/usr/bin/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 --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.5 --traceabstraction.additional.smt.options log-additional-information=true -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 0.1.25-177f698 [2020-08-22 06:24:26,935 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 06:24:26,938 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 06:24:26,962 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 06:24:26,963 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 06:24:26,964 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 06:24:26,965 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 06:24:26,967 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 06:24:26,969 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 06:24:26,970 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 06:24:26,971 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 06:24:26,972 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 06:24:26,972 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 06:24:26,973 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 06:24:26,974 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 06:24:26,975 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 06:24:26,976 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 06:24:26,977 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 06:24:26,979 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 06:24:26,981 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 06:24:26,983 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 06:24:26,984 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 06:24:26,985 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 06:24:26,986 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 06:24:26,988 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 06:24:26,989 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 06:24:26,989 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 06:24:26,990 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 06:24:26,990 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 06:24:26,991 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-22 06:24:26,992 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-22 06:24:26,992 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-22 06:24:26,993 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-22 06:24:26,994 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-22 06:24:26,995 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-22 06:24:26,995 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-22 06:24:26,996 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-22 06:24:26,996 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-22 06:24:26,996 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 06:24:26,997 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 06:24:26,998 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 06:24:26,999 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-22 06:24:27,021 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 06:24:27,022 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 06:24:27,023 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 06:24:27,023 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 06:24:27,023 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 06:24:27,024 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 06:24:27,024 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 06:24:27,024 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 06:24:27,024 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 06:24:27,024 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 06:24:27,025 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 06:24:27,025 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 06:24:27,025 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 06:24:27,025 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 06:24:27,025 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 06:24:27,025 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 06:24:27,026 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 06:24:27,026 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 06:24:27,026 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 06:24:27,026 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 06:24:27,027 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 06:24:27,027 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 06:24:27,027 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 06:24:27,027 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 06:24:27,027 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 06:24:27,028 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 06:24:27,028 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 06:24:27,028 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 06:24:27,028 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 06:24:27,028 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; [2020-08-22 06:24:27,327 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 06:24:27,339 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 06:24:27,343 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 06:24:27,344 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 06:24:27,345 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 06:24:27,346 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-08-22 06:24:27,415 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/240a745fb/17fa78934f9545748bf79f51ddafe686/FLAG858f1b583 [2020-08-22 06:24:27,827 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 06:24:27,828 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-08-22 06:24:27,835 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/240a745fb/17fa78934f9545748bf79f51ddafe686/FLAG858f1b583 [2020-08-22 06:24:28,184 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/240a745fb/17fa78934f9545748bf79f51ddafe686 [2020-08-22 06:24:28,195 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 06:24:28,197 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 06:24:28,198 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 06:24:28,198 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 06:24:28,203 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 06:24:28,204 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 06:24:28" (1/1) ... [2020-08-22 06:24:28,208 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@69fc9fb9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:28, skipping insertion in model container [2020-08-22 06:24:28,208 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 06:24:28" (1/1) ... [2020-08-22 06:24:28,217 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 06:24:28,237 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 06:24:28,392 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 06:24:28,396 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 06:24:28,409 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 06:24:28,420 INFO L208 MainTranslator]: Completed translation [2020-08-22 06:24:28,421 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:28 WrapperNode [2020-08-22 06:24:28,421 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 06:24:28,422 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 06:24:28,422 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 06:24:28,422 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 06:24:28,433 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:28" (1/1) ... [2020-08-22 06:24:28,433 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:28" (1/1) ... [2020-08-22 06:24:28,437 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:28" (1/1) ... [2020-08-22 06:24:28,438 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:28" (1/1) ... [2020-08-22 06:24:28,524 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:28" (1/1) ... [2020-08-22 06:24:28,531 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:28" (1/1) ... [2020-08-22 06:24:28,532 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:28" (1/1) ... [2020-08-22 06:24:28,533 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 06:24:28,534 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 06:24:28,534 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 06:24:28,534 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 06:24:28,535 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:28" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 06:24:28,603 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 06:24:28,603 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 06:24:28,604 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 06:24:28,604 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 06:24:28,604 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 06:24:28,604 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 06:24:28,604 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 06:24:28,604 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 06:24:28,605 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 06:24:28,790 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 06:24:28,790 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-22 06:24:28,794 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 06:24:28 BoogieIcfgContainer [2020-08-22 06:24:28,795 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 06:24:28,796 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 06:24:28,796 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 06:24:28,799 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 06:24:28,800 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 06:24:28" (1/3) ... [2020-08-22 06:24:28,801 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@374e991f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 06:24:28, skipping insertion in model container [2020-08-22 06:24:28,801 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:28" (2/3) ... [2020-08-22 06:24:28,801 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@374e991f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 06:24:28, skipping insertion in model container [2020-08-22 06:24:28,802 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 06:24:28" (3/3) ... [2020-08-22 06:24:28,803 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c [2020-08-22 06:24:28,815 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 06:24:28,822 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 06:24:28,836 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 06:24:28,861 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 06:24:28,862 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 06:24:28,862 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 06:24:28,862 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 06:24:28,862 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 06:24:28,862 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 06:24:28,862 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 06:24:28,863 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 06:24:28,880 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-22 06:24:28,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-22 06:24:28,887 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:28,888 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:28,888 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:28,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:28,895 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-22 06:24:28,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:28,903 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [193943998] [2020-08-22 06:24:28,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:28,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:29,191 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 5 [2020-08-22 06:24:29,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:29,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:29,209 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:29,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [193943998] [2020-08-22 06:24:29,215 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 06:24:29,218 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 06:24:29,219 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081678198] [2020-08-22 06:24:29,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 06:24:29,236 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:29,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 06:24:29,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 06:24:29,254 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-22 06:24:29,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:29,290 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-22 06:24:29,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 06:24:29,293 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-22 06:24:29,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:29,302 INFO L225 Difference]: With dead ends: 29 [2020-08-22 06:24:29,302 INFO L226 Difference]: Without dead ends: 12 [2020-08-22 06:24:29,306 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 06:24:29,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-22 06:24:29,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-22 06:24:29,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-22 06:24:29,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-22 06:24:29,351 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-22 06:24:29,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:29,351 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-22 06:24:29,352 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 06:24:29,353 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-22 06:24:29,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-22 06:24:29,353 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:29,354 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:29,354 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 06:24:29,354 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:29,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:29,355 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-22 06:24:29,355 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:29,356 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1646261165] [2020-08-22 06:24:29,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:29,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:29,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:29,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:29,487 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:29,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1646261165] [2020-08-22 06:24:29,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:29,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-22 06:24:29,491 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761516728] [2020-08-22 06:24:29,493 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 06:24:29,494 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:29,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 06:24:29,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-22 06:24:29,495 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-22 06:24:29,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:29,522 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-22 06:24:29,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 06:24:29,523 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-22 06:24:29,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:29,524 INFO L225 Difference]: With dead ends: 18 [2020-08-22 06:24:29,524 INFO L226 Difference]: Without dead ends: 13 [2020-08-22 06:24:29,525 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-22 06:24:29,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-22 06:24:29,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-22 06:24:29,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-22 06:24:29,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-22 06:24:29,531 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-22 06:24:29,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:29,531 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-22 06:24:29,531 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 06:24:29,531 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-22 06:24:29,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-22 06:24:29,532 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:29,532 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:29,533 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 06:24:29,533 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:29,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:29,534 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-22 06:24:29,534 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:29,534 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [912452628] [2020-08-22 06:24:29,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:29,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:29,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:29,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:29,629 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:29,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [912452628] [2020-08-22 06:24:29,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:29,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-22 06:24:29,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445725476] [2020-08-22 06:24:29,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 06:24:29,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:29,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 06:24:29,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-22 06:24:29,633 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-22 06:24:29,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:29,655 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-22 06:24:29,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 06:24:29,656 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-22 06:24:29,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:29,657 INFO L225 Difference]: With dead ends: 19 [2020-08-22 06:24:29,657 INFO L226 Difference]: Without dead ends: 14 [2020-08-22 06:24:29,658 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-22 06:24:29,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-22 06:24:29,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-22 06:24:29,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-22 06:24:29,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-22 06:24:29,664 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-22 06:24:29,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:29,664 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-22 06:24:29,664 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 06:24:29,664 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-22 06:24:29,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-22 06:24:29,665 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:29,665 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:29,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 06:24:29,666 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:29,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:29,667 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-22 06:24:29,667 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:29,667 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [642693112] [2020-08-22 06:24:29,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:29,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:29,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:29,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:29,775 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:29,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [642693112] [2020-08-22 06:24:29,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:29,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 06:24:29,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660679255] [2020-08-22 06:24:29,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 06:24:29,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:29,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 06:24:29,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-22 06:24:29,778 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-22 06:24:29,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:29,805 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-22 06:24:29,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 06:24:29,806 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-22 06:24:29,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:29,807 INFO L225 Difference]: With dead ends: 20 [2020-08-22 06:24:29,807 INFO L226 Difference]: Without dead ends: 15 [2020-08-22 06:24:29,807 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-22 06:24:29,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-22 06:24:29,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-22 06:24:29,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-22 06:24:29,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-22 06:24:29,813 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-22 06:24:29,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:29,814 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-22 06:24:29,814 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 06:24:29,814 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-22 06:24:29,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-22 06:24:29,815 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:29,815 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:29,815 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 06:24:29,815 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:29,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:29,816 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-22 06:24:29,816 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:29,816 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2145628067] [2020-08-22 06:24:29,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:29,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:29,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:29,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:29,961 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:29,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2145628067] [2020-08-22 06:24:29,965 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:29,965 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 06:24:29,965 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282998774] [2020-08-22 06:24:29,966 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 06:24:29,966 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:29,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 06:24:29,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-22 06:24:29,967 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-22 06:24:30,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:30,026 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-22 06:24:30,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 06:24:30,027 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-22 06:24:30,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:30,028 INFO L225 Difference]: With dead ends: 21 [2020-08-22 06:24:30,028 INFO L226 Difference]: Without dead ends: 16 [2020-08-22 06:24:30,028 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-22 06:24:30,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-22 06:24:30,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-22 06:24:30,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-22 06:24:30,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-22 06:24:30,035 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-22 06:24:30,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:30,035 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-22 06:24:30,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 06:24:30,036 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-22 06:24:30,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-22 06:24:30,036 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:30,037 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:30,037 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 06:24:30,037 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:30,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:30,038 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-22 06:24:30,038 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:30,039 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1572970861] [2020-08-22 06:24:30,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:30,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:30,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:30,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:30,194 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:30,195 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1572970861] [2020-08-22 06:24:30,195 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:30,195 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 06:24:30,196 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801016042] [2020-08-22 06:24:30,196 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 06:24:30,196 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:30,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 06:24:30,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-22 06:24:30,197 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-22 06:24:30,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:30,246 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-22 06:24:30,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 06:24:30,247 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-22 06:24:30,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:30,248 INFO L225 Difference]: With dead ends: 22 [2020-08-22 06:24:30,248 INFO L226 Difference]: Without dead ends: 17 [2020-08-22 06:24:30,249 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-22 06:24:30,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-22 06:24:30,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-22 06:24:30,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 06:24:30,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-22 06:24:30,255 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-22 06:24:30,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:30,255 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-22 06:24:30,255 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 06:24:30,256 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-22 06:24:30,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 06:24:30,256 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:30,257 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:30,257 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 06:24:30,257 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:30,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:30,258 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-22 06:24:30,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:30,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [845637382] [2020-08-22 06:24:30,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:30,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 06:24:30,277 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-22 06:24:30,278 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 06:24:30,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 06:24:30,299 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 06:24:30 BoogieIcfgContainer [2020-08-22 06:24:30,299 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 06:24:30,301 INFO L168 Benchmark]: Toolchain (without parser) took 2104.69 ms. Allocated memory was 140.0 MB in the beginning and 235.9 MB in the end (delta: 95.9 MB). Free memory was 103.2 MB in the beginning and 192.1 MB in the end (delta: -88.9 MB). Peak memory consumption was 7.0 MB. Max. memory is 7.1 GB. [2020-08-22 06:24:30,302 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-22 06:24:30,303 INFO L168 Benchmark]: CACSL2BoogieTranslator took 223.65 ms. Allocated memory is still 140.0 MB. Free memory was 103.0 MB in the beginning and 93.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-08-22 06:24:30,304 INFO L168 Benchmark]: Boogie Preprocessor took 111.57 ms. Allocated memory was 140.0 MB in the beginning and 202.9 MB in the end (delta: 62.9 MB). Free memory was 93.7 MB in the beginning and 182.0 MB in the end (delta: -88.3 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. [2020-08-22 06:24:30,305 INFO L168 Benchmark]: RCFGBuilder took 261.08 ms. Allocated memory is still 202.9 MB. Free memory was 182.0 MB in the beginning and 170.5 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 7.1 GB. [2020-08-22 06:24:30,306 INFO L168 Benchmark]: TraceAbstraction took 1503.28 ms. Allocated memory was 202.9 MB in the beginning and 235.9 MB in the end (delta: 33.0 MB). Free memory was 169.8 MB in the beginning and 192.1 MB in the end (delta: -22.3 MB). Peak memory consumption was 10.7 MB. Max. memory is 7.1 GB. [2020-08-22 06:24:30,310 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 223.65 ms. Allocated memory is still 140.0 MB. Free memory was 103.0 MB in the beginning and 93.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 111.57 ms. Allocated memory was 140.0 MB in the beginning and 202.9 MB in the end (delta: 62.9 MB). Free memory was 93.7 MB in the beginning and 182.0 MB in the end (delta: -88.3 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 261.08 ms. Allocated memory is still 202.9 MB. Free memory was 182.0 MB in the beginning and 170.5 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1503.28 ms. Allocated memory was 202.9 MB in the beginning and 235.9 MB in the end (delta: 33.0 MB). Free memory was 169.8 MB in the beginning and 192.1 MB in the end (delta: -22.3 MB). Peak memory consumption was 10.7 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; [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND FALSE !(x < 6) [L19] CALL __VERIFIER_assert(y != 64) [L4] COND TRUE !(cond) [L5] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 17 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.4s, OverallIterations: 7, TraceHistogramMax: 6, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 66 SDtfs, 0 SDslu, 166 SDs, 0 SdLazy, 97 SolverSat, 15 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 45 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s 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 DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.7s InterpolantComputationTime, 91 NumberOfCodeBlocks, 91 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 69 ConstructedInterpolants, 0 QuantifiedInterpolants, 2605 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 6 InterpolantComputations, 1 PerfectInterpolantSequences, 0/35 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...