/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/loop-acceleration/const_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-dcfa08f [2020-12-23 06:48:16,338 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-23 06:48:16,340 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-23 06:48:16,390 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-23 06:48:16,390 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-23 06:48:16,395 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-23 06:48:16,398 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-23 06:48:16,404 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-23 06:48:16,419 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-23 06:48:16,426 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-23 06:48:16,430 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-23 06:48:16,431 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-23 06:48:16,431 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-23 06:48:16,433 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-23 06:48:16,434 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-23 06:48:16,435 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-23 06:48:16,436 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-23 06:48:16,437 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-23 06:48:16,439 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-23 06:48:16,441 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-23 06:48:16,442 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-23 06:48:16,444 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-23 06:48:16,445 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-23 06:48:16,446 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-23 06:48:16,448 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-23 06:48:16,449 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-23 06:48:16,449 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-23 06:48:16,450 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-23 06:48:16,451 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-23 06:48:16,452 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-23 06:48:16,452 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-23 06:48:16,453 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-23 06:48:16,454 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-23 06:48:16,455 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-23 06:48:16,456 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-23 06:48:16,456 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-23 06:48:16,457 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-23 06:48:16,457 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-23 06:48:16,457 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-23 06:48:16,458 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-23 06:48:16,459 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-23 06:48:16,460 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-23 06:48:16,486 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-23 06:48:16,486 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-23 06:48:16,488 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-23 06:48:16,488 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-23 06:48:16,488 INFO L138 SettingsManager]: * Use SBE=true [2020-12-23 06:48:16,489 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-23 06:48:16,489 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-23 06:48:16,489 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-23 06:48:16,489 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-23 06:48:16,490 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-23 06:48:16,490 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-23 06:48:16,490 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-23 06:48:16,490 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-23 06:48:16,491 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-23 06:48:16,491 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-23 06:48:16,491 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-23 06:48:16,491 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-23 06:48:16,492 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 06:48:16,492 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-23 06:48:16,492 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-23 06:48:16,492 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-23 06:48:16,493 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-23 06:48:16,493 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-23 06:48:16,493 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-23 06:48:16,493 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-23 06:48:16,494 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-23 06:48:16,919 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-23 06:48:16,949 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-23 06:48:16,952 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-23 06:48:16,954 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-23 06:48:16,954 INFO L275 PluginConnector]: CDTParser initialized [2020-12-23 06:48:16,955 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-acceleration/const_1-2.c [2020-12-23 06:48:17,044 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/ce6cc1017/4dd445552afd435aaee1f15253b3fd2a/FLAG7366891ed [2020-12-23 06:48:17,633 INFO L306 CDTParser]: Found 1 translation units. [2020-12-23 06:48:17,634 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loop-acceleration/const_1-2.c [2020-12-23 06:48:17,640 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/ce6cc1017/4dd445552afd435aaee1f15253b3fd2a/FLAG7366891ed [2020-12-23 06:48:17,995 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/ce6cc1017/4dd445552afd435aaee1f15253b3fd2a [2020-12-23 06:48:17,998 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-23 06:48:18,000 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-23 06:48:18,002 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-23 06:48:18,002 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-23 06:48:18,005 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-23 06:48:18,006 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 06:48:17" (1/1) ... [2020-12-23 06:48:18,007 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@efcf072 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:48:18, skipping insertion in model container [2020-12-23 06:48:18,008 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 06:48:17" (1/1) ... [2020-12-23 06:48:18,016 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-23 06:48:18,030 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-23 06:48:18,197 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loop-acceleration/const_1-2.c[321,334] left hand side expression in assignment: lhs: VariableLHS[~x~0,] [2020-12-23 06:48:18,214 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 06:48:18,224 INFO L203 MainTranslator]: Completed pre-run [2020-12-23 06:48:18,238 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loop-acceleration/const_1-2.c[321,334] left hand side expression in assignment: lhs: VariableLHS[~x~0,] [2020-12-23 06:48:18,241 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 06:48:18,257 INFO L208 MainTranslator]: Completed translation [2020-12-23 06:48:18,257 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:48:18 WrapperNode [2020-12-23 06:48:18,258 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-23 06:48:18,259 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-23 06:48:18,259 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-23 06:48:18,259 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-23 06:48:18,268 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:48:18" (1/1) ... [2020-12-23 06:48:18,275 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:48:18" (1/1) ... [2020-12-23 06:48:18,294 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-23 06:48:18,295 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-23 06:48:18,295 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-23 06:48:18,295 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-23 06:48:18,304 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:48:18" (1/1) ... [2020-12-23 06:48:18,305 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:48:18" (1/1) ... [2020-12-23 06:48:18,306 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:48:18" (1/1) ... [2020-12-23 06:48:18,306 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:48:18" (1/1) ... [2020-12-23 06:48:18,309 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:48:18" (1/1) ... [2020-12-23 06:48:18,313 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:48:18" (1/1) ... [2020-12-23 06:48:18,314 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:48:18" (1/1) ... [2020-12-23 06:48:18,316 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-23 06:48:18,317 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-23 06:48:18,317 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-23 06:48:18,317 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-23 06:48:18,318 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:48:18" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 06:48:18,435 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-23 06:48:18,435 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-23 06:48:18,436 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-23 06:48:18,436 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-23 06:48:18,760 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-23 06:48:18,761 INFO L299 CfgBuilder]: Removed 7 assume(true) statements. [2020-12-23 06:48:18,762 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 06:48:18 BoogieIcfgContainer [2020-12-23 06:48:18,763 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-23 06:48:18,764 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-23 06:48:18,765 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-23 06:48:18,768 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-23 06:48:18,768 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.12 06:48:17" (1/3) ... [2020-12-23 06:48:18,769 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@239a3f88 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 06:48:18, skipping insertion in model container [2020-12-23 06:48:18,769 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:48:18" (2/3) ... [2020-12-23 06:48:18,770 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@239a3f88 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 06:48:18, skipping insertion in model container [2020-12-23 06:48:18,770 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 06:48:18" (3/3) ... [2020-12-23 06:48:18,772 INFO L111 eAbstractionObserver]: Analyzing ICFG const_1-2.c [2020-12-23 06:48:18,779 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-23 06:48:18,784 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-23 06:48:18,804 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-23 06:48:18,832 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-23 06:48:18,832 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-23 06:48:18,833 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-23 06:48:18,833 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-23 06:48:18,833 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-23 06:48:18,833 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-23 06:48:18,833 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-23 06:48:18,834 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-23 06:48:18,848 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states. [2020-12-23 06:48:18,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-23 06:48:18,853 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:18,854 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-12-23 06:48:18,854 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:18,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:18,861 INFO L82 PathProgramCache]: Analyzing trace with hash 889633835, now seen corresponding path program 1 times [2020-12-23 06:48:18,872 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:18,873 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [463557479] [2020-12-23 06:48:18,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:19,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:19,087 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:19,088 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [463557479] [2020-12-23 06:48:19,089 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 06:48:19,089 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-23 06:48:19,090 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081525517] [2020-12-23 06:48:19,095 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 06:48:19,095 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:19,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 06:48:19,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 06:48:19,113 INFO L87 Difference]: Start difference. First operand 10 states. Second operand 3 states. [2020-12-23 06:48:19,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:19,149 INFO L93 Difference]: Finished difference Result 18 states and 22 transitions. [2020-12-23 06:48:19,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 06:48:19,152 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2020-12-23 06:48:19,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:19,174 INFO L225 Difference]: With dead ends: 18 [2020-12-23 06:48:19,174 INFO L226 Difference]: Without dead ends: 8 [2020-12-23 06:48:19,179 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 06:48:19,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2020-12-23 06:48:19,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2020-12-23 06:48:19,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2020-12-23 06:48:19,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2020-12-23 06:48:19,241 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2020-12-23 06:48:19,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:19,242 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2020-12-23 06:48:19,242 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 06:48:19,242 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2020-12-23 06:48:19,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-12-23 06:48:19,242 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:19,243 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:19,243 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-23 06:48:19,243 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:19,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:19,244 INFO L82 PathProgramCache]: Analyzing trace with hash 1810510480, now seen corresponding path program 1 times [2020-12-23 06:48:19,244 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:19,245 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1216582235] [2020-12-23 06:48:19,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:19,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:19,346 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:19,346 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1216582235] [2020-12-23 06:48:19,346 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1912812833] [2020-12-23 06:48:19,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:19,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:19,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-23 06:48:19,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:19,458 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:19,459 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:19,459 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-23 06:48:19,460 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578796430] [2020-12-23 06:48:19,461 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-23 06:48:19,461 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:19,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-23 06:48:19,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-23 06:48:19,463 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 5 states. [2020-12-23 06:48:19,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:19,488 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2020-12-23 06:48:19,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 06:48:19,490 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 7 [2020-12-23 06:48:19,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:19,490 INFO L225 Difference]: With dead ends: 13 [2020-12-23 06:48:19,490 INFO L226 Difference]: Without dead ends: 9 [2020-12-23 06:48:19,491 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-23 06:48:19,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2020-12-23 06:48:19,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2020-12-23 06:48:19,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-12-23 06:48:19,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2020-12-23 06:48:19,496 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2020-12-23 06:48:19,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:19,496 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2020-12-23 06:48:19,497 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-23 06:48:19,498 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2020-12-23 06:48:19,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-23 06:48:19,499 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:19,499 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:19,714 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-23 06:48:19,715 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:19,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:19,717 INFO L82 PathProgramCache]: Analyzing trace with hash 292915403, now seen corresponding path program 2 times [2020-12-23 06:48:19,718 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:19,718 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913649480] [2020-12-23 06:48:19,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:19,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:19,860 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:19,861 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913649480] [2020-12-23 06:48:19,861 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [281096152] [2020-12-23 06:48:19,861 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:19,923 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:48:19,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:19,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-23 06:48:19,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:20,004 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:20,004 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:20,004 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-23 06:48:20,005 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397765871] [2020-12-23 06:48:20,005 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 06:48:20,005 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:20,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 06:48:20,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-12-23 06:48:20,007 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 6 states. [2020-12-23 06:48:20,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:20,043 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2020-12-23 06:48:20,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-23 06:48:20,044 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 8 [2020-12-23 06:48:20,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:20,044 INFO L225 Difference]: With dead ends: 14 [2020-12-23 06:48:20,044 INFO L226 Difference]: Without dead ends: 10 [2020-12-23 06:48:20,045 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-12-23 06:48:20,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2020-12-23 06:48:20,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2020-12-23 06:48:20,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2020-12-23 06:48:20,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2020-12-23 06:48:20,049 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 8 [2020-12-23 06:48:20,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:20,050 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2020-12-23 06:48:20,050 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 06:48:20,050 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2020-12-23 06:48:20,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-23 06:48:20,051 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:20,051 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:20,265 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:20,266 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:20,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:20,268 INFO L82 PathProgramCache]: Analyzing trace with hash 492108272, now seen corresponding path program 3 times [2020-12-23 06:48:20,268 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:20,269 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040853583] [2020-12-23 06:48:20,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:20,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:20,422 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:20,422 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040853583] [2020-12-23 06:48:20,422 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [451670346] [2020-12-23 06:48:20,423 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:20,489 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-23 06:48:20,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:20,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-23 06:48:20,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:20,555 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:20,555 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:20,555 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-23 06:48:20,556 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952668357] [2020-12-23 06:48:20,556 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-23 06:48:20,556 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:20,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-23 06:48:20,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-12-23 06:48:20,558 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 7 states. [2020-12-23 06:48:20,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:20,595 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2020-12-23 06:48:20,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-23 06:48:20,596 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 9 [2020-12-23 06:48:20,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:20,597 INFO L225 Difference]: With dead ends: 15 [2020-12-23 06:48:20,597 INFO L226 Difference]: Without dead ends: 11 [2020-12-23 06:48:20,598 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-12-23 06:48:20,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2020-12-23 06:48:20,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2020-12-23 06:48:20,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-12-23 06:48:20,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2020-12-23 06:48:20,602 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2020-12-23 06:48:20,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:20,602 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2020-12-23 06:48:20,603 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-23 06:48:20,603 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2020-12-23 06:48:20,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-23 06:48:20,603 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:20,604 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:20,817 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:20,819 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:20,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:20,820 INFO L82 PathProgramCache]: Analyzing trace with hash -1922847381, now seen corresponding path program 4 times [2020-12-23 06:48:20,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:20,821 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1391022572] [2020-12-23 06:48:20,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:20,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:21,014 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:21,015 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1391022572] [2020-12-23 06:48:21,016 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2084824803] [2020-12-23 06:48:21,017 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:21,080 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:48:21,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:21,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-23 06:48:21,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:21,144 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:21,145 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:21,145 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-23 06:48:21,146 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657772713] [2020-12-23 06:48:21,146 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-23 06:48:21,146 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:21,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-23 06:48:21,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-12-23 06:48:21,148 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 8 states. [2020-12-23 06:48:21,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:21,198 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2020-12-23 06:48:21,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-23 06:48:21,199 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 10 [2020-12-23 06:48:21,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:21,200 INFO L225 Difference]: With dead ends: 16 [2020-12-23 06:48:21,200 INFO L226 Difference]: Without dead ends: 12 [2020-12-23 06:48:21,200 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-12-23 06:48:21,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-12-23 06:48:21,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-12-23 06:48:21,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-12-23 06:48:21,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-12-23 06:48:21,204 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-12-23 06:48:21,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:21,205 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-12-23 06:48:21,205 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-23 06:48:21,205 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-12-23 06:48:21,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-23 06:48:21,206 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:21,206 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:21,422 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:21,422 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:21,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:21,424 INFO L82 PathProgramCache]: Analyzing trace with hash 522938704, now seen corresponding path program 5 times [2020-12-23 06:48:21,425 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:21,425 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172572805] [2020-12-23 06:48:21,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:21,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:21,576 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:21,576 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172572805] [2020-12-23 06:48:21,577 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [915089631] [2020-12-23 06:48:21,577 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:21,644 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-12-23 06:48:21,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:21,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-23 06:48:21,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:21,749 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:21,749 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:21,749 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-23 06:48:21,750 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660523862] [2020-12-23 06:48:21,750 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-23 06:48:21,750 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:21,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-23 06:48:21,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-12-23 06:48:21,752 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 9 states. [2020-12-23 06:48:21,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:21,810 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2020-12-23 06:48:21,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-23 06:48:21,810 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 11 [2020-12-23 06:48:21,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:21,811 INFO L225 Difference]: With dead ends: 17 [2020-12-23 06:48:21,811 INFO L226 Difference]: Without dead ends: 13 [2020-12-23 06:48:21,812 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-12-23 06:48:21,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-12-23 06:48:21,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-12-23 06:48:21,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-12-23 06:48:21,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-12-23 06:48:21,815 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-12-23 06:48:21,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:21,816 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-12-23 06:48:21,816 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-23 06:48:21,816 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-12-23 06:48:21,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-23 06:48:21,816 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:21,817 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:22,032 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-23 06:48:22,033 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:22,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:22,034 INFO L82 PathProgramCache]: Analyzing trace with hash -967103989, now seen corresponding path program 6 times [2020-12-23 06:48:22,034 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:22,034 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646792220] [2020-12-23 06:48:22,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:22,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:22,161 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:22,162 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646792220] [2020-12-23 06:48:22,162 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1539948543] [2020-12-23 06:48:22,162 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:22,214 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2020-12-23 06:48:22,214 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:22,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-23 06:48:22,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:22,293 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:22,293 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:22,293 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-23 06:48:22,294 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740903170] [2020-12-23 06:48:22,294 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-23 06:48:22,294 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:22,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-23 06:48:22,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-12-23 06:48:22,295 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 10 states. [2020-12-23 06:48:22,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:22,352 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-12-23 06:48:22,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-23 06:48:22,353 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 12 [2020-12-23 06:48:22,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:22,354 INFO L225 Difference]: With dead ends: 18 [2020-12-23 06:48:22,354 INFO L226 Difference]: Without dead ends: 14 [2020-12-23 06:48:22,354 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 9 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-12-23 06:48:22,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-12-23 06:48:22,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-12-23 06:48:22,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-12-23 06:48:22,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-12-23 06:48:22,358 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-12-23 06:48:22,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:22,358 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-12-23 06:48:22,358 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-23 06:48:22,358 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-12-23 06:48:22,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-12-23 06:48:22,359 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:22,359 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:22,573 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:22,574 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:22,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:22,575 INFO L82 PathProgramCache]: Analyzing trace with hash 86212784, now seen corresponding path program 7 times [2020-12-23 06:48:22,576 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:22,577 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1010772680] [2020-12-23 06:48:22,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:22,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:22,741 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:22,741 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1010772680] [2020-12-23 06:48:22,741 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [281379540] [2020-12-23 06:48:22,741 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:22,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:22,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-23 06:48:22,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:22,872 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:22,873 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:22,873 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-23 06:48:22,873 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526998594] [2020-12-23 06:48:22,875 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-23 06:48:22,875 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:22,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-23 06:48:22,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-12-23 06:48:22,876 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 11 states. [2020-12-23 06:48:22,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:22,946 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-12-23 06:48:22,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-23 06:48:22,947 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 13 [2020-12-23 06:48:22,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:22,948 INFO L225 Difference]: With dead ends: 19 [2020-12-23 06:48:22,948 INFO L226 Difference]: Without dead ends: 15 [2020-12-23 06:48:22,949 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-12-23 06:48:22,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-12-23 06:48:22,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-12-23 06:48:22,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-12-23 06:48:22,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-12-23 06:48:22,960 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-12-23 06:48:22,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:22,961 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-12-23 06:48:22,961 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-23 06:48:22,961 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-12-23 06:48:22,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-12-23 06:48:22,962 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:22,963 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:23,176 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:23,177 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:23,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:23,179 INFO L82 PathProgramCache]: Analyzing trace with hash -1620705621, now seen corresponding path program 8 times [2020-12-23 06:48:23,179 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:23,180 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1192096025] [2020-12-23 06:48:23,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:23,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:23,343 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:23,343 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1192096025] [2020-12-23 06:48:23,344 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [442770898] [2020-12-23 06:48:23,344 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:23,395 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:48:23,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:23,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-23 06:48:23,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:23,465 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:23,465 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:23,465 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-23 06:48:23,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215429142] [2020-12-23 06:48:23,469 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-23 06:48:23,469 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:23,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-23 06:48:23,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-12-23 06:48:23,470 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 12 states. [2020-12-23 06:48:23,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:23,542 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-12-23 06:48:23,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-23 06:48:23,543 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 14 [2020-12-23 06:48:23,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:23,544 INFO L225 Difference]: With dead ends: 20 [2020-12-23 06:48:23,544 INFO L226 Difference]: Without dead ends: 16 [2020-12-23 06:48:23,544 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-12-23 06:48:23,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-12-23 06:48:23,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-12-23 06:48:23,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-12-23 06:48:23,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-12-23 06:48:23,548 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-12-23 06:48:23,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:23,548 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-12-23 06:48:23,548 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-23 06:48:23,549 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-12-23 06:48:23,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-23 06:48:23,549 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:23,549 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:23,763 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-23 06:48:23,764 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:23,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:23,766 INFO L82 PathProgramCache]: Analyzing trace with hash 1299398672, now seen corresponding path program 9 times [2020-12-23 06:48:23,766 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:23,767 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1387305545] [2020-12-23 06:48:23,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:23,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:23,927 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:23,927 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1387305545] [2020-12-23 06:48:23,927 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [493159187] [2020-12-23 06:48:23,927 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:24,004 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-12-23 06:48:24,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:24,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 22 conjunts are in the unsatisfiable core [2020-12-23 06:48:24,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:24,072 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:24,072 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:24,073 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2020-12-23 06:48:24,073 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969833120] [2020-12-23 06:48:24,073 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-23 06:48:24,073 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:24,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-23 06:48:24,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-12-23 06:48:24,074 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 13 states. [2020-12-23 06:48:24,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:24,155 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-12-23 06:48:24,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-23 06:48:24,156 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 15 [2020-12-23 06:48:24,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:24,156 INFO L225 Difference]: With dead ends: 21 [2020-12-23 06:48:24,156 INFO L226 Difference]: Without dead ends: 17 [2020-12-23 06:48:24,157 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-12-23 06:48:24,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-12-23 06:48:24,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-12-23 06:48:24,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-23 06:48:24,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-12-23 06:48:24,161 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-12-23 06:48:24,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:24,161 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-12-23 06:48:24,161 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-23 06:48:24,161 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-12-23 06:48:24,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-23 06:48:24,162 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:24,162 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:24,377 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:24,378 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:24,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:24,379 INFO L82 PathProgramCache]: Analyzing trace with hash 1628318539, now seen corresponding path program 10 times [2020-12-23 06:48:24,379 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:24,379 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903434638] [2020-12-23 06:48:24,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:24,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:24,587 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:24,587 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [903434638] [2020-12-23 06:48:24,587 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1671370731] [2020-12-23 06:48:24,588 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:24,641 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:48:24,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:24,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 23 conjunts are in the unsatisfiable core [2020-12-23 06:48:24,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:24,722 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:24,723 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:24,723 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-12-23 06:48:24,723 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1825153918] [2020-12-23 06:48:24,724 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-23 06:48:24,724 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:24,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-23 06:48:24,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-12-23 06:48:24,725 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 14 states. [2020-12-23 06:48:24,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:24,818 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-12-23 06:48:24,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-23 06:48:24,818 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 16 [2020-12-23 06:48:24,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:24,819 INFO L225 Difference]: With dead ends: 22 [2020-12-23 06:48:24,819 INFO L226 Difference]: Without dead ends: 18 [2020-12-23 06:48:24,820 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-12-23 06:48:24,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-12-23 06:48:24,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-12-23 06:48:24,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-23 06:48:24,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-12-23 06:48:24,823 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-12-23 06:48:24,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:24,823 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-12-23 06:48:24,824 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-23 06:48:24,824 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-12-23 06:48:24,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-23 06:48:24,824 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:24,824 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:25,038 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:25,039 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:25,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:25,041 INFO L82 PathProgramCache]: Analyzing trace with hash -1060067472, now seen corresponding path program 11 times [2020-12-23 06:48:25,041 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:25,042 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [232320846] [2020-12-23 06:48:25,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:25,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:25,239 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:25,239 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [232320846] [2020-12-23 06:48:25,239 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1259039240] [2020-12-23 06:48:25,240 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:25,480 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2020-12-23 06:48:25,481 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:25,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 30 conjunts are in the unsatisfiable core [2020-12-23 06:48:25,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:25,580 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:25,580 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:25,580 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-23 06:48:25,581 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395685098] [2020-12-23 06:48:25,582 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-23 06:48:25,582 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:25,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-23 06:48:25,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-12-23 06:48:25,583 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 15 states. [2020-12-23 06:48:25,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:25,681 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-12-23 06:48:25,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-23 06:48:25,682 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 17 [2020-12-23 06:48:25,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:25,682 INFO L225 Difference]: With dead ends: 23 [2020-12-23 06:48:25,682 INFO L226 Difference]: Without dead ends: 19 [2020-12-23 06:48:25,683 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 13 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-12-23 06:48:25,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-23 06:48:25,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-12-23 06:48:25,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-23 06:48:25,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-12-23 06:48:25,687 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-12-23 06:48:25,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:25,687 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-12-23 06:48:25,687 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-23 06:48:25,687 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-12-23 06:48:25,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-12-23 06:48:25,688 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:25,688 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:25,891 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-23 06:48:25,891 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:25,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:25,892 INFO L82 PathProgramCache]: Analyzing trace with hash 1499312107, now seen corresponding path program 12 times [2020-12-23 06:48:25,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:25,893 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1683354791] [2020-12-23 06:48:25,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:25,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:26,104 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:26,104 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1683354791] [2020-12-23 06:48:26,105 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1894513900] [2020-12-23 06:48:26,105 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:26,224 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-23 06:48:26,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:26,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 33 conjunts are in the unsatisfiable core [2020-12-23 06:48:26,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:26,380 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:26,381 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:26,381 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-12-23 06:48:26,383 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640990263] [2020-12-23 06:48:26,383 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-23 06:48:26,383 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:26,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-23 06:48:26,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-12-23 06:48:26,384 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 16 states. [2020-12-23 06:48:26,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:26,509 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-12-23 06:48:26,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-23 06:48:26,510 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 18 [2020-12-23 06:48:26,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:26,513 INFO L225 Difference]: With dead ends: 24 [2020-12-23 06:48:26,513 INFO L226 Difference]: Without dead ends: 20 [2020-12-23 06:48:26,513 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 12 SyntacticMatches, 6 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-12-23 06:48:26,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-23 06:48:26,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-12-23 06:48:26,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-23 06:48:26,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-12-23 06:48:26,520 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-12-23 06:48:26,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:26,522 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-12-23 06:48:26,522 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-23 06:48:26,522 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-12-23 06:48:26,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-12-23 06:48:26,523 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:26,523 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:26,728 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-23 06:48:26,729 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:26,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:26,730 INFO L82 PathProgramCache]: Analyzing trace with hash -764299568, now seen corresponding path program 13 times [2020-12-23 06:48:26,730 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:26,731 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [662697174] [2020-12-23 06:48:26,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:26,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:26,970 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:26,970 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [662697174] [2020-12-23 06:48:26,970 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [354346760] [2020-12-23 06:48:26,971 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:27,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:27,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 29 conjunts are in the unsatisfiable core [2020-12-23 06:48:27,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:27,081 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:27,082 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:27,082 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2020-12-23 06:48:27,082 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399948438] [2020-12-23 06:48:27,083 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-23 06:48:27,083 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:27,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-23 06:48:27,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-12-23 06:48:27,084 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 17 states. [2020-12-23 06:48:27,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:27,222 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-12-23 06:48:27,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-23 06:48:27,223 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 19 [2020-12-23 06:48:27,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:27,223 INFO L225 Difference]: With dead ends: 25 [2020-12-23 06:48:27,223 INFO L226 Difference]: Without dead ends: 21 [2020-12-23 06:48:27,224 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-12-23 06:48:27,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-12-23 06:48:27,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-12-23 06:48:27,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-12-23 06:48:27,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-12-23 06:48:27,227 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-12-23 06:48:27,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:27,228 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-12-23 06:48:27,228 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-23 06:48:27,228 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-12-23 06:48:27,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-12-23 06:48:27,229 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:27,229 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:27,444 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-23 06:48:27,445 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:27,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:27,446 INFO L82 PathProgramCache]: Analyzing trace with hash 2078182539, now seen corresponding path program 14 times [2020-12-23 06:48:27,446 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:27,446 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [593857762] [2020-12-23 06:48:27,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:27,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:27,700 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:27,701 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [593857762] [2020-12-23 06:48:27,701 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1761221535] [2020-12-23 06:48:27,701 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:27,749 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:48:27,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:27,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 31 conjunts are in the unsatisfiable core [2020-12-23 06:48:27,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:27,818 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:27,818 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:27,818 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-23 06:48:27,818 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076793309] [2020-12-23 06:48:27,819 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-23 06:48:27,820 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:27,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-23 06:48:27,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-12-23 06:48:27,821 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 18 states. [2020-12-23 06:48:27,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:27,969 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-12-23 06:48:27,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-23 06:48:27,969 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 20 [2020-12-23 06:48:27,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:27,970 INFO L225 Difference]: With dead ends: 26 [2020-12-23 06:48:27,971 INFO L226 Difference]: Without dead ends: 22 [2020-12-23 06:48:27,973 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-12-23 06:48:27,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-12-23 06:48:27,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-12-23 06:48:27,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-12-23 06:48:27,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-12-23 06:48:27,979 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-12-23 06:48:27,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:27,979 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-12-23 06:48:27,979 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-23 06:48:27,980 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-12-23 06:48:27,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-23 06:48:27,980 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:27,980 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:28,193 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:28,194 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:28,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:28,195 INFO L82 PathProgramCache]: Analyzing trace with hash 814640, now seen corresponding path program 15 times [2020-12-23 06:48:28,195 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:28,196 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204635766] [2020-12-23 06:48:28,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:28,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:28,472 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:28,473 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204635766] [2020-12-23 06:48:28,473 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [770382510] [2020-12-23 06:48:28,473 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:28,621 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-12-23 06:48:28,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:28,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 37 conjunts are in the unsatisfiable core [2020-12-23 06:48:28,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:28,776 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:28,776 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:28,776 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2020-12-23 06:48:28,776 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609311719] [2020-12-23 06:48:28,777 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-23 06:48:28,777 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:28,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-23 06:48:28,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-12-23 06:48:28,778 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 19 states. [2020-12-23 06:48:28,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:28,931 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-12-23 06:48:28,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-23 06:48:28,932 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 21 [2020-12-23 06:48:28,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:28,933 INFO L225 Difference]: With dead ends: 27 [2020-12-23 06:48:28,933 INFO L226 Difference]: Without dead ends: 23 [2020-12-23 06:48:28,933 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 17 SyntacticMatches, 4 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-12-23 06:48:28,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-12-23 06:48:28,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-12-23 06:48:28,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-23 06:48:28,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-12-23 06:48:28,937 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-12-23 06:48:28,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:28,937 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-12-23 06:48:28,937 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-23 06:48:28,937 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-12-23 06:48:28,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-12-23 06:48:28,938 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:28,938 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:29,146 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-23 06:48:29,146 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:29,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:29,147 INFO L82 PathProgramCache]: Analyzing trace with hash 26919211, now seen corresponding path program 16 times [2020-12-23 06:48:29,147 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:29,147 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1649560573] [2020-12-23 06:48:29,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:29,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:29,437 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:29,437 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1649560573] [2020-12-23 06:48:29,438 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2081467520] [2020-12-23 06:48:29,438 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:29,485 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:48:29,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:29,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 35 conjunts are in the unsatisfiable core [2020-12-23 06:48:29,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:29,546 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:29,546 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:29,546 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-12-23 06:48:29,546 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296692988] [2020-12-23 06:48:29,547 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-23 06:48:29,547 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:29,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-23 06:48:29,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-12-23 06:48:29,548 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 20 states. [2020-12-23 06:48:29,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:29,741 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-12-23 06:48:29,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-23 06:48:29,741 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 22 [2020-12-23 06:48:29,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:29,742 INFO L225 Difference]: With dead ends: 28 [2020-12-23 06:48:29,742 INFO L226 Difference]: Without dead ends: 24 [2020-12-23 06:48:29,742 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-12-23 06:48:29,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-12-23 06:48:29,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-12-23 06:48:29,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-23 06:48:29,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-12-23 06:48:29,746 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-12-23 06:48:29,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:29,746 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-12-23 06:48:29,746 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-23 06:48:29,746 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-12-23 06:48:29,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-12-23 06:48:29,747 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:29,747 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:29,961 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-23 06:48:29,962 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:29,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:29,963 INFO L82 PathProgramCache]: Analyzing trace with hash 836160912, now seen corresponding path program 17 times [2020-12-23 06:48:29,963 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:29,963 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1444860447] [2020-12-23 06:48:29,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:29,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:30,320 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:30,321 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1444860447] [2020-12-23 06:48:30,321 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [139625508] [2020-12-23 06:48:30,321 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 06:48:31,261 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2020-12-23 06:48:31,262 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:31,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 42 conjunts are in the unsatisfiable core [2020-12-23 06:48:31,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:31,402 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:31,403 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:31,403 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2020-12-23 06:48:31,403 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377795442] [2020-12-23 06:48:31,404 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-23 06:48:31,404 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:31,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-23 06:48:31,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-12-23 06:48:31,405 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 21 states. [2020-12-23 06:48:31,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:31,609 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-12-23 06:48:31,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-23 06:48:31,610 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 23 [2020-12-23 06:48:31,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:31,610 INFO L225 Difference]: With dead ends: 29 [2020-12-23 06:48:31,610 INFO L226 Difference]: Without dead ends: 25 [2020-12-23 06:48:31,611 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 17 SyntacticMatches, 6 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-12-23 06:48:31,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-12-23 06:48:31,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-12-23 06:48:31,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-23 06:48:31,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-12-23 06:48:31,614 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-12-23 06:48:31,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:31,615 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-12-23 06:48:31,615 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-23 06:48:31,615 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-12-23 06:48:31,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-23 06:48:31,616 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:31,616 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:31,819 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-23 06:48:31,820 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:31,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:31,821 INFO L82 PathProgramCache]: Analyzing trace with hash 152849867, now seen corresponding path program 18 times [2020-12-23 06:48:31,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:31,821 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134284915] [2020-12-23 06:48:31,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:31,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:32,195 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:32,195 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134284915] [2020-12-23 06:48:32,196 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1680457041] [2020-12-23 06:48:32,196 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 06:48:32,405 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2020-12-23 06:48:32,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:32,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 44 conjunts are in the unsatisfiable core [2020-12-23 06:48:32,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:32,587 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:32,588 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:32,588 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-12-23 06:48:32,588 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1774155380] [2020-12-23 06:48:32,588 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-12-23 06:48:32,589 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:32,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-12-23 06:48:32,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-12-23 06:48:32,590 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 22 states. [2020-12-23 06:48:32,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:32,843 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-12-23 06:48:32,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-23 06:48:32,843 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 24 [2020-12-23 06:48:32,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:32,844 INFO L225 Difference]: With dead ends: 30 [2020-12-23 06:48:32,844 INFO L226 Difference]: Without dead ends: 26 [2020-12-23 06:48:32,845 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 19 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-12-23 06:48:32,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-12-23 06:48:32,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-12-23 06:48:32,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-12-23 06:48:32,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-12-23 06:48:32,849 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-12-23 06:48:32,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:32,849 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-12-23 06:48:32,849 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-12-23 06:48:32,849 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-12-23 06:48:32,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-23 06:48:32,850 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:32,850 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:33,053 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:33,054 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:33,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:33,055 INFO L82 PathProgramCache]: Analyzing trace with hash 445043952, now seen corresponding path program 19 times [2020-12-23 06:48:33,056 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:33,056 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251515236] [2020-12-23 06:48:33,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:33,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:33,444 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:33,444 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251515236] [2020-12-23 06:48:33,445 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [778955667] [2020-12-23 06:48:33,445 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:33,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:33,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 41 conjunts are in the unsatisfiable core [2020-12-23 06:48:33,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:33,566 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:33,567 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:33,567 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2020-12-23 06:48:33,567 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863437485] [2020-12-23 06:48:33,567 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-12-23 06:48:33,568 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:33,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-12-23 06:48:33,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-12-23 06:48:33,569 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 23 states. [2020-12-23 06:48:33,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:33,835 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-12-23 06:48:33,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-12-23 06:48:33,836 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 25 [2020-12-23 06:48:33,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:33,836 INFO L225 Difference]: With dead ends: 31 [2020-12-23 06:48:33,836 INFO L226 Difference]: Without dead ends: 27 [2020-12-23 06:48:33,837 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-12-23 06:48:33,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-12-23 06:48:33,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-12-23 06:48:33,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-12-23 06:48:33,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-12-23 06:48:33,841 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-12-23 06:48:33,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:33,841 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-12-23 06:48:33,841 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-12-23 06:48:33,841 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-12-23 06:48:33,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-12-23 06:48:33,842 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:33,842 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:34,055 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:34,056 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:34,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:34,057 INFO L82 PathProgramCache]: Analyzing trace with hash 913125995, now seen corresponding path program 20 times [2020-12-23 06:48:34,057 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:34,058 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1758972679] [2020-12-23 06:48:34,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:34,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:34,467 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:34,468 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1758972679] [2020-12-23 06:48:34,468 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [163791039] [2020-12-23 06:48:34,468 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:34,525 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:48:34,525 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:34,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 43 conjunts are in the unsatisfiable core [2020-12-23 06:48:34,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:34,605 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:34,605 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:34,605 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-12-23 06:48:34,606 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148648507] [2020-12-23 06:48:34,606 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-23 06:48:34,606 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:34,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-23 06:48:34,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-12-23 06:48:34,607 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 24 states. [2020-12-23 06:48:34,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:34,899 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-12-23 06:48:34,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-23 06:48:34,900 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 26 [2020-12-23 06:48:34,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:34,900 INFO L225 Difference]: With dead ends: 32 [2020-12-23 06:48:34,900 INFO L226 Difference]: Without dead ends: 28 [2020-12-23 06:48:34,901 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-12-23 06:48:34,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-12-23 06:48:34,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-12-23 06:48:34,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-23 06:48:34,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-12-23 06:48:34,904 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-12-23 06:48:34,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:34,904 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-12-23 06:48:34,904 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-23 06:48:34,905 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-12-23 06:48:34,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-12-23 06:48:34,905 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:34,905 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:35,112 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2020-12-23 06:48:35,113 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:35,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:35,114 INFO L82 PathProgramCache]: Analyzing trace with hash -1756199856, now seen corresponding path program 21 times [2020-12-23 06:48:35,114 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:35,114 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [819663800] [2020-12-23 06:48:35,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:35,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:35,579 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:35,579 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [819663800] [2020-12-23 06:48:35,579 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [322248213] [2020-12-23 06:48:35,580 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:35,936 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2020-12-23 06:48:35,936 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:35,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 55 conjunts are in the unsatisfiable core [2020-12-23 06:48:35,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:36,317 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:36,317 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:36,317 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 25 [2020-12-23 06:48:36,318 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018813193] [2020-12-23 06:48:36,318 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-12-23 06:48:36,318 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:36,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-12-23 06:48:36,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-12-23 06:48:36,319 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 25 states. [2020-12-23 06:48:36,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:36,706 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-12-23 06:48:36,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-12-23 06:48:36,707 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 27 [2020-12-23 06:48:36,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:36,707 INFO L225 Difference]: With dead ends: 33 [2020-12-23 06:48:36,707 INFO L226 Difference]: Without dead ends: 29 [2020-12-23 06:48:36,708 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 17 SyntacticMatches, 10 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-12-23 06:48:36,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-12-23 06:48:36,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-12-23 06:48:36,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-12-23 06:48:36,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-12-23 06:48:36,712 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-12-23 06:48:36,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:36,712 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-12-23 06:48:36,712 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-12-23 06:48:36,713 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-12-23 06:48:36,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-12-23 06:48:36,713 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:36,714 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:36,916 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2020-12-23 06:48:36,917 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:36,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:36,917 INFO L82 PathProgramCache]: Analyzing trace with hash 1394044683, now seen corresponding path program 22 times [2020-12-23 06:48:36,917 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:36,918 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1975072346] [2020-12-23 06:48:36,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:36,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:37,457 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:37,458 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1975072346] [2020-12-23 06:48:37,458 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [877005081] [2020-12-23 06:48:37,458 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:37,509 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:48:37,509 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:37,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 47 conjunts are in the unsatisfiable core [2020-12-23 06:48:37,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:37,587 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:37,588 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:37,588 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2020-12-23 06:48:37,588 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322552399] [2020-12-23 06:48:37,588 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-12-23 06:48:37,588 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:37,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-12-23 06:48:37,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-12-23 06:48:37,589 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 26 states. [2020-12-23 06:48:37,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:37,957 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-12-23 06:48:37,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-12-23 06:48:37,958 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 28 [2020-12-23 06:48:37,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:37,959 INFO L225 Difference]: With dead ends: 34 [2020-12-23 06:48:37,959 INFO L226 Difference]: Without dead ends: 30 [2020-12-23 06:48:37,960 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-12-23 06:48:37,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-12-23 06:48:37,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-12-23 06:48:37,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-12-23 06:48:37,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-12-23 06:48:37,963 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-12-23 06:48:37,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:37,964 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-12-23 06:48:37,964 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-12-23 06:48:37,964 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-12-23 06:48:37,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-12-23 06:48:37,964 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:37,965 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:38,178 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:38,179 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:38,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:38,180 INFO L82 PathProgramCache]: Analyzing trace with hash 267377584, now seen corresponding path program 23 times [2020-12-23 06:48:38,180 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:38,181 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472652547] [2020-12-23 06:48:38,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:38,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:38,716 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:38,716 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472652547] [2020-12-23 06:48:38,717 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [714307964] [2020-12-23 06:48:38,717 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:42,900 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2020-12-23 06:48:42,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:42,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 49 conjunts are in the unsatisfiable core [2020-12-23 06:48:42,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:42,998 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:42,998 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:42,998 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 27 [2020-12-23 06:48:42,999 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892569460] [2020-12-23 06:48:42,999 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-12-23 06:48:42,999 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:43,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-12-23 06:48:43,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-12-23 06:48:43,000 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 27 states. [2020-12-23 06:48:43,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:43,426 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-12-23 06:48:43,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-12-23 06:48:43,426 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 29 [2020-12-23 06:48:43,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:43,427 INFO L225 Difference]: With dead ends: 35 [2020-12-23 06:48:43,427 INFO L226 Difference]: Without dead ends: 31 [2020-12-23 06:48:43,428 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-12-23 06:48:43,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-12-23 06:48:43,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-12-23 06:48:43,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-12-23 06:48:43,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-12-23 06:48:43,432 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-12-23 06:48:43,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:43,432 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-12-23 06:48:43,432 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-12-23 06:48:43,432 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-12-23 06:48:43,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-12-23 06:48:43,433 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:43,433 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:43,636 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2020-12-23 06:48:43,638 INFO L429 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:43,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:43,639 INFO L82 PathProgramCache]: Analyzing trace with hash -299564117, now seen corresponding path program 24 times [2020-12-23 06:48:43,639 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:43,639 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432758733] [2020-12-23 06:48:43,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:43,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:44,159 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:44,160 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432758733] [2020-12-23 06:48:44,160 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [709842623] [2020-12-23 06:48:44,160 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:44,747 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-12-23 06:48:44,747 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:44,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 62 conjunts are in the unsatisfiable core [2020-12-23 06:48:44,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:45,180 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:45,181 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:45,181 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2020-12-23 06:48:45,181 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276050296] [2020-12-23 06:48:45,181 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-12-23 06:48:45,181 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:45,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-12-23 06:48:45,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-12-23 06:48:45,182 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 28 states. [2020-12-23 06:48:45,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:45,620 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-12-23 06:48:45,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-12-23 06:48:45,621 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 30 [2020-12-23 06:48:45,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:45,621 INFO L225 Difference]: With dead ends: 36 [2020-12-23 06:48:45,621 INFO L226 Difference]: Without dead ends: 32 [2020-12-23 06:48:45,622 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 18 SyntacticMatches, 12 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-12-23 06:48:45,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-23 06:48:45,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-12-23 06:48:45,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-12-23 06:48:45,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-12-23 06:48:45,625 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-12-23 06:48:45,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:45,626 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-12-23 06:48:45,626 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-12-23 06:48:45,626 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-12-23 06:48:45,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-12-23 06:48:45,627 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:45,627 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:45,832 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:45,833 INFO L429 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:45,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:45,834 INFO L82 PathProgramCache]: Analyzing trace with hash -694887664, now seen corresponding path program 25 times [2020-12-23 06:48:45,834 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:45,835 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1248433960] [2020-12-23 06:48:45,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:45,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:46,388 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:46,388 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1248433960] [2020-12-23 06:48:46,391 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [688300564] [2020-12-23 06:48:46,391 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:46,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:46,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 53 conjunts are in the unsatisfiable core [2020-12-23 06:48:46,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:46,542 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:46,542 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:46,542 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 29 [2020-12-23 06:48:46,542 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573017258] [2020-12-23 06:48:46,543 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-12-23 06:48:46,543 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:46,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-12-23 06:48:46,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-12-23 06:48:46,544 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 29 states. [2020-12-23 06:48:47,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:47,033 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-12-23 06:48:47,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-12-23 06:48:47,034 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 31 [2020-12-23 06:48:47,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:47,034 INFO L225 Difference]: With dead ends: 37 [2020-12-23 06:48:47,034 INFO L226 Difference]: Without dead ends: 33 [2020-12-23 06:48:47,035 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-12-23 06:48:47,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-12-23 06:48:47,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-12-23 06:48:47,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-12-23 06:48:47,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-12-23 06:48:47,054 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-12-23 06:48:47,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:47,054 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-12-23 06:48:47,054 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-12-23 06:48:47,054 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-12-23 06:48:47,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-12-23 06:48:47,055 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:47,058 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:47,259 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2020-12-23 06:48:47,259 INFO L429 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:47,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:47,260 INFO L82 PathProgramCache]: Analyzing trace with hash -65015733, now seen corresponding path program 26 times [2020-12-23 06:48:47,260 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:47,260 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1600026231] [2020-12-23 06:48:47,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:47,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:47,909 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:47,909 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1600026231] [2020-12-23 06:48:47,910 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2121013942] [2020-12-23 06:48:47,910 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:47,964 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:48:47,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:47,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 55 conjunts are in the unsatisfiable core [2020-12-23 06:48:47,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:48,055 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:48,055 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:48,055 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2020-12-23 06:48:48,055 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929879701] [2020-12-23 06:48:48,056 INFO L461 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-12-23 06:48:48,056 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:48,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-12-23 06:48:48,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-12-23 06:48:48,057 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 30 states. [2020-12-23 06:48:48,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:48,587 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-12-23 06:48:48,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-12-23 06:48:48,588 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 32 [2020-12-23 06:48:48,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:48,589 INFO L225 Difference]: With dead ends: 38 [2020-12-23 06:48:48,589 INFO L226 Difference]: Without dead ends: 34 [2020-12-23 06:48:48,590 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-12-23 06:48:48,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-12-23 06:48:48,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-12-23 06:48:48,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-12-23 06:48:48,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-12-23 06:48:48,593 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-12-23 06:48:48,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:48,593 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-12-23 06:48:48,593 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-12-23 06:48:48,593 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-12-23 06:48:48,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-12-23 06:48:48,594 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:48,594 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:48,807 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2020-12-23 06:48:48,808 INFO L429 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:48,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:48,809 INFO L82 PathProgramCache]: Analyzing trace with hash -2013822352, now seen corresponding path program 27 times [2020-12-23 06:48:48,809 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:48,809 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [722646025] [2020-12-23 06:48:48,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:48,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:49,473 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:49,473 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [722646025] [2020-12-23 06:48:49,473 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [9556712] [2020-12-23 06:48:49,473 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:49,938 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2020-12-23 06:48:49,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:49,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 65 conjunts are in the unsatisfiable core [2020-12-23 06:48:49,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:50,352 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:50,353 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:50,353 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 31 [2020-12-23 06:48:50,353 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509081003] [2020-12-23 06:48:50,353 INFO L461 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-12-23 06:48:50,353 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:50,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-12-23 06:48:50,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-12-23 06:48:50,354 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 31 states. [2020-12-23 06:48:50,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:50,923 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-12-23 06:48:50,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-12-23 06:48:50,923 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 33 [2020-12-23 06:48:50,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:50,924 INFO L225 Difference]: With dead ends: 39 [2020-12-23 06:48:50,924 INFO L226 Difference]: Without dead ends: 35 [2020-12-23 06:48:50,925 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 25 SyntacticMatches, 8 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-12-23 06:48:50,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-12-23 06:48:50,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-12-23 06:48:50,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-12-23 06:48:50,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-12-23 06:48:50,928 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-12-23 06:48:50,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:50,928 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-12-23 06:48:50,928 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-12-23 06:48:50,929 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-12-23 06:48:50,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-12-23 06:48:50,929 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:50,929 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:51,133 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2020-12-23 06:48:51,133 INFO L429 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:51,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:51,134 INFO L82 PathProgramCache]: Analyzing trace with hash 1997681899, now seen corresponding path program 28 times [2020-12-23 06:48:51,134 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:51,134 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1691863153] [2020-12-23 06:48:51,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:51,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:51,884 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:51,884 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1691863153] [2020-12-23 06:48:51,884 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1072427035] [2020-12-23 06:48:51,884 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:51,946 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:48:51,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:51,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 59 conjunts are in the unsatisfiable core [2020-12-23 06:48:51,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:52,039 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:52,039 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:52,040 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 32 [2020-12-23 06:48:52,040 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349912328] [2020-12-23 06:48:52,040 INFO L461 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-12-23 06:48:52,040 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:52,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-12-23 06:48:52,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-12-23 06:48:52,041 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 32 states. [2020-12-23 06:48:52,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:52,632 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-12-23 06:48:52,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-12-23 06:48:52,632 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 34 [2020-12-23 06:48:52,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:52,633 INFO L225 Difference]: With dead ends: 40 [2020-12-23 06:48:52,633 INFO L226 Difference]: Without dead ends: 36 [2020-12-23 06:48:52,633 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-12-23 06:48:52,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-23 06:48:52,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-12-23 06:48:52,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-23 06:48:52,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-12-23 06:48:52,638 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-12-23 06:48:52,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:52,638 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-12-23 06:48:52,638 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-12-23 06:48:52,639 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-12-23 06:48:52,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-12-23 06:48:52,639 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:52,639 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:52,840 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2020-12-23 06:48:52,840 INFO L429 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:52,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:52,841 INFO L82 PathProgramCache]: Analyzing trace with hash 1800262096, now seen corresponding path program 29 times [2020-12-23 06:48:52,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:52,842 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1960462731] [2020-12-23 06:48:52,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:52,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:53,662 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:53,662 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1960462731] [2020-12-23 06:48:53,663 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [264228787] [2020-12-23 06:48:53,663 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:56,160 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2020-12-23 06:48:56,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:48:56,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 85 conjunts are in the unsatisfiable core [2020-12-23 06:48:56,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:48:56,970 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:56,971 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:48:56,971 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32] total 33 [2020-12-23 06:48:56,971 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931965640] [2020-12-23 06:48:56,971 INFO L461 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-12-23 06:48:56,972 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:48:56,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-12-23 06:48:56,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-12-23 06:48:56,973 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 33 states. [2020-12-23 06:48:57,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:48:57,621 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-12-23 06:48:57,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-12-23 06:48:57,622 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 35 [2020-12-23 06:48:57,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:48:57,622 INFO L225 Difference]: With dead ends: 41 [2020-12-23 06:48:57,623 INFO L226 Difference]: Without dead ends: 37 [2020-12-23 06:48:57,623 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 10 SyntacticMatches, 25 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-12-23 06:48:57,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-12-23 06:48:57,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-12-23 06:48:57,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-12-23 06:48:57,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-12-23 06:48:57,632 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-12-23 06:48:57,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:48:57,632 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-12-23 06:48:57,633 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-12-23 06:48:57,633 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-12-23 06:48:57,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-23 06:48:57,634 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:48:57,634 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1] [2020-12-23 06:48:57,838 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:48:57,838 INFO L429 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:48:57,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:48:57,839 INFO L82 PathProgramCache]: Analyzing trace with hash -24784501, now seen corresponding path program 30 times [2020-12-23 06:48:57,839 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:48:57,840 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1648743821] [2020-12-23 06:48:57,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:48:57,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:48:58,591 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:48:58,591 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1648743821] [2020-12-23 06:48:58,592 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1019853693] [2020-12-23 06:48:58,592 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:49:01,270 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2020-12-23 06:49:01,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:49:01,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 77 conjunts are in the unsatisfiable core [2020-12-23 06:49:01,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:49:01,874 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:01,875 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:49:01,875 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 34 [2020-12-23 06:49:01,875 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180811744] [2020-12-23 06:49:01,875 INFO L461 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-12-23 06:49:01,875 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:49:01,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-12-23 06:49:01,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-12-23 06:49:01,876 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 34 states. [2020-12-23 06:49:02,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:49:02,541 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-12-23 06:49:02,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-12-23 06:49:02,542 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 36 [2020-12-23 06:49:02,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:49:02,543 INFO L225 Difference]: With dead ends: 42 [2020-12-23 06:49:02,543 INFO L226 Difference]: Without dead ends: 38 [2020-12-23 06:49:02,544 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 22 SyntacticMatches, 14 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-12-23 06:49:02,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-12-23 06:49:02,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-12-23 06:49:02,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-12-23 06:49:02,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-12-23 06:49:02,548 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-12-23 06:49:02,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:49:02,548 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-12-23 06:49:02,548 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-12-23 06:49:02,548 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-12-23 06:49:02,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-12-23 06:49:02,549 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:49:02,549 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1] [2020-12-23 06:49:02,752 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:49:02,753 INFO L429 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:49:02,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:49:02,754 INFO L82 PathProgramCache]: Analyzing trace with hash -766654160, now seen corresponding path program 31 times [2020-12-23 06:49:02,754 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:49:02,755 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191820298] [2020-12-23 06:49:02,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:49:02,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:49:03,697 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:03,697 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [191820298] [2020-12-23 06:49:03,697 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [680690892] [2020-12-23 06:49:03,697 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:49:03,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:49:03,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 65 conjunts are in the unsatisfiable core [2020-12-23 06:49:03,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:49:03,868 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:03,868 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:49:03,868 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34] total 35 [2020-12-23 06:49:03,868 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079916333] [2020-12-23 06:49:03,869 INFO L461 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-12-23 06:49:03,869 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:49:03,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-12-23 06:49:03,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-12-23 06:49:03,870 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 35 states. [2020-12-23 06:49:04,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:49:04,607 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-12-23 06:49:04,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-12-23 06:49:04,608 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 37 [2020-12-23 06:49:04,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:49:04,609 INFO L225 Difference]: With dead ends: 43 [2020-12-23 06:49:04,609 INFO L226 Difference]: Without dead ends: 39 [2020-12-23 06:49:04,610 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-12-23 06:49:04,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-12-23 06:49:04,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-12-23 06:49:04,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-12-23 06:49:04,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-12-23 06:49:04,613 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-12-23 06:49:04,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:49:04,614 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-12-23 06:49:04,614 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-12-23 06:49:04,614 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-12-23 06:49:04,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-12-23 06:49:04,614 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:49:04,614 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1] [2020-12-23 06:49:04,829 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,32 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:49:04,830 INFO L429 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:49:04,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:49:04,831 INFO L82 PathProgramCache]: Analyzing trace with hash 2005190187, now seen corresponding path program 32 times [2020-12-23 06:49:04,831 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:49:04,831 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [49354635] [2020-12-23 06:49:04,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:49:04,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:49:05,764 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:05,764 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [49354635] [2020-12-23 06:49:05,765 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1141123179] [2020-12-23 06:49:05,765 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:49:05,832 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:49:05,833 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:49:05,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 67 conjunts are in the unsatisfiable core [2020-12-23 06:49:05,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:49:05,946 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:05,946 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:49:05,946 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 36 [2020-12-23 06:49:05,946 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679485355] [2020-12-23 06:49:05,947 INFO L461 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-12-23 06:49:05,947 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:49:05,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-12-23 06:49:05,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-12-23 06:49:05,948 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 36 states. [2020-12-23 06:49:06,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:49:06,682 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-12-23 06:49:06,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-12-23 06:49:06,683 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 38 [2020-12-23 06:49:06,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:49:06,683 INFO L225 Difference]: With dead ends: 44 [2020-12-23 06:49:06,683 INFO L226 Difference]: Without dead ends: 40 [2020-12-23 06:49:06,684 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-12-23 06:49:06,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-12-23 06:49:06,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-12-23 06:49:06,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-12-23 06:49:06,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-12-23 06:49:06,687 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-12-23 06:49:06,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:49:06,687 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-12-23 06:49:06,687 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-12-23 06:49:06,688 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-12-23 06:49:06,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-23 06:49:06,688 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:49:06,688 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1] [2020-12-23 06:49:06,891 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2020-12-23 06:49:06,892 INFO L429 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:49:06,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:49:06,894 INFO L82 PathProgramCache]: Analyzing trace with hash 2033019024, now seen corresponding path program 33 times [2020-12-23 06:49:06,894 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:49:06,894 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1674518690] [2020-12-23 06:49:06,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:49:06,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:49:07,891 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:07,891 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1674518690] [2020-12-23 06:49:07,891 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [54723936] [2020-12-23 06:49:07,891 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:49:08,765 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2020-12-23 06:49:08,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:49:08,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 69 conjunts are in the unsatisfiable core [2020-12-23 06:49:08,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:49:08,882 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:08,882 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:49:08,882 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36] total 37 [2020-12-23 06:49:08,883 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104512782] [2020-12-23 06:49:08,883 INFO L461 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-12-23 06:49:08,883 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:49:08,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-12-23 06:49:08,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-12-23 06:49:08,884 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 37 states. [2020-12-23 06:49:09,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:49:09,718 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-12-23 06:49:09,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-12-23 06:49:09,719 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 39 [2020-12-23 06:49:09,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:49:09,720 INFO L225 Difference]: With dead ends: 45 [2020-12-23 06:49:09,720 INFO L226 Difference]: Without dead ends: 41 [2020-12-23 06:49:09,720 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-12-23 06:49:09,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-12-23 06:49:09,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-12-23 06:49:09,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-12-23 06:49:09,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-12-23 06:49:09,722 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-12-23 06:49:09,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:49:09,722 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-12-23 06:49:09,722 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-12-23 06:49:09,722 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-12-23 06:49:09,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-12-23 06:49:09,723 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:49:09,723 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1] [2020-12-23 06:49:09,923 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,34 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:49:09,924 INFO L429 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:49:09,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:49:09,925 INFO L82 PathProgramCache]: Analyzing trace with hash -1399254325, now seen corresponding path program 34 times [2020-12-23 06:49:09,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:49:09,925 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1550579696] [2020-12-23 06:49:09,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:49:09,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:49:11,005 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:11,005 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1550579696] [2020-12-23 06:49:11,005 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [581525148] [2020-12-23 06:49:11,005 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:49:11,070 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:49:11,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:49:11,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 71 conjunts are in the unsatisfiable core [2020-12-23 06:49:11,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:49:11,184 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:11,185 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:49:11,185 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 38 [2020-12-23 06:49:11,185 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361339198] [2020-12-23 06:49:11,185 INFO L461 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-12-23 06:49:11,185 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:49:11,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-12-23 06:49:11,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-12-23 06:49:11,186 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 38 states. [2020-12-23 06:49:12,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:49:12,064 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-12-23 06:49:12,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-12-23 06:49:12,065 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 40 [2020-12-23 06:49:12,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:49:12,066 INFO L225 Difference]: With dead ends: 46 [2020-12-23 06:49:12,066 INFO L226 Difference]: Without dead ends: 42 [2020-12-23 06:49:12,067 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-12-23 06:49:12,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-12-23 06:49:12,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-12-23 06:49:12,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-12-23 06:49:12,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-12-23 06:49:12,070 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-12-23 06:49:12,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:49:12,070 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-12-23 06:49:12,070 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-12-23 06:49:12,070 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-12-23 06:49:12,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-12-23 06:49:12,071 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:49:12,071 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1] [2020-12-23 06:49:12,276 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2020-12-23 06:49:12,277 INFO L429 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:49:12,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:49:12,278 INFO L82 PathProgramCache]: Analyzing trace with hash -425545744, now seen corresponding path program 35 times [2020-12-23 06:49:12,278 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:49:12,278 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1862258357] [2020-12-23 06:49:12,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:49:12,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:49:13,403 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:13,403 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1862258357] [2020-12-23 06:49:13,403 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1328226583] [2020-12-23 06:49:13,404 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:49:29,198 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2020-12-23 06:49:29,199 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:49:29,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 107 conjunts are in the unsatisfiable core [2020-12-23 06:49:29,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:49:30,571 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:30,571 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:49:30,571 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38] total 39 [2020-12-23 06:49:30,572 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118353906] [2020-12-23 06:49:30,572 INFO L461 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-12-23 06:49:30,572 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:49:30,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-12-23 06:49:30,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-12-23 06:49:30,573 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 39 states. [2020-12-23 06:49:31,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:49:31,520 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-12-23 06:49:31,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-12-23 06:49:31,520 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 41 [2020-12-23 06:49:31,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:49:31,521 INFO L225 Difference]: With dead ends: 47 [2020-12-23 06:49:31,521 INFO L226 Difference]: Without dead ends: 43 [2020-12-23 06:49:31,522 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 7 SyntacticMatches, 34 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-12-23 06:49:31,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-12-23 06:49:31,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-12-23 06:49:31,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-12-23 06:49:31,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-12-23 06:49:31,525 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-12-23 06:49:31,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:49:31,525 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-12-23 06:49:31,525 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-12-23 06:49:31,525 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-12-23 06:49:31,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-12-23 06:49:31,525 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:49:31,525 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1] [2020-12-23 06:49:31,731 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,36 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:49:31,731 INFO L429 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:49:31,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:49:31,732 INFO L82 PathProgramCache]: Analyzing trace with hash -305350805, now seen corresponding path program 36 times [2020-12-23 06:49:31,732 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:49:31,732 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1187561586] [2020-12-23 06:49:31,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:49:31,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:49:32,781 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:32,782 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1187561586] [2020-12-23 06:49:32,782 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1845903208] [2020-12-23 06:49:32,782 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:49:34,726 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2020-12-23 06:49:34,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:49:34,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 90 conjunts are in the unsatisfiable core [2020-12-23 06:49:34,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:49:35,505 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:35,505 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:49:35,505 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39] total 40 [2020-12-23 06:49:35,505 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669430666] [2020-12-23 06:49:35,506 INFO L461 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-12-23 06:49:35,506 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:49:35,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-12-23 06:49:35,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-12-23 06:49:35,507 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 40 states. [2020-12-23 06:49:36,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:49:36,488 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-12-23 06:49:36,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-12-23 06:49:36,489 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 42 [2020-12-23 06:49:36,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:49:36,490 INFO L225 Difference]: With dead ends: 48 [2020-12-23 06:49:36,490 INFO L226 Difference]: Without dead ends: 44 [2020-12-23 06:49:36,491 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 27 SyntacticMatches, 15 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-12-23 06:49:36,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-12-23 06:49:36,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-12-23 06:49:36,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-12-23 06:49:36,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-12-23 06:49:36,494 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-12-23 06:49:36,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:49:36,494 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-12-23 06:49:36,494 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-12-23 06:49:36,494 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-12-23 06:49:36,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-12-23 06:49:36,495 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:49:36,495 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1] [2020-12-23 06:49:36,699 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2020-12-23 06:49:36,700 INFO L429 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:49:36,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:49:36,700 INFO L82 PathProgramCache]: Analyzing trace with hash -874274992, now seen corresponding path program 37 times [2020-12-23 06:49:36,701 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:49:36,701 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [717838790] [2020-12-23 06:49:36,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:49:36,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:49:37,926 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:37,926 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [717838790] [2020-12-23 06:49:37,926 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [872992429] [2020-12-23 06:49:37,926 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 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:49:37,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:49:37,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 77 conjunts are in the unsatisfiable core [2020-12-23 06:49:37,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:49:38,121 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:38,121 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:49:38,121 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40] total 41 [2020-12-23 06:49:38,122 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807657637] [2020-12-23 06:49:38,122 INFO L461 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-12-23 06:49:38,122 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:49:38,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-12-23 06:49:38,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-12-23 06:49:38,123 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 41 states. [2020-12-23 06:49:39,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:49:39,122 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-12-23 06:49:39,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-12-23 06:49:39,123 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 43 [2020-12-23 06:49:39,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:49:39,123 INFO L225 Difference]: With dead ends: 49 [2020-12-23 06:49:39,124 INFO L226 Difference]: Without dead ends: 45 [2020-12-23 06:49:39,125 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-12-23 06:49:39,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-12-23 06:49:39,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-12-23 06:49:39,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-12-23 06:49:39,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-12-23 06:49:39,129 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-12-23 06:49:39,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:49:39,130 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-12-23 06:49:39,130 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-12-23 06:49:39,130 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-12-23 06:49:39,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-12-23 06:49:39,130 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:49:39,130 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1] [2020-12-23 06:49:39,330 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2020-12-23 06:49:39,331 INFO L429 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:49:39,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:49:39,332 INFO L82 PathProgramCache]: Analyzing trace with hash -1331055605, now seen corresponding path program 38 times [2020-12-23 06:49:39,332 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:49:39,332 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1354938188] [2020-12-23 06:49:39,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:49:39,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:49:40,678 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:40,679 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1354938188] [2020-12-23 06:49:40,679 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [62735990] [2020-12-23 06:49:40,679 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:49:40,746 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:49:40,747 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:49:40,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 79 conjunts are in the unsatisfiable core [2020-12-23 06:49:40,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:49:40,866 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:40,866 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:49:40,866 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41] total 42 [2020-12-23 06:49:40,866 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827856346] [2020-12-23 06:49:40,867 INFO L461 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-12-23 06:49:40,867 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:49:40,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-12-23 06:49:40,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-12-23 06:49:40,868 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 42 states. [2020-12-23 06:49:41,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:49:41,894 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-12-23 06:49:41,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-12-23 06:49:41,894 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 44 [2020-12-23 06:49:41,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:49:41,895 INFO L225 Difference]: With dead ends: 50 [2020-12-23 06:49:41,895 INFO L226 Difference]: Without dead ends: 46 [2020-12-23 06:49:41,897 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-12-23 06:49:41,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-12-23 06:49:41,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-12-23 06:49:41,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-12-23 06:49:41,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-12-23 06:49:41,899 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-12-23 06:49:41,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:49:41,899 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-12-23 06:49:41,899 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-12-23 06:49:41,900 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-12-23 06:49:41,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-12-23 06:49:41,900 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:49:41,900 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1] [2020-12-23 06:49:42,100 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2020-12-23 06:49:42,101 INFO L429 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:49:42,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:49:42,102 INFO L82 PathProgramCache]: Analyzing trace with hash 1688614576, now seen corresponding path program 39 times [2020-12-23 06:49:42,102 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:49:42,102 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [319615523] [2020-12-23 06:49:42,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:49:42,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:49:43,469 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:43,469 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [319615523] [2020-12-23 06:49:43,469 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1684253541] [2020-12-23 06:49:43,469 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:49:44,828 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2020-12-23 06:49:44,828 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:49:44,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 96 conjunts are in the unsatisfiable core [2020-12-23 06:49:44,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:49:45,776 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:45,777 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:49:45,777 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42] total 43 [2020-12-23 06:49:45,777 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1641007370] [2020-12-23 06:49:45,777 INFO L461 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-12-23 06:49:45,777 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:49:45,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-12-23 06:49:45,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-12-23 06:49:45,778 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 43 states. [2020-12-23 06:49:46,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:49:46,930 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-12-23 06:49:46,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-12-23 06:49:46,931 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 45 [2020-12-23 06:49:46,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:49:46,932 INFO L225 Difference]: With dead ends: 51 [2020-12-23 06:49:46,932 INFO L226 Difference]: Without dead ends: 47 [2020-12-23 06:49:46,933 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 30 SyntacticMatches, 15 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-12-23 06:49:46,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-12-23 06:49:46,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-12-23 06:49:46,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-12-23 06:49:46,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-12-23 06:49:46,936 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-12-23 06:49:46,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:49:46,936 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-12-23 06:49:46,936 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-12-23 06:49:46,936 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-12-23 06:49:46,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-12-23 06:49:46,937 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:49:46,937 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1] [2020-12-23 06:49:47,140 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2020-12-23 06:49:47,141 INFO L429 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:49:47,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:49:47,142 INFO L82 PathProgramCache]: Analyzing trace with hash 809109675, now seen corresponding path program 40 times [2020-12-23 06:49:47,142 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:49:47,143 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846220395] [2020-12-23 06:49:47,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:49:47,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:49:48,443 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:48,443 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846220395] [2020-12-23 06:49:48,443 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [346311932] [2020-12-23 06:49:48,444 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 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:49:48,516 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:49:48,516 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:49:48,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 83 conjunts are in the unsatisfiable core [2020-12-23 06:49:48,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:49:48,639 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:48,639 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:49:48,639 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43] total 44 [2020-12-23 06:49:48,639 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085803182] [2020-12-23 06:49:48,640 INFO L461 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-12-23 06:49:48,640 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:49:48,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-12-23 06:49:48,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-12-23 06:49:48,641 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 44 states. [2020-12-23 06:49:49,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:49:49,821 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-12-23 06:49:49,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-12-23 06:49:49,822 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 46 [2020-12-23 06:49:49,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:49:49,822 INFO L225 Difference]: With dead ends: 52 [2020-12-23 06:49:49,823 INFO L226 Difference]: Without dead ends: 48 [2020-12-23 06:49:49,823 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-12-23 06:49:49,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-12-23 06:49:49,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-12-23 06:49:49,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-12-23 06:49:49,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-12-23 06:49:49,826 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-12-23 06:49:49,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:49:49,826 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-12-23 06:49:49,826 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-12-23 06:49:49,826 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-12-23 06:49:49,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-23 06:49:49,827 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:49:49,827 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1] [2020-12-23 06:49:50,027 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:49:50,028 INFO L429 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:49:50,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:49:50,029 INFO L82 PathProgramCache]: Analyzing trace with hash -685738480, now seen corresponding path program 41 times [2020-12-23 06:49:50,029 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:49:50,029 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1338637385] [2020-12-23 06:49:50,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:49:50,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:49:51,538 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:49:51,538 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1338637385] [2020-12-23 06:49:51,538 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [257458923] [2020-12-23 06:49:51,538 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 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:50:27,530 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2020-12-23 06:50:27,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:50:27,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 118 conjunts are in the unsatisfiable core [2020-12-23 06:50:27,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:29,162 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:29,163 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:29,163 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44] total 45 [2020-12-23 06:50:29,163 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766814268] [2020-12-23 06:50:29,163 INFO L461 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-12-23 06:50:29,163 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:29,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-12-23 06:50:29,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-12-23 06:50:29,164 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 45 states. [2020-12-23 06:50:30,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:30,451 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-12-23 06:50:30,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-12-23 06:50:30,452 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 47 [2020-12-23 06:50:30,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:30,452 INFO L225 Difference]: With dead ends: 53 [2020-12-23 06:50:30,453 INFO L226 Difference]: Without dead ends: 49 [2020-12-23 06:50:30,454 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 13 SyntacticMatches, 34 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-12-23 06:50:30,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-12-23 06:50:30,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-12-23 06:50:30,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-12-23 06:50:30,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-12-23 06:50:30,457 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-12-23 06:50:30,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:30,457 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-12-23 06:50:30,457 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-12-23 06:50:30,457 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-12-23 06:50:30,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-12-23 06:50:30,458 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:30,458 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:30,658 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2020-12-23 06:50:30,659 INFO L429 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:30,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:30,660 INFO L82 PathProgramCache]: Analyzing trace with hash 218608971, now seen corresponding path program 42 times [2020-12-23 06:50:30,660 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:30,660 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [7474924] [2020-12-23 06:50:30,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:30,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:32,230 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:32,230 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [7474924] [2020-12-23 06:50:32,230 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [158714873] [2020-12-23 06:50:32,231 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 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:50:35,200 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 22 check-sat command(s) [2020-12-23 06:50:35,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:50:35,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 116 conjunts are in the unsatisfiable core [2020-12-23 06:50:35,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:36,852 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:36,852 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:36,853 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45] total 46 [2020-12-23 06:50:36,853 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418650094] [2020-12-23 06:50:36,853 INFO L461 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-12-23 06:50:36,853 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:36,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-12-23 06:50:36,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-12-23 06:50:36,854 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 46 states. [2020-12-23 06:50:38,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:38,254 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-12-23 06:50:38,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-12-23 06:50:38,255 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 48 [2020-12-23 06:50:38,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:38,255 INFO L225 Difference]: With dead ends: 54 [2020-12-23 06:50:38,255 INFO L226 Difference]: Without dead ends: 50 [2020-12-23 06:50:38,256 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 19 SyntacticMatches, 29 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-12-23 06:50:38,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-12-23 06:50:38,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-12-23 06:50:38,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-12-23 06:50:38,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-12-23 06:50:38,259 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-12-23 06:50:38,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:38,259 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-12-23 06:50:38,259 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-12-23 06:50:38,260 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-12-23 06:50:38,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-12-23 06:50:38,260 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:38,260 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:38,464 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:50:38,465 INFO L429 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:38,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:38,466 INFO L82 PathProgramCache]: Analyzing trace with hash -1811391120, now seen corresponding path program 43 times [2020-12-23 06:50:38,466 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:38,466 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919797428] [2020-12-23 06:50:38,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:38,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:40,070 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:40,071 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [919797428] [2020-12-23 06:50:40,071 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1976016500] [2020-12-23 06:50:40,071 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 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:50:40,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:40,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 89 conjunts are in the unsatisfiable core [2020-12-23 06:50:40,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:40,274 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:40,275 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:40,275 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46] total 47 [2020-12-23 06:50:40,275 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107991633] [2020-12-23 06:50:40,275 INFO L461 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-12-23 06:50:40,275 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:40,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-12-23 06:50:40,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-12-23 06:50:40,276 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 47 states. [2020-12-23 06:50:41,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:41,710 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-12-23 06:50:41,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-12-23 06:50:41,711 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 49 [2020-12-23 06:50:41,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:41,712 INFO L225 Difference]: With dead ends: 55 [2020-12-23 06:50:41,712 INFO L226 Difference]: Without dead ends: 51 [2020-12-23 06:50:41,713 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-12-23 06:50:41,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-12-23 06:50:41,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-12-23 06:50:41,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-12-23 06:50:41,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-12-23 06:50:41,715 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-12-23 06:50:41,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:41,715 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-12-23 06:50:41,716 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-12-23 06:50:41,716 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-12-23 06:50:41,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-12-23 06:50:41,716 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:41,716 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:41,916 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:50:41,917 INFO L429 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:41,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:41,918 INFO L82 PathProgramCache]: Analyzing trace with hash -316884501, now seen corresponding path program 44 times [2020-12-23 06:50:41,918 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:41,919 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2028381918] [2020-12-23 06:50:41,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:41,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:43,562 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:43,562 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2028381918] [2020-12-23 06:50:43,563 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [200956668] [2020-12-23 06:50:43,563 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 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:50:43,639 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:50:43,639 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:50:43,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 91 conjunts are in the unsatisfiable core [2020-12-23 06:50:43,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:43,777 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:43,778 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:43,778 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47] total 48 [2020-12-23 06:50:43,778 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434733058] [2020-12-23 06:50:43,778 INFO L461 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-12-23 06:50:43,779 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:43,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-12-23 06:50:43,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-12-23 06:50:43,780 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 48 states. [2020-12-23 06:50:45,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:45,286 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-12-23 06:50:45,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-12-23 06:50:45,287 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 50 [2020-12-23 06:50:45,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:45,287 INFO L225 Difference]: With dead ends: 56 [2020-12-23 06:50:45,288 INFO L226 Difference]: Without dead ends: 52 [2020-12-23 06:50:45,288 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-12-23 06:50:45,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-12-23 06:50:45,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-12-23 06:50:45,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-12-23 06:50:45,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-12-23 06:50:45,290 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-12-23 06:50:45,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:45,290 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-12-23 06:50:45,290 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-12-23 06:50:45,290 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-12-23 06:50:45,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-12-23 06:50:45,290 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:45,291 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:45,491 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2020-12-23 06:50:45,492 INFO L429 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:45,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:45,492 INFO L82 PathProgramCache]: Analyzing trace with hash -1231819568, now seen corresponding path program 45 times [2020-12-23 06:50:45,493 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:45,493 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308282252] [2020-12-23 06:50:45,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:45,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:47,235 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:47,235 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308282252] [2020-12-23 06:50:47,235 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [369132127] [2020-12-23 06:50:47,235 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 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:50:48,643 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2020-12-23 06:50:48,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:50:48,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 101 conjunts are in the unsatisfiable core [2020-12-23 06:50:48,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:49,338 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:49,339 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:49,339 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48] total 49 [2020-12-23 06:50:49,339 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462630064] [2020-12-23 06:50:49,339 INFO L461 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-12-23 06:50:49,339 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:49,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-12-23 06:50:49,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-12-23 06:50:49,340 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 49 states. [2020-12-23 06:50:50,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:50,960 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-12-23 06:50:50,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-12-23 06:50:50,960 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 51 [2020-12-23 06:50:50,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:50,961 INFO L225 Difference]: With dead ends: 57 [2020-12-23 06:50:50,961 INFO L226 Difference]: Without dead ends: 53 [2020-12-23 06:50:50,962 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 43 SyntacticMatches, 8 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-12-23 06:50:50,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-12-23 06:50:50,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-12-23 06:50:50,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-12-23 06:50:50,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-12-23 06:50:50,965 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-12-23 06:50:50,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:50,965 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-12-23 06:50:50,965 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-12-23 06:50:50,965 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-12-23 06:50:50,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-12-23 06:50:50,966 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:50,966 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:51,166 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2020-12-23 06:50:51,167 INFO L429 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:51,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:51,168 INFO L82 PathProgramCache]: Analyzing trace with hash 469964427, now seen corresponding path program 46 times [2020-12-23 06:50:51,168 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:51,168 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1995797412] [2020-12-23 06:50:51,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:51,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:53,033 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:53,034 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1995797412] [2020-12-23 06:50:53,034 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [445268462] [2020-12-23 06:50:53,034 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 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:50:53,110 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:50:53,110 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:50:53,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 95 conjunts are in the unsatisfiable core [2020-12-23 06:50:53,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:53,256 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:53,257 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:53,257 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 50 [2020-12-23 06:50:53,257 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003009491] [2020-12-23 06:50:53,258 INFO L461 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-12-23 06:50:53,258 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:53,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-12-23 06:50:53,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-12-23 06:50:53,259 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 50 states. [2020-12-23 06:50:54,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:54,807 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-12-23 06:50:54,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-12-23 06:50:54,808 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 52 [2020-12-23 06:50:54,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:54,809 INFO L225 Difference]: With dead ends: 58 [2020-12-23 06:50:54,809 INFO L226 Difference]: Without dead ends: 54 [2020-12-23 06:50:54,809 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-12-23 06:50:54,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-12-23 06:50:54,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-12-23 06:50:54,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-12-23 06:50:54,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-12-23 06:50:54,812 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-12-23 06:50:54,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:54,813 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-12-23 06:50:54,813 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-12-23 06:50:54,813 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-12-23 06:50:54,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-12-23 06:50:54,813 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:54,813 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:55,019 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2020-12-23 06:50:55,020 INFO L429 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:55,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:55,021 INFO L82 PathProgramCache]: Analyzing trace with hash 1685660720, now seen corresponding path program 47 times [2020-12-23 06:50:55,021 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:55,021 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1779544547] [2020-12-23 06:50:55,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:55,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:56,985 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:56,985 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1779544547] [2020-12-23 06:50:56,986 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [611667487] [2020-12-23 06:50:56,986 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 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:05,275 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2020-12-23 06:52:05,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:52:05,292 WARN L261 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 139 conjunts are in the unsatisfiable core [2020-12-23 06:52:05,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:07,516 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:07,516 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:07,516 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50] total 51 [2020-12-23 06:52:07,517 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651363918] [2020-12-23 06:52:07,517 INFO L461 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-12-23 06:52:07,517 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:07,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-12-23 06:52:07,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=2403, Unknown=0, NotChecked=0, Total=2550 [2020-12-23 06:52:07,518 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 51 states. [2020-12-23 06:52:09,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:09,240 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-12-23 06:52:09,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-12-23 06:52:09,240 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 53 [2020-12-23 06:52:09,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:09,241 INFO L225 Difference]: With dead ends: 59 [2020-12-23 06:52:09,241 INFO L226 Difference]: Without dead ends: 55 [2020-12-23 06:52:09,242 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 11 SyntacticMatches, 42 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=147, Invalid=2403, Unknown=0, NotChecked=0, Total=2550 [2020-12-23 06:52:09,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-12-23 06:52:09,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-12-23 06:52:09,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-12-23 06:52:09,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-12-23 06:52:09,245 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-12-23 06:52:09,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:09,245 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-12-23 06:52:09,245 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-12-23 06:52:09,245 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-12-23 06:52:09,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-12-23 06:52:09,245 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:09,245 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:09,446 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:09,446 INFO L429 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:09,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:09,447 INFO L82 PathProgramCache]: Analyzing trace with hash 717540139, now seen corresponding path program 48 times [2020-12-23 06:52:09,447 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:09,447 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1593632771] [2020-12-23 06:52:09,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:09,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:11,392 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:11,393 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1593632771] [2020-12-23 06:52:11,393 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1448207590] [2020-12-23 06:52:11,393 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 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:20,424 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2020-12-23 06:52:20,424 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:52:20,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 125 conjunts are in the unsatisfiable core [2020-12-23 06:52:20,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:22,111 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:22,112 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:22,112 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51] total 52 [2020-12-23 06:52:22,112 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675767543] [2020-12-23 06:52:22,112 INFO L461 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-12-23 06:52:22,113 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:22,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-12-23 06:52:22,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=2502, Unknown=0, NotChecked=0, Total=2652 [2020-12-23 06:52:22,113 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 52 states. [2020-12-23 06:52:23,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:23,885 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-12-23 06:52:23,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-12-23 06:52:23,886 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 54 [2020-12-23 06:52:23,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:23,887 INFO L225 Difference]: With dead ends: 60 [2020-12-23 06:52:23,887 INFO L226 Difference]: Without dead ends: 56 [2020-12-23 06:52:23,888 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 28 SyntacticMatches, 26 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=150, Invalid=2502, Unknown=0, NotChecked=0, Total=2652 [2020-12-23 06:52:23,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-12-23 06:52:23,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-12-23 06:52:23,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-12-23 06:52:23,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-12-23 06:52:23,891 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-12-23 06:52:23,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:23,891 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-12-23 06:52:23,891 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-12-23 06:52:23,891 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-12-23 06:52:23,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-12-23 06:52:23,891 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:23,892 INFO L422 BasicCegarLoop]: trace histogram [49, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:24,092 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2020-12-23 06:52:24,093 INFO L429 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:24,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:24,093 INFO L82 PathProgramCache]: Analyzing trace with hash 770573200, now seen corresponding path program 49 times [2020-12-23 06:52:24,094 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:24,094 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622031824] [2020-12-23 06:52:24,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:24,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:26,201 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:26,202 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [622031824] [2020-12-23 06:52:26,202 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [764855893] [2020-12-23 06:52:26,202 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 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:26,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:26,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 101 conjunts are in the unsatisfiable core [2020-12-23 06:52:26,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:26,454 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:26,454 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:26,454 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52] total 53 [2020-12-23 06:52:26,454 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2030192874] [2020-12-23 06:52:26,454 INFO L461 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-12-23 06:52:26,455 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:26,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-12-23 06:52:26,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=2603, Unknown=0, NotChecked=0, Total=2756 [2020-12-23 06:52:26,455 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 53 states. [2020-12-23 06:52:28,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:28,342 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-12-23 06:52:28,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-12-23 06:52:28,343 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 55 [2020-12-23 06:52:28,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:28,344 INFO L225 Difference]: With dead ends: 61 [2020-12-23 06:52:28,344 INFO L226 Difference]: Without dead ends: 57 [2020-12-23 06:52:28,345 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=153, Invalid=2603, Unknown=0, NotChecked=0, Total=2756 [2020-12-23 06:52:28,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-12-23 06:52:28,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-12-23 06:52:28,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-12-23 06:52:28,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-12-23 06:52:28,347 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-12-23 06:52:28,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:28,348 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-12-23 06:52:28,348 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-12-23 06:52:28,348 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-12-23 06:52:28,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-12-23 06:52:28,348 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:28,348 INFO L422 BasicCegarLoop]: trace histogram [50, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:28,554 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2020-12-23 06:52:28,555 INFO L429 AbstractCegarLoop]: === Iteration 51 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:28,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:28,556 INFO L82 PathProgramCache]: Analyzing trace with hash -1880369205, now seen corresponding path program 50 times [2020-12-23 06:52:28,556 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:28,556 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1821344729] [2020-12-23 06:52:28,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:28,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:30,777 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:30,777 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1821344729] [2020-12-23 06:52:30,778 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1985320165] [2020-12-23 06:52:30,778 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 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:30,860 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:52:30,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:52:30,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 103 conjunts are in the unsatisfiable core [2020-12-23 06:52:30,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:31,029 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:31,029 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:31,029 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53] total 54 [2020-12-23 06:52:31,029 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308528039] [2020-12-23 06:52:31,030 INFO L461 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-12-23 06:52:31,030 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:31,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-12-23 06:52:31,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=2706, Unknown=0, NotChecked=0, Total=2862 [2020-12-23 06:52:31,030 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 54 states. [2020-12-23 06:52:33,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:33,003 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-12-23 06:52:33,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-12-23 06:52:33,004 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 56 [2020-12-23 06:52:33,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:33,005 INFO L225 Difference]: With dead ends: 62 [2020-12-23 06:52:33,005 INFO L226 Difference]: Without dead ends: 58 [2020-12-23 06:52:33,006 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=156, Invalid=2706, Unknown=0, NotChecked=0, Total=2862 [2020-12-23 06:52:33,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-12-23 06:52:33,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-12-23 06:52:33,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-12-23 06:52:33,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-12-23 06:52:33,009 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-12-23 06:52:33,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:33,009 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-12-23 06:52:33,009 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-12-23 06:52:33,009 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-12-23 06:52:33,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-12-23 06:52:33,010 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:33,010 INFO L422 BasicCegarLoop]: trace histogram [51, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:33,219 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:33,220 INFO L429 AbstractCegarLoop]: === Iteration 52 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:33,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:33,221 INFO L82 PathProgramCache]: Analyzing trace with hash 1839762160, now seen corresponding path program 51 times [2020-12-23 06:52:33,221 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:33,221 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1681762532] [2020-12-23 06:52:33,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:33,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:35,544 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:35,544 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1681762532] [2020-12-23 06:52:35,544 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1516702738] [2020-12-23 06:52:35,545 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 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:39,974 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2020-12-23 06:52:39,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:52:39,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 111 conjunts are in the unsatisfiable core [2020-12-23 06:52:39,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:40,637 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:40,637 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:40,637 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54] total 55 [2020-12-23 06:52:40,637 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498201713] [2020-12-23 06:52:40,638 INFO L461 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-12-23 06:52:40,638 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:40,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-12-23 06:52:40,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=2811, Unknown=0, NotChecked=0, Total=2970 [2020-12-23 06:52:40,639 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 55 states. [2020-12-23 06:52:42,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:42,668 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-12-23 06:52:42,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-12-23 06:52:42,670 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 57 [2020-12-23 06:52:42,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:42,670 INFO L225 Difference]: With dead ends: 63 [2020-12-23 06:52:42,671 INFO L226 Difference]: Without dead ends: 59 [2020-12-23 06:52:42,672 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 51 SyntacticMatches, 6 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=159, Invalid=2811, Unknown=0, NotChecked=0, Total=2970 [2020-12-23 06:52:42,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-12-23 06:52:42,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-12-23 06:52:42,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-12-23 06:52:42,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-12-23 06:52:42,676 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-12-23 06:52:42,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:42,676 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-12-23 06:52:42,676 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-12-23 06:52:42,676 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-12-23 06:52:42,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-12-23 06:52:42,676 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:42,677 INFO L422 BasicCegarLoop]: trace histogram [52, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:42,881 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2020-12-23 06:52:42,882 INFO L429 AbstractCegarLoop]: === Iteration 53 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:42,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:42,882 INFO L82 PathProgramCache]: Analyzing trace with hash 1199717483, now seen corresponding path program 52 times [2020-12-23 06:52:42,883 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:42,883 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1150930786] [2020-12-23 06:52:42,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:42,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat