/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/underapprox_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-178dd20 [2021-01-06 16:46:33,285 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-01-06 16:46:33,288 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-01-06 16:46:33,323 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-01-06 16:46:33,336 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-01-06 16:46:33,337 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-01-06 16:46:33,339 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-01-06 16:46:33,340 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-01-06 16:46:33,342 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-01-06 16:46:33,343 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-01-06 16:46:33,345 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-01-06 16:46:33,347 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-01-06 16:46:33,349 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-01-06 16:46:33,351 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-01-06 16:46:33,353 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-01-06 16:46:33,364 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-01-06 16:46:33,367 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-01-06 16:46:33,374 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-01-06 16:46:33,375 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-01-06 16:46:33,379 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-01-06 16:46:33,380 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-01-06 16:46:33,383 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-01-06 16:46:33,384 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-01-06 16:46:33,385 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-01-06 16:46:33,386 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-01-06 16:46:33,386 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-01-06 16:46:33,387 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-01-06 16:46:33,392 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-01-06 16:46:33,395 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2021-01-06 16:46:33,450 INFO L113 SettingsManager]: Loading preferences was successful [2021-01-06 16:46:33,450 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-01-06 16:46:33,452 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-01-06 16:46:33,452 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-01-06 16:46:33,453 INFO L138 SettingsManager]: * Use SBE=true [2021-01-06 16:46:33,453 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-01-06 16:46:33,453 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-01-06 16:46:33,453 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-01-06 16:46:33,454 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-01-06 16:46:33,454 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-01-06 16:46:33,454 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-01-06 16:46:33,454 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-01-06 16:46:33,454 INFO L138 SettingsManager]: * Use constant arrays=true [2021-01-06 16:46:33,455 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-01-06 16:46:33,455 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-01-06 16:46:33,456 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-01-06 16:46:33,456 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-01-06 16:46:33,457 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 16:46:33,457 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-01-06 16:46:33,457 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-01-06 16:46:33,457 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-01-06 16:46:33,457 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-01-06 16:46:33,458 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-01-06 16:46:33,458 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-01-06 16:46:33,458 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-01-06 16:46:33,458 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-01-06 16:46:33,888 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-01-06 16:46:33,925 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-01-06 16:46:33,929 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-01-06 16:46:33,930 INFO L271 PluginConnector]: Initializing CDTParser... [2021-01-06 16:46:33,931 INFO L275 PluginConnector]: CDTParser initialized [2021-01-06 16:46:33,932 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-acceleration/underapprox_2-1.c [2021-01-06 16:46:34,033 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/de10a58a0/3f91c0b952d8416b99a2d9f99a940057/FLAGdd8a3b78a [2021-01-06 16:46:34,702 INFO L306 CDTParser]: Found 1 translation units. [2021-01-06 16:46:34,703 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loop-acceleration/underapprox_2-1.c [2021-01-06 16:46:34,709 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/de10a58a0/3f91c0b952d8416b99a2d9f99a940057/FLAGdd8a3b78a [2021-01-06 16:46:34,731 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/de10a58a0/3f91c0b952d8416b99a2d9f99a940057 [2021-01-06 16:46:34,735 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-01-06 16:46:34,738 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-01-06 16:46:34,741 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-01-06 16:46:34,741 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-01-06 16:46:34,745 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-01-06 16:46:34,746 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 04:46:34" (1/1) ... [2021-01-06 16:46:34,748 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@634c9a3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:46:34, skipping insertion in model container [2021-01-06 16:46:34,748 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 04:46:34" (1/1) ... [2021-01-06 16:46:34,758 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-01-06 16:46:34,771 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-01-06 16:46:34,909 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/underapprox_2-1.c[327,340] [2021-01-06 16:46:34,924 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 16:46:34,933 INFO L203 MainTranslator]: Completed pre-run [2021-01-06 16:46:34,945 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/underapprox_2-1.c[327,340] [2021-01-06 16:46:34,947 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 16:46:34,963 INFO L208 MainTranslator]: Completed translation [2021-01-06 16:46:34,964 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:46:34 WrapperNode [2021-01-06 16:46:34,964 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-01-06 16:46:34,965 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-01-06 16:46:34,966 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-01-06 16:46:34,966 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-01-06 16:46:34,974 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:46:34" (1/1) ... [2021-01-06 16:46:34,981 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:46:34" (1/1) ... [2021-01-06 16:46:35,000 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-01-06 16:46:35,001 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-01-06 16:46:35,001 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-01-06 16:46:35,001 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-01-06 16:46:35,011 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:46:34" (1/1) ... [2021-01-06 16:46:35,011 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:46:34" (1/1) ... [2021-01-06 16:46:35,013 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:46:34" (1/1) ... [2021-01-06 16:46:35,013 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:46:34" (1/1) ... [2021-01-06 16:46:35,016 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:46:34" (1/1) ... [2021-01-06 16:46:35,020 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:46:34" (1/1) ... [2021-01-06 16:46:35,021 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:46:34" (1/1) ... [2021-01-06 16:46:35,023 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-01-06 16:46:35,024 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-01-06 16:46:35,024 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-01-06 16:46:35,024 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-01-06 16:46:35,025 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:46:34" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 16:46:35,120 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-01-06 16:46:35,120 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-01-06 16:46:35,121 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-01-06 16:46:35,121 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-01-06 16:46:35,328 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-01-06 16:46:35,328 INFO L299 CfgBuilder]: Removed 7 assume(true) statements. [2021-01-06 16:46:35,330 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 04:46:35 BoogieIcfgContainer [2021-01-06 16:46:35,330 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-01-06 16:46:35,332 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-01-06 16:46:35,332 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-01-06 16:46:35,336 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-01-06 16:46:35,337 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.01 04:46:34" (1/3) ... [2021-01-06 16:46:35,338 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c503010 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 04:46:35, skipping insertion in model container [2021-01-06 16:46:35,338 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:46:34" (2/3) ... [2021-01-06 16:46:35,338 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c503010 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 04:46:35, skipping insertion in model container [2021-01-06 16:46:35,338 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 04:46:35" (3/3) ... [2021-01-06 16:46:35,340 INFO L111 eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c [2021-01-06 16:46:35,347 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-01-06 16:46:35,353 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-01-06 16:46:35,375 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-01-06 16:46:35,439 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-01-06 16:46:35,440 INFO L378 AbstractCegarLoop]: Hoare is true [2021-01-06 16:46:35,440 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-01-06 16:46:35,440 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-01-06 16:46:35,440 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-01-06 16:46:35,440 INFO L382 AbstractCegarLoop]: Difference is false [2021-01-06 16:46:35,441 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-01-06 16:46:35,441 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-01-06 16:46:35,473 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states. [2021-01-06 16:46:35,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-01-06 16:46:35,488 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:46:35,489 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-01-06 16:46:35,489 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:46:35,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:46:35,504 INFO L82 PathProgramCache]: Analyzing trace with hash 889633835, now seen corresponding path program 1 times [2021-01-06 16:46:35,529 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:46:35,529 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443639514] [2021-01-06 16:46:35,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:46:35,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:46:35,804 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:46:35,805 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443639514] [2021-01-06 16:46:35,806 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 16:46:35,806 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-01-06 16:46:35,807 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58801447] [2021-01-06 16:46:35,811 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-01-06 16:46:35,812 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:46:35,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-01-06 16:46:35,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-01-06 16:46:35,830 INFO L87 Difference]: Start difference. First operand 10 states. Second operand 4 states. [2021-01-06 16:46:35,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:46:35,868 INFO L93 Difference]: Finished difference Result 18 states and 22 transitions. [2021-01-06 16:46:35,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-01-06 16:46:35,870 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2021-01-06 16:46:35,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:46:35,880 INFO L225 Difference]: With dead ends: 18 [2021-01-06 16:46:35,880 INFO L226 Difference]: Without dead ends: 8 [2021-01-06 16:46:35,884 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-01-06 16:46:35,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2021-01-06 16:46:35,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2021-01-06 16:46:35,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2021-01-06 16:46:35,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2021-01-06 16:46:35,920 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2021-01-06 16:46:35,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:46:35,921 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2021-01-06 16:46:35,921 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2021-01-06 16:46:35,921 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2021-01-06 16:46:35,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-01-06 16:46:35,922 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:46:35,922 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-01-06 16:46:35,922 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-01-06 16:46:35,923 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:46:35,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:46:35,924 INFO L82 PathProgramCache]: Analyzing trace with hash 1810510480, now seen corresponding path program 1 times [2021-01-06 16:46:35,924 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:46:35,924 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1990488291] [2021-01-06 16:46:35,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:46:35,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:46:36,086 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:46:36,087 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1990488291] [2021-01-06 16:46:36,088 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1588272013] [2021-01-06 16:46:36,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:46:36,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:46:36,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 11 conjunts are in the unsatisfiable core [2021-01-06 16:46:36,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:46:36,275 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:46:36,275 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:46:36,275 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-01-06 16:46:36,277 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493994262] [2021-01-06 16:46:36,277 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-01-06 16:46:36,278 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:46:36,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-01-06 16:46:36,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-01-06 16:46:36,279 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 6 states. [2021-01-06 16:46:36,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:46:36,299 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2021-01-06 16:46:36,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-01-06 16:46:36,300 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 7 [2021-01-06 16:46:36,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:46:36,301 INFO L225 Difference]: With dead ends: 13 [2021-01-06 16:46:36,301 INFO L226 Difference]: Without dead ends: 9 [2021-01-06 16:46:36,302 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-01-06 16:46:36,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-01-06 16:46:36,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-01-06 16:46:36,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2021-01-06 16:46:36,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2021-01-06 16:46:36,305 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2021-01-06 16:46:36,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:46:36,305 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2021-01-06 16:46:36,305 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-01-06 16:46:36,306 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2021-01-06 16:46:36,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-01-06 16:46:36,306 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:46:36,306 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2021-01-06 16:46:36,517 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-01-06 16:46:36,518 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:46:36,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:46:36,519 INFO L82 PathProgramCache]: Analyzing trace with hash 292915403, now seen corresponding path program 2 times [2021-01-06 16:46:36,520 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:46:36,520 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1348231543] [2021-01-06 16:46:36,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:46:36,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:46:36,627 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:46:36,628 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1348231543] [2021-01-06 16:46:36,628 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [611983465] [2021-01-06 16:46:36,628 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 [2021-01-06 16:46:36,667 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 16:46:36,668 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:46:36,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 13 conjunts are in the unsatisfiable core [2021-01-06 16:46:36,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:46:36,698 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:46:36,698 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:46:36,698 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-01-06 16:46:36,699 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430838484] [2021-01-06 16:46:36,699 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-01-06 16:46:36,699 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:46:36,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-01-06 16:46:36,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-01-06 16:46:36,701 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 7 states. [2021-01-06 16:46:36,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:46:36,731 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2021-01-06 16:46:36,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-01-06 16:46:36,732 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 8 [2021-01-06 16:46:36,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:46:36,732 INFO L225 Difference]: With dead ends: 14 [2021-01-06 16:46:36,732 INFO L226 Difference]: Without dead ends: 10 [2021-01-06 16:46:36,733 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-01-06 16:46:36,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-01-06 16:46:36,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-01-06 16:46:36,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2021-01-06 16:46:36,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2021-01-06 16:46:36,736 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 8 [2021-01-06 16:46:36,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:46:36,737 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2021-01-06 16:46:36,737 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2021-01-06 16:46:36,737 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2021-01-06 16:46:36,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-01-06 16:46:36,738 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:46:36,738 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1] [2021-01-06 16:46:36,952 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:46:36,953 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:46:36,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:46:36,955 INFO L82 PathProgramCache]: Analyzing trace with hash 492108272, now seen corresponding path program 3 times [2021-01-06 16:46:36,955 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:46:36,956 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [879978933] [2021-01-06 16:46:36,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:46:36,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:46:37,051 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:46:37,052 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [879978933] [2021-01-06 16:46:37,052 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [615558201] [2021-01-06 16:46:37,052 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 [2021-01-06 16:46:37,095 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-01-06 16:46:37,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:46:37,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 15 conjunts are in the unsatisfiable core [2021-01-06 16:46:37,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:46:37,133 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:46:37,134 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:46:37,134 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-01-06 16:46:37,134 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420013341] [2021-01-06 16:46:37,135 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-01-06 16:46:37,135 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:46:37,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-01-06 16:46:37,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-01-06 16:46:37,136 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 8 states. [2021-01-06 16:46:37,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:46:37,173 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2021-01-06 16:46:37,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-01-06 16:46:37,173 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 9 [2021-01-06 16:46:37,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:46:37,174 INFO L225 Difference]: With dead ends: 15 [2021-01-06 16:46:37,174 INFO L226 Difference]: Without dead ends: 11 [2021-01-06 16:46:37,174 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-01-06 16:46:37,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2021-01-06 16:46:37,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2021-01-06 16:46:37,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2021-01-06 16:46:37,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2021-01-06 16:46:37,178 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2021-01-06 16:46:37,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:46:37,178 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2021-01-06 16:46:37,178 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-01-06 16:46:37,179 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2021-01-06 16:46:37,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-01-06 16:46:37,179 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:46:37,179 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1] [2021-01-06 16:46:37,393 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:46:37,394 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:46:37,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:46:37,395 INFO L82 PathProgramCache]: Analyzing trace with hash -1922847381, now seen corresponding path program 4 times [2021-01-06 16:46:37,396 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:46:37,396 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411409279] [2021-01-06 16:46:37,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:46:37,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:46:37,512 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:46:37,512 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411409279] [2021-01-06 16:46:37,513 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1322087253] [2021-01-06 16:46:37,513 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 [2021-01-06 16:46:37,554 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 16:46:37,554 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:46:37,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 14 conjunts are in the unsatisfiable core [2021-01-06 16:46:37,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:46:37,596 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:46:37,597 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:46:37,597 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-01-06 16:46:37,597 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910765162] [2021-01-06 16:46:37,598 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-01-06 16:46:37,598 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:46:37,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-01-06 16:46:37,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-01-06 16:46:37,599 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 9 states. [2021-01-06 16:46:37,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:46:37,645 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2021-01-06 16:46:37,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-01-06 16:46:37,646 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 10 [2021-01-06 16:46:37,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:46:37,646 INFO L225 Difference]: With dead ends: 16 [2021-01-06 16:46:37,647 INFO L226 Difference]: Without dead ends: 12 [2021-01-06 16:46:37,647 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-01-06 16:46:37,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-01-06 16:46:37,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-01-06 16:46:37,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2021-01-06 16:46:37,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2021-01-06 16:46:37,651 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2021-01-06 16:46:37,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:46:37,651 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2021-01-06 16:46:37,651 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-01-06 16:46:37,652 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2021-01-06 16:46:37,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-01-06 16:46:37,652 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:46:37,652 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1] [2021-01-06 16:46:37,867 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:46:37,868 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:46:37,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:46:37,869 INFO L82 PathProgramCache]: Analyzing trace with hash 522938704, now seen corresponding path program 5 times [2021-01-06 16:46:37,870 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:46:37,870 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2083710676] [2021-01-06 16:46:37,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:46:37,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:46:38,044 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:46:38,045 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2083710676] [2021-01-06 16:46:38,045 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [143983379] [2021-01-06 16:46:38,045 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 [2021-01-06 16:46:38,089 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-01-06 16:46:38,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:46:38,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 23 conjunts are in the unsatisfiable core [2021-01-06 16:46:38,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:46:38,167 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:46:38,168 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:46:38,168 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-01-06 16:46:38,168 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273602221] [2021-01-06 16:46:38,169 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-01-06 16:46:38,169 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:46:38,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-01-06 16:46:38,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-01-06 16:46:38,170 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 10 states. [2021-01-06 16:46:38,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:46:38,223 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2021-01-06 16:46:38,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-01-06 16:46:38,224 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 11 [2021-01-06 16:46:38,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:46:38,225 INFO L225 Difference]: With dead ends: 17 [2021-01-06 16:46:38,225 INFO L226 Difference]: Without dead ends: 13 [2021-01-06 16:46:38,225 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 6 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-01-06 16:46:38,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-01-06 16:46:38,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-01-06 16:46:38,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2021-01-06 16:46:38,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2021-01-06 16:46:38,229 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2021-01-06 16:46:38,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:46:38,229 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2021-01-06 16:46:38,229 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2021-01-06 16:46:38,229 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2021-01-06 16:46:38,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-01-06 16:46:38,230 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:46:38,230 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1] [2021-01-06 16:46:38,444 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-01-06 16:46:38,445 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:46:38,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:46:38,446 INFO L82 PathProgramCache]: Analyzing trace with hash -967103989, now seen corresponding path program 6 times [2021-01-06 16:46:38,447 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:46:38,447 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [264190630] [2021-01-06 16:46:38,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:46:38,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-01-06 16:46:38,466 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-01-06 16:46:38,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-01-06 16:46:38,481 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-01-06 16:46:38,499 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-01-06 16:46:38,499 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-01-06 16:46:38,500 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-01-06 16:46:38,528 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.01 04:46:38 BoogieIcfgContainer [2021-01-06 16:46:38,528 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-01-06 16:46:38,528 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-01-06 16:46:38,528 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-01-06 16:46:38,529 INFO L275 PluginConnector]: Witness Printer initialized [2021-01-06 16:46:38,529 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 04:46:35" (3/4) ... [2021-01-06 16:46:38,532 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-01-06 16:46:38,590 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/loop-acceleration/underapprox_2-1.c-witness.graphml [2021-01-06 16:46:38,590 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-01-06 16:46:38,592 INFO L168 Benchmark]: Toolchain (without parser) took 3854.35 ms. Allocated memory is still 151.0 MB. Free memory was 125.7 MB in the beginning and 91.7 MB in the end (delta: 34.0 MB). Peak memory consumption was 34.6 MB. Max. memory is 8.0 GB. [2021-01-06 16:46:38,593 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 151.0 MB. Free memory was 124.3 MB in the beginning and 124.2 MB in the end (delta: 96.0 kB). There was no memory consumed. Max. memory is 8.0 GB. [2021-01-06 16:46:38,594 INFO L168 Benchmark]: CACSL2BoogieTranslator took 223.61 ms. Allocated memory is still 151.0 MB. Free memory was 125.5 MB in the beginning and 116.1 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-01-06 16:46:38,594 INFO L168 Benchmark]: Boogie Procedure Inliner took 34.65 ms. Allocated memory is still 151.0 MB. Free memory was 116.1 MB in the beginning and 114.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-01-06 16:46:38,595 INFO L168 Benchmark]: Boogie Preprocessor took 22.39 ms. Allocated memory is still 151.0 MB. Free memory was 114.8 MB in the beginning and 113.8 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-01-06 16:46:38,595 INFO L168 Benchmark]: RCFGBuilder took 306.07 ms. Allocated memory is still 151.0 MB. Free memory was 113.8 MB in the beginning and 102.7 MB in the end (delta: 11.0 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. [2021-01-06 16:46:38,596 INFO L168 Benchmark]: TraceAbstraction took 3196.22 ms. Allocated memory is still 151.0 MB. Free memory was 102.4 MB in the beginning and 93.8 MB in the end (delta: 8.6 MB). Peak memory consumption was 9.5 MB. Max. memory is 8.0 GB. [2021-01-06 16:46:38,597 INFO L168 Benchmark]: Witness Printer took 62.10 ms. Allocated memory is still 151.0 MB. Free memory was 93.8 MB in the beginning and 91.7 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-01-06 16:46:38,600 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 151.0 MB. Free memory was 124.3 MB in the beginning and 124.2 MB in the end (delta: 96.0 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 223.61 ms. Allocated memory is still 151.0 MB. Free memory was 125.5 MB in the beginning and 116.1 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 34.65 ms. Allocated memory is still 151.0 MB. Free memory was 116.1 MB in the beginning and 114.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 22.39 ms. Allocated memory is still 151.0 MB. Free memory was 114.8 MB in the beginning and 113.8 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 306.07 ms. Allocated memory is still 151.0 MB. Free memory was 113.8 MB in the beginning and 102.7 MB in the end (delta: 11.0 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3196.22 ms. Allocated memory is still 151.0 MB. Free memory was 102.4 MB in the beginning and 93.8 MB in the end (delta: 8.6 MB). Peak memory consumption was 9.5 MB. Max. memory is 8.0 GB. * Witness Printer took 62.10 ms. Allocated memory is still 151.0 MB. Free memory was 93.8 MB in the beginning and 91.7 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 7]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L13] unsigned int x = 0; [L14] unsigned int y = 1; [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND FALSE !(x < 6) [L6] COND TRUE !(cond) [L7] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 10 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.0s, OverallIterations: 7, TraceHistogramMax: 6, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 39 SDtfs, 2 SDslu, 93 SDs, 0 SdLazy, 190 SolverSat, 16 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 85 GetRequests, 35 SyntacticMatches, 18 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=13occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 108 NumberOfCodeBlocks, 108 NumberOfCodeBlocksAsserted, 19 NumberOfCheckSat, 85 ConstructedInterpolants, 0 QuantifiedInterpolants, 2686 SizeOfPredicates, 0 NumberOfNonLiveVariables, 290 ConjunctsInSsa, 76 ConjunctsInUnsatCore, 11 InterpolantComputations, 1 PerfectInterpolantSequences, 0/70 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...