 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-23 07:14:48,518 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255275066] [2020-12-23 07:14:48,519 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [664903242] [2020-12-23 07:14:48,519 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:14:48,580 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 07:14:48,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:14:48,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-23 07:14:48,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:14:48,631 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 07:14:48,632 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:14:48,632 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 7 [2020-12-23 07:14:48,632 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248061114] [2020-12-23 07:14:48,633 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-23 07:14:48,633 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:48,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-23 07:14:48,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-12-23 07:14:48,634 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 7 states. [2020-12-23 07:14:48,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:48,796 INFO L93 Difference]: Finished difference Result 63 states and 77 transitions. [2020-12-23 07:14:48,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-23 07:14:48,798 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-12-23 07:14:48,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:48,800 INFO L225 Difference]: With dead ends: 63 [2020-12-23 07:14:48,800 INFO L226 Difference]: Without dead ends: 44 [2020-12-23 07:14:48,801 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2020-12-23 07:14:48,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-12-23 07:14:48,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 33. [2020-12-23 07:14:48,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-12-23 07:14:48,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2020-12-23 07:14:48,815 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 21 [2020-12-23 07:14:48,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:48,816 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2020-12-23 07:14:48,816 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-23 07:14:48,816 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2020-12-23 07:14:48,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-12-23 07:14:48,817 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:48,818 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 07:14:49,018 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:14:49,019 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:49,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:49,020 INFO L82 PathProgramCache]: Analyzing trace with hash -291735974, now seen corresponding path program 3 times [2020-12-23 07:14:49,021 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:49,021 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [578989149] [2020-12-23 07:14:49,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:49,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:49,108 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2020-12-23 07:14:49,109 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [578989149] [2020-12-23 07:14:49,109 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1142363508] [2020-12-23 07:14:49,110 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:14:49,162 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-12-23 07:14:49,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:14:49,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-23 07:14:49,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:14:49,217 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-12-23 07:14:49,218 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:14:49,218 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-12-23 07:14:49,218 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182957113] [2020-12-23 07:14:49,219 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 07:14:49,219 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:49,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 07:14:49,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-12-23 07:14:49,220 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand 6 states. [2020-12-23 07:14:49,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:49,314 INFO L93 Difference]: Finished difference Result 239 states and 281 transitions. [2020-12-23 07:14:49,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-23 07:14:49,315 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 32 [2020-12-23 07:14:49,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:49,318 INFO L225 Difference]: With dead ends: 239 [2020-12-23 07:14:49,319 INFO L226 Difference]: Without dead ends: 209 [2020-12-23 07:14:49,322 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2020-12-23 07:14:49,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-12-23 07:14:49,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 102. [2020-12-23 07:14:49,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-12-23 07:14:49,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 118 transitions. [2020-12-23 07:14:49,344 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 118 transitions. Word has length 32 [2020-12-23 07:14:49,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:49,345 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 118 transitions. [2020-12-23 07:14:49,345 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 07:14:49,345 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 118 transitions. [2020-12-23 07:14:49,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2020-12-23 07:14:49,349 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:49,349 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 8, 8, 8, 4, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2020-12-23 07:14:49,563 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:14:49,564 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:49,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:49,566 INFO L82 PathProgramCache]: Analyzing trace with hash -2113646594, now seen corresponding path program 4 times [2020-12-23 07:14:49,566 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:49,567 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1285892287] [2020-12-23 07:14:49,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:49,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:49,698 INFO L134 CoverageAnalysis]: Checked inductivity of 898 backedges. 472 proven. 1 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2020-12-23 07:14:49,699 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1285892287] [2020-12-23 07:14:49,699 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [272254399] [2020-12-23 07:14:49,699 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:14:49,769 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 07:14:49,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:14:49,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-23 07:14:49,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:14:49,905 INFO L134 CoverageAnalysis]: Checked inductivity of 898 backedges. 196 proven. 9 refuted. 0 times theorem prover too weak. 693 trivial. 0 not checked. [2020-12-23 07:14:49,905 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:14:49,906 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6] total 8 [2020-12-23 07:14:49,906 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098012014] [2020-12-23 07:14:49,907 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-23 07:14:49,907 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:49,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-23 07:14:49,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-12-23 07:14:49,908 INFO L87 Difference]: Start difference. First operand 102 states and 118 transitions. Second operand 8 states. [2020-12-23 07:14:50,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:50,040 INFO L93 Difference]: Finished difference Result 450 states and 536 transitions. [2020-12-23 07:14:50,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-23 07:14:50,041 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 101 [2020-12-23 07:14:50,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:50,044 INFO L225 Difference]: With dead ends: 450 [2020-12-23 07:14:50,044 INFO L226 Difference]: Without dead ends: 352 [2020-12-23 07:14:50,045 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=90, Invalid=150, Unknown=0, NotChecked=0, Total=240 [2020-12-23 07:14:50,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2020-12-23 07:14:50,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 224. [2020-12-23 07:14:50,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-12-23 07:14:50,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 254 transitions. [2020-12-23 07:14:50,080 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 254 transitions. Word has length 101 [2020-12-23 07:14:50,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:50,081 INFO L481 AbstractCegarLoop]: Abstraction has 224 states and 254 transitions. [2020-12-23 07:14:50,081 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-23 07:14:50,081 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 254 transitions. [2020-12-23 07:14:50,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 224 [2020-12-23 07:14:50,092 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:50,092 INFO L422 BasicCegarLoop]: trace histogram [64, 64, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2020-12-23 07:14:50,309 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:14:50,310 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:50,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:50,312 INFO L82 PathProgramCache]: Analyzing trace with hash 1556657574, now seen corresponding path program 5 times [2020-12-23 07:14:50,312 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:50,313 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530314051] [2020-12-23 07:14:50,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:50,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:50,543 INFO L134 CoverageAnalysis]: Checked inductivity of 5691 backedges. 656 proven. 16 refuted. 0 times theorem prover too weak. 5019 trivial. 0 not checked. [2020-12-23 07:14:50,544 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530314051] [2020-12-23 07:14:50,544 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [726196529] [2020-12-23 07:14:50,545 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:14:50,615 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2020-12-23 07:14:50,615 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:14:50,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-23 07:14:50,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:14:50,845 INFO L134 CoverageAnalysis]: Checked inductivity of 5691 backedges. 2643 proven. 16 refuted. 0 times theorem prover too weak. 3032 trivial. 0 not checked. [2020-12-23 07:14:50,845 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:14:50,845 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-23 07:14:50,846 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796205564] [2020-12-23 07:14:50,846 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-23 07:14:50,847 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:50,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-23 07:14:50,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-23 07:14:50,848 INFO L87 Difference]: Start difference. First operand 224 states and 254 transitions. Second operand 8 states. [2020-12-23 07:14:50,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:50,928 INFO L93 Difference]: Finished difference Result 481 states and 556 transitions. [2020-12-23 07:14:50,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-23 07:14:50,931 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 223 [2020-12-23 07:14:50,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:50,933 INFO L225 Difference]: With dead ends: 481 [2020-12-23 07:14:50,933 INFO L226 Difference]: Without dead ends: 272 [2020-12-23 07:14:50,935 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 223 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-23 07:14:50,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2020-12-23 07:14:50,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 256. [2020-12-23 07:14:50,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2020-12-23 07:14:50,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 286 transitions. [2020-12-23 07:14:50,980 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 286 transitions. Word has length 223 [2020-12-23 07:14:50,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:50,985 INFO L481 AbstractCegarLoop]: Abstraction has 256 states and 286 transitions. [2020-12-23 07:14:50,985 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-23 07:14:50,985 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 286 transitions. [2020-12-23 07:14:50,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2020-12-23 07:14:50,992 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:50,993 INFO L422 BasicCegarLoop]: trace histogram [80, 80, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2020-12-23 07:14:51,193 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-12-23 07:14:51,194 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:51,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:51,195 INFO L82 PathProgramCache]: Analyzing trace with hash 1159239078, now seen corresponding path program 6 times [2020-12-23 07:14:51,195 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:51,196 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [904297252] [2020-12-23 07:14:51,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:51,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:51,508 INFO L134 CoverageAnalysis]: Checked inductivity of 8235 backedges. 956 proven. 25 refuted. 0 times theorem prover too weak. 7254 trivial. 0 not checked. [2020-12-23 07:14:51,509 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [904297252] [2020-12-23 07:14:51,509 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [859696751] [2020-12-23 07:14:51,510 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:14:51,662 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 24 check-sat command(s) [2020-12-23 07:14:51,663 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:14:51,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-23 07:14:51,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:14:52,007 INFO L134 CoverageAnalysis]: Checked inductivity of 8235 backedges. 3823 proven. 25 refuted. 0 times theorem prover too weak. 4387 trivial. 0 not checked. [2020-12-23 07:14:52,007 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:14:52,008 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-23 07:14:52,010 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541214140] [2020-12-23 07:14:52,012 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-23 07:14:52,012 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:52,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-23 07:14:52,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-23 07:14:52,018 INFO L87 Difference]: Start difference. First operand 256 states and 286 transitions. Second operand 9 states. [2020-12-23 07:14:52,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:52,078 INFO L93 Difference]: Finished difference Result 527 states and 602 transitions. [2020-12-23 07:14:52,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-23 07:14:52,078 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 255 [2020-12-23 07:14:52,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:52,081 INFO L225 Difference]: With dead ends: 527 [2020-12-23 07:14:52,081 INFO L226 Difference]: Without dead ends: 288 [2020-12-23 07:14:52,087 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 255 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-23 07:14:52,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2020-12-23 07:14:52,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 288. [2020-12-23 07:14:52,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-12-23 07:14:52,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 318 transitions. [2020-12-23 07:14:52,123 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 318 transitions. Word has length 255 [2020-12-23 07:14:52,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:52,124 INFO L481 AbstractCegarLoop]: Abstraction has 288 states and 318 transitions. [2020-12-23 07:14:52,124 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-23 07:14:52,124 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 318 transitions. [2020-12-23 07:14:52,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2020-12-23 07:14:52,129 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:52,130 INFO L422 BasicCegarLoop]: trace histogram [96, 96, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2020-12-23 07:14:52,344 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:14:52,345 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:52,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:52,345 INFO L82 PathProgramCache]: Analyzing trace with hash -1567066714, now seen corresponding path program 7 times [2020-12-23 07:14:52,345 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:52,346 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1521763810] [2020-12-23 07:14:52,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:52,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:52,548 INFO L134 CoverageAnalysis]: Checked inductivity of 11291 backedges. 2489 proven. 89 refuted. 0 times theorem prover too weak. 8713 trivial. 0 not checked. [2020-12-23 07:14:52,549 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1521763810] [2020-12-23 07:14:52,549 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1785252578] [2020-12-23 07:14:52,550 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:14:52,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:52,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-23 07:14:52,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:14:52,996 INFO L134 CoverageAnalysis]: Checked inductivity of 11291 backedges. 2489 proven. 89 refuted. 0 times theorem prover too weak. 8713 trivial. 0 not checked. [2020-12-23 07:14:52,996 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:14:52,997 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-23 07:14:52,997 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583901246] [2020-12-23 07:14:52,998 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 07:14:52,998 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:52,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 07:14:52,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 07:14:52,999 INFO L87 Difference]: Start difference. First operand 288 states and 318 transitions. Second operand 6 states. [2020-12-23 07:14:53,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:53,069 INFO L93 Difference]: Finished difference Result 772 states and 853 transitions. [2020-12-23 07:14:53,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-23 07:14:53,069 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 287 [2020-12-23 07:14:53,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:53,073 INFO L225 Difference]: With dead ends: 772 [2020-12-23 07:14:53,073 INFO L226 Difference]: Without dead ends: 520 [2020-12-23 07:14:53,075 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 287 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 07:14:53,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2020-12-23 07:14:53,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 408. [2020-12-23 07:14:53,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 408 states. [2020-12-23 07:14:53,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 446 transitions. [2020-12-23 07:14:53,115 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 446 transitions. Word has length 287 [2020-12-23 07:14:53,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:53,116 INFO L481 AbstractCegarLoop]: Abstraction has 408 states and 446 transitions. [2020-12-23 07:14:53,116 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 07:14:53,116 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 446 transitions. [2020-12-23 07:14:53,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2020-12-23 07:14:53,123 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:53,124 INFO L422 BasicCegarLoop]: trace histogram [144, 144, 24, 24, 24, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2020-12-23 07:14:53,337 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:14:53,338 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:53,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:53,339 INFO L82 PathProgramCache]: Analyzing trace with hash -2008351322, now seen corresponding path program 8 times [2020-12-23 07:14:53,340 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:53,340 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618267495] [2020-12-23 07:14:53,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:53,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:53,668 INFO L134 CoverageAnalysis]: Checked inductivity of 25215 backedges. 5548 proven. 264 refuted. 0 times theorem prover too weak. 19403 trivial. 0 not checked. [2020-12-23 07:14:53,668 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618267495] [2020-12-23 07:14:53,669 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1484753686] [2020-12-23 07:14:53,669 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:14:53,841 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 07:14:53,841 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:14:53,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 704 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-23 07:14:53,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:14:54,195 INFO L134 CoverageAnalysis]: Checked inductivity of 25215 backedges. 5548 proven. 264 refuted. 0 times theorem prover too weak. 19403 trivial. 0 not checked. [2020-12-23 07:14:54,195 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:14:54,196 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-23 07:14:54,196 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078743201] [2020-12-23 07:14:54,197 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-23 07:14:54,197 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:54,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-23 07:14:54,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-23 07:14:54,198 INFO L87 Difference]: Start difference. First operand 408 states and 446 transitions. Second operand 7 states. [2020-12-23 07:14:54,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:54,264 INFO L93 Difference]: Finished difference Result 997 states and 1093 transitions. [2020-12-23 07:14:54,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-23 07:14:54,264 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 407 [2020-12-23 07:14:54,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:54,268 INFO L225 Difference]: With dead ends: 997 [2020-12-23 07:14:54,269 INFO L226 Difference]: Without dead ends: 640 [2020-12-23 07:14:54,270 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 407 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-23 07:14:54,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 640 states. [2020-12-23 07:14:54,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 640 to 528. [2020-12-23 07:14:54,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 528 states. [2020-12-23 07:14:54,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 528 states to 528 states and 574 transitions. [2020-12-23 07:14:54,307 INFO L78 Accepts]: Start accepts. Automaton has 528 states and 574 transitions. Word has length 407 [2020-12-23 07:14:54,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:54,308 INFO L481 AbstractCegarLoop]: Abstraction has 528 states and 574 transitions. [2020-12-23 07:14:54,308 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-23 07:14:54,308 INFO L276 IsEmpty]: Start isEmpty. Operand 528 states and 574 transitions. [2020-12-23 07:14:54,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 528 [2020-12-23 07:14:54,319 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:54,319 INFO L422 BasicCegarLoop]: trace histogram [192, 192, 32, 32, 32, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2020-12-23 07:14:54,535 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-23 07:14:54,536 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:54,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:54,537 INFO L82 PathProgramCache]: Analyzing trace with hash 112297382, now seen corresponding path program 9 times [2020-12-23 07:14:54,537 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:54,538 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1016668411] [2020-12-23 07:14:54,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:54,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:54,958 INFO L134 CoverageAnalysis]: Checked inductivity of 44707 backedges. 9825 proven. 526 refuted. 0 times theorem prover too weak. 34356 trivial. 0 not checked. [2020-12-23 07:14:54,958 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1016668411] [2020-12-23 07:14:54,958 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1211965842] [2020-12-23 07:14:54,958 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:14:55,109 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2020-12-23 07:14:55,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:14:55,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-23 07:14:55,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:14:55,707 INFO L134 CoverageAnalysis]: Checked inductivity of 44707 backedges. 9836 proven. 526 refuted. 0 times theorem prover too weak. 34345 trivial. 0 not checked. [2020-12-23 07:14:55,708 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:14:55,708 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-23 07:14:55,709 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [295673695] [2020-12-23 07:14:55,710 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-23 07:14:55,710 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:55,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-23 07:14:55,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-23 07:14:55,711 INFO L87 Difference]: Start difference. First operand 528 states and 574 transitions. Second operand 8 states. [2020-12-23 07:14:55,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:55,793 INFO L93 Difference]: Finished difference Result 1222 states and 1333 transitions. [2020-12-23 07:14:55,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-23 07:14:55,794 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 527 [2020-12-23 07:14:55,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:55,799 INFO L225 Difference]: With dead ends: 1222 [2020-12-23 07:14:55,800 INFO L226 Difference]: Without dead ends: 760 [2020-12-23 07:14:55,801 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 533 GetRequests, 527 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-23 07:14:55,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 760 states. [2020-12-23 07:14:55,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 760 to 648. [2020-12-23 07:14:55,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 648 states. [2020-12-23 07:14:55,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 648 states to 648 states and 702 transitions. [2020-12-23 07:14:55,850 INFO L78 Accepts]: Start accepts. Automaton has 648 states and 702 transitions. Word has length 527 [2020-12-23 07:14:55,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:55,851 INFO L481 AbstractCegarLoop]: Abstraction has 648 states and 702 transitions. [2020-12-23 07:14:55,851 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-23 07:14:55,851 INFO L276 IsEmpty]: Start isEmpty. Operand 648 states and 702 transitions. [2020-12-23 07:14:55,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 648 [2020-12-23 07:14:55,870 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:55,871 INFO L422 BasicCegarLoop]: trace histogram [240, 240, 40, 40, 40, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2020-12-23 07:14:56,085 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:14:56,086 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:56,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:56,087 INFO L82 PathProgramCache]: Analyzing trace with hash 492047782, now seen corresponding path program 10 times [2020-12-23 07:14:56,088 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:56,088 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1244895141] [2020-12-23 07:14:56,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:56,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:56,590 INFO L134 CoverageAnalysis]: Checked inductivity of 69767 backedges. 15320 proven. 875 refuted. 0 times theorem prover too weak. 53572 trivial. 0 not checked. [2020-12-23 07:14:56,590 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1244895141] [2020-12-23 07:14:56,591 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1977211959] [2020-12-23 07:14:56,591 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:14:56,836 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 07:14:56,837 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:14:56,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 1059 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-23 07:14:56,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:14:57,451 INFO L134 CoverageAnalysis]: Checked inductivity of 69767 backedges. 15320 proven. 875 refuted. 0 times theorem prover too weak. 53572 trivial. 0 not checked. [2020-12-23 07:14:57,452 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:14:57,452 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-23 07:14:57,452 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124480845] [2020-12-23 07:14:57,453 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-23 07:14:57,453 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:57,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-23 07:14:57,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-23 07:14:57,454 INFO L87 Difference]: Start difference. First operand 648 states and 702 transitions. Second operand 9 states. [2020-12-23 07:14:57,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:57,559 INFO L93 Difference]: Finished difference Result 1335 states and 1453 transitions. [2020-12-23 07:14:57,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-23 07:14:57,560 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 647 [2020-12-23 07:14:57,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:57,564 INFO L225 Difference]: With dead ends: 1335 [2020-12-23 07:14:57,565 INFO L226 Difference]: Without dead ends: 768 [2020-12-23 07:14:57,569 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 654 GetRequests, 647 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-23 07:14:57,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 768 states. [2020-12-23 07:14:57,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 768 to 768. [2020-12-23 07:14:57,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 768 states. [2020-12-23 07:14:57,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 768 states to 768 states and 830 transitions. [2020-12-23 07:14:57,624 INFO L78 Accepts]: Start accepts. Automaton has 768 states and 830 transitions. Word has length 647 [2020-12-23 07:14:57,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:14:57,625 INFO L481 AbstractCegarLoop]: Abstraction has 768 states and 830 transitions. [2020-12-23 07:14:57,625 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-23 07:14:57,625 INFO L276 IsEmpty]: Start isEmpty. Operand 768 states and 830 transitions. [2020-12-23 07:14:57,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 768 [2020-12-23 07:14:57,633 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:14:57,634 INFO L422 BasicCegarLoop]: trace histogram [288, 288, 48, 48, 48, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2020-12-23 07:14:57,847 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2020-12-23 07:14:57,848 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:14:57,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:14:57,850 INFO L82 PathProgramCache]: Analyzing trace with hash -1921608282, now seen corresponding path program 11 times [2020-12-23 07:14:57,850 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:14:57,851 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1832902182] [2020-12-23 07:14:57,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:14:57,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:14:58,527 INFO L134 CoverageAnalysis]: Checked inductivity of 100395 backedges. 37786 proven. 3149 refuted. 0 times theorem prover too weak. 59460 trivial. 0 not checked. [2020-12-23 07:14:58,527 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1832902182] [2020-12-23 07:14:58,528 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1092402817] [2020-12-23 07:14:58,528 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:14:58,737 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 83 check-sat command(s) [2020-12-23 07:14:58,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:14:58,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 416 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-23 07:14:58,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:14:59,701 INFO L134 CoverageAnalysis]: Checked inductivity of 100395 backedges. 62978 proven. 3149 refuted. 0 times theorem prover too weak. 34268 trivial. 0 not checked. [2020-12-23 07:14:59,702 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:14:59,702 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-23 07:14:59,702 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562300494] [2020-12-23 07:14:59,704 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 07:14:59,704 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:14:59,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 07:14:59,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 07:14:59,705 INFO L87 Difference]: Start difference. First operand 768 states and 830 transitions. Second operand 6 states. [2020-12-23 07:14:59,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:14:59,868 INFO L93 Difference]: Finished difference Result 2085 states and 2254 transitions. [2020-12-23 07:14:59,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-23 07:14:59,869 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 767 [2020-12-23 07:14:59,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:14:59,877 INFO L225 Difference]: With dead ends: 2085 [2020-12-23 07:14:59,877 INFO L226 Difference]: Without dead ends: 1508 [2020-12-23 07:14:59,879 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 771 GetRequests, 767 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 07:14:59,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1508 states. [2020-12-23 07:14:59,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1508 to 1140. [2020-12-23 07:14:59,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1140 states. [2020-12-23 07:15:00,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1140 states to 1140 states and 1230 transitions. [2020-12-23 07:15:00,004 INFO L78 Accepts]: Start accepts. Automaton has 1140 states and 1230 transitions. Word has length 767 [2020-12-23 07:15:00,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:15:00,005 INFO L481 AbstractCegarLoop]: Abstraction has 1140 states and 1230 transitions. [2020-12-23 07:15:00,005 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 07:15:00,005 INFO L276 IsEmpty]: Start isEmpty. Operand 1140 states and 1230 transitions. [2020-12-23 07:15:00,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1140 [2020-12-23 07:15:00,024 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:15:00,025 INFO L422 BasicCegarLoop]: trace histogram [432, 432, 72, 72, 72, 12, 12, 12, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2020-12-23 07:15:00,239 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-23 07:15:00,240 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:15:00,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:15:00,241 INFO L82 PathProgramCache]: Analyzing trace with hash -1982396250, now seen corresponding path program 12 times [2020-12-23 07:15:00,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:15:00,242 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944447990] [2020-12-23 07:15:00,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:15:00,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:15:01,421 INFO L134 CoverageAnalysis]: Checked inductivity of 226105 backedges. 84997 proven. 9444 refuted. 0 times theorem prover too weak. 131664 trivial. 0 not checked. [2020-12-23 07:15:01,421 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944447990] [2020-12-23 07:15:01,421 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1986299265] [2020-12-23 07:15:01,421 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:15:02,163 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 193 check-sat command(s) [2020-12-23 07:15:02,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:15:02,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 989 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-23 07:15:02,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:15:03,772 INFO L134 CoverageAnalysis]: Checked inductivity of 226105 backedges. 85001 proven. 9444 refuted. 0 times theorem prover too weak. 131660 trivial. 0 not checked. [2020-12-23 07:15:03,772 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:15:03,772 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-23 07:15:03,773 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180797302] [2020-12-23 07:15:03,774 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-23 07:15:03,774 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:15:03,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-23 07:15:03,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-23 07:15:03,775 INFO L87 Difference]: Start difference. First operand 1140 states and 1230 transitions. Second operand 7 states. [2020-12-23 07:15:03,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:15:03,930 INFO L93 Difference]: Finished difference Result 2736 states and 2954 transitions. [2020-12-23 07:15:03,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-23 07:15:03,930 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 1139 [2020-12-23 07:15:03,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:15:03,940 INFO L225 Difference]: With dead ends: 2736 [2020-12-23 07:15:03,940 INFO L226 Difference]: Without dead ends: 1880 [2020-12-23 07:15:03,943 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 1144 GetRequests, 1139 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-23 07:15:03,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1880 states. [2020-12-23 07:15:04,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1880 to 1512. [2020-12-23 07:15:04,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1512 states. [2020-12-23 07:15:04,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1512 states to 1512 states and 1630 transitions. [2020-12-23 07:15:04,073 INFO L78 Accepts]: Start accepts. Automaton has 1512 states and 1630 transitions. Word has length 1139 [2020-12-23 07:15:04,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:15:04,074 INFO L481 AbstractCegarLoop]: Abstraction has 1512 states and 1630 transitions. [2020-12-23 07:15:04,074 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-23 07:15:04,074 INFO L276 IsEmpty]: Start isEmpty. Operand 1512 states and 1630 transitions. [2020-12-23 07:15:04,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1512 [2020-12-23 07:15:04,095 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:15:04,096 INFO L422 BasicCegarLoop]: trace histogram [576, 576, 96, 96, 96, 16, 16, 16, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2020-12-23 07:15:04,310 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-23 07:15:04,311 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:15:04,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:15:04,313 INFO L82 PathProgramCache]: Analyzing trace with hash 58666406, now seen corresponding path program 13 times [2020-12-23 07:15:04,313 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:15:04,314 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1359502685] [2020-12-23 07:15:04,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:15:04,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:15:06,400 INFO L134 CoverageAnalysis]: Checked inductivity of 402167 backedges. 151090 proven. 18886 refuted. 0 times theorem prover too weak. 232191 trivial. 0 not checked. [2020-12-23 07:15:06,401 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1359502685] [2020-12-23 07:15:06,401 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1705132732] [2020-12-23 07:15:06,401 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:15:06,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:15:06,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 2480 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-23 07:15:06,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:15:09,122 INFO L134 CoverageAnalysis]: Checked inductivity of 402167 backedges. 151090 proven. 18886 refuted. 0 times theorem prover too weak. 232191 trivial. 0 not checked. [2020-12-23 07:15:09,123 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:15:09,123 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-23 07:15:09,123 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136970678] [2020-12-23 07:15:09,125 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-23 07:15:09,125 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:15:09,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-23 07:15:09,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-23 07:15:09,126 INFO L87 Difference]: Start difference. First operand 1512 states and 1630 transitions. Second operand 8 states. [2020-12-23 07:15:09,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:15:09,295 INFO L93 Difference]: Finished difference Result 3387 states and 3654 transitions. [2020-12-23 07:15:09,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-23 07:15:09,296 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 1511 [2020-12-23 07:15:09,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:15:09,307 INFO L225 Difference]: With dead ends: 3387 [2020-12-23 07:15:09,307 INFO L226 Difference]: Without dead ends: 2252 [2020-12-23 07:15:09,310 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 1517 GetRequests, 1511 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-23 07:15:09,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2252 states. [2020-12-23 07:15:09,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2252 to 1884. [2020-12-23 07:15:09,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1884 states. [2020-12-23 07:15:09,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1884 states to 1884 states and 2030 transitions. [2020-12-23 07:15:09,432 INFO L78 Accepts]: Start accepts. Automaton has 1884 states and 2030 transitions. Word has length 1511 [2020-12-23 07:15:09,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:15:09,433 INFO L481 AbstractCegarLoop]: Abstraction has 1884 states and 2030 transitions. [2020-12-23 07:15:09,433 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-23 07:15:09,433 INFO L276 IsEmpty]: Start isEmpty. Operand 1884 states and 2030 transitions. [2020-12-23 07:15:09,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1884 [2020-12-23 07:15:09,465 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:15:09,466 INFO L422 BasicCegarLoop]: trace histogram [720, 720, 120, 120, 120, 20, 20, 20, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2020-12-23 07:15:09,681 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-23 07:15:09,682 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:15:09,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:15:09,683 INFO L82 PathProgramCache]: Analyzing trace with hash 574149798, now seen corresponding path program 14 times [2020-12-23 07:15:09,684 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:15:09,684 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1100446797] [2020-12-23 07:15:09,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:15:10,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:15:12,477 INFO L134 CoverageAnalysis]: Checked inductivity of 628581 backedges. 236065 proven. 31475 refuted. 0 times theorem prover too weak. 361041 trivial. 0 not checked. [2020-12-23 07:15:12,477 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1100446797] [2020-12-23 07:15:12,477 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [534763593] [2020-12-23 07:15:12,478 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:15:13,159 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 07:15:13,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:15:13,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 3080 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-23 07:15:13,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:15:16,057 INFO L134 CoverageAnalysis]: Checked inductivity of 628581 backedges. 236065 proven. 31475 refuted. 0 times theorem prover too weak. 361041 trivial. 0 not checked. [2020-12-23 07:15:16,058 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:15:16,058 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-23 07:15:16,059 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81468583] [2020-12-23 07:15:16,060 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-23 07:15:16,060 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:15:16,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-23 07:15:16,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-23 07:15:16,061 INFO L87 Difference]: Start difference. First operand 1884 states and 2030 transitions. Second operand 9 states. [2020-12-23 07:15:16,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:15:16,249 INFO L93 Difference]: Finished difference Result 3670 states and 3958 transitions. [2020-12-23 07:15:16,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-23 07:15:16,250 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 1883 [2020-12-23 07:15:16,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:15:16,261 INFO L225 Difference]: With dead ends: 3670 [2020-12-23 07:15:16,262 INFO L226 Difference]: Without dead ends: 2256 [2020-12-23 07:15:16,266 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 1890 GetRequests, 1883 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-23 07:15:16,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2256 states. [2020-12-23 07:15:16,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2256 to 2256. [2020-12-23 07:15:16,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2256 states. [2020-12-23 07:15:16,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2256 states to 2256 states and 2430 transitions. [2020-12-23 07:15:16,420 INFO L78 Accepts]: Start accepts. Automaton has 2256 states and 2430 transitions. Word has length 1883 [2020-12-23 07:15:16,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:15:16,421 INFO L481 AbstractCegarLoop]: Abstraction has 2256 states and 2430 transitions. [2020-12-23 07:15:16,421 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-23 07:15:16,422 INFO L276 IsEmpty]: Start isEmpty. Operand 2256 states and 2430 transitions. [2020-12-23 07:15:16,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2256 [2020-12-23 07:15:16,466 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:15:16,467 INFO L422 BasicCegarLoop]: trace histogram [864, 864, 144, 144, 144, 24, 24, 24, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1] [2020-12-23 07:15:16,681 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:15:16,682 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:15:16,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:15:16,683 INFO L82 PathProgramCache]: Analyzing trace with hash 1623901606, now seen corresponding path program 15 times [2020-12-23 07:15:16,683 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:15:16,684 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733207897] [2020-12-23 07:15:16,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:15:17,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:15:21,074 INFO L134 CoverageAnalysis]: Checked inductivity of 905347 backedges. 453235 proven. 113309 refuted. 0 times theorem prover too weak. 338803 trivial. 0 not checked. [2020-12-23 07:15:21,074 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733207897] [2020-12-23 07:15:21,074 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1306742296] [2020-12-23 07:15:21,074 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:15:23,615 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 377 check-sat command(s) [2020-12-23 07:15:23,615 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:15:23,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 2345 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-23 07:15:23,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:15:28,280 INFO L134 CoverageAnalysis]: Checked inductivity of 905347 backedges. 453236 proven. 113309 refuted. 0 times theorem prover too weak. 338802 trivial. 0 not checked. [2020-12-23 07:15:28,280 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:15:28,281 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-23 07:15:28,281 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388392418] [2020-12-23 07:15:28,283 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 07:15:28,283 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:15:28,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 07:15:28,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 07:15:28,283 INFO L87 Difference]: Start difference. First operand 2256 states and 2430 transitions. Second operand 6 states. [2020-12-23 07:15:28,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:15:28,539 INFO L93 Difference]: Finished difference Result 5628 states and 6063 transitions. [2020-12-23 07:15:28,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-23 07:15:28,540 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 2255 [2020-12-23 07:15:28,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:15:28,561 INFO L225 Difference]: With dead ends: 5628 [2020-12-23 07:15:28,561 INFO L226 Difference]: Without dead ends: 4498 [2020-12-23 07:15:28,565 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2259 GetRequests, 2255 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-23 07:15:28,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4498 states. [2020-12-23 07:15:28,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4498 to 3378. [2020-12-23 07:15:28,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3378 states. [2020-12-23 07:15:28,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3378 states to 3378 states and 3638 transitions. [2020-12-23 07:15:28,774 INFO L78 Accepts]: Start accepts. Automaton has 3378 states and 3638 transitions. Word has length 2255 [2020-12-23 07:15:28,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:15:28,776 INFO L481 AbstractCegarLoop]: Abstraction has 3378 states and 3638 transitions. [2020-12-23 07:15:28,776 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 07:15:28,776 INFO L276 IsEmpty]: Start isEmpty. Operand 3378 states and 3638 transitions. [2020-12-23 07:15:28,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3378 [2020-12-23 07:15:28,859 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:15:28,861 INFO L422 BasicCegarLoop]: trace histogram [1296, 1296, 216, 216, 216, 36, 36, 36, 6, 6, 6, 2, 2, 2, 1, 1, 1, 1, 1] [2020-12-23 07:15:29,061 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:15:29,062 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:15:29,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:15:29,064 INFO L82 PathProgramCache]: Analyzing trace with hash -951274498, now seen corresponding path program 16 times [2020-12-23 07:15:29,065 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:15:29,065 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1145955699] [2020-12-23 07:15:29,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:15:30,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:15:39,352 INFO L134 CoverageAnalysis]: Checked inductivity of 2037860 backedges. 1019772 proven. 339924 refuted. 0 times theorem prover too weak. 678164 trivial. 0 not checked. [2020-12-23 07:15:39,352 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1145955699] [2020-12-23 07:15:39,352 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1631504246] [2020-12-23 07:15:39,353 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:15:40,530 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 07:15:40,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:15:40,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 5463 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-23 07:15:40,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:15:48,764 INFO L134 CoverageAnalysis]: Checked inductivity of 2037860 backedges. 1019772 proven. 339924 refuted. 0 times theorem prover too weak. 678164 trivial. 0 not checked. [2020-12-23 07:15:48,765 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:15:48,765 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-23 07:15:48,766 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888596963] [2020-12-23 07:15:48,768 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-23 07:15:48,768 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:15:48,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-23 07:15:48,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-23 07:15:48,769 INFO L87 Difference]: Start difference. First operand 3378 states and 3638 transitions. Second operand 7 states. [2020-12-23 07:15:49,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:15:49,068 INFO L93 Difference]: Finished difference Result 7311 states and 7875 transitions. [2020-12-23 07:15:49,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-23 07:15:49,069 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 3377 [2020-12-23 07:15:49,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:15:49,096 INFO L225 Difference]: With dead ends: 7311 [2020-12-23 07:15:49,096 INFO L226 Difference]: Without dead ends: 5620 [2020-12-23 07:15:49,101 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3382 GetRequests, 3377 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-23 07:15:49,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5620 states. [2020-12-23 07:15:49,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5620 to 4500. [2020-12-23 07:15:49,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4500 states. [2020-12-23 07:15:49,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4500 states to 4500 states and 4846 transitions. [2020-12-23 07:15:49,394 INFO L78 Accepts]: Start accepts. Automaton has 4500 states and 4846 transitions. Word has length 3377 [2020-12-23 07:15:49,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:15:49,396 INFO L481 AbstractCegarLoop]: Abstraction has 4500 states and 4846 transitions. [2020-12-23 07:15:49,396 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-23 07:15:49,396 INFO L276 IsEmpty]: Start isEmpty. Operand 4500 states and 4846 transitions. [2020-12-23 07:15:49,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4500 [2020-12-23 07:15:49,601 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:15:49,602 INFO L422 BasicCegarLoop]: trace histogram [1728, 1728, 288, 288, 288, 48, 48, 48, 8, 8, 8, 2, 2, 2, 1, 1, 1, 1, 1] [2020-12-23 07:15:49,803 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:15:49,803 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:15:49,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:15:49,806 INFO L82 PathProgramCache]: Analyzing trace with hash 694903206, now seen corresponding path program 17 times [2020-12-23 07:15:49,806 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:15:49,807 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75183827] [2020-12-23 07:15:49,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:15:51,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:16:05,208 INFO L134 CoverageAnalysis]: Checked inductivity of 3623601 backedges. 1812923 proven. 679846 refuted. 0 times theorem prover too weak. 1130832 trivial. 0 not checked. [2020-12-23 07:16:05,208 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75183827] [2020-12-23 07:16:05,209 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2104955936] [2020-12-23 07:16:05,209 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 07:16:16,220 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 1002 check-sat command(s) [2020-12-23 07:16:16,221 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:16:16,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 7262 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-23 07:16:16,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:16:30,268 INFO L134 CoverageAnalysis]: Checked inductivity of 3623601 backedges. 1812923 proven. 679846 refuted. 0 times theorem prover too weak. 1130832 trivial. 0 not checked. [2020-12-23 07:16:30,269 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:16:30,270 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-23 07:16:30,270 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923668446] [2020-12-23 07:16:30,274 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-23 07:16:30,274 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:16:30,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-23 07:16:30,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-23 07:16:30,275 INFO L87 Difference]: Start difference. First operand 4500 states and 4846 transitions. Second operand 8 states. [2020-12-23 07:16:30,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:16:30,645 INFO L93 Difference]: Finished difference Result 8994 states and 9687 transitions. [2020-12-23 07:16:30,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-23 07:16:30,646 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 4499 [2020-12-23 07:16:30,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:16:30,681 INFO L225 Difference]: With dead ends: 8994 [2020-12-23 07:16:30,681 INFO L226 Difference]: Without dead ends: 6742 [2020-12-23 07:16:30,687 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4505 GetRequests, 4499 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-23 07:16:30,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6742 states. [2020-12-23 07:16:31,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6742 to 5622. [2020-12-23 07:16:31,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5622 states. [2020-12-23 07:16:31,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5622 states to 5622 states and 6054 transitions. [2020-12-23 07:16:31,029 INFO L78 Accepts]: Start accepts. Automaton has 5622 states and 6054 transitions. Word has length 4499 [2020-12-23 07:16:31,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:16:31,032 INFO L481 AbstractCegarLoop]: Abstraction has 5622 states and 6054 transitions. [2020-12-23 07:16:31,032 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-23 07:16:31,032 INFO L276 IsEmpty]: Start isEmpty. Operand 5622 states and 6054 transitions. [2020-12-23 07:16:31,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5622 [2020-12-23 07:16:31,196 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:16:31,198 INFO L422 BasicCegarLoop]: trace histogram [2160, 2160, 360, 360, 360, 60, 60, 60, 10, 10, 10, 2, 2, 2, 1, 1, 1, 1, 1] [2020-12-23 07:16:31,398 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2020-12-23 07:16:31,399 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:16:31,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:16:31,402 INFO L82 PathProgramCache]: Analyzing trace with hash 129948158, now seen corresponding path program 18 times [2020-12-23 07:16:31,402 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:16:31,402 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1412659822] [2020-12-23 07:16:31,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:16:35,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 07:16:55,553 INFO L134 CoverageAnalysis]: Checked inductivity of 5662570 backedges. 2832688 proven. 1133075 refuted. 0 times theorem prover too weak. 1696807 trivial. 0 not checked. [2020-12-23 07:16:55,553 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1412659822] [2020-12-23 07:16:55,553 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [274713383] [2020-12-23 07:16:55,554 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 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 [2020-12-23 07:17:13,139 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 1066 check-sat command(s) [2020-12-23 07:17:13,140 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 07:17:13,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 6842 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-23 07:17:13,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 07:17:40,546 INFO L134 CoverageAnalysis]: Checked inductivity of 5662570 backedges. 0 proven. 2832690 refuted. 0 times theorem prover too weak. 2829880 trivial. 0 not checked. [2020-12-23 07:17:40,547 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 07:17:40,549 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 11 [2020-12-23 07:17:40,549 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212566742] [2020-12-23 07:17:40,554 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-23 07:17:40,555 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 07:17:40,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-23 07:17:40,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2020-12-23 07:17:40,556 INFO L87 Difference]: Start difference. First operand 5622 states and 6054 transitions. Second operand 11 states. [2020-12-23 07:17:41,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 07:17:41,419 INFO L93 Difference]: Finished difference Result 16294 states and 17551 transitions. [2020-12-23 07:17:41,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-12-23 07:17:41,420 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 5621 [2020-12-23 07:17:41,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 07:17:41,467 INFO L225 Difference]: With dead ends: 16294 [2020-12-23 07:17:41,467 INFO L226 Difference]: Without dead ends: 13481 [2020-12-23 07:17:41,476 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5646 GetRequests, 5619 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=280, Invalid=532, Unknown=0, NotChecked=0, Total=812 [2020-12-23 07:17:41,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13481 states. [2020-12-23 07:17:42,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13481 to 10113. [2020-12-23 07:17:42,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10113 states. [2020-12-23 07:17:42,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10113 states to 10113 states and 10890 transitions. [2020-12-23 07:17:42,076 INFO L78 Accepts]: Start accepts. Automaton has 10113 states and 10890 transitions. Word has length 5621 [2020-12-23 07:17:42,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 07:17:42,080 INFO L481 AbstractCegarLoop]: Abstraction has 10113 states and 10890 transitions. [2020-12-23 07:17:42,080 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-23 07:17:42,080 INFO L276 IsEmpty]: Start isEmpty. Operand 10113 states and 10890 transitions. [2020-12-23 07:17:42,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10113 [2020-12-23 07:17:42,621 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 07:17:42,624 INFO L422 BasicCegarLoop]: trace histogram [3888, 3888, 648, 648, 648, 108, 108, 108, 18, 18, 18, 3, 3, 3, 1, 1, 1, 1, 1] [2020-12-23 07:17:42,825 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2020-12-23 07:17:42,825 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 07:17:42,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 07:17:42,829 INFO L82 PathProgramCache]: Analyzing trace with hash 1006391510, now seen corresponding path program 19 times [2020-12-23 07:17:42,829 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 07:17:42,829 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [735322565] [2020-12-23 07:17:42,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 07:17:56,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat