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/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-673a906-m [2019-10-03 02:31:39,292 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-03 02:31:39,295 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-03 02:31:39,306 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-03 02:31:39,307 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-03 02:31:39,308 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-03 02:31:39,309 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-03 02:31:39,311 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-03 02:31:39,313 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-03 02:31:39,313 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-03 02:31:39,314 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-03 02:31:39,316 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-03 02:31:39,316 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-03 02:31:39,317 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-03 02:31:39,318 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-03 02:31:39,319 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-03 02:31:39,320 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-03 02:31:39,321 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-03 02:31:39,322 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-03 02:31:39,325 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-03 02:31:39,326 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-03 02:31:39,327 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-03 02:31:39,328 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-03 02:31:39,329 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-03 02:31:39,331 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-03 02:31:39,332 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-03 02:31:39,332 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-03 02:31:39,333 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-03 02:31:39,333 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-03 02:31:39,334 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-03 02:31:39,334 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-03 02:31:39,335 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-03 02:31:39,336 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-03 02:31:39,337 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-03 02:31:39,338 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-03 02:31:39,338 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-03 02:31:39,339 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-03 02:31:39,339 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-03 02:31:39,339 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-03 02:31:39,340 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-03 02:31:39,340 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-03 02:31:39,341 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf [2019-10-03 02:31:39,366 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-03 02:31:39,366 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-03 02:31:39,366 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-10-03 02:31:39,367 INFO L138 SettingsManager]: * Log level for plugins=info [2019-10-03 02:31:39,369 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-10-03 02:31:39,369 INFO L138 SettingsManager]: * User list type=DISABLED [2019-10-03 02:31:39,369 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-10-03 02:31:39,369 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-10-03 02:31:39,370 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-10-03 02:31:39,370 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-10-03 02:31:39,371 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-03 02:31:39,371 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-03 02:31:39,371 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-03 02:31:39,371 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-03 02:31:39,371 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-03 02:31:39,372 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-03 02:31:39,372 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-03 02:31:39,372 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-03 02:31:39,373 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-03 02:31:39,374 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-03 02:31:39,374 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-03 02:31:39,374 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-10-03 02:31:39,374 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-03 02:31:39,375 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-03 02:31:39,375 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-03 02:31:39,375 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-03 02:31:39,376 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-10-03 02:31:39,376 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-03 02:31:39,376 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-03 02:31:39,376 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-10-03 02:31:39,405 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-03 02:31:39,416 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-03 02:31:39,420 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-03 02:31:39,421 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-03 02:31:39,423 INFO L275 PluginConnector]: CDTParser initialized [2019-10-03 02:31:39,424 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2019-10-03 02:31:39,486 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c3cae4cea/0bb182c22c004849bba68796f17d0188/FLAG7bc302e41 [2019-10-03 02:31:39,911 INFO L306 CDTParser]: Found 1 translation units. [2019-10-03 02:31:39,912 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2019-10-03 02:31:39,918 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c3cae4cea/0bb182c22c004849bba68796f17d0188/FLAG7bc302e41 [2019-10-03 02:31:40,265 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c3cae4cea/0bb182c22c004849bba68796f17d0188 [2019-10-03 02:31:40,278 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-03 02:31:40,279 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-03 02:31:40,281 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-03 02:31:40,281 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-03 02:31:40,285 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-03 02:31:40,286 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.10 02:31:40" (1/1) ... [2019-10-03 02:31:40,289 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2ce2b1cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:31:40, skipping insertion in model container [2019-10-03 02:31:40,289 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.10 02:31:40" (1/1) ... [2019-10-03 02:31:40,297 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-03 02:31:40,313 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-03 02:31:40,507 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-03 02:31:40,511 INFO L188 MainTranslator]: Completed pre-run [2019-10-03 02:31:40,525 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-03 02:31:40,539 INFO L192 MainTranslator]: Completed translation [2019-10-03 02:31:40,539 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:31:40 WrapperNode [2019-10-03 02:31:40,539 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-03 02:31:40,540 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-03 02:31:40,540 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-03 02:31:40,541 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-03 02:31:40,638 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:31:40" (1/1) ... [2019-10-03 02:31:40,638 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:31:40" (1/1) ... [2019-10-03 02:31:40,644 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:31:40" (1/1) ... [2019-10-03 02:31:40,644 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:31:40" (1/1) ... [2019-10-03 02:31:40,648 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:31:40" (1/1) ... [2019-10-03 02:31:40,652 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:31:40" (1/1) ... [2019-10-03 02:31:40,652 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:31:40" (1/1) ... [2019-10-03 02:31:40,653 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-03 02:31:40,654 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-03 02:31:40,654 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-03 02:31:40,654 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-03 02:31:40,656 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:31:40" (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 [2019-10-03 02:31:40,708 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-03 02:31:40,709 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-03 02:31:40,709 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-03 02:31:40,709 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-03 02:31:40,709 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-03 02:31:40,709 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-03 02:31:40,710 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-03 02:31:40,710 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-03 02:31:40,710 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-03 02:31:40,876 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-03 02:31:40,876 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-03 02:31:40,877 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.10 02:31:40 BoogieIcfgContainer [2019-10-03 02:31:40,878 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-03 02:31:40,879 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-03 02:31:40,879 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-03 02:31:40,882 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-03 02:31:40,882 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.10 02:31:40" (1/3) ... [2019-10-03 02:31:40,883 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@127c3fce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.10 02:31:40, skipping insertion in model container [2019-10-03 02:31:40,883 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.10 02:31:40" (2/3) ... [2019-10-03 02:31:40,884 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@127c3fce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.10 02:31:40, skipping insertion in model container [2019-10-03 02:31:40,884 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.10 02:31:40" (3/3) ... [2019-10-03 02:31:40,886 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c [2019-10-03 02:31:40,893 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-03 02:31:40,899 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-03 02:31:40,915 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-03 02:31:40,939 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-10-03 02:31:40,939 INFO L378 AbstractCegarLoop]: Hoare is false [2019-10-03 02:31:40,939 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-03 02:31:40,939 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-03 02:31:40,939 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-03 02:31:40,940 INFO L382 AbstractCegarLoop]: Difference is false [2019-10-03 02:31:40,940 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-03 02:31:40,940 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-03 02:31:40,951 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2019-10-03 02:31:40,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-10-03 02:31:40,958 INFO L403 BasicCegarLoop]: Found error trace [2019-10-03 02:31:40,958 INFO L411 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-03 02:31:40,960 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-03 02:31:40,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-03 02:31:40,965 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2019-10-03 02:31:40,967 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-10-03 02:31:41,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:31:41,013 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-03 02:31:41,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:31:41,013 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-10-03 02:31:41,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-03 02:31:41,234 WARN L191 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 5 [2019-10-03 02:31:41,258 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:31:41,260 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-03 02:31:41,260 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-03 02:31:41,261 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-10-03 02:31:41,266 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-03 02:31:41,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-03 02:31:41,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-03 02:31:41,285 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 5 states. [2019-10-03 02:31:41,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-03 02:31:41,325 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2019-10-03 02:31:41,326 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-03 02:31:41,327 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2019-10-03 02:31:41,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-03 02:31:41,336 INFO L225 Difference]: With dead ends: 18 [2019-10-03 02:31:41,337 INFO L226 Difference]: Without dead ends: 12 [2019-10-03 02:31:41,339 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-03 02:31:41,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-10-03 02:31:41,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-10-03 02:31:41,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-10-03 02:31:41,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2019-10-03 02:31:41,373 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2019-10-03 02:31:41,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-03 02:31:41,374 INFO L475 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2019-10-03 02:31:41,374 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-03 02:31:41,374 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2019-10-03 02:31:41,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-10-03 02:31:41,375 INFO L403 BasicCegarLoop]: Found error trace [2019-10-03 02:31:41,375 INFO L411 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-03 02:31:41,376 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-03 02:31:41,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-03 02:31:41,376 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2019-10-03 02:31:41,376 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-10-03 02:31:41,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:31:41,378 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-03 02:31:41,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:31:41,378 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-10-03 02:31:41,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-03 02:31:41,528 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:31:41,528 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-03 02:31:41,529 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-10-03 02:31:41,530 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 12 with the following transitions: [2019-10-03 02:31:41,532 INFO L207 CegarAbsIntRunner]: [0], [4], [11], [13], [19], [22], [24], [30], [31], [32], [34] [2019-10-03 02:31:41,566 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-03 02:31:41,566 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-03 02:31:41,620 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2019-10-03 02:31:41,686 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-10-03 02:31:41,689 INFO L272 AbstractInterpreter]: Visited 11 different actions 41 times. Merged at 2 different actions 10 times. Widened at 1 different actions 3 times. Performed 74 root evaluator evaluations with a maximum evaluation depth of 6. Performed 74 inverse root evaluator evaluations with a maximum inverse evaluation depth of 6. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2019-10-03 02:31:41,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-03 02:31:41,693 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-03 02:31:41,693 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-03 02:31:41,693 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2019-10-03 02:31:41,706 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-03 02:31:41,707 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-10-03 02:31:41,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-03 02:31:41,725 INFO L256 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-03 02:31:41,732 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-03 02:31:41,776 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:31:41,777 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-10-03 02:31:41,834 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:31:41,840 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-03 02:31:41,840 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4, 6] total 9 [2019-10-03 02:31:41,841 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-10-03 02:31:41,841 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-03 02:31:41,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-03 02:31:41,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2019-10-03 02:31:41,842 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 7 states. [2019-10-03 02:31:41,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-03 02:31:41,886 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2019-10-03 02:31:41,887 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-03 02:31:41,887 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 11 [2019-10-03 02:31:41,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-03 02:31:41,888 INFO L225 Difference]: With dead ends: 13 [2019-10-03 02:31:41,889 INFO L226 Difference]: Without dead ends: 13 [2019-10-03 02:31:41,890 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 4 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2019-10-03 02:31:41,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-10-03 02:31:41,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-10-03 02:31:41,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-10-03 02:31:41,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2019-10-03 02:31:41,895 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2019-10-03 02:31:41,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-03 02:31:41,896 INFO L475 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2019-10-03 02:31:41,897 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-03 02:31:41,897 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2019-10-03 02:31:41,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-10-03 02:31:41,898 INFO L403 BasicCegarLoop]: Found error trace [2019-10-03 02:31:41,898 INFO L411 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-03 02:31:41,898 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-03 02:31:41,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-03 02:31:41,899 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2019-10-03 02:31:41,903 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-10-03 02:31:41,906 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:31:41,906 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-03 02:31:41,906 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:31:41,907 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-10-03 02:31:41,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-03 02:31:42,057 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:31:42,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-03 02:31:42,058 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-10-03 02:31:42,058 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-10-03 02:31:42,058 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-10-03 02:31:42,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-03 02:31:42,059 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2019-10-03 02:31:42,076 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-10-03 02:31:42,076 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-10-03 02:31:42,098 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-03 02:31:42,098 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-03 02:31:42,099 INFO L256 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-03 02:31:42,101 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-03 02:31:42,145 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:31:42,145 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-10-03 02:31:42,222 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:31:42,226 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-03 02:31:42,226 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 7] total 11 [2019-10-03 02:31:42,226 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-10-03 02:31:42,227 INFO L454 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-03 02:31:42,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-03 02:31:42,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2019-10-03 02:31:42,228 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 8 states. [2019-10-03 02:31:42,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-03 02:31:42,279 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2019-10-03 02:31:42,280 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-03 02:31:42,280 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 12 [2019-10-03 02:31:42,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-03 02:31:42,281 INFO L225 Difference]: With dead ends: 14 [2019-10-03 02:31:42,281 INFO L226 Difference]: Without dead ends: 14 [2019-10-03 02:31:42,283 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 18 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2019-10-03 02:31:42,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-10-03 02:31:42,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-10-03 02:31:42,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-10-03 02:31:42,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2019-10-03 02:31:42,290 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2019-10-03 02:31:42,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-03 02:31:42,290 INFO L475 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2019-10-03 02:31:42,290 INFO L476 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-03 02:31:42,290 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2019-10-03 02:31:42,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-03 02:31:42,294 INFO L403 BasicCegarLoop]: Found error trace [2019-10-03 02:31:42,294 INFO L411 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-03 02:31:42,295 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-03 02:31:42,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-03 02:31:42,295 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2019-10-03 02:31:42,295 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-10-03 02:31:42,297 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:31:42,297 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-03 02:31:42,297 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:31:42,297 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-10-03 02:31:42,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-03 02:31:42,467 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:31:42,468 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-03 02:31:42,468 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-10-03 02:31:42,468 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-10-03 02:31:42,469 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-10-03 02:31:42,469 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-03 02:31:42,469 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-10-03 02:31:42,487 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-10-03 02:31:42,487 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-10-03 02:31:42,501 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-03 02:31:42,501 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-03 02:31:42,502 INFO L256 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-03 02:31:42,503 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-03 02:31:42,545 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:31:42,546 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-10-03 02:31:42,645 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:31:42,649 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-03 02:31:42,649 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 8] total 13 [2019-10-03 02:31:42,649 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-10-03 02:31:42,650 INFO L454 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-03 02:31:42,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-03 02:31:42,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2019-10-03 02:31:42,651 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 9 states. [2019-10-03 02:31:42,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-03 02:31:42,703 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2019-10-03 02:31:42,703 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-03 02:31:42,703 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 13 [2019-10-03 02:31:42,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-03 02:31:42,704 INFO L225 Difference]: With dead ends: 15 [2019-10-03 02:31:42,704 INFO L226 Difference]: Without dead ends: 15 [2019-10-03 02:31:42,705 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 19 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2019-10-03 02:31:42,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-10-03 02:31:42,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-10-03 02:31:42,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-10-03 02:31:42,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2019-10-03 02:31:42,708 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2019-10-03 02:31:42,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-03 02:31:42,708 INFO L475 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2019-10-03 02:31:42,708 INFO L476 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-03 02:31:42,709 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2019-10-03 02:31:42,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-03 02:31:42,709 INFO L403 BasicCegarLoop]: Found error trace [2019-10-03 02:31:42,709 INFO L411 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-03 02:31:42,710 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-03 02:31:42,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-03 02:31:42,710 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2019-10-03 02:31:42,710 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-10-03 02:31:42,712 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:31:42,712 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-03 02:31:42,712 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:31:42,712 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-10-03 02:31:42,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-03 02:31:42,822 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:31:42,823 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-03 02:31:42,823 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-10-03 02:31:42,823 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-10-03 02:31:42,823 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-10-03 02:31:42,823 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-03 02:31:42,824 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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 [2019-10-03 02:31:42,841 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-03 02:31:42,842 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-10-03 02:31:42,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-03 02:31:42,852 INFO L256 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 17 conjunts are in the unsatisfiable core [2019-10-03 02:31:42,854 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-03 02:31:42,887 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:31:42,888 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-10-03 02:31:43,014 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:31:43,018 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-03 02:31:43,018 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 9] total 15 [2019-10-03 02:31:43,018 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-10-03 02:31:43,019 INFO L454 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-03 02:31:43,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-03 02:31:43,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2019-10-03 02:31:43,020 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 10 states. [2019-10-03 02:31:43,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-03 02:31:43,068 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2019-10-03 02:31:43,068 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-03 02:31:43,068 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 14 [2019-10-03 02:31:43,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-03 02:31:43,069 INFO L225 Difference]: With dead ends: 16 [2019-10-03 02:31:43,069 INFO L226 Difference]: Without dead ends: 16 [2019-10-03 02:31:43,070 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 20 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2019-10-03 02:31:43,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-10-03 02:31:43,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-10-03 02:31:43,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-10-03 02:31:43,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2019-10-03 02:31:43,073 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2019-10-03 02:31:43,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-03 02:31:43,073 INFO L475 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2019-10-03 02:31:43,073 INFO L476 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-03 02:31:43,073 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2019-10-03 02:31:43,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-03 02:31:43,074 INFO L403 BasicCegarLoop]: Found error trace [2019-10-03 02:31:43,074 INFO L411 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-03 02:31:43,074 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-03 02:31:43,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-03 02:31:43,075 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2019-10-03 02:31:43,075 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-10-03 02:31:43,076 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:31:43,076 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-03 02:31:43,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:31:43,077 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-10-03 02:31:43,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-03 02:31:43,229 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:31:43,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-03 02:31:43,230 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-10-03 02:31:43,230 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-10-03 02:31:43,231 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-10-03 02:31:43,231 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-10-03 02:31:43,231 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG 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) [2019-10-03 02:31:43,260 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-10-03 02:31:43,260 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-10-03 02:31:43,279 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-10-03 02:31:43,279 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-03 02:31:43,280 INFO L256 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-03 02:31:43,281 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-03 02:31:43,314 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:31:43,315 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-10-03 02:31:43,460 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-03 02:31:43,465 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-10-03 02:31:43,465 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 10] total 17 [2019-10-03 02:31:43,465 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-10-03 02:31:43,466 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-03 02:31:43,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-03 02:31:43,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=203, Unknown=0, NotChecked=0, Total=272 [2019-10-03 02:31:43,468 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 11 states. [2019-10-03 02:31:43,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-03 02:31:43,530 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2019-10-03 02:31:43,530 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-03 02:31:43,530 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 15 [2019-10-03 02:31:43,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-03 02:31:43,531 INFO L225 Difference]: With dead ends: 17 [2019-10-03 02:31:43,531 INFO L226 Difference]: Without dead ends: 17 [2019-10-03 02:31:43,532 INFO L640 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 21 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=69, Invalid=203, Unknown=0, NotChecked=0, Total=272 [2019-10-03 02:31:43,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-10-03 02:31:43,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-10-03 02:31:43,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-10-03 02:31:43,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2019-10-03 02:31:43,535 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2019-10-03 02:31:43,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-03 02:31:43,536 INFO L475 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2019-10-03 02:31:43,536 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-03 02:31:43,536 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2019-10-03 02:31:43,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-03 02:31:43,537 INFO L403 BasicCegarLoop]: Found error trace [2019-10-03 02:31:43,537 INFO L411 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-03 02:31:43,537 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-03 02:31:43,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-03 02:31:43,538 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2019-10-03 02:31:43,538 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-10-03 02:31:43,539 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:31:43,540 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-10-03 02:31:43,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-03 02:31:43,540 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-10-03 02:31:43,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-03 02:31:43,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-03 02:31:43,613 INFO L478 BasicCegarLoop]: Counterexample might be feasible [2019-10-03 02:31:43,644 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 03.10 02:31:43 BoogieIcfgContainer [2019-10-03 02:31:43,645 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-10-03 02:31:43,653 INFO L168 Benchmark]: Toolchain (without parser) took 3374.02 ms. Allocated memory was 140.0 MB in the beginning and 260.0 MB in the end (delta: 120.1 MB). Free memory was 85.9 MB in the beginning and 231.2 MB in the end (delta: -145.3 MB). Peak memory consumption was 101.8 MB. Max. memory is 7.1 GB. [2019-10-03 02:31:43,657 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 140.0 MB. Free memory was 104.7 MB in the beginning and 104.5 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-10-03 02:31:43,659 INFO L168 Benchmark]: CACSL2BoogieTranslator took 259.27 ms. Allocated memory is still 140.0 MB. Free memory was 85.7 MB in the beginning and 76.6 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. [2019-10-03 02:31:43,662 INFO L168 Benchmark]: Boogie Preprocessor took 113.38 ms. Allocated memory was 140.0 MB in the beginning and 199.2 MB in the end (delta: 59.2 MB). Free memory was 76.6 MB in the beginning and 177.2 MB in the end (delta: -100.6 MB). Peak memory consumption was 11.5 MB. Max. memory is 7.1 GB. [2019-10-03 02:31:43,664 INFO L168 Benchmark]: RCFGBuilder took 223.93 ms. Allocated memory is still 199.2 MB. Free memory was 177.2 MB in the beginning and 166.5 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 7.1 GB. [2019-10-03 02:31:43,670 INFO L168 Benchmark]: TraceAbstraction took 2771.42 ms. Allocated memory was 199.2 MB in the beginning and 260.0 MB in the end (delta: 60.8 MB). Free memory was 165.9 MB in the beginning and 231.2 MB in the end (delta: -65.3 MB). Peak memory consumption was 122.6 MB. Max. memory is 7.1 GB. [2019-10-03 02:31:43,677 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 140.0 MB. Free memory was 104.7 MB in the beginning and 104.5 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 259.27 ms. Allocated memory is still 140.0 MB. Free memory was 85.7 MB in the beginning and 76.6 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 113.38 ms. Allocated memory was 140.0 MB in the beginning and 199.2 MB in the end (delta: 59.2 MB). Free memory was 76.6 MB in the beginning and 177.2 MB in the end (delta: -100.6 MB). Peak memory consumption was 11.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 223.93 ms. Allocated memory is still 199.2 MB. Free memory was 177.2 MB in the beginning and 166.5 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2771.42 ms. Allocated memory was 199.2 MB in the beginning and 260.0 MB in the end (delta: 60.8 MB). Free memory was 165.9 MB in the beginning and 231.2 MB in the end (delta: -65.3 MB). Peak memory consumption was 122.6 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(x != 6) 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, 2.7s OverallTime, 7 OverallIterations, 6 TraceHistogramMax, 0.3s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 66 SDtfs, 1 SDslu, 248 SDs, 0 SdLazy, 191 SolverSat, 16 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 176 GetRequests, 97 SyntacticMatches, 21 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 1.1s 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, 0.1s AbstIntTime, 1 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, 1.5s InterpolantComputationTime, 156 NumberOfCodeBlocks, 156 NumberOfCodeBlocksAsserted, 17 NumberOfCheckSat, 189 ConstructedInterpolants, 0 QuantifiedInterpolants, 8269 SizeOfPredicates, 0 NumberOfNonLiveVariables, 195 ConjunctsInSsa, 75 ConjunctsInUnsatCore, 16 InterpolantComputations, 1 PerfectInterpolantSequences, 0/105 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...