/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/functions_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-dcfa08f [2020-12-23 06:50:18,940 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-23 06:50:18,942 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-23 06:50:18,977 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-23 06:50:18,978 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-23 06:50:18,979 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-23 06:50:18,981 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-23 06:50:18,983 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-23 06:50:18,985 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-23 06:50:18,986 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-23 06:50:18,987 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-23 06:50:18,989 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-23 06:50:18,989 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-23 06:50:18,990 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-23 06:50:18,992 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-23 06:50:18,993 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-23 06:50:18,994 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-23 06:50:18,995 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-23 06:50:18,997 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-23 06:50:18,999 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-23 06:50:19,001 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-23 06:50:19,004 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-23 06:50:19,006 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-23 06:50:19,007 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-23 06:50:19,022 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-23 06:50:19,035 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 06:50:19,068 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-23 06:50:19,068 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-23 06:50:19,070 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-23 06:50:19,071 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-23 06:50:19,071 INFO L138 SettingsManager]: * Use SBE=true [2020-12-23 06:50:19,072 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-23 06:50:19,073 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-23 06:50:19,073 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-23 06:50:19,073 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-23 06:50:19,073 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-23 06:50:19,074 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-23 06:50:19,074 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-23 06:50:19,075 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-23 06:50:19,075 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-23 06:50:19,075 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-23 06:50:19,076 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-23 06:50:19,076 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-23 06:50:19,076 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 06:50:19,076 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-23 06:50:19,076 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-23 06:50:19,077 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-23 06:50:19,077 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-23 06:50:19,077 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-23 06:50:19,077 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-23 06:50:19,077 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-23 06:50:19,078 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-23 06:50:19,512 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-23 06:50:19,551 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-23 06:50:19,554 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-23 06:50:19,555 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-23 06:50:19,558 INFO L275 PluginConnector]: CDTParser initialized [2020-12-23 06:50:19,559 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-acceleration/functions_1-1.c [2020-12-23 06:50:19,650 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/d6eb68992/c2f7e282d526448cba8d1244528cf43e/FLAG462478e31 [2020-12-23 06:50:20,211 INFO L306 CDTParser]: Found 1 translation units. [2020-12-23 06:50:20,212 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loop-acceleration/functions_1-1.c [2020-12-23 06:50:20,218 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/d6eb68992/c2f7e282d526448cba8d1244528cf43e/FLAG462478e31 [2020-12-23 06:50:20,560 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/d6eb68992/c2f7e282d526448cba8d1244528cf43e [2020-12-23 06:50:20,563 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-23 06:50:20,565 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-23 06:50:20,568 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-23 06:50:20,568 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-23 06:50:20,572 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-23 06:50:20,574 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 06:50:20" (1/1) ... [2020-12-23 06:50:20,576 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@24290e71 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:50:20, skipping insertion in model container [2020-12-23 06:50:20,577 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 06:50:20" (1/1) ... [2020-12-23 06:50:20,586 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-23 06:50:20,604 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-23 06:50:20,786 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/functions_1-1.c[325,338] left hand side expression in assignment: lhs: VariableLHS[~x~0,] [2020-12-23 06:50:20,800 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 06:50:20,810 INFO L203 MainTranslator]: Completed pre-run [2020-12-23 06:50:20,822 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/functions_1-1.c[325,338] left hand side expression in assignment: lhs: VariableLHS[~x~0,] [2020-12-23 06:50:20,825 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 06:50:20,839 INFO L208 MainTranslator]: Completed translation [2020-12-23 06:50:20,839 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:50:20 WrapperNode [2020-12-23 06:50:20,839 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-23 06:50:20,841 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-23 06:50:20,841 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-23 06:50:20,841 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-23 06:50:20,849 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:50:20" (1/1) ... [2020-12-23 06:50:20,857 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:50:20" (1/1) ... [2020-12-23 06:50:20,875 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-23 06:50:20,876 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-23 06:50:20,876 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-23 06:50:20,877 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-23 06:50:20,885 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:50:20" (1/1) ... [2020-12-23 06:50:20,886 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:50:20" (1/1) ... [2020-12-23 06:50:20,887 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:50:20" (1/1) ... [2020-12-23 06:50:20,888 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:50:20" (1/1) ... [2020-12-23 06:50:20,891 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:50:20" (1/1) ... [2020-12-23 06:50:20,895 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:50:20" (1/1) ... [2020-12-23 06:50:20,896 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:50:20" (1/1) ... [2020-12-23 06:50:20,898 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-23 06:50:20,899 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-23 06:50:20,899 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-23 06:50:20,899 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-23 06:50:20,900 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:50:20" (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 06:50:20,994 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-23 06:50:20,995 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-23 06:50:20,995 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-23 06:50:20,995 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-23 06:50:21,211 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-23 06:50:21,211 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2020-12-23 06:50:21,213 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 06:50:21 BoogieIcfgContainer [2020-12-23 06:50:21,217 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-23 06:50:21,219 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-23 06:50:21,220 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-23 06:50:21,224 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-23 06:50:21,226 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.12 06:50:20" (1/3) ... [2020-12-23 06:50:21,227 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57403c85 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 06:50:21, skipping insertion in model container [2020-12-23 06:50:21,228 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:50:20" (2/3) ... [2020-12-23 06:50:21,229 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57403c85 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 06:50:21, skipping insertion in model container [2020-12-23 06:50:21,229 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 06:50:21" (3/3) ... [2020-12-23 06:50:21,232 INFO L111 eAbstractionObserver]: Analyzing ICFG functions_1-1.c [2020-12-23 06:50:21,241 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-23 06:50:21,246 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-23 06:50:21,270 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-23 06:50:21,318 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-23 06:50:21,318 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-23 06:50:21,318 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-23 06:50:21,318 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-23 06:50:21,318 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-23 06:50:21,319 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-23 06:50:21,319 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-23 06:50:21,319 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-23 06:50:21,361 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states. [2020-12-23 06:50:21,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-23 06:50:21,367 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:21,368 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-12-23 06:50:21,368 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:21,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:21,383 INFO L82 PathProgramCache]: Analyzing trace with hash 889635821, now seen corresponding path program 1 times [2020-12-23 06:50:21,394 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:21,394 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1494418829] [2020-12-23 06:50:21,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:21,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:21,730 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 06:50:21,731 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1494418829] [2020-12-23 06:50:21,732 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 06:50:21,732 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-23 06:50:21,733 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999207546] [2020-12-23 06:50:21,746 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-23 06:50:21,746 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:21,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-23 06:50:21,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-23 06:50:21,780 INFO L87 Difference]: Start difference. First operand 11 states. Second operand 3 states. [2020-12-23 06:50:21,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:21,820 INFO L93 Difference]: Finished difference Result 20 states and 24 transitions. [2020-12-23 06:50:21,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-23 06:50:21,822 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2020-12-23 06:50:21,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:21,831 INFO L225 Difference]: With dead ends: 20 [2020-12-23 06:50:21,831 INFO L226 Difference]: Without dead ends: 10 [2020-12-23 06:50:21,834 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 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 06:50:21,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2020-12-23 06:50:21,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 9. [2020-12-23 06:50:21,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-12-23 06:50:21,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2020-12-23 06:50:21,876 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2020-12-23 06:50:21,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:21,877 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2020-12-23 06:50:21,877 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-23 06:50:21,877 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2020-12-23 06:50:21,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-23 06:50:21,877 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:21,878 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:21,878 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-23 06:50:21,878 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:21,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:21,879 INFO L82 PathProgramCache]: Analyzing trace with hash 294764431, now seen corresponding path program 1 times [2020-12-23 06:50:21,879 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:21,880 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618533462] [2020-12-23 06:50:21,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:21,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:21,994 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 06:50:21,995 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618533462] [2020-12-23 06:50:21,996 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [51802956] [2020-12-23 06:50:21,996 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 06:50:22,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:22,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-23 06:50:22,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:22,132 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 06:50:22,133 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:22,133 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-23 06:50:22,134 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507781779] [2020-12-23 06:50:22,135 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 06:50:22,135 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:22,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 06:50:22,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-12-23 06:50:22,137 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 6 states. [2020-12-23 06:50:22,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:22,185 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2020-12-23 06:50:22,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-23 06:50:22,186 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 8 [2020-12-23 06:50:22,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:22,186 INFO L225 Difference]: With dead ends: 16 [2020-12-23 06:50:22,186 INFO L226 Difference]: Without dead ends: 12 [2020-12-23 06:50:22,188 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2020-12-23 06:50:22,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-12-23 06:50:22,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2020-12-23 06:50:22,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-12-23 06:50:22,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2020-12-23 06:50:22,191 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2020-12-23 06:50:22,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:22,192 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2020-12-23 06:50:22,192 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 06:50:22,192 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2020-12-23 06:50:22,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-23 06:50:22,193 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:22,193 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:22,408 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-23 06:50:22,409 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:22,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:22,410 INFO L82 PathProgramCache]: Analyzing trace with hash -145990991, now seen corresponding path program 2 times [2020-12-23 06:50:22,410 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:22,410 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [807861617] [2020-12-23 06:50:22,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:22,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:22,529 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:22,530 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [807861617] [2020-12-23 06:50:22,530 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [127832506] [2020-12-23 06:50:22,531 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 06:50:22,582 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:50:22,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:50:22,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-23 06:50:22,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:22,637 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:22,637 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:22,637 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-23 06:50:22,638 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647696960] [2020-12-23 06:50:22,638 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-23 06:50:22,639 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:22,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-23 06:50:22,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-12-23 06:50:22,640 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 8 states. [2020-12-23 06:50:22,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:22,725 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-12-23 06:50:22,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-23 06:50:22,726 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 10 [2020-12-23 06:50:22,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:22,726 INFO L225 Difference]: With dead ends: 18 [2020-12-23 06:50:22,727 INFO L226 Difference]: Without dead ends: 14 [2020-12-23 06:50:22,727 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2020-12-23 06:50:22,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-12-23 06:50:22,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2020-12-23 06:50:22,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-12-23 06:50:22,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-12-23 06:50:22,732 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2020-12-23 06:50:22,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:22,732 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-12-23 06:50:22,733 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-23 06:50:22,733 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-12-23 06:50:22,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-23 06:50:22,733 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:22,733 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:22,946 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:50:22,947 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:22,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:22,948 INFO L82 PathProgramCache]: Analyzing trace with hash 1489810771, now seen corresponding path program 3 times [2020-12-23 06:50:22,948 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:22,948 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141572083] [2020-12-23 06:50:22,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:22,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:23,087 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:23,087 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141572083] [2020-12-23 06:50:23,088 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [596333883] [2020-12-23 06:50:23,088 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 06:50:23,161 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-12-23 06:50:23,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:50:23,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 27 conjunts are in the unsatisfiable core [2020-12-23 06:50:23,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:23,213 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:23,214 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:23,214 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-23 06:50:23,215 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000171171] [2020-12-23 06:50:23,215 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-23 06:50:23,215 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:23,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-23 06:50:23,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-12-23 06:50:23,217 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 10 states. [2020-12-23 06:50:23,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:23,335 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-12-23 06:50:23,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-23 06:50:23,336 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 12 [2020-12-23 06:50:23,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:23,336 INFO L225 Difference]: With dead ends: 20 [2020-12-23 06:50:23,336 INFO L226 Difference]: Without dead ends: 16 [2020-12-23 06:50:23,337 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2020-12-23 06:50:23,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-12-23 06:50:23,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-12-23 06:50:23,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-12-23 06:50:23,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-12-23 06:50:23,342 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-12-23 06:50:23,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:23,342 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-12-23 06:50:23,342 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-23 06:50:23,342 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-12-23 06:50:23,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-12-23 06:50:23,343 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:23,343 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:23,557 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:50:23,558 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:23,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:23,560 INFO L82 PathProgramCache]: Analyzing trace with hash 1537273717, now seen corresponding path program 4 times [2020-12-23 06:50:23,560 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:23,561 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402082192] [2020-12-23 06:50:23,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:23,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:23,708 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:23,708 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1402082192] [2020-12-23 06:50:23,709 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1998911847] [2020-12-23 06:50:23,709 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 06:50:23,750 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:50:23,750 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:50:23,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 35 conjunts are in the unsatisfiable core [2020-12-23 06:50:23,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:23,801 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:23,802 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:23,802 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-23 06:50:23,802 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513086690] [2020-12-23 06:50:23,803 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-23 06:50:23,803 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:23,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-23 06:50:23,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2020-12-23 06:50:23,804 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 12 states. [2020-12-23 06:50:23,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:23,984 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-12-23 06:50:23,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-23 06:50:23,985 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 14 [2020-12-23 06:50:23,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:23,985 INFO L225 Difference]: With dead ends: 22 [2020-12-23 06:50:23,986 INFO L226 Difference]: Without dead ends: 18 [2020-12-23 06:50:23,986 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=314, Unknown=0, NotChecked=0, Total=380 [2020-12-23 06:50:23,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-12-23 06:50:23,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-12-23 06:50:23,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-23 06:50:23,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-12-23 06:50:23,991 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2020-12-23 06:50:23,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:23,991 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-12-23 06:50:23,992 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-23 06:50:23,992 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-12-23 06:50:23,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-23 06:50:23,993 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:23,993 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:24,207 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:50:24,208 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:24,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:24,210 INFO L82 PathProgramCache]: Analyzing trace with hash -95475433, now seen corresponding path program 5 times [2020-12-23 06:50:24,210 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:24,211 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1480680066] [2020-12-23 06:50:24,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:24,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:24,472 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:24,473 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1480680066] [2020-12-23 06:50:24,474 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [919255374] [2020-12-23 06:50:24,474 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 06:50:24,540 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-12-23 06:50:24,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:50:24,542 WARN L261 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 43 conjunts are in the unsatisfiable core [2020-12-23 06:50:24,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:24,609 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:24,609 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:24,610 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-12-23 06:50:24,610 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260974746] [2020-12-23 06:50:24,610 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-23 06:50:24,611 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:24,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-23 06:50:24,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2020-12-23 06:50:24,612 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 14 states. [2020-12-23 06:50:24,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:24,849 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-12-23 06:50:24,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-23 06:50:24,850 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 16 [2020-12-23 06:50:24,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:24,851 INFO L225 Difference]: With dead ends: 24 [2020-12-23 06:50:24,851 INFO L226 Difference]: Without dead ends: 20 [2020-12-23 06:50:24,852 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2020-12-23 06:50:24,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-23 06:50:24,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-12-23 06:50:24,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-23 06:50:24,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-12-23 06:50:24,856 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2020-12-23 06:50:24,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:24,857 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-12-23 06:50:24,857 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-23 06:50:24,857 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-12-23 06:50:24,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-12-23 06:50:24,858 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:24,858 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:25,071 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-23 06:50:25,071 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:25,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:25,073 INFO L82 PathProgramCache]: Analyzing trace with hash -1504345543, now seen corresponding path program 6 times [2020-12-23 06:50:25,073 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:25,074 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2060262992] [2020-12-23 06:50:25,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:25,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:25,328 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 06:50:25,329 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2060262992] [2020-12-23 06:50:25,329 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [163454034] [2020-12-23 06:50:25,329 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 06:50:25,415 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-23 06:50:25,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:50:25,422 WARN L261 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 58 conjunts are in the unsatisfiable core [2020-12-23 06:50:25,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:25,513 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-23 06:50:25,552 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 06:50:25,553 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:25,553 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16] total 17 [2020-12-23 06:50:25,553 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386350872] [2020-12-23 06:50:25,554 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-23 06:50:25,554 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:25,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-23 06:50:25,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=234, Unknown=0, NotChecked=0, Total=272 [2020-12-23 06:50:25,555 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 17 states. [2020-12-23 06:50:25,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:25,912 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-12-23 06:50:25,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-23 06:50:25,914 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 18 [2020-12-23 06:50:25,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:25,915 INFO L225 Difference]: With dead ends: 26 [2020-12-23 06:50:25,915 INFO L226 Difference]: Without dead ends: 22 [2020-12-23 06:50:25,916 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=98, Invalid=714, Unknown=0, NotChecked=0, Total=812 [2020-12-23 06:50:25,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-12-23 06:50:25,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-12-23 06:50:25,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-12-23 06:50:25,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-12-23 06:50:25,920 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2020-12-23 06:50:25,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:25,920 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-12-23 06:50:25,920 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-23 06:50:25,921 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-12-23 06:50:25,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-12-23 06:50:25,921 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:25,921 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:26,135 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:50:26,136 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:26,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:26,138 INFO L82 PathProgramCache]: Analyzing trace with hash 1781144283, now seen corresponding path program 7 times [2020-12-23 06:50:26,138 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:26,139 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [242775768] [2020-12-23 06:50:26,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:26,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:26,444 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:26,445 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [242775768] [2020-12-23 06:50:26,445 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2100836581] [2020-12-23 06:50:26,445 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 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 06:50:26,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:26,500 WARN L261 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 59 conjunts are in the unsatisfiable core [2020-12-23 06:50:26,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:26,573 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:26,573 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:26,573 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-23 06:50:26,574 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858947] [2020-12-23 06:50:26,574 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-23 06:50:26,574 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:26,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-23 06:50:26,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=265, Unknown=0, NotChecked=0, Total=306 [2020-12-23 06:50:26,576 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 18 states. [2020-12-23 06:50:27,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:27,021 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-12-23 06:50:27,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-23 06:50:27,022 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 20 [2020-12-23 06:50:27,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:27,025 INFO L225 Difference]: With dead ends: 28 [2020-12-23 06:50:27,026 INFO L226 Difference]: Without dead ends: 24 [2020-12-23 06:50:27,030 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=111, Invalid=881, Unknown=0, NotChecked=0, Total=992 [2020-12-23 06:50:27,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-12-23 06:50:27,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-12-23 06:50:27,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-23 06:50:27,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-12-23 06:50:27,039 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2020-12-23 06:50:27,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:27,040 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-12-23 06:50:27,040 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-23 06:50:27,040 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-12-23 06:50:27,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-12-23 06:50:27,042 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:27,042 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:27,256 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:50:27,257 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:27,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:27,258 INFO L82 PathProgramCache]: Analyzing trace with hash -1959062787, now seen corresponding path program 8 times [2020-12-23 06:50:27,259 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:27,260 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [617910169] [2020-12-23 06:50:27,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:27,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:27,610 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:27,610 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [617910169] [2020-12-23 06:50:27,610 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [494863603] [2020-12-23 06:50:27,611 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 06:50:27,672 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:50:27,672 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:50:27,674 WARN L261 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 67 conjunts are in the unsatisfiable core [2020-12-23 06:50:27,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:27,797 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:27,797 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:27,797 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-12-23 06:50:27,800 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791603112] [2020-12-23 06:50:27,801 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-23 06:50:27,801 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:27,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-23 06:50:27,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=334, Unknown=0, NotChecked=0, Total=380 [2020-12-23 06:50:27,802 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 20 states. [2020-12-23 06:50:28,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:28,324 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-12-23 06:50:28,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-23 06:50:28,325 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 22 [2020-12-23 06:50:28,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:28,326 INFO L225 Difference]: With dead ends: 30 [2020-12-23 06:50:28,326 INFO L226 Difference]: Without dead ends: 26 [2020-12-23 06:50:28,327 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=126, Invalid=1134, Unknown=0, NotChecked=0, Total=1260 [2020-12-23 06:50:28,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-12-23 06:50:28,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-12-23 06:50:28,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-12-23 06:50:28,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-12-23 06:50:28,333 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2020-12-23 06:50:28,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:28,333 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-12-23 06:50:28,333 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-23 06:50:28,334 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-12-23 06:50:28,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-23 06:50:28,334 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:28,335 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:28,549 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-23 06:50:28,550 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:28,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:28,551 INFO L82 PathProgramCache]: Analyzing trace with hash -1410430305, now seen corresponding path program 9 times [2020-12-23 06:50:28,552 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:28,552 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977930529] [2020-12-23 06:50:28,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:28,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:28,951 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:28,951 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977930529] [2020-12-23 06:50:28,952 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [97531368] [2020-12-23 06:50:28,952 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 06:50:29,081 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2020-12-23 06:50:29,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:50:29,084 WARN L261 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 75 conjunts are in the unsatisfiable core [2020-12-23 06:50:29,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:29,165 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:29,166 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:29,166 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-12-23 06:50:29,166 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555301339] [2020-12-23 06:50:29,167 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-12-23 06:50:29,167 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:29,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-12-23 06:50:29,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=411, Unknown=0, NotChecked=0, Total=462 [2020-12-23 06:50:29,168 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 22 states. [2020-12-23 06:50:29,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:29,858 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-12-23 06:50:29,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-12-23 06:50:29,859 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 24 [2020-12-23 06:50:29,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:29,859 INFO L225 Difference]: With dead ends: 32 [2020-12-23 06:50:29,860 INFO L226 Difference]: Without dead ends: 28 [2020-12-23 06:50:29,861 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=141, Invalid=1419, Unknown=0, NotChecked=0, Total=1560 [2020-12-23 06:50:29,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-12-23 06:50:29,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-12-23 06:50:29,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-12-23 06:50:29,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-12-23 06:50:29,866 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2020-12-23 06:50:29,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:29,866 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-12-23 06:50:29,867 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-12-23 06:50:29,867 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-12-23 06:50:29,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-12-23 06:50:29,867 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:29,868 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:30,081 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:50:30,083 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:30,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:30,084 INFO L82 PathProgramCache]: Analyzing trace with hash 1839374785, now seen corresponding path program 10 times [2020-12-23 06:50:30,084 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:30,085 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [682383720] [2020-12-23 06:50:30,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:30,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:30,576 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:30,576 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [682383720] [2020-12-23 06:50:30,576 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [148068723] [2020-12-23 06:50:30,577 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 06:50:30,640 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:50:30,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:50:30,643 WARN L261 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 83 conjunts are in the unsatisfiable core [2020-12-23 06:50:30,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:30,730 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:30,731 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:30,731 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-12-23 06:50:30,731 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480624518] [2020-12-23 06:50:30,732 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-23 06:50:30,732 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:30,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-23 06:50:30,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=496, Unknown=0, NotChecked=0, Total=552 [2020-12-23 06:50:30,733 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 24 states. [2020-12-23 06:50:31,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:31,576 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-12-23 06:50:31,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-12-23 06:50:31,576 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 26 [2020-12-23 06:50:31,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:31,577 INFO L225 Difference]: With dead ends: 34 [2020-12-23 06:50:31,577 INFO L226 Difference]: Without dead ends: 30 [2020-12-23 06:50:31,578 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=156, Invalid=1736, Unknown=0, NotChecked=0, Total=1892 [2020-12-23 06:50:31,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-12-23 06:50:31,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-12-23 06:50:31,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-12-23 06:50:31,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-12-23 06:50:31,584 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2020-12-23 06:50:31,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:31,584 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-12-23 06:50:31,584 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-23 06:50:31,584 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-12-23 06:50:31,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-12-23 06:50:31,585 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:31,585 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:31,787 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:50:31,788 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:31,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:31,790 INFO L82 PathProgramCache]: Analyzing trace with hash -1834125213, now seen corresponding path program 11 times [2020-12-23 06:50:31,792 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:31,795 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733855038] [2020-12-23 06:50:31,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:31,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:32,387 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:32,387 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733855038] [2020-12-23 06:50:32,388 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1120546816] [2020-12-23 06:50:32,388 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 06:50:32,697 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2020-12-23 06:50:32,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:50:32,700 WARN L261 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 94 conjunts are in the unsatisfiable core [2020-12-23 06:50:32,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:32,868 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:32,868 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:32,869 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2020-12-23 06:50:32,869 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240057866] [2020-12-23 06:50:32,869 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-12-23 06:50:32,869 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:32,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-12-23 06:50:32,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=589, Unknown=0, NotChecked=0, Total=650 [2020-12-23 06:50:32,871 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 26 states. [2020-12-23 06:50:33,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:33,768 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-12-23 06:50:33,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-12-23 06:50:33,768 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 28 [2020-12-23 06:50:33,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:33,769 INFO L225 Difference]: With dead ends: 36 [2020-12-23 06:50:33,769 INFO L226 Difference]: Without dead ends: 32 [2020-12-23 06:50:33,771 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 25 SyntacticMatches, 4 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=171, Invalid=2085, Unknown=0, NotChecked=0, Total=2256 [2020-12-23 06:50:33,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-23 06:50:33,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-12-23 06:50:33,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-12-23 06:50:33,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-12-23 06:50:33,776 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2020-12-23 06:50:33,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:33,776 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-12-23 06:50:33,776 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-12-23 06:50:33,776 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-12-23 06:50:33,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-12-23 06:50:33,777 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:33,777 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:33,981 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-23 06:50:33,981 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:33,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:33,983 INFO L82 PathProgramCache]: Analyzing trace with hash -1604505979, now seen corresponding path program 12 times [2020-12-23 06:50:33,983 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:33,984 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [414608453] [2020-12-23 06:50:33,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:34,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:34,706 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:34,706 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [414608453] [2020-12-23 06:50:34,706 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1794980209] [2020-12-23 06:50:34,706 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 06:50:35,031 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-12-23 06:50:35,031 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:50:35,034 WARN L261 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 106 conjunts are in the unsatisfiable core [2020-12-23 06:50:35,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:35,124 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-23 06:50:35,160 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:35,161 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:35,161 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 28] total 29 [2020-12-23 06:50:35,161 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524367512] [2020-12-23 06:50:35,162 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-12-23 06:50:35,162 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:35,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-12-23 06:50:35,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=744, Unknown=0, NotChecked=0, Total=812 [2020-12-23 06:50:35,163 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 29 states. [2020-12-23 06:50:36,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:36,375 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-12-23 06:50:36,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-12-23 06:50:36,375 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 30 [2020-12-23 06:50:36,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:36,376 INFO L225 Difference]: With dead ends: 38 [2020-12-23 06:50:36,376 INFO L226 Difference]: Without dead ends: 34 [2020-12-23 06:50:36,377 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=188, Invalid=2568, Unknown=0, NotChecked=0, Total=2756 [2020-12-23 06:50:36,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-12-23 06:50:36,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-12-23 06:50:36,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-12-23 06:50:36,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-12-23 06:50:36,382 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2020-12-23 06:50:36,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:36,383 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-12-23 06:50:36,383 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-12-23 06:50:36,383 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-12-23 06:50:36,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-12-23 06:50:36,384 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:36,384 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:36,587 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-23 06:50:36,587 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:36,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:36,588 INFO L82 PathProgramCache]: Analyzing trace with hash 16245799, now seen corresponding path program 13 times [2020-12-23 06:50:36,589 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:36,589 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [615634412] [2020-12-23 06:50:36,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:36,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:37,338 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:37,339 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [615634412] [2020-12-23 06:50:37,339 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1275365553] [2020-12-23 06:50:37,340 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 06:50:37,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:37,397 WARN L261 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 107 conjunts are in the unsatisfiable core [2020-12-23 06:50:37,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:37,506 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:37,507 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:37,507 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2020-12-23 06:50:37,507 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [150159879] [2020-12-23 06:50:37,507 INFO L461 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-12-23 06:50:37,507 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:37,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-12-23 06:50:37,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=799, Unknown=0, NotChecked=0, Total=870 [2020-12-23 06:50:37,509 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 30 states. [2020-12-23 06:50:38,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:38,771 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-12-23 06:50:38,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-12-23 06:50:38,775 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 32 [2020-12-23 06:50:38,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:38,775 INFO L225 Difference]: With dead ends: 40 [2020-12-23 06:50:38,775 INFO L226 Difference]: Without dead ends: 36 [2020-12-23 06:50:38,777 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=201, Invalid=2879, Unknown=0, NotChecked=0, Total=3080 [2020-12-23 06:50:38,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-23 06:50:38,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-12-23 06:50:38,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-12-23 06:50:38,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-12-23 06:50:38,782 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2020-12-23 06:50:38,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:38,782 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-12-23 06:50:38,782 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-12-23 06:50:38,782 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-12-23 06:50:38,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-12-23 06:50:38,783 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:38,783 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:38,997 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-23 06:50:38,998 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:38,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:38,999 INFO L82 PathProgramCache]: Analyzing trace with hash -1514423991, now seen corresponding path program 14 times [2020-12-23 06:50:38,999 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:39,000 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1027001593] [2020-12-23 06:50:39,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:39,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:39,806 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:39,807 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1027001593] [2020-12-23 06:50:39,807 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1061360754] [2020-12-23 06:50:39,807 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 06:50:39,868 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:50:39,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:50:39,871 WARN L261 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 115 conjunts are in the unsatisfiable core [2020-12-23 06:50:39,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:39,991 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:39,992 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:39,992 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 32 [2020-12-23 06:50:39,992 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203147025] [2020-12-23 06:50:39,992 INFO L461 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-12-23 06:50:39,992 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:39,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-12-23 06:50:39,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=916, Unknown=0, NotChecked=0, Total=992 [2020-12-23 06:50:39,994 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 32 states. [2020-12-23 06:50:41,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:41,429 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-12-23 06:50:41,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-12-23 06:50:41,430 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 34 [2020-12-23 06:50:41,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:41,431 INFO L225 Difference]: With dead ends: 42 [2020-12-23 06:50:41,431 INFO L226 Difference]: Without dead ends: 38 [2020-12-23 06:50:41,433 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=216, Invalid=3324, Unknown=0, NotChecked=0, Total=3540 [2020-12-23 06:50:41,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-12-23 06:50:41,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-12-23 06:50:41,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-12-23 06:50:41,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-12-23 06:50:41,440 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2020-12-23 06:50:41,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:41,440 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-12-23 06:50:41,441 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-12-23 06:50:41,441 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-12-23 06:50:41,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-23 06:50:41,441 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:41,441 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:41,656 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:50:41,657 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:41,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:41,658 INFO L82 PathProgramCache]: Analyzing trace with hash 685690347, now seen corresponding path program 15 times [2020-12-23 06:50:41,659 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:41,659 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478353216] [2020-12-23 06:50:41,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:41,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:42,550 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:42,550 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478353216] [2020-12-23 06:50:42,550 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1551191874] [2020-12-23 06:50:42,550 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 06:50:42,783 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2020-12-23 06:50:42,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:50:42,787 WARN L261 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 133 conjunts are in the unsatisfiable core [2020-12-23 06:50:42,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:43,017 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:43,017 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:43,017 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 34 [2020-12-23 06:50:43,018 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009067539] [2020-12-23 06:50:43,018 INFO L461 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-12-23 06:50:43,018 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:43,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-12-23 06:50:43,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1041, Unknown=0, NotChecked=0, Total=1122 [2020-12-23 06:50:43,019 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 34 states. [2020-12-23 06:50:44,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:44,644 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-12-23 06:50:44,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-12-23 06:50:44,645 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 36 [2020-12-23 06:50:44,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:44,646 INFO L225 Difference]: With dead ends: 44 [2020-12-23 06:50:44,646 INFO L226 Difference]: Without dead ends: 40 [2020-12-23 06:50:44,648 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 33 SyntacticMatches, 4 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 439 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=231, Invalid=3801, Unknown=0, NotChecked=0, Total=4032 [2020-12-23 06:50:44,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-12-23 06:50:44,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-12-23 06:50:44,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-12-23 06:50:44,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-12-23 06:50:44,671 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2020-12-23 06:50:44,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:44,672 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-12-23 06:50:44,672 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-12-23 06:50:44,672 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-12-23 06:50:44,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-12-23 06:50:44,673 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:44,673 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:44,880 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-23 06:50:44,881 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:44,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:44,881 INFO L82 PathProgramCache]: Analyzing trace with hash 1871659533, now seen corresponding path program 16 times [2020-12-23 06:50:44,881 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:44,882 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [948730167] [2020-12-23 06:50:44,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:44,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:45,942 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:45,943 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [948730167] [2020-12-23 06:50:45,943 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2090116682] [2020-12-23 06:50:45,943 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 06:50:46,003 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:50:46,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:50:46,006 WARN L261 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 131 conjunts are in the unsatisfiable core [2020-12-23 06:50:46,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:46,124 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:46,124 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:46,125 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 36 [2020-12-23 06:50:46,125 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192968335] [2020-12-23 06:50:46,125 INFO L461 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-12-23 06:50:46,125 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:46,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-12-23 06:50:46,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=1174, Unknown=0, NotChecked=0, Total=1260 [2020-12-23 06:50:46,126 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 36 states. [2020-12-23 06:50:47,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:47,865 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-12-23 06:50:47,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-12-23 06:50:47,865 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 38 [2020-12-23 06:50:47,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:47,866 INFO L225 Difference]: With dead ends: 46 [2020-12-23 06:50:47,866 INFO L226 Difference]: Without dead ends: 42 [2020-12-23 06:50:47,868 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 498 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=246, Invalid=4310, Unknown=0, NotChecked=0, Total=4556 [2020-12-23 06:50:47,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-12-23 06:50:47,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-12-23 06:50:47,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-12-23 06:50:47,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-12-23 06:50:47,873 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2020-12-23 06:50:47,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:47,873 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-12-23 06:50:47,873 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-12-23 06:50:47,873 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-12-23 06:50:47,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-12-23 06:50:47,874 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:47,874 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:48,089 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-23 06:50:48,090 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:48,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:48,091 INFO L82 PathProgramCache]: Analyzing trace with hash -873253457, now seen corresponding path program 17 times [2020-12-23 06:50:48,092 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:48,092 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615875281] [2020-12-23 06:50:48,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:48,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:49,193 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:49,193 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615875281] [2020-12-23 06:50:49,194 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2034177280] [2020-12-23 06:50:49,194 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 06:50:50,011 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2020-12-23 06:50:50,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:50:50,016 WARN L261 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 151 conjunts are in the unsatisfiable core [2020-12-23 06:50:50,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:50,608 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:50,609 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:50,609 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 38 [2020-12-23 06:50:50,609 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737440185] [2020-12-23 06:50:50,609 INFO L461 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-12-23 06:50:50,610 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:50,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-12-23 06:50:50,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=1315, Unknown=0, NotChecked=0, Total=1406 [2020-12-23 06:50:50,611 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 38 states. [2020-12-23 06:50:52,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:52,599 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-12-23 06:50:52,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-12-23 06:50:52,600 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 40 [2020-12-23 06:50:52,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:52,601 INFO L225 Difference]: With dead ends: 48 [2020-12-23 06:50:52,601 INFO L226 Difference]: Without dead ends: 44 [2020-12-23 06:50:52,603 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 28 SyntacticMatches, 13 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 575 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=261, Invalid=4851, Unknown=0, NotChecked=0, Total=5112 [2020-12-23 06:50:52,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-12-23 06:50:52,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-12-23 06:50:52,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-12-23 06:50:52,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-12-23 06:50:52,607 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2020-12-23 06:50:52,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:52,607 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-12-23 06:50:52,607 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-12-23 06:50:52,607 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-12-23 06:50:52,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-12-23 06:50:52,608 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:52,608 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:52,809 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-23 06:50:52,809 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:52,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:52,810 INFO L82 PathProgramCache]: Analyzing trace with hash -1624717103, now seen corresponding path program 18 times [2020-12-23 06:50:52,811 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:52,811 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893430155] [2020-12-23 06:50:52,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:52,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:54,043 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:54,044 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893430155] [2020-12-23 06:50:54,044 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2056365661] [2020-12-23 06:50:54,044 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 06:50:54,783 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2020-12-23 06:50:54,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:50:54,788 WARN L261 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 151 conjunts are in the unsatisfiable core [2020-12-23 06:50:54,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:55,120 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:55,121 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:55,121 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39] total 40 [2020-12-23 06:50:55,121 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592126616] [2020-12-23 06:50:55,122 INFO L461 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-12-23 06:50:55,122 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:55,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-12-23 06:50:55,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1464, Unknown=0, NotChecked=0, Total=1560 [2020-12-23 06:50:55,123 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 40 states. [2020-12-23 06:50:57,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:50:57,384 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-12-23 06:50:57,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-12-23 06:50:57,385 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 42 [2020-12-23 06:50:57,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:50:57,386 INFO L225 Difference]: With dead ends: 50 [2020-12-23 06:50:57,386 INFO L226 Difference]: Without dead ends: 46 [2020-12-23 06:50:57,388 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 38 SyntacticMatches, 5 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 636 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=276, Invalid=5424, Unknown=0, NotChecked=0, Total=5700 [2020-12-23 06:50:57,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-12-23 06:50:57,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-12-23 06:50:57,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-12-23 06:50:57,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-12-23 06:50:57,393 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2020-12-23 06:50:57,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:50:57,393 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-12-23 06:50:57,393 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-12-23 06:50:57,394 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-12-23 06:50:57,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-12-23 06:50:57,394 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:50:57,394 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1] [2020-12-23 06:50:57,599 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:50:57,600 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:50:57,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:50:57,601 INFO L82 PathProgramCache]: Analyzing trace with hash 2068192115, now seen corresponding path program 19 times [2020-12-23 06:50:57,601 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:50:57,602 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [381850090] [2020-12-23 06:50:57,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:50:57,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:59,008 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:59,008 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [381850090] [2020-12-23 06:50:59,008 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1987053889] [2020-12-23 06:50:59,008 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 06:50:59,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:50:59,076 WARN L261 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 155 conjunts are in the unsatisfiable core [2020-12-23 06:50:59,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:50:59,217 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:50:59,217 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:50:59,217 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41] total 42 [2020-12-23 06:50:59,217 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315848879] [2020-12-23 06:50:59,218 INFO L461 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-12-23 06:50:59,218 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:50:59,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-12-23 06:50:59,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1621, Unknown=0, NotChecked=0, Total=1722 [2020-12-23 06:50:59,219 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 42 states. [2020-12-23 06:51:01,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:51:01,732 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-12-23 06:51:01,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-12-23 06:51:01,733 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 44 [2020-12-23 06:51:01,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:51:01,734 INFO L225 Difference]: With dead ends: 52 [2020-12-23 06:51:01,734 INFO L226 Difference]: Without dead ends: 48 [2020-12-23 06:51:01,736 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 705 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=291, Invalid=6029, Unknown=0, NotChecked=0, Total=6320 [2020-12-23 06:51:01,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-12-23 06:51:01,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-12-23 06:51:01,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-12-23 06:51:01,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-12-23 06:51:01,741 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2020-12-23 06:51:01,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:51:01,741 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-12-23 06:51:01,742 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-12-23 06:51:01,742 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-12-23 06:51:01,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-12-23 06:51:01,742 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:51:01,743 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1] [2020-12-23 06:51:01,955 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:51:01,956 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:51:01,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:51:01,957 INFO L82 PathProgramCache]: Analyzing trace with hash -984003179, now seen corresponding path program 20 times [2020-12-23 06:51:01,957 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:51:01,957 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1426585765] [2020-12-23 06:51:01,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:51:01,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:51:03,361 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:51:03,361 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1426585765] [2020-12-23 06:51:03,361 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [538700556] [2020-12-23 06:51:03,361 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 06:51:03,434 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:51:03,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:51:03,437 WARN L261 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 163 conjunts are in the unsatisfiable core [2020-12-23 06:51:03,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:51:03,579 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:51:03,579 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:51:03,579 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43] total 44 [2020-12-23 06:51:03,579 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110764192] [2020-12-23 06:51:03,580 INFO L461 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-12-23 06:51:03,580 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:51:03,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-12-23 06:51:03,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1786, Unknown=0, NotChecked=0, Total=1892 [2020-12-23 06:51:03,581 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 44 states. [2020-12-23 06:51:06,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:51:06,341 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-12-23 06:51:06,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-12-23 06:51:06,342 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 46 [2020-12-23 06:51:06,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:51:06,343 INFO L225 Difference]: With dead ends: 54 [2020-12-23 06:51:06,343 INFO L226 Difference]: Without dead ends: 50 [2020-12-23 06:51:06,346 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 782 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=306, Invalid=6666, Unknown=0, NotChecked=0, Total=6972 [2020-12-23 06:51:06,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-12-23 06:51:06,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-12-23 06:51:06,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-12-23 06:51:06,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-12-23 06:51:06,350 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2020-12-23 06:51:06,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:51:06,350 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-12-23 06:51:06,350 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-12-23 06:51:06,350 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-12-23 06:51:06,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-12-23 06:51:06,351 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:51:06,351 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1] [2020-12-23 06:51:06,554 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2020-12-23 06:51:06,555 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:51:06,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:51:06,556 INFO L82 PathProgramCache]: Analyzing trace with hash -681017545, now seen corresponding path program 21 times [2020-12-23 06:51:06,556 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:51:06,556 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201113142] [2020-12-23 06:51:06,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:51:06,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:51:08,135 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:51:08,135 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1201113142] [2020-12-23 06:51:08,135 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [500236163] [2020-12-23 06:51:08,135 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 06:51:08,722 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2020-12-23 06:51:08,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:51:08,728 WARN L261 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 184 conjunts are in the unsatisfiable core [2020-12-23 06:51:08,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:51:09,241 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:51:09,241 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:51:09,241 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45] total 46 [2020-12-23 06:51:09,242 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632792167] [2020-12-23 06:51:09,242 INFO L461 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-12-23 06:51:09,242 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:51:09,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-12-23 06:51:09,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1959, Unknown=0, NotChecked=0, Total=2070 [2020-12-23 06:51:09,243 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 46 states. [2020-12-23 06:51:12,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:51:12,290 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-12-23 06:51:12,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-12-23 06:51:12,291 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 48 [2020-12-23 06:51:12,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:51:12,292 INFO L225 Difference]: With dead ends: 56 [2020-12-23 06:51:12,292 INFO L226 Difference]: Without dead ends: 52 [2020-12-23 06:51:12,293 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 42 SyntacticMatches, 7 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 868 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=321, Invalid=7335, Unknown=0, NotChecked=0, Total=7656 [2020-12-23 06:51:12,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-12-23 06:51:12,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-12-23 06:51:12,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-12-23 06:51:12,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-12-23 06:51:12,298 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2020-12-23 06:51:12,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:51:12,298 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-12-23 06:51:12,298 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-12-23 06:51:12,298 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-12-23 06:51:12,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-12-23 06:51:12,299 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:51:12,299 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1] [2020-12-23 06:51:12,502 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2020-12-23 06:51:12,503 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:51:12,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:51:12,504 INFO L82 PathProgramCache]: Analyzing trace with hash -1569599399, now seen corresponding path program 22 times [2020-12-23 06:51:12,504 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:51:12,504 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [192489715] [2020-12-23 06:51:12,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:51:12,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:51:14,104 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:51:14,104 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [192489715] [2020-12-23 06:51:14,104 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [215718226] [2020-12-23 06:51:14,104 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 06:51:14,174 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:51:14,174 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:51:14,177 WARN L261 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 179 conjunts are in the unsatisfiable core [2020-12-23 06:51:14,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:51:14,345 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:51:14,346 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:51:14,346 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47] total 48 [2020-12-23 06:51:14,346 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058150625] [2020-12-23 06:51:14,346 INFO L461 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-12-23 06:51:14,347 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:51:14,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-12-23 06:51:14,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=2140, Unknown=0, NotChecked=0, Total=2256 [2020-12-23 06:51:14,348 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 48 states. [2020-12-23 06:51:17,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:51:17,643 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-12-23 06:51:17,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-12-23 06:51:17,644 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 50 [2020-12-23 06:51:17,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:51:17,644 INFO L225 Difference]: With dead ends: 58 [2020-12-23 06:51:17,645 INFO L226 Difference]: Without dead ends: 54 [2020-12-23 06:51:17,646 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 948 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=336, Invalid=8036, Unknown=0, NotChecked=0, Total=8372 [2020-12-23 06:51:17,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-12-23 06:51:17,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-12-23 06:51:17,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-12-23 06:51:17,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-12-23 06:51:17,650 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2020-12-23 06:51:17,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:51:17,651 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-12-23 06:51:17,651 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-12-23 06:51:17,651 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-12-23 06:51:17,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-12-23 06:51:17,651 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:51:17,652 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1] [2020-12-23 06:51:17,852 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:51:17,853 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:51:17,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:51:17,854 INFO L82 PathProgramCache]: Analyzing trace with hash -798269189, now seen corresponding path program 23 times [2020-12-23 06:51:17,854 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:51:17,854 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1462911337] [2020-12-23 06:51:17,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:51:17,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:51:19,688 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:51:19,688 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1462911337] [2020-12-23 06:51:19,688 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [378091434] [2020-12-23 06:51:19,689 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 06:51:21,595 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2020-12-23 06:51:21,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:51:21,602 WARN L261 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 207 conjunts are in the unsatisfiable core [2020-12-23 06:51:21,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:51:22,691 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:51:22,691 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:51:22,691 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 50 [2020-12-23 06:51:22,692 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1825162999] [2020-12-23 06:51:22,692 INFO L461 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-12-23 06:51:22,692 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:51:22,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-12-23 06:51:22,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=2329, Unknown=0, NotChecked=0, Total=2450 [2020-12-23 06:51:22,693 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 50 states. [2020-12-23 06:51:26,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:51:26,286 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-12-23 06:51:26,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-12-23 06:51:26,286 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 52 [2020-12-23 06:51:26,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:51:26,287 INFO L225 Difference]: With dead ends: 60 [2020-12-23 06:51:26,287 INFO L226 Difference]: Without dead ends: 56 [2020-12-23 06:51:26,288 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 32 SyntacticMatches, 21 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1057 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=351, Invalid=8769, Unknown=0, NotChecked=0, Total=9120 [2020-12-23 06:51:26,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-12-23 06:51:26,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-12-23 06:51:26,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-12-23 06:51:26,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-12-23 06:51:26,292 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2020-12-23 06:51:26,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:51:26,292 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-12-23 06:51:26,292 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-12-23 06:51:26,292 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-12-23 06:51:26,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-12-23 06:51:26,293 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:51:26,293 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1] [2020-12-23 06:51:26,496 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2020-12-23 06:51:26,497 INFO L429 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:51:26,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:51:26,498 INFO L82 PathProgramCache]: Analyzing trace with hash 1715687709, now seen corresponding path program 24 times [2020-12-23 06:51:26,498 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:51:26,498 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1644738134] [2020-12-23 06:51:26,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:51:26,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:51:28,614 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:51:28,615 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1644738134] [2020-12-23 06:51:28,615 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [99675307] [2020-12-23 06:51:28,615 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 06:51:29,627 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2020-12-23 06:51:29,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:51:29,632 WARN L261 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 202 conjunts are in the unsatisfiable core [2020-12-23 06:51:29,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:51:29,800 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-23 06:51:29,879 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:51:29,879 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:51:29,879 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 52] total 53 [2020-12-23 06:51:29,879 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981832250] [2020-12-23 06:51:29,880 INFO L461 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-12-23 06:51:29,880 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:51:29,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-12-23 06:51:29,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=2628, Unknown=0, NotChecked=0, Total=2756 [2020-12-23 06:51:29,881 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 53 states. [2020-12-23 06:51:33,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:51:33,787 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-12-23 06:51:33,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-12-23 06:51:33,788 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 54 [2020-12-23 06:51:33,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:51:33,789 INFO L225 Difference]: With dead ends: 62 [2020-12-23 06:51:33,789 INFO L226 Difference]: Without dead ends: 58 [2020-12-23 06:51:33,791 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1132 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=368, Invalid=9732, Unknown=0, NotChecked=0, Total=10100 [2020-12-23 06:51:33,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-12-23 06:51:33,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-12-23 06:51:33,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-12-23 06:51:33,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-12-23 06:51:33,795 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2020-12-23 06:51:33,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:51:33,796 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-12-23 06:51:33,796 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-12-23 06:51:33,796 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-12-23 06:51:33,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-12-23 06:51:33,796 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:51:33,797 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1] [2020-12-23 06:51:34,000 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:51:34,001 INFO L429 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:51:34,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:51:34,002 INFO L82 PathProgramCache]: Analyzing trace with hash -438320961, now seen corresponding path program 25 times [2020-12-23 06:51:34,002 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:51:34,002 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [517786871] [2020-12-23 06:51:34,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:51:34,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:51:36,271 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:51:36,272 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [517786871] [2020-12-23 06:51:36,272 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1318312501] [2020-12-23 06:51:36,272 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 06:51:36,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:51:36,350 WARN L261 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 203 conjunts are in the unsatisfiable core [2020-12-23 06:51:36,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:51:36,526 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:51:36,527 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:51:36,527 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53] total 54 [2020-12-23 06:51:36,527 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830927341] [2020-12-23 06:51:36,527 INFO L461 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-12-23 06:51:36,527 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:51:36,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-12-23 06:51:36,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=2731, Unknown=0, NotChecked=0, Total=2862 [2020-12-23 06:51:36,529 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 54 states. [2020-12-23 06:51:40,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:51:40,785 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-12-23 06:51:40,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-12-23 06:51:40,786 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 56 [2020-12-23 06:51:40,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:51:40,787 INFO L225 Difference]: With dead ends: 64 [2020-12-23 06:51:40,787 INFO L226 Difference]: Without dead ends: 60 [2020-12-23 06:51:40,788 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1227 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=381, Invalid=10331, Unknown=0, NotChecked=0, Total=10712 [2020-12-23 06:51:40,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-12-23 06:51:40,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-12-23 06:51:40,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-12-23 06:51:40,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-12-23 06:51:40,792 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2020-12-23 06:51:40,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:51:40,793 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-12-23 06:51:40,793 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-12-23 06:51:40,793 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-12-23 06:51:40,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-12-23 06:51:40,793 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:51:40,793 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1] [2020-12-23 06:51:40,994 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2020-12-23 06:51:40,994 INFO L429 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:51:40,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:51:40,995 INFO L82 PathProgramCache]: Analyzing trace with hash -266416159, now seen corresponding path program 26 times [2020-12-23 06:51:40,996 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:51:40,996 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59993212] [2020-12-23 06:51:40,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:51:41,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:51:43,409 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:51:43,410 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59993212] [2020-12-23 06:51:43,410 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [16828292] [2020-12-23 06:51:43,410 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 06:51:43,490 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:51:43,490 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:51:43,493 WARN L261 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 211 conjunts are in the unsatisfiable core [2020-12-23 06:51:43,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:51:43,659 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:51:43,659 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:51:43,660 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55] total 56 [2020-12-23 06:51:43,660 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265126791] [2020-12-23 06:51:43,660 INFO L461 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-12-23 06:51:43,660 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:51:43,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-12-23 06:51:43,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=2944, Unknown=0, NotChecked=0, Total=3080 [2020-12-23 06:51:43,661 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 56 states. [2020-12-23 06:51:48,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:51:48,262 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2020-12-23 06:51:48,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-12-23 06:51:48,263 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 58 [2020-12-23 06:51:48,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:51:48,263 INFO L225 Difference]: With dead ends: 66 [2020-12-23 06:51:48,264 INFO L226 Difference]: Without dead ends: 62 [2020-12-23 06:51:48,265 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1328 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=396, Invalid=11160, Unknown=0, NotChecked=0, Total=11556 [2020-12-23 06:51:48,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-12-23 06:51:48,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-12-23 06:51:48,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-12-23 06:51:48,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2020-12-23 06:51:48,268 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2020-12-23 06:51:48,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:51:48,269 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2020-12-23 06:51:48,269 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-12-23 06:51:48,269 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2020-12-23 06:51:48,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-12-23 06:51:48,269 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:51:48,269 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1] [2020-12-23 06:51:48,483 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2020-12-23 06:51:48,484 INFO L429 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:51:48,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:51:48,485 INFO L82 PathProgramCache]: Analyzing trace with hash 1725341315, now seen corresponding path program 27 times [2020-12-23 06:51:48,485 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:51:48,485 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1288455836] [2020-12-23 06:51:48,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:51:48,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:51:51,127 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:51:51,127 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1288455836] [2020-12-23 06:51:51,127 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [584766931] [2020-12-23 06:51:51,127 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 06:51:51,682 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2020-12-23 06:51:51,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:51:51,687 WARN L261 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 226 conjunts are in the unsatisfiable core [2020-12-23 06:51:51,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:51:51,855 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-23 06:51:51,939 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:51:51,940 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:51:51,940 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 58] total 59 [2020-12-23 06:51:51,940 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051111917] [2020-12-23 06:51:51,941 INFO L461 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-12-23 06:51:51,941 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:51:51,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-12-23 06:51:51,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=3279, Unknown=0, NotChecked=0, Total=3422 [2020-12-23 06:51:51,942 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 59 states. [2020-12-23 06:51:56,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:51:56,923 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2020-12-23 06:51:56,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-12-23 06:51:56,924 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 60 [2020-12-23 06:51:56,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:51:56,924 INFO L225 Difference]: With dead ends: 68 [2020-12-23 06:51:56,924 INFO L226 Difference]: Without dead ends: 64 [2020-12-23 06:51:56,925 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1435 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=413, Invalid=12243, Unknown=0, NotChecked=0, Total=12656 [2020-12-23 06:51:56,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-12-23 06:51:56,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-12-23 06:51:56,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-12-23 06:51:56,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2020-12-23 06:51:56,928 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2020-12-23 06:51:56,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:51:56,928 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2020-12-23 06:51:56,929 INFO L482 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-12-23 06:51:56,929 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2020-12-23 06:51:56,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-12-23 06:51:56,930 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:51:56,930 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1] [2020-12-23 06:51:57,134 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2020-12-23 06:51:57,135 INFO L429 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:51:57,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:51:57,136 INFO L82 PathProgramCache]: Analyzing trace with hash 248859813, now seen corresponding path program 28 times [2020-12-23 06:51:57,136 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:51:57,136 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1173246420] [2020-12-23 06:51:57,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:51:57,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:51:59,896 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:51:59,896 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1173246420] [2020-12-23 06:51:59,896 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1118716580] [2020-12-23 06:51:59,897 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 06:51:59,976 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:51:59,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:51:59,981 WARN L261 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 227 conjunts are in the unsatisfiable core [2020-12-23 06:51:59,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:00,187 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:00,187 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:00,187 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59] total 60 [2020-12-23 06:52:00,187 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673434059] [2020-12-23 06:52:00,188 INFO L461 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-12-23 06:52:00,188 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:00,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-12-23 06:52:00,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=3394, Unknown=0, NotChecked=0, Total=3540 [2020-12-23 06:52:00,188 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 60 states. [2020-12-23 06:52:05,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:05,573 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2020-12-23 06:52:05,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-12-23 06:52:05,574 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 62 [2020-12-23 06:52:05,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:05,575 INFO L225 Difference]: With dead ends: 70 [2020-12-23 06:52:05,575 INFO L226 Difference]: Without dead ends: 66 [2020-12-23 06:52:05,576 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1542 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=426, Invalid=12914, Unknown=0, NotChecked=0, Total=13340 [2020-12-23 06:52:05,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-12-23 06:52:05,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-12-23 06:52:05,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-12-23 06:52:05,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2020-12-23 06:52:05,581 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2020-12-23 06:52:05,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:05,582 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2020-12-23 06:52:05,582 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-12-23 06:52:05,582 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2020-12-23 06:52:05,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-12-23 06:52:05,582 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:05,583 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:05,789 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2020-12-23 06:52:05,790 INFO L429 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:05,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:05,791 INFO L82 PathProgramCache]: Analyzing trace with hash -1310655929, now seen corresponding path program 29 times [2020-12-23 06:52:05,791 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:05,791 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [869043237] [2020-12-23 06:52:05,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:05,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:08,871 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:08,871 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [869043237] [2020-12-23 06:52:08,871 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [800884179] [2020-12-23 06:52:08,872 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 06:52:23,880 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2020-12-23 06:52:23,880 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:52:23,896 WARN L261 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 253 conjunts are in the unsatisfiable core [2020-12-23 06:52:23,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:25,379 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:25,381 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:25,381 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61] total 62 [2020-12-23 06:52:25,382 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385437131] [2020-12-23 06:52:25,382 INFO L461 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-12-23 06:52:25,383 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:25,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-12-23 06:52:25,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=3631, Unknown=0, NotChecked=0, Total=3782 [2020-12-23 06:52:25,384 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 62 states. [2020-12-23 06:52:31,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:31,114 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2020-12-23 06:52:31,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2020-12-23 06:52:31,115 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 64 [2020-12-23 06:52:31,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:31,116 INFO L225 Difference]: With dead ends: 72 [2020-12-23 06:52:31,116 INFO L226 Difference]: Without dead ends: 68 [2020-12-23 06:52:31,117 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 46 SyntacticMatches, 19 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1673 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=441, Invalid=13839, Unknown=0, NotChecked=0, Total=14280 [2020-12-23 06:52:31,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-12-23 06:52:31,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-12-23 06:52:31,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-12-23 06:52:31,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2020-12-23 06:52:31,127 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2020-12-23 06:52:31,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:31,128 INFO L481 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2020-12-23 06:52:31,128 INFO L482 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-12-23 06:52:31,128 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2020-12-23 06:52:31,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-12-23 06:52:31,128 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:31,128 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:31,335 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:31,335 INFO L429 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:31,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:31,336 INFO L82 PathProgramCache]: Analyzing trace with hash -1061697687, now seen corresponding path program 30 times [2020-12-23 06:52:31,337 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:31,337 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1976903224] [2020-12-23 06:52:31,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:31,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:34,598 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:34,599 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1976903224] [2020-12-23 06:52:34,599 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [405876872] [2020-12-23 06:52:34,599 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 06:52:38,703 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2020-12-23 06:52:38,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:52:38,711 WARN L261 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 255 conjunts are in the unsatisfiable core [2020-12-23 06:52:38,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:39,378 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:39,378 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:39,378 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63] total 64 [2020-12-23 06:52:39,378 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046452972] [2020-12-23 06:52:39,379 INFO L461 AbstractCegarLoop]: Interpolant automaton has 64 states [2020-12-23 06:52:39,379 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:39,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2020-12-23 06:52:39,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=3876, Unknown=0, NotChecked=0, Total=4032 [2020-12-23 06:52:39,380 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 64 states. [2020-12-23 06:52:45,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:45,557 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2020-12-23 06:52:45,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-12-23 06:52:45,557 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 66 [2020-12-23 06:52:45,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:45,558 INFO L225 Difference]: With dead ends: 74 [2020-12-23 06:52:45,558 INFO L226 Difference]: Without dead ends: 70 [2020-12-23 06:52:45,560 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 61 SyntacticMatches, 6 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1776 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=456, Invalid=14796, Unknown=0, NotChecked=0, Total=15252 [2020-12-23 06:52:45,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-12-23 06:52:45,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-12-23 06:52:45,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-12-23 06:52:45,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2020-12-23 06:52:45,564 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2020-12-23 06:52:45,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:45,565 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2020-12-23 06:52:45,565 INFO L482 AbstractCegarLoop]: Interpolant automaton has 64 states. [2020-12-23 06:52:45,565 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2020-12-23 06:52:45,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-12-23 06:52:45,565 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:45,566 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:45,767 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:45,768 INFO L429 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:45,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:45,769 INFO L82 PathProgramCache]: Analyzing trace with hash 1963971595, now seen corresponding path program 31 times [2020-12-23 06:52:45,769 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:45,769 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [847787009] [2020-12-23 06:52:45,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:45,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:49,218 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:49,219 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [847787009] [2020-12-23 06:52:49,219 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [182010390] [2020-12-23 06:52:49,219 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 06:52:49,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:52:49,306 WARN L261 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 251 conjunts are in the unsatisfiable core [2020-12-23 06:52:49,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:52:49,512 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:52:49,512 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:52:49,512 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65] total 66 [2020-12-23 06:52:49,512 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280557522] [2020-12-23 06:52:49,513 INFO L461 AbstractCegarLoop]: Interpolant automaton has 66 states [2020-12-23 06:52:49,513 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:52:49,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2020-12-23 06:52:49,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=4129, Unknown=0, NotChecked=0, Total=4290 [2020-12-23 06:52:49,514 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 66 states. [2020-12-23 06:52:56,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:52:56,119 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2020-12-23 06:52:56,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2020-12-23 06:52:56,120 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 68 [2020-12-23 06:52:56,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:52:56,121 INFO L225 Difference]: With dead ends: 76 [2020-12-23 06:52:56,121 INFO L226 Difference]: Without dead ends: 72 [2020-12-23 06:52:56,122 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1893 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=471, Invalid=15785, Unknown=0, NotChecked=0, Total=16256 [2020-12-23 06:52:56,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-12-23 06:52:56,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-12-23 06:52:56,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-12-23 06:52:56,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2020-12-23 06:52:56,127 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2020-12-23 06:52:56,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:52:56,127 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2020-12-23 06:52:56,127 INFO L482 AbstractCegarLoop]: Interpolant automaton has 66 states. [2020-12-23 06:52:56,127 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2020-12-23 06:52:56,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-12-23 06:52:56,128 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:52:56,128 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1] [2020-12-23 06:52:56,332 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,32 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:52:56,333 INFO L429 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:52:56,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:52:56,334 INFO L82 PathProgramCache]: Analyzing trace with hash 1939292205, now seen corresponding path program 32 times [2020-12-23 06:52:56,334 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:52:56,334 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1510089206] [2020-12-23 06:52:56,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:52:56,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:53:00,084 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:00,084 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1510089206] [2020-12-23 06:53:00,084 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621631571] [2020-12-23 06:53:00,085 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 06:53:00,173 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:53:00,173 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:53:00,177 WARN L261 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 259 conjunts are in the unsatisfiable core [2020-12-23 06:53:00,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:53:00,397 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:00,398 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:53:00,398 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67] total 68 [2020-12-23 06:53:00,398 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937307480] [2020-12-23 06:53:00,398 INFO L461 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-12-23 06:53:00,398 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:53:00,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-12-23 06:53:00,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=4390, Unknown=0, NotChecked=0, Total=4556 [2020-12-23 06:53:00,399 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 68 states. [2020-12-23 06:53:07,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:53:07,474 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2020-12-23 06:53:07,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2020-12-23 06:53:07,475 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 70 [2020-12-23 06:53:07,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:53:07,475 INFO L225 Difference]: With dead ends: 78 [2020-12-23 06:53:07,476 INFO L226 Difference]: Without dead ends: 74 [2020-12-23 06:53:07,477 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2018 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=486, Invalid=16806, Unknown=0, NotChecked=0, Total=17292 [2020-12-23 06:53:07,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-12-23 06:53:07,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-12-23 06:53:07,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-12-23 06:53:07,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2020-12-23 06:53:07,480 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2020-12-23 06:53:07,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:53:07,481 INFO L481 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2020-12-23 06:53:07,481 INFO L482 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-12-23 06:53:07,481 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2020-12-23 06:53:07,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-12-23 06:53:07,481 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:53:07,482 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1] [2020-12-23 06:53:07,683 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2020-12-23 06:53:07,684 INFO L429 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:53:07,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:53:07,685 INFO L82 PathProgramCache]: Analyzing trace with hash -302765105, now seen corresponding path program 33 times [2020-12-23 06:53:07,685 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:53:07,685 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1626825865] [2020-12-23 06:53:07,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:53:07,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:53:11,698 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:11,699 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1626825865] [2020-12-23 06:53:11,699 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2118972707] [2020-12-23 06:53:11,699 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 06:53:13,014 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2020-12-23 06:53:13,014 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:53:13,020 WARN L261 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 283 conjunts are in the unsatisfiable core [2020-12-23 06:53:13,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:53:14,195 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:14,195 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:53:14,195 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69] total 70 [2020-12-23 06:53:14,196 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938179557] [2020-12-23 06:53:14,196 INFO L461 AbstractCegarLoop]: Interpolant automaton has 70 states [2020-12-23 06:53:14,196 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:53:14,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2020-12-23 06:53:14,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=4659, Unknown=0, NotChecked=0, Total=4830 [2020-12-23 06:53:14,197 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 70 states. [2020-12-23 06:53:21,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:53:21,938 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2020-12-23 06:53:21,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-12-23 06:53:21,939 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 72 [2020-12-23 06:53:21,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:53:21,939 INFO L225 Difference]: With dead ends: 80 [2020-12-23 06:53:21,940 INFO L226 Difference]: Without dead ends: 76 [2020-12-23 06:53:21,941 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 63 SyntacticMatches, 10 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2155 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=501, Invalid=17859, Unknown=0, NotChecked=0, Total=18360 [2020-12-23 06:53:21,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-12-23 06:53:21,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-12-23 06:53:21,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-12-23 06:53:21,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2020-12-23 06:53:21,945 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2020-12-23 06:53:21,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:53:21,946 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2020-12-23 06:53:21,946 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2020-12-23 06:53:21,946 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2020-12-23 06:53:21,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-12-23 06:53:21,946 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:53:21,947 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1] [2020-12-23 06:53:22,153 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,34 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:53:22,154 INFO L429 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:53:22,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:53:22,155 INFO L82 PathProgramCache]: Analyzing trace with hash 1153742577, now seen corresponding path program 34 times [2020-12-23 06:53:22,155 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:53:22,155 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2047587709] [2020-12-23 06:53:22,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:53:22,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:53:26,436 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:26,436 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2047587709] [2020-12-23 06:53:26,436 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1821605179] [2020-12-23 06:53:26,436 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 06:53:26,540 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:53:26,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:53:26,544 WARN L261 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 275 conjunts are in the unsatisfiable core [2020-12-23 06:53:26,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:53:26,765 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:53:26,765 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:53:26,765 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71] total 72 [2020-12-23 06:53:26,765 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391928246] [2020-12-23 06:53:26,765 INFO L461 AbstractCegarLoop]: Interpolant automaton has 72 states [2020-12-23 06:53:26,766 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:53:26,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2020-12-23 06:53:26,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=4936, Unknown=0, NotChecked=0, Total=5112 [2020-12-23 06:53:26,766 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 72 states. [2020-12-23 06:53:34,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:53:34,869 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2020-12-23 06:53:34,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2020-12-23 06:53:34,870 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 74 [2020-12-23 06:53:34,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:53:34,871 INFO L225 Difference]: With dead ends: 82 [2020-12-23 06:53:34,871 INFO L226 Difference]: Without dead ends: 78 [2020-12-23 06:53:34,872 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2280 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=516, Invalid=18944, Unknown=0, NotChecked=0, Total=19460 [2020-12-23 06:53:34,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-12-23 06:53:34,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-12-23 06:53:34,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-12-23 06:53:34,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2020-12-23 06:53:34,877 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2020-12-23 06:53:34,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:53:34,877 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2020-12-23 06:53:34,877 INFO L482 AbstractCegarLoop]: Interpolant automaton has 72 states. [2020-12-23 06:53:34,877 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2020-12-23 06:53:34,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-12-23 06:53:34,878 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:53:34,878 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1] [2020-12-23 06:53:35,078 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2020-12-23 06:53:35,079 INFO L429 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:53:35,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:53:35,080 INFO L82 PathProgramCache]: Analyzing trace with hash 698286483, now seen corresponding path program 35 times [2020-12-23 06:53:35,080 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:53:35,080 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700701131] [2020-12-23 06:53:35,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:53:35,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:53:39,685 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 06:53:39,685 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1700701131] [2020-12-23 06:53:39,685 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1761157476] [2020-12-23 06:53:39,686 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 06:54:08,950 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 36 check-sat command(s) [2020-12-23 06:54:08,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:54:08,963 WARN L261 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 312 conjunts are in the unsatisfiable core [2020-12-23 06:54:08,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:54:11,623 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 06:54:11,624 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:54:11,624 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73] total 74 [2020-12-23 06:54:11,624 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111999933] [2020-12-23 06:54:11,624 INFO L461 AbstractCegarLoop]: Interpolant automaton has 74 states [2020-12-23 06:54:11,624 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:54:11,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2020-12-23 06:54:11,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=5221, Unknown=0, NotChecked=0, Total=5402 [2020-12-23 06:54:11,625 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 74 states. [2020-12-23 06:54:20,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:54:20,314 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2020-12-23 06:54:20,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2020-12-23 06:54:20,315 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 76 [2020-12-23 06:54:20,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:54:20,316 INFO L225 Difference]: With dead ends: 84 [2020-12-23 06:54:20,316 INFO L226 Difference]: Without dead ends: 80 [2020-12-23 06:54:20,317 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 47 SyntacticMatches, 30 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2446 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=531, Invalid=20061, Unknown=0, NotChecked=0, Total=20592 [2020-12-23 06:54:20,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-12-23 06:54:20,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-12-23 06:54:20,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-12-23 06:54:20,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2020-12-23 06:54:20,320 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2020-12-23 06:54:20,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:54:20,320 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2020-12-23 06:54:20,321 INFO L482 AbstractCegarLoop]: Interpolant automaton has 74 states. [2020-12-23 06:54:20,321 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2020-12-23 06:54:20,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-12-23 06:54:20,321 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:54:20,321 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1] [2020-12-23 06:54:20,521 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,36 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:54:20,522 INFO L429 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:54:20,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:54:20,523 INFO L82 PathProgramCache]: Analyzing trace with hash 1091644341, now seen corresponding path program 36 times [2020-12-23 06:54:20,523 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:54:20,523 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1758734029] [2020-12-23 06:54:20,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:54:20,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:54:25,490 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:54:25,491 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1758734029] [2020-12-23 06:54:25,491 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [159999173] [2020-12-23 06:54:25,491 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 06:54:30,592 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 37 check-sat command(s) [2020-12-23 06:54:30,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:54:30,602 WARN L261 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 292 conjunts are in the unsatisfiable core [2020-12-23 06:54:30,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:54:31,030 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:54:31,031 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:54:31,031 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75] total 76 [2020-12-23 06:54:31,031 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573150784] [2020-12-23 06:54:31,031 INFO L461 AbstractCegarLoop]: Interpolant automaton has 76 states [2020-12-23 06:54:31,032 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:54:31,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2020-12-23 06:54:31,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=5514, Unknown=0, NotChecked=0, Total=5700 [2020-12-23 06:54:31,032 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 76 states.