/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=HIGHLEXORDER --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 [2020-08-21 19:04:38,033 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 19:04:38,036 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 19:04:38,061 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 19:04:38,061 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 19:04:38,062 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 19:04:38,064 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 19:04:38,065 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 19:04:38,067 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 19:04:38,068 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 19:04:38,069 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 19:04:38,070 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 19:04:38,070 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 19:04:38,071 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 19:04:38,072 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 19:04:38,073 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 19:04:38,074 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 19:04:38,075 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 19:04:38,077 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 19:04:38,078 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 19:04:38,080 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 19:04:38,081 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 19:04:38,082 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 19:04:38,083 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 19:04:38,086 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 19:04:38,093 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 19:04:38,094 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 19:04:38,095 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 19:04:38,096 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 [2020-08-21 19:04:38,142 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 19:04:38,142 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 19:04:38,146 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 19:04:38,146 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 19:04:38,146 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 19:04:38,147 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 19:04:38,147 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 19:04:38,147 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 19:04:38,147 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 19:04:38,147 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 19:04:38,148 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 19:04:38,149 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 19:04:38,149 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 19:04:38,149 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 19:04:38,149 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 19:04:38,149 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 19:04:38,150 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 19:04:38,151 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 19:04:38,152 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 19:04:38,152 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 19:04:38,152 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 19:04:38,152 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 19:04:38,153 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 19:04:38,153 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 19:04:38,153 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 19:04:38,153 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 19:04:38,153 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 19:04:38,153 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 19:04:38,154 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 19:04:38,154 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=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; [2020-08-21 19:04:38,490 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 19:04:38,501 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 19:04:38,505 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 19:04:38,506 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 19:04:38,507 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 19:04:38,507 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-08-21 19:04:38,569 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e84195fff/8114448ca8cf435fb0b59d42718bb12b/FLAGa6c42e896 [2020-08-21 19:04:39,038 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 19:04:39,039 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-08-21 19:04:39,045 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e84195fff/8114448ca8cf435fb0b59d42718bb12b/FLAGa6c42e896 [2020-08-21 19:04:39,407 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e84195fff/8114448ca8cf435fb0b59d42718bb12b [2020-08-21 19:04:39,419 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 19:04:39,420 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 19:04:39,423 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 19:04:39,423 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 19:04:39,427 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 19:04:39,428 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:04:39" (1/1) ... [2020-08-21 19:04:39,431 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@656101fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:39, skipping insertion in model container [2020-08-21 19:04:39,432 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:04:39" (1/1) ... [2020-08-21 19:04:39,441 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 19:04:39,459 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 19:04:39,675 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:04:39,678 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 19:04:39,690 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:04:39,701 INFO L208 MainTranslator]: Completed translation [2020-08-21 19:04:39,701 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:39 WrapperNode [2020-08-21 19:04:39,701 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 19:04:39,702 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 19:04:39,702 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 19:04:39,702 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 19:04:39,712 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:39" (1/1) ... [2020-08-21 19:04:39,712 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:39" (1/1) ... [2020-08-21 19:04:39,716 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:39" (1/1) ... [2020-08-21 19:04:39,717 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:39" (1/1) ... [2020-08-21 19:04:39,719 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:39" (1/1) ... [2020-08-21 19:04:39,723 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:39" (1/1) ... [2020-08-21 19:04:39,724 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:39" (1/1) ... [2020-08-21 19:04:39,801 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 19:04:39,801 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 19:04:39,801 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 19:04:39,802 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 19:04:39,802 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:39" (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 [2020-08-21 19:04:39,859 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 19:04:39,859 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 19:04:39,859 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 19:04:39,859 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 19:04:39,859 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 19:04:39,859 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 19:04:39,860 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 19:04:39,860 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 19:04:39,860 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 19:04:40,027 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 19:04:40,027 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 19:04:40,031 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:04:40 BoogieIcfgContainer [2020-08-21 19:04:40,031 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 19:04:40,032 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 19:04:40,032 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 19:04:40,035 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 19:04:40,036 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 07:04:39" (1/3) ... [2020-08-21 19:04:40,036 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39e8e7a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:04:40, skipping insertion in model container [2020-08-21 19:04:40,037 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:39" (2/3) ... [2020-08-21 19:04:40,037 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39e8e7a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:04:40, skipping insertion in model container [2020-08-21 19:04:40,037 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:04:40" (3/3) ... [2020-08-21 19:04:40,039 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c [2020-08-21 19:04:40,050 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 19:04:40,057 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 19:04:40,071 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 19:04:40,090 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 19:04:40,091 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 19:04:40,091 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 19:04:40,091 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 19:04:40,091 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 19:04:40,091 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 19:04:40,091 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 19:04:40,092 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 19:04:40,106 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-21 19:04:40,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 19:04:40,111 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:40,112 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:40,113 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:40,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:40,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-21 19:04:40,124 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:40,125 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1473809045] [2020-08-21 19:04:40,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:40,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:40,474 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 5 [2020-08-21 19:04:40,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:40,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:40,482 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:40,483 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1473809045] [2020-08-21 19:04:40,485 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:04:40,485 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 19:04:40,486 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142962077] [2020-08-21 19:04:40,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 19:04:40,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:40,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 19:04:40,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 19:04:40,508 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-21 19:04:40,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:40,536 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 19:04:40,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 19:04:40,538 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 19:04:40,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:40,545 INFO L225 Difference]: With dead ends: 29 [2020-08-21 19:04:40,545 INFO L226 Difference]: Without dead ends: 12 [2020-08-21 19:04:40,549 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 19:04:40,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-21 19:04:40,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-21 19:04:40,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-21 19:04:40,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-21 19:04:40,587 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-21 19:04:40,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:40,588 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-21 19:04:40,588 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 19:04:40,588 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-21 19:04:40,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-21 19:04:40,589 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:40,589 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:40,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 19:04:40,590 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:40,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:40,590 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-21 19:04:40,591 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:40,591 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [923788282] [2020-08-21 19:04:40,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:40,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:40,689 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:40,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:40,694 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:40,695 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [923788282] [2020-08-21 19:04:40,695 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:40,695 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 19:04:40,696 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257774747] [2020-08-21 19:04:40,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 19:04:40,698 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:40,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 19:04:40,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:04:40,699 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-21 19:04:40,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:40,718 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-21 19:04:40,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 19:04:40,719 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-21 19:04:40,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:40,720 INFO L225 Difference]: With dead ends: 18 [2020-08-21 19:04:40,720 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 19:04:40,722 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 [2020-08-21 19:04:40,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 19:04:40,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 19:04:40,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 19:04:40,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-21 19:04:40,727 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-21 19:04:40,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:40,728 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-21 19:04:40,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 19:04:40,728 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-21 19:04:40,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 19:04:40,729 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:40,729 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:40,730 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 19:04:40,730 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:40,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:40,731 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-21 19:04:40,731 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:40,731 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1588333687] [2020-08-21 19:04:40,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:40,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:40,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:40,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:40,850 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:40,850 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1588333687] [2020-08-21 19:04:40,851 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:40,851 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 19:04:40,851 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605166115] [2020-08-21 19:04:40,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:04:40,852 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:40,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:04:40,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:04:40,853 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-21 19:04:40,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:40,875 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-21 19:04:40,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 19:04:40,876 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 19:04:40,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:40,877 INFO L225 Difference]: With dead ends: 19 [2020-08-21 19:04:40,877 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 19:04:40,878 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 [2020-08-21 19:04:40,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 19:04:40,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 19:04:40,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 19:04:40,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 19:04:40,884 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 19:04:40,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:40,884 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 19:04:40,884 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:04:40,885 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 19:04:40,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 19:04:40,885 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:40,886 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:40,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 19:04:40,886 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:40,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:40,887 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-21 19:04:40,887 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:40,887 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1303379697] [2020-08-21 19:04:40,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:40,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:41,045 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:41,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:41,051 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:41,055 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1303379697] [2020-08-21 19:04:41,055 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:41,057 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 19:04:41,057 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390638973] [2020-08-21 19:04:41,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 19:04:41,058 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:41,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 19:04:41,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:04:41,059 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-21 19:04:41,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:41,107 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-21 19:04:41,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 19:04:41,108 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-21 19:04:41,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:41,109 INFO L225 Difference]: With dead ends: 20 [2020-08-21 19:04:41,109 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 19:04:41,110 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:04:41,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 19:04:41,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 19:04:41,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 19:04:41,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 19:04:41,121 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-21 19:04:41,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:41,121 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 19:04:41,121 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 19:04:41,122 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 19:04:41,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 19:04:41,123 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:41,123 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:41,124 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 19:04:41,124 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:41,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:41,124 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-21 19:04:41,125 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:41,125 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [712439459] [2020-08-21 19:04:41,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:41,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:41,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:41,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:41,295 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:41,295 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [712439459] [2020-08-21 19:04:41,296 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:41,296 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 19:04:41,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744068001] [2020-08-21 19:04:41,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 19:04:41,303 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:41,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 19:04:41,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:04:41,304 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-21 19:04:41,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:41,359 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-21 19:04:41,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 19:04:41,361 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-21 19:04:41,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:41,362 INFO L225 Difference]: With dead ends: 21 [2020-08-21 19:04:41,362 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 19:04:41,363 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 [2020-08-21 19:04:41,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 19:04:41,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 19:04:41,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 19:04:41,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-21 19:04:41,374 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-21 19:04:41,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:41,375 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-21 19:04:41,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 19:04:41,375 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-21 19:04:41,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 19:04:41,376 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:41,376 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:41,377 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 19:04:41,377 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:41,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:41,378 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-21 19:04:41,378 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:41,379 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [562163719] [2020-08-21 19:04:41,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:41,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:41,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:41,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:41,533 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:04:41,534 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [562163719] [2020-08-21 19:04:41,534 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:41,534 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 19:04:41,534 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693016797] [2020-08-21 19:04:41,535 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 19:04:41,535 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:41,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 19:04:41,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 19:04:41,536 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-21 19:04:41,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:41,579 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 19:04:41,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 19:04:41,580 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-21 19:04:41,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:41,581 INFO L225 Difference]: With dead ends: 22 [2020-08-21 19:04:41,581 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 19:04:41,582 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 [2020-08-21 19:04:41,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 19:04:41,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 19:04:41,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 19:04:41,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 19:04:41,588 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-21 19:04:41,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:41,588 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 19:04:41,588 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 19:04:41,588 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 19:04:41,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 19:04:41,589 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:41,589 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:04:41,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 19:04:41,590 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:41,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:41,590 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-21 19:04:41,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:41,591 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [964747489] [2020-08-21 19:04:41,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:41,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 19:04:41,608 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 19:04:41,608 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 19:04:41,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 19:04:41,629 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 07:04:41 BoogieIcfgContainer [2020-08-21 19:04:41,629 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 19:04:41,631 INFO L168 Benchmark]: Toolchain (without parser) took 2211.02 ms. Allocated memory was 140.0 MB in the beginning and 235.9 MB in the end (delta: 95.9 MB). Free memory was 103.7 MB in the beginning and 192.1 MB in the end (delta: -88.4 MB). Peak memory consumption was 7.5 MB. Max. memory is 7.1 GB. [2020-08-21 19:04:41,632 INFO L168 Benchmark]: CDTParser took 0.23 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: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-08-21 19:04:41,633 INFO L168 Benchmark]: CACSL2BoogieTranslator took 278.95 ms. Allocated memory is still 140.0 MB. Free memory was 103.5 MB in the beginning and 94.1 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-08-21 19:04:41,634 INFO L168 Benchmark]: Boogie Preprocessor took 98.96 ms. Allocated memory was 140.0 MB in the beginning and 202.4 MB in the end (delta: 62.4 MB). Free memory was 94.1 MB in the beginning and 182.4 MB in the end (delta: -88.3 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. [2020-08-21 19:04:41,635 INFO L168 Benchmark]: RCFGBuilder took 229.76 ms. Allocated memory is still 202.4 MB. Free memory was 182.4 MB in the beginning and 170.3 MB in the end (delta: 12.0 MB). Peak memory consumption was 12.0 MB. Max. memory is 7.1 GB. [2020-08-21 19:04:41,636 INFO L168 Benchmark]: TraceAbstraction took 1597.30 ms. Allocated memory was 202.4 MB in the beginning and 235.9 MB in the end (delta: 33.6 MB). Free memory was 169.7 MB in the beginning and 192.1 MB in the end (delta: -22.5 MB). Peak memory consumption was 11.1 MB. Max. memory is 7.1 GB. [2020-08-21 19:04:41,640 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 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: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 278.95 ms. Allocated memory is still 140.0 MB. Free memory was 103.5 MB in the beginning and 94.1 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 98.96 ms. Allocated memory was 140.0 MB in the beginning and 202.4 MB in the end (delta: 62.4 MB). Free memory was 94.1 MB in the beginning and 182.4 MB in the end (delta: -88.3 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 229.76 ms. Allocated memory is still 202.4 MB. Free memory was 182.4 MB in the beginning and 170.3 MB in the end (delta: 12.0 MB). Peak memory consumption was 12.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1597.30 ms. Allocated memory was 202.4 MB in the beginning and 235.9 MB in the end (delta: 33.6 MB). Free memory was 169.7 MB in the beginning and 192.1 MB in the end (delta: -22.5 MB). Peak memory consumption was 11.1 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: 1.5s, 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, 0.6s 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, 0.8s 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...