java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c6af20d [2019-09-03 19:41:17,344 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-03 19:41:17,346 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-03 19:41:17,357 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-09-03 19:41:17,357 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-09-03 19:41:17,358 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-09-03 19:41:17,360 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-09-03 19:41:17,361 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-09-03 19:41:17,363 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-09-03 19:41:17,364 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-09-03 19:41:17,365 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-09-03 19:41:17,366 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-09-03 19:41:17,366 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-03 19:41:17,367 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-03 19:41:17,368 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-03 19:41:17,369 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-03 19:41:17,369 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-03 19:41:17,370 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-03 19:41:17,372 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-03 19:41:17,374 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-03 19:41:17,375 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-03 19:41:17,376 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-03 19:41:17,377 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-03 19:41:17,378 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-03 19:41:17,380 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-09-03 19:41:17,380 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-09-03 19:41:17,381 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-09-03 19:41:17,381 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-09-03 19:41:17,382 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-09-03 19:41:17,383 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-09-03 19:41:17,383 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-09-03 19:41:17,383 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-09-03 19:41:17,384 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-09-03 19:41:17,385 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-09-03 19:41:17,386 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-09-03 19:41:17,386 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-09-03 19:41:17,387 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-09-03 19:41:17,387 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-09-03 19:41:17,387 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-03 19:41:17,388 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-03 19:41:17,389 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-03 19:41:17,389 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-09-03 19:41:17,403 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-03 19:41:17,404 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-03 19:41:17,405 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-09-03 19:41:17,405 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-09-03 19:41:17,405 INFO L138 SettingsManager]: * Use SBE=true [2019-09-03 19:41:17,405 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-03 19:41:17,406 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-03 19:41:17,406 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-09-03 19:41:17,406 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-03 19:41:17,406 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-03 19:41:17,406 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-03 19:41:17,406 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-03 19:41:17,407 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-03 19:41:17,407 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-03 19:41:17,407 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-03 19:41:17,407 INFO L138 SettingsManager]: * Use constant arrays=true [2019-09-03 19:41:17,407 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-03 19:41:17,408 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-03 19:41:17,408 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-03 19:41:17,408 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-09-03 19:41:17,408 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-09-03 19:41:17,408 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-03 19:41:17,409 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-03 19:41:17,409 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-03 19:41:17,409 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-09-03 19:41:17,409 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-09-03 19:41:17,409 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-03 19:41:17,410 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-03 19:41:17,410 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-09-03 19:41:17,450 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-03 19:41:17,461 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-03 19:41:17,464 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-03 19:41:17,466 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-03 19:41:17,466 INFO L275 PluginConnector]: CDTParser initialized [2019-09-03 19:41:17,467 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2019-09-03 19:41:17,525 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/56311c352/32d34230644041198744c5add3072bba/FLAG8525c426e [2019-09-03 19:41:17,986 INFO L306 CDTParser]: Found 1 translation units. [2019-09-03 19:41:17,986 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2019-09-03 19:41:17,992 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/56311c352/32d34230644041198744c5add3072bba/FLAG8525c426e [2019-09-03 19:41:18,415 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/56311c352/32d34230644041198744c5add3072bba [2019-09-03 19:41:18,424 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-03 19:41:18,426 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-03 19:41:18,427 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-03 19:41:18,427 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-03 19:41:18,431 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-03 19:41:18,431 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 07:41:18" (1/1) ... [2019-09-03 19:41:18,434 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@52c661a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:41:18, skipping insertion in model container [2019-09-03 19:41:18,434 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 07:41:18" (1/1) ... [2019-09-03 19:41:18,442 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-03 19:41:18,457 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-03 19:41:18,618 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 19:41:18,622 INFO L188 MainTranslator]: Completed pre-run [2019-09-03 19:41:18,638 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 19:41:18,652 INFO L192 MainTranslator]: Completed translation [2019-09-03 19:41:18,653 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:41:18 WrapperNode [2019-09-03 19:41:18,653 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-03 19:41:18,654 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-03 19:41:18,654 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-03 19:41:18,654 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-03 19:41:18,754 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:41:18" (1/1) ... [2019-09-03 19:41:18,755 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:41:18" (1/1) ... [2019-09-03 19:41:18,759 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:41:18" (1/1) ... [2019-09-03 19:41:18,759 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:41:18" (1/1) ... [2019-09-03 19:41:18,762 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:41:18" (1/1) ... [2019-09-03 19:41:18,766 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:41:18" (1/1) ... [2019-09-03 19:41:18,767 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:41:18" (1/1) ... [2019-09-03 19:41:18,768 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-03 19:41:18,768 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-03 19:41:18,768 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-03 19:41:18,768 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-03 19:41:18,769 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:41:18" (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 [2019-09-03 19:41:18,823 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-03 19:41:18,824 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-03 19:41:18,824 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-03 19:41:18,824 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-03 19:41:18,824 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-03 19:41:18,824 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-03 19:41:18,824 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-03 19:41:18,824 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-03 19:41:18,824 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-03 19:41:18,963 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-03 19:41:18,963 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-03 19:41:18,965 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 07:41:18 BoogieIcfgContainer [2019-09-03 19:41:18,965 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-03 19:41:18,966 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-03 19:41:18,966 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-03 19:41:18,969 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-03 19:41:18,969 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.09 07:41:18" (1/3) ... [2019-09-03 19:41:18,970 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b767509 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.09 07:41:18, skipping insertion in model container [2019-09-03 19:41:18,970 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 07:41:18" (2/3) ... [2019-09-03 19:41:18,970 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b767509 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.09 07:41:18, skipping insertion in model container [2019-09-03 19:41:18,971 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 07:41:18" (3/3) ... [2019-09-03 19:41:18,972 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c [2019-09-03 19:41:18,981 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-03 19:41:18,988 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-03 19:41:19,005 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-03 19:41:19,033 INFO L128 ementStrategyFactory]: Using default assertion order modulation [2019-09-03 19:41:19,034 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-03 19:41:19,034 INFO L378 AbstractCegarLoop]: Hoare is true [2019-09-03 19:41:19,034 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-03 19:41:19,035 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-03 19:41:19,035 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-03 19:41:19,035 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-03 19:41:19,035 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-03 19:41:19,035 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-03 19:41:19,052 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2019-09-03 19:41:19,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-03 19:41:19,056 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:41:19,056 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:41:19,059 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:41:19,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:41:19,063 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2019-09-03 19:41:19,064 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:41:19,065 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:41:19,110 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:41:19,110 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:41:19,110 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:41:19,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:41:19,413 WARN L188 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 9 [2019-09-03 19:41:19,439 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:41:19,442 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-03 19:41:19,442 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-09-03 19:41:19,446 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-03 19:41:19,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-03 19:41:19,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-09-03 19:41:19,463 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 5 states. [2019-09-03 19:41:19,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:41:19,575 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2019-09-03 19:41:19,576 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-03 19:41:19,577 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2019-09-03 19:41:19,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:41:19,587 INFO L225 Difference]: With dead ends: 36 [2019-09-03 19:41:19,587 INFO L226 Difference]: Without dead ends: 12 [2019-09-03 19:41:19,593 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-09-03 19:41:19,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-09-03 19:41:19,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-09-03 19:41:19,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-09-03 19:41:19,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2019-09-03 19:41:19,633 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2019-09-03 19:41:19,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:41:19,633 INFO L475 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2019-09-03 19:41:19,634 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-03 19:41:19,634 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2019-09-03 19:41:19,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-09-03 19:41:19,636 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:41:19,637 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:41:19,637 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:41:19,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:41:19,639 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2019-09-03 19:41:19,640 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:41:19,640 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:41:19,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:41:19,643 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:41:19,643 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:41:19,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:41:19,768 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:41:19,769 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:41:19,769 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:41:19,788 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:41:19,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:41:19,804 INFO L256 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 5 conjunts are in the unsatisfiable core [2019-09-03 19:41:19,809 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:41:19,842 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:41:19,847 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:41:19,848 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4] total 8 [2019-09-03 19:41:19,848 INFO L454 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-09-03 19:41:19,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-09-03 19:41:19,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2019-09-03 19:41:19,850 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 8 states. [2019-09-03 19:41:19,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:41:19,924 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2019-09-03 19:41:19,925 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-09-03 19:41:19,925 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 11 [2019-09-03 19:41:19,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:41:19,926 INFO L225 Difference]: With dead ends: 18 [2019-09-03 19:41:19,926 INFO L226 Difference]: Without dead ends: 13 [2019-09-03 19:41:19,927 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2019-09-03 19:41:19,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-09-03 19:41:19,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-09-03 19:41:19,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-09-03 19:41:19,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2019-09-03 19:41:19,932 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2019-09-03 19:41:19,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:41:19,933 INFO L475 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2019-09-03 19:41:19,933 INFO L476 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-09-03 19:41:19,933 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2019-09-03 19:41:19,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-09-03 19:41:19,934 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:41:19,934 INFO L399 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:41:19,934 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:41:19,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:41:19,935 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2019-09-03 19:41:19,935 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:41:19,935 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:41:19,936 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:41:19,936 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 19:41:19,937 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:41:19,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:41:20,056 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:41:20,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:41:20,057 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:41:20,071 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-03 19:41:20,082 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-03 19:41:20,082 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:41:20,083 INFO L256 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 7 conjunts are in the unsatisfiable core [2019-09-03 19:41:20,084 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:41:20,120 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:41:20,124 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:41:20,124 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 10 [2019-09-03 19:41:20,125 INFO L454 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-09-03 19:41:20,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-09-03 19:41:20,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2019-09-03 19:41:20,126 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 10 states. [2019-09-03 19:41:20,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:41:20,212 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2019-09-03 19:41:20,213 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-03 19:41:20,213 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 12 [2019-09-03 19:41:20,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:41:20,214 INFO L225 Difference]: With dead ends: 19 [2019-09-03 19:41:20,214 INFO L226 Difference]: Without dead ends: 14 [2019-09-03 19:41:20,215 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2019-09-03 19:41:20,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-09-03 19:41:20,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-09-03 19:41:20,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-09-03 19:41:20,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2019-09-03 19:41:20,220 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2019-09-03 19:41:20,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:41:20,220 INFO L475 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2019-09-03 19:41:20,220 INFO L476 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-09-03 19:41:20,221 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2019-09-03 19:41:20,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-03 19:41:20,221 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:41:20,221 INFO L399 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:41:20,222 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:41:20,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:41:20,222 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2019-09-03 19:41:20,223 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:41:20,223 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:41:20,224 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:41:20,224 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:41:20,224 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:41:20,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:41:20,337 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:41:20,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:41:20,337 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 19:41:20,356 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:41:20,371 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-09-03 19:41:20,371 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:41:20,372 INFO L256 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 9 conjunts are in the unsatisfiable core [2019-09-03 19:41:20,374 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:41:20,456 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:41:20,461 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:41:20,461 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 12 [2019-09-03 19:41:20,463 INFO L454 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-09-03 19:41:20,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-09-03 19:41:20,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2019-09-03 19:41:20,464 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 12 states. [2019-09-03 19:41:20,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:41:20,590 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2019-09-03 19:41:20,591 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-03 19:41:20,591 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 13 [2019-09-03 19:41:20,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:41:20,592 INFO L225 Difference]: With dead ends: 20 [2019-09-03 19:41:20,592 INFO L226 Difference]: Without dead ends: 15 [2019-09-03 19:41:20,593 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2019-09-03 19:41:20,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-09-03 19:41:20,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-09-03 19:41:20,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-09-03 19:41:20,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2019-09-03 19:41:20,600 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2019-09-03 19:41:20,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:41:20,601 INFO L475 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2019-09-03 19:41:20,601 INFO L476 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-09-03 19:41:20,601 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2019-09-03 19:41:20,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-09-03 19:41:20,602 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:41:20,602 INFO L399 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:41:20,603 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:41:20,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:41:20,603 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2019-09-03 19:41:20,603 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:41:20,604 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:41:20,606 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:41:20,606 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:41:20,606 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:41:20,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:41:20,772 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:41:20,772 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:41:20,772 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:41:20,786 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 19:41:20,799 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 19:41:20,799 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:41:20,800 INFO L256 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 11 conjunts are in the unsatisfiable core [2019-09-03 19:41:20,801 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:41:20,869 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:41:20,875 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:41:20,875 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 14 [2019-09-03 19:41:20,875 INFO L454 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-09-03 19:41:20,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-09-03 19:41:20,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2019-09-03 19:41:20,876 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 14 states. [2019-09-03 19:41:21,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:41:21,018 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2019-09-03 19:41:21,019 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-03 19:41:21,019 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 14 [2019-09-03 19:41:21,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:41:21,020 INFO L225 Difference]: With dead ends: 21 [2019-09-03 19:41:21,020 INFO L226 Difference]: Without dead ends: 16 [2019-09-03 19:41:21,020 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=289, Unknown=0, NotChecked=0, Total=342 [2019-09-03 19:41:21,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-09-03 19:41:21,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-09-03 19:41:21,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-09-03 19:41:21,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2019-09-03 19:41:21,025 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2019-09-03 19:41:21,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:41:21,025 INFO L475 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2019-09-03 19:41:21,025 INFO L476 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-09-03 19:41:21,025 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2019-09-03 19:41:21,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-09-03 19:41:21,026 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:41:21,026 INFO L399 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:41:21,026 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:41:21,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:41:21,027 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2019-09-03 19:41:21,027 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:41:21,027 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:41:21,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:41:21,028 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:41:21,029 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:41:21,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 19:41:21,168 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:41:21,169 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 19:41:21,169 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 19:41:21,191 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-03 19:41:21,206 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2019-09-03 19:41:21,206 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 19:41:21,207 INFO L256 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 13 conjunts are in the unsatisfiable core [2019-09-03 19:41:21,208 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 19:41:21,308 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 19:41:21,311 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 19:41:21,312 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 16 [2019-09-03 19:41:21,312 INFO L454 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-09-03 19:41:21,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-09-03 19:41:21,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=206, Unknown=0, NotChecked=0, Total=240 [2019-09-03 19:41:21,313 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 16 states. [2019-09-03 19:41:21,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 19:41:21,513 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2019-09-03 19:41:21,513 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-09-03 19:41:21,513 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 15 [2019-09-03 19:41:21,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 19:41:21,514 INFO L225 Difference]: With dead ends: 22 [2019-09-03 19:41:21,514 INFO L226 Difference]: Without dead ends: 17 [2019-09-03 19:41:21,515 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=399, Unknown=0, NotChecked=0, Total=462 [2019-09-03 19:41:21,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-09-03 19:41:21,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-09-03 19:41:21,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-09-03 19:41:21,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2019-09-03 19:41:21,520 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2019-09-03 19:41:21,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 19:41:21,520 INFO L475 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2019-09-03 19:41:21,520 INFO L476 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-09-03 19:41:21,520 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2019-09-03 19:41:21,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-09-03 19:41:21,521 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 19:41:21,521 INFO L399 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 19:41:21,522 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 19:41:21,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 19:41:21,522 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2019-09-03 19:41:21,522 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-03 19:41:21,522 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-03 19:41:21,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:41:21,523 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 19:41:21,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 19:41:21,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-09-03 19:41:21,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-09-03 19:41:21,565 INFO L466 BasicCegarLoop]: Counterexample might be feasible [2019-09-03 19:41:21,602 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 03.09 07:41:21 BoogieIcfgContainer [2019-09-03 19:41:21,602 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-09-03 19:41:21,604 INFO L168 Benchmark]: Toolchain (without parser) took 3177.89 ms. Allocated memory was 139.5 MB in the beginning and 263.7 MB in the end (delta: 124.3 MB). Free memory was 87.0 MB in the beginning and 236.4 MB in the end (delta: -149.4 MB). Peak memory consumption was 102.0 MB. Max. memory is 7.1 GB. [2019-09-03 19:41:21,605 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 139.5 MB. Free memory is still 105.1 MB. There was no memory consumed. Max. memory is 7.1 GB. [2019-09-03 19:41:21,605 INFO L168 Benchmark]: CACSL2BoogieTranslator took 226.31 ms. Allocated memory is still 139.5 MB. Free memory was 86.6 MB in the beginning and 77.6 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. [2019-09-03 19:41:21,607 INFO L168 Benchmark]: Boogie Preprocessor took 113.86 ms. Allocated memory was 139.5 MB in the beginning and 199.2 MB in the end (delta: 59.8 MB). Free memory was 77.6 MB in the beginning and 176.2 MB in the end (delta: -98.6 MB). Peak memory consumption was 11.3 MB. Max. memory is 7.1 GB. [2019-09-03 19:41:21,607 INFO L168 Benchmark]: RCFGBuilder took 196.99 ms. Allocated memory is still 199.2 MB. Free memory was 176.2 MB in the beginning and 166.2 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2019-09-03 19:41:21,608 INFO L168 Benchmark]: TraceAbstraction took 2636.54 ms. Allocated memory was 199.2 MB in the beginning and 263.7 MB in the end (delta: 64.5 MB). Free memory was 165.4 MB in the beginning and 236.4 MB in the end (delta: -71.0 MB). Peak memory consumption was 120.5 MB. Max. memory is 7.1 GB. [2019-09-03 19:41:21,612 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 139.5 MB. Free memory is still 105.1 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 226.31 ms. Allocated memory is still 139.5 MB. Free memory was 86.6 MB in the beginning and 77.6 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 113.86 ms. Allocated memory was 139.5 MB in the beginning and 199.2 MB in the end (delta: 59.8 MB). Free memory was 77.6 MB in the beginning and 176.2 MB in the end (delta: -98.6 MB). Peak memory consumption was 11.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 196.99 ms. Allocated memory is still 199.2 MB. Free memory was 176.2 MB in the beginning and 166.2 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2636.54 ms. Allocated memory was 199.2 MB in the beginning and 263.7 MB in the end (delta: 64.5 MB). Free memory was 165.4 MB in the beginning and 236.4 MB in the end (delta: -71.0 MB). Peak memory consumption was 120.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L11] unsigned int x = 0; [L12] unsigned int y = 1; VAL [x=0, y=1] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=1, y=2] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=2, y=4] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=3, y=8] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=4, y=16] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=5, y=32] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=6, y=64] [L14] COND FALSE !(x < 6) VAL [x=6, y=64] [L19] CALL __VERIFIER_assert(y != 64) VAL [\old(cond)=0] [L4] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L5] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 17 locations, 1 error locations. UNSAFE Result, 2.5s OverallTime, 7 OverallIterations, 6 TraceHistogramMax, 0.7s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 64 SDtfs, 7 SDslu, 441 SDs, 0 SdLazy, 278 SolverSat, 16 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 126 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 1.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=17occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.1s InterpolantComputationTime, 156 NumberOfCodeBlocks, 156 NumberOfCodeBlocksAsserted, 19 NumberOfCheckSat, 129 ConstructedInterpolants, 0 QuantifiedInterpolants, 4975 SizeOfPredicates, 5 NumberOfNonLiveVariables, 195 ConjunctsInSsa, 45 ConjunctsInUnsatCore, 11 InterpolantComputations, 1 PerfectInterpolantSequences, 0/70 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...