/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/array-examples/standard_copy4_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-21 21:24:18,430 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-21 21:24:18,433 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-21 21:24:18,486 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-21 21:24:18,486 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-21 21:24:18,491 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-21 21:24:18,494 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-21 21:24:18,502 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-21 21:24:18,505 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-21 21:24:18,511 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-21 21:24:18,512 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-21 21:24:18,513 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-21 21:24:18,514 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-21 21:24:18,517 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-21 21:24:18,519 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-21 21:24:18,520 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-21 21:24:18,522 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-21 21:24:18,525 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-21 21:24:18,531 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-21 21:24:18,539 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-21 21:24:18,541 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-21 21:24:18,543 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-21 21:24:18,544 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-21 21:24:18,547 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-21 21:24:18,555 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-21 21:24:18,560 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-21 21:24:18,561 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-21 21:24:18,575 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-21 21:24:18,576 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-21 21:24:18,577 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-21 21:24:18,577 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-21 21:24:18,578 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-21 21:24:18,578 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-21 21:24:18,579 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-21 21:24:18,580 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-21 21:24:18,580 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-21 21:24:18,581 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-21 21:24:18,611 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-21 21:24:18,611 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-21 21:24:18,613 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-21 21:24:18,613 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-21 21:24:18,613 INFO L138 SettingsManager]: * Use SBE=true [2020-12-21 21:24:18,613 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-21 21:24:18,614 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-21 21:24:18,614 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-21 21:24:18,614 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-21 21:24:18,614 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-21 21:24:18,614 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-21 21:24:18,614 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-21 21:24:18,615 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-21 21:24:18,615 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-21 21:24:18,615 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-21 21:24:18,615 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-21 21:24:18,615 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-21 21:24:18,616 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-21 21:24:18,616 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-21 21:24:18,616 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-21 21:24:18,616 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-21 21:24:18,616 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-21 21:24:18,617 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-21 21:24:18,617 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-21 21:24:18,617 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-21 21:24:18,617 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/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-21 21:24:19,041 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-21 21:24:19,078 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-21 21:24:19,081 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-21 21:24:19,083 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-21 21:24:19,083 INFO L275 PluginConnector]: CDTParser initialized [2020-12-21 21:24:19,084 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_copy4_ground-2.i [2020-12-21 21:24:19,165 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/55d2b6059/0e65e99880e5494390943a439d4384d4/FLAG4149a6ad1 [2020-12-21 21:24:19,860 INFO L306 CDTParser]: Found 1 translation units. [2020-12-21 21:24:19,861 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_copy4_ground-2.i [2020-12-21 21:24:19,867 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/55d2b6059/0e65e99880e5494390943a439d4384d4/FLAG4149a6ad1 [2020-12-21 21:24:19,881 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/55d2b6059/0e65e99880e5494390943a439d4384d4 [2020-12-21 21:24:19,884 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-21 21:24:19,886 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-21 21:24:19,893 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-21 21:24:19,893 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-21 21:24:19,897 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-21 21:24:19,898 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:24:19" (1/1) ... [2020-12-21 21:24:19,900 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3daecb84 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:19, skipping insertion in model container [2020-12-21 21:24:19,900 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:24:19" (1/1) ... [2020-12-21 21:24:19,909 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-21 21:24:19,928 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-21 21:24:20,074 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_copy4_ground-2.i[816,829] [2020-12-21 21:24:20,106 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:24:20,125 INFO L203 MainTranslator]: Completed pre-run [2020-12-21 21:24:20,144 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_copy4_ground-2.i[816,829] [2020-12-21 21:24:20,168 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:24:20,191 INFO L208 MainTranslator]: Completed translation [2020-12-21 21:24:20,191 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20 WrapperNode [2020-12-21 21:24:20,192 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-21 21:24:20,193 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-21 21:24:20,193 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-21 21:24:20,193 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-21 21:24:20,201 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,210 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,235 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-21 21:24:20,236 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-21 21:24:20,236 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-21 21:24:20,236 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-21 21:24:20,247 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,247 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,250 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,250 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,257 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,262 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,264 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... [2020-12-21 21:24:20,266 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-21 21:24:20,267 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-21 21:24:20,268 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-21 21:24:20,268 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-21 21:24:20,269 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (1/1) ... No working directory specified, using /storage/repos/ultimate/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 [2020-12-21 21:24:20,389 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-21 21:24:20,389 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-21 21:24:20,390 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-21 21:24:20,390 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-21 21:24:20,391 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-21 21:24:20,391 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-21 21:24:20,392 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-21 21:24:20,968 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-21 21:24:20,969 INFO L299 CfgBuilder]: Removed 12 assume(true) statements. [2020-12-21 21:24:20,978 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:24:20 BoogieIcfgContainer [2020-12-21 21:24:20,979 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-21 21:24:20,981 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-21 21:24:20,981 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-21 21:24:20,985 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-21 21:24:20,985 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 09:24:19" (1/3) ... [2020-12-21 21:24:20,986 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@515c43b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:24:20, skipping insertion in model container [2020-12-21 21:24:20,986 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:24:20" (2/3) ... [2020-12-21 21:24:20,987 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@515c43b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:24:20, skipping insertion in model container [2020-12-21 21:24:20,987 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:24:20" (3/3) ... [2020-12-21 21:24:20,989 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_copy4_ground-2.i [2020-12-21 21:24:20,996 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-21 21:24:21,001 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-21 21:24:21,022 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-21 21:24:21,050 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-21 21:24:21,051 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-21 21:24:21,051 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-21 21:24:21,051 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-21 21:24:21,051 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-21 21:24:21,052 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-21 21:24:21,052 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-21 21:24:21,052 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-21 21:24:21,067 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-12-21 21:24:21,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-21 21:24:21,073 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:21,074 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:21,074 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:21,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:21,080 INFO L82 PathProgramCache]: Analyzing trace with hash 1890477095, now seen corresponding path program 1 times [2020-12-21 21:24:21,090 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:21,090 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1383252381] [2020-12-21 21:24:21,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:21,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:21,296 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:24:21,297 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1383252381] [2020-12-21 21:24:21,298 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-21 21:24:21,298 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-21 21:24:21,299 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195935672] [2020-12-21 21:24:21,304 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:24:21,304 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:21,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:24:21,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:24:21,322 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 3 states. [2020-12-21 21:24:21,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:21,361 INFO L93 Difference]: Finished difference Result 52 states and 76 transitions. [2020-12-21 21:24:21,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:24:21,364 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2020-12-21 21:24:21,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:21,374 INFO L225 Difference]: With dead ends: 52 [2020-12-21 21:24:21,374 INFO L226 Difference]: Without dead ends: 25 [2020-12-21 21:24:21,378 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:24:21,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-12-21 21:24:21,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2020-12-21 21:24:21,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-21 21:24:21,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2020-12-21 21:24:21,415 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 15 [2020-12-21 21:24:21,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:21,416 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2020-12-21 21:24:21,416 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:24:21,416 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2020-12-21 21:24:21,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-21 21:24:21,417 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:21,417 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:21,417 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-21 21:24:21,418 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:21,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:21,419 INFO L82 PathProgramCache]: Analyzing trace with hash 1812867813, now seen corresponding path program 1 times [2020-12-21 21:24:21,419 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:21,419 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1152036650] [2020-12-21 21:24:21,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:21,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:21,524 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:24:21,525 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1152036650] [2020-12-21 21:24:21,525 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1093940694] [2020-12-21 21:24:21,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/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 [2020-12-21 21:24:21,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:21,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 2 conjunts are in the unsatisfiable core [2020-12-21 21:24:21,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:21,706 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-21 21:24:21,706 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-12-21 21:24:21,707 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2020-12-21 21:24:21,708 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943822514] [2020-12-21 21:24:21,708 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:24:21,709 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:21,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:24:21,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:21,710 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 3 states. [2020-12-21 21:24:21,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:21,781 INFO L93 Difference]: Finished difference Result 48 states and 60 transitions. [2020-12-21 21:24:21,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:24:21,782 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-12-21 21:24:21,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:21,783 INFO L225 Difference]: With dead ends: 48 [2020-12-21 21:24:21,783 INFO L226 Difference]: Without dead ends: 32 [2020-12-21 21:24:21,784 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:21,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-21 21:24:21,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 28. [2020-12-21 21:24:21,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-21 21:24:21,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2020-12-21 21:24:21,790 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 17 [2020-12-21 21:24:21,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:21,791 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2020-12-21 21:24:21,791 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:24:21,791 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2020-12-21 21:24:21,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-21 21:24:21,792 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:21,792 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:22,005 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-21 21:24:22,006 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:22,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:22,008 INFO L82 PathProgramCache]: Analyzing trace with hash -2029995939, now seen corresponding path program 1 times [2020-12-21 21:24:22,008 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:22,009 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186742730] [2020-12-21 21:24:22,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:22,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:22,096 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-21 21:24:22,096 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186742730] [2020-12-21 21:24:22,097 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [461928824] [2020-12-21 21:24:22,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/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 [2020-12-21 21:24:22,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:22,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-21 21:24:22,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:22,283 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-21 21:24:22,283 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:22,284 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-21 21:24:22,284 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451254097] [2020-12-21 21:24:22,284 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-21 21:24:22,285 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:22,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-21 21:24:22,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:22,286 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand 5 states. [2020-12-21 21:24:22,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:22,316 INFO L93 Difference]: Finished difference Result 54 states and 64 transitions. [2020-12-21 21:24:22,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-21 21:24:22,317 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2020-12-21 21:24:22,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:22,318 INFO L225 Difference]: With dead ends: 54 [2020-12-21 21:24:22,319 INFO L226 Difference]: Without dead ends: 31 [2020-12-21 21:24:22,319 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:22,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-12-21 21:24:22,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2020-12-21 21:24:22,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-12-21 21:24:22,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-12-21 21:24:22,326 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 25 [2020-12-21 21:24:22,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:22,326 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-12-21 21:24:22,326 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-21 21:24:22,326 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-12-21 21:24:22,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-12-21 21:24:22,327 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:22,327 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:22,541 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:22,542 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:22,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:22,543 INFO L82 PathProgramCache]: Analyzing trace with hash 2073930139, now seen corresponding path program 2 times [2020-12-21 21:24:22,544 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:22,544 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1818194535] [2020-12-21 21:24:22,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:22,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:22,629 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-12-21 21:24:22,630 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1818194535] [2020-12-21 21:24:22,630 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1821366969] [2020-12-21 21:24:22,630 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/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 [2020-12-21 21:24:22,791 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:24:22,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:22,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-21 21:24:22,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:22,883 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-12-21 21:24:22,884 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:22,884 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-21 21:24:22,884 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606983541] [2020-12-21 21:24:22,885 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-21 21:24:22,886 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:22,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-21 21:24:22,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:22,888 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 5 states. [2020-12-21 21:24:23,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:23,016 INFO L93 Difference]: Finished difference Result 61 states and 73 transitions. [2020-12-21 21:24:23,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-21 21:24:23,017 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 27 [2020-12-21 21:24:23,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:23,018 INFO L225 Difference]: With dead ends: 61 [2020-12-21 21:24:23,018 INFO L226 Difference]: Without dead ends: 42 [2020-12-21 21:24:23,019 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:24:23,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-12-21 21:24:23,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 38. [2020-12-21 21:24:23,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-12-21 21:24:23,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2020-12-21 21:24:23,041 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 27 [2020-12-21 21:24:23,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:23,041 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2020-12-21 21:24:23,041 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-21 21:24:23,042 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2020-12-21 21:24:23,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-12-21 21:24:23,043 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:23,043 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:23,246 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:23,247 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:23,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:23,249 INFO L82 PathProgramCache]: Analyzing trace with hash -662535917, now seen corresponding path program 3 times [2020-12-21 21:24:23,250 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:23,250 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2023825562] [2020-12-21 21:24:23,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:23,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:23,336 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-21 21:24:23,336 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2023825562] [2020-12-21 21:24:23,337 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [610437616] [2020-12-21 21:24:23,337 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/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 [2020-12-21 21:24:23,503 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-21 21:24:23,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:23,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:24:23,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:23,585 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-21 21:24:23,585 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:23,586 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-21 21:24:23,586 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024706495] [2020-12-21 21:24:23,587 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-21 21:24:23,587 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:23,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-21 21:24:23,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:24:23,588 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand 6 states. [2020-12-21 21:24:23,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:23,620 INFO L93 Difference]: Finished difference Result 72 states and 82 transitions. [2020-12-21 21:24:23,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-21 21:24:23,621 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 35 [2020-12-21 21:24:23,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:23,622 INFO L225 Difference]: With dead ends: 72 [2020-12-21 21:24:23,622 INFO L226 Difference]: Without dead ends: 41 [2020-12-21 21:24:23,622 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:24:23,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-12-21 21:24:23,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2020-12-21 21:24:23,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-12-21 21:24:23,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 45 transitions. [2020-12-21 21:24:23,628 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 45 transitions. Word has length 35 [2020-12-21 21:24:23,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:23,628 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 45 transitions. [2020-12-21 21:24:23,628 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-21 21:24:23,629 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 45 transitions. [2020-12-21 21:24:23,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-12-21 21:24:23,630 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:23,630 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:23,845 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:23,846 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:23,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:23,847 INFO L82 PathProgramCache]: Analyzing trace with hash 365526225, now seen corresponding path program 4 times [2020-12-21 21:24:23,848 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:23,848 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1281851481] [2020-12-21 21:24:23,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:23,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:23,992 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-21 21:24:23,993 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1281851481] [2020-12-21 21:24:23,994 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [638453219] [2020-12-21 21:24:23,994 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/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 [2020-12-21 21:24:24,095 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:24:24,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:24,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-21 21:24:24,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:24,186 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-21 21:24:24,193 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:24,193 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-21 21:24:24,193 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121084512] [2020-12-21 21:24:24,195 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-21 21:24:24,195 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:24,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-21 21:24:24,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:24:24,196 INFO L87 Difference]: Start difference. First operand 40 states and 45 transitions. Second operand 7 states. [2020-12-21 21:24:24,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:24,238 INFO L93 Difference]: Finished difference Result 74 states and 84 transitions. [2020-12-21 21:24:24,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-21 21:24:24,239 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 37 [2020-12-21 21:24:24,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:24,240 INFO L225 Difference]: With dead ends: 74 [2020-12-21 21:24:24,240 INFO L226 Difference]: Without dead ends: 43 [2020-12-21 21:24:24,241 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:24:24,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-12-21 21:24:24,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2020-12-21 21:24:24,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-12-21 21:24:24,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2020-12-21 21:24:24,246 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 37 [2020-12-21 21:24:24,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:24,246 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2020-12-21 21:24:24,246 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-21 21:24:24,247 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2020-12-21 21:24:24,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-21 21:24:24,248 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:24,248 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:24,455 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-21 21:24:24,457 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:24,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:24,459 INFO L82 PathProgramCache]: Analyzing trace with hash 490766607, now seen corresponding path program 5 times [2020-12-21 21:24:24,459 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:24,459 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583839907] [2020-12-21 21:24:24,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:24,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:24,579 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-21 21:24:24,579 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1583839907] [2020-12-21 21:24:24,579 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [925478490] [2020-12-21 21:24:24,580 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/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 [2020-12-21 21:24:25,217 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2020-12-21 21:24:25,217 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:25,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:24:25,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:25,290 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-12-21 21:24:25,291 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:25,292 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 10 [2020-12-21 21:24:25,292 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352146657] [2020-12-21 21:24:25,292 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-21 21:24:25,292 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:25,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-21 21:24:25,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:24:25,294 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 10 states. [2020-12-21 21:24:25,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:25,420 INFO L93 Difference]: Finished difference Result 88 states and 102 transitions. [2020-12-21 21:24:25,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-21 21:24:25,421 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 39 [2020-12-21 21:24:25,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:25,422 INFO L225 Difference]: With dead ends: 88 [2020-12-21 21:24:25,422 INFO L226 Difference]: Without dead ends: 57 [2020-12-21 21:24:25,423 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:24:25,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-12-21 21:24:25,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 52. [2020-12-21 21:24:25,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-12-21 21:24:25,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2020-12-21 21:24:25,429 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 39 [2020-12-21 21:24:25,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:25,429 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2020-12-21 21:24:25,429 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-21 21:24:25,429 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2020-12-21 21:24:25,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-12-21 21:24:25,430 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:25,431 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:25,643 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:25,644 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:25,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:25,645 INFO L82 PathProgramCache]: Analyzing trace with hash 1480545093, now seen corresponding path program 6 times [2020-12-21 21:24:25,646 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:25,646 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1093281030] [2020-12-21 21:24:25,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:25,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:25,759 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-21 21:24:25,760 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1093281030] [2020-12-21 21:24:25,760 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1238139135] [2020-12-21 21:24:25,760 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/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 [2020-12-21 21:24:26,033 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2020-12-21 21:24:26,034 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:26,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-21 21:24:26,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:26,147 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-12-21 21:24:26,148 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:26,148 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 12 [2020-12-21 21:24:26,148 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861736530] [2020-12-21 21:24:26,148 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-21 21:24:26,149 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:26,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-21 21:24:26,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:24:26,151 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 12 states. [2020-12-21 21:24:26,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:26,308 INFO L93 Difference]: Finished difference Result 106 states and 120 transitions. [2020-12-21 21:24:26,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-21 21:24:26,312 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 49 [2020-12-21 21:24:26,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:26,312 INFO L225 Difference]: With dead ends: 106 [2020-12-21 21:24:26,313 INFO L226 Difference]: Without dead ends: 67 [2020-12-21 21:24:26,313 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:24:26,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-12-21 21:24:26,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 62. [2020-12-21 21:24:26,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-12-21 21:24:26,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2020-12-21 21:24:26,319 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 49 [2020-12-21 21:24:26,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:26,320 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2020-12-21 21:24:26,320 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-21 21:24:26,320 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2020-12-21 21:24:26,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-12-21 21:24:26,321 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:26,321 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:26,534 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:26,535 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:26,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:26,537 INFO L82 PathProgramCache]: Analyzing trace with hash -352839173, now seen corresponding path program 7 times [2020-12-21 21:24:26,537 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:26,538 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476329487] [2020-12-21 21:24:26,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:26,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:26,653 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-21 21:24:26,655 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476329487] [2020-12-21 21:24:26,656 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1551041522] [2020-12-21 21:24:26,656 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/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 [2020-12-21 21:24:26,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:26,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-21 21:24:26,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:26,837 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-21 21:24:26,838 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:26,838 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-21 21:24:26,838 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640628167] [2020-12-21 21:24:26,839 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-21 21:24:26,839 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:26,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-21 21:24:26,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:24:26,840 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand 10 states. [2020-12-21 21:24:26,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:26,877 INFO L93 Difference]: Finished difference Result 112 states and 122 transitions. [2020-12-21 21:24:26,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-21 21:24:26,878 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 59 [2020-12-21 21:24:26,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:26,879 INFO L225 Difference]: With dead ends: 112 [2020-12-21 21:24:26,879 INFO L226 Difference]: Without dead ends: 65 [2020-12-21 21:24:26,880 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:24:26,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-12-21 21:24:26,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2020-12-21 21:24:26,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-12-21 21:24:26,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions. [2020-12-21 21:24:26,886 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 59 [2020-12-21 21:24:26,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:26,886 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 69 transitions. [2020-12-21 21:24:26,886 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-21 21:24:26,886 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions. [2020-12-21 21:24:26,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-12-21 21:24:26,887 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:26,887 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:27,100 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-21 21:24:27,101 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:27,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:27,102 INFO L82 PathProgramCache]: Analyzing trace with hash -1382597703, now seen corresponding path program 8 times [2020-12-21 21:24:27,103 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:27,103 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1712066299] [2020-12-21 21:24:27,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:27,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:27,249 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-21 21:24:27,249 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1712066299] [2020-12-21 21:24:27,249 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1379527587] [2020-12-21 21:24:27,250 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/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 [2020-12-21 21:24:27,332 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:24:27,332 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:27,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-21 21:24:27,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:27,447 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-21 21:24:27,448 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:27,448 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-21 21:24:27,448 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838171882] [2020-12-21 21:24:27,448 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-21 21:24:27,449 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:27,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-21 21:24:27,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:24:27,450 INFO L87 Difference]: Start difference. First operand 64 states and 69 transitions. Second operand 11 states. [2020-12-21 21:24:27,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:27,487 INFO L93 Difference]: Finished difference Result 114 states and 124 transitions. [2020-12-21 21:24:27,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-21 21:24:27,488 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 61 [2020-12-21 21:24:27,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:27,489 INFO L225 Difference]: With dead ends: 114 [2020-12-21 21:24:27,489 INFO L226 Difference]: Without dead ends: 67 [2020-12-21 21:24:27,490 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:24:27,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-12-21 21:24:27,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2020-12-21 21:24:27,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-12-21 21:24:27,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 71 transitions. [2020-12-21 21:24:27,496 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 71 transitions. Word has length 61 [2020-12-21 21:24:27,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:27,496 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 71 transitions. [2020-12-21 21:24:27,496 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-21 21:24:27,497 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 71 transitions. [2020-12-21 21:24:27,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-12-21 21:24:27,497 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:27,498 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:27,711 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:27,712 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:27,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:27,713 INFO L82 PathProgramCache]: Analyzing trace with hash 1156900343, now seen corresponding path program 9 times [2020-12-21 21:24:27,713 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:27,713 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610848180] [2020-12-21 21:24:27,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:27,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:27,891 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-21 21:24:27,891 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610848180] [2020-12-21 21:24:27,892 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1817304946] [2020-12-21 21:24:27,892 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/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 [2020-12-21 21:24:28,221 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2020-12-21 21:24:28,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:28,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-21 21:24:28,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:28,375 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2020-12-21 21:24:28,376 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:28,376 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7] total 16 [2020-12-21 21:24:28,376 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70493388] [2020-12-21 21:24:28,377 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-21 21:24:28,377 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:28,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-21 21:24:28,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=165, Unknown=0, NotChecked=0, Total=240 [2020-12-21 21:24:28,378 INFO L87 Difference]: Start difference. First operand 66 states and 71 transitions. Second operand 16 states. [2020-12-21 21:24:28,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:28,556 INFO L93 Difference]: Finished difference Result 128 states and 142 transitions. [2020-12-21 21:24:28,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-21 21:24:28,557 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 63 [2020-12-21 21:24:28,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:28,558 INFO L225 Difference]: With dead ends: 128 [2020-12-21 21:24:28,558 INFO L226 Difference]: Without dead ends: 81 [2020-12-21 21:24:28,560 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=75, Invalid=165, Unknown=0, NotChecked=0, Total=240 [2020-12-21 21:24:28,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-12-21 21:24:28,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 76. [2020-12-21 21:24:28,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-12-21 21:24:28,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 81 transitions. [2020-12-21 21:24:28,582 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 81 transitions. Word has length 63 [2020-12-21 21:24:28,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:28,582 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 81 transitions. [2020-12-21 21:24:28,582 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-21 21:24:28,583 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 81 transitions. [2020-12-21 21:24:28,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-12-21 21:24:28,587 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:28,587 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:28,803 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:24:28,804 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:28,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:28,806 INFO L82 PathProgramCache]: Analyzing trace with hash 2005284397, now seen corresponding path program 10 times [2020-12-21 21:24:28,806 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:28,807 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1219148812] [2020-12-21 21:24:28,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:28,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:28,977 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-12-21 21:24:28,977 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1219148812] [2020-12-21 21:24:28,978 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1534235118] [2020-12-21 21:24:28,978 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/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 [2020-12-21 21:24:29,063 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:24:29,063 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:24:29,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-21 21:24:29,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:24:29,235 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2020-12-21 21:24:29,236 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:24:29,236 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 18 [2020-12-21 21:24:29,236 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501021111] [2020-12-21 21:24:29,237 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-21 21:24:29,237 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:24:29,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-21 21:24:29,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=213, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:24:29,238 INFO L87 Difference]: Start difference. First operand 76 states and 81 transitions. Second operand 18 states. [2020-12-21 21:24:29,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:24:29,448 INFO L93 Difference]: Finished difference Result 146 states and 160 transitions. [2020-12-21 21:24:29,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-21 21:24:29,449 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 73 [2020-12-21 21:24:29,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:24:29,450 INFO L225 Difference]: With dead ends: 146 [2020-12-21 21:24:29,450 INFO L226 Difference]: Without dead ends: 91 [2020-12-21 21:24:29,451 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=213, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:24:29,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-12-21 21:24:29,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 86. [2020-12-21 21:24:29,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-12-21 21:24:29,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 91 transitions. [2020-12-21 21:24:29,456 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 91 transitions. Word has length 73 [2020-12-21 21:24:29,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:24:29,456 INFO L481 AbstractCegarLoop]: Abstraction has 86 states and 91 transitions. [2020-12-21 21:24:29,456 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-21 21:24:29,456 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 91 transitions. [2020-12-21 21:24:29,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-12-21 21:24:29,457 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:24:29,457 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:24:29,670 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-21 21:24:29,671 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:24:29,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:24:29,672 INFO L82 PathProgramCache]: Analyzing trace with hash 1859910371, now seen corresponding path program 11 times [2020-12-21 21:24:29,672 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:24:29,673 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [593228939] [2020-12-21 21:24:29,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:24:29,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:24:29,831 INFO L134 CoverageAnalysis]: Checked inductivity of 244 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-12-21 21:24:29,831 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [593228939] [2020-12-21 21:24:29,831 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2114128112] [2020-12-21 21:24:29,832 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/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