/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=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 17:12:33,163 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 17:12:33,165 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 17:12:33,194 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 17:12:33,194 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 17:12:33,195 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 17:12:33,197 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 17:12:33,198 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 17:12:33,200 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 17:12:33,201 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 17:12:33,202 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 17:12:33,203 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 17:12:33,203 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 17:12:33,204 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 17:12:33,205 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 17:12:33,206 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 17:12:33,207 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 17:12:33,208 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 17:12:33,209 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 17:12:33,211 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 17:12:33,212 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 17:12:33,214 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 17:12:33,215 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 17:12:33,216 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 17:12:33,218 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 17:12:33,226 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 17:12:33,227 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 17:12:33,228 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 17:12:33,228 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 [2020-08-18 17:12:33,252 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 17:12:33,252 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 17:12:33,254 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 17:12:33,254 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 17:12:33,254 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 17:12:33,255 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 17:12:33,255 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 17:12:33,255 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 17:12:33,255 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 17:12:33,255 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 17:12:33,256 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 17:12:33,256 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 17:12:33,256 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 17:12:33,256 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 17:12:33,256 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 17:12:33,256 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 17:12:33,257 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 17:12:33,257 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 17:12:33,257 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 17:12:33,257 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 17:12:33,257 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 17:12:33,258 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 17:12:33,258 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 17:12:33,258 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 17:12:33,258 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 17:12:33,258 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 17:12:33,259 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 17:12:33,259 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 17:12:33,259 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 17:12:33,259 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=5;interpolation-heuristic=SMALLEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLEST; [2020-08-18 17:12:33,575 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 17:12:33,587 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 17:12:33,590 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 17:12:33,592 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 17:12:33,592 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 17:12:33,593 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-08-18 17:12:33,666 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4306b238b/7c2fb5de16f546ba9753a4212e7b53d4/FLAG2b6833366 [2020-08-18 17:12:34,149 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 17:12:34,150 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-08-18 17:12:34,157 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4306b238b/7c2fb5de16f546ba9753a4212e7b53d4/FLAG2b6833366 [2020-08-18 17:12:34,613 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4306b238b/7c2fb5de16f546ba9753a4212e7b53d4 [2020-08-18 17:12:34,623 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 17:12:34,625 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 17:12:34,626 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 17:12:34,626 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 17:12:34,630 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 17:12:34,631 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:12:34" (1/1) ... [2020-08-18 17:12:34,634 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@446f26ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:34, skipping insertion in model container [2020-08-18 17:12:34,635 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:12:34" (1/1) ... [2020-08-18 17:12:34,643 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 17:12:34,659 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 17:12:34,821 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:12:34,826 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 17:12:34,841 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:12:34,857 INFO L208 MainTranslator]: Completed translation [2020-08-18 17:12:34,858 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:34 WrapperNode [2020-08-18 17:12:34,858 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 17:12:34,859 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 17:12:34,859 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 17:12:34,859 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 17:12:34,874 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:34" (1/1) ... [2020-08-18 17:12:34,874 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:34" (1/1) ... [2020-08-18 17:12:34,880 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:34" (1/1) ... [2020-08-18 17:12:34,880 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:34" (1/1) ... [2020-08-18 17:12:34,964 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:34" (1/1) ... [2020-08-18 17:12:34,971 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:34" (1/1) ... [2020-08-18 17:12:34,972 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:34" (1/1) ... [2020-08-18 17:12:34,973 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 17:12:34,974 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 17:12:34,974 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 17:12:34,974 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 17:12:34,975 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:34" (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 [2020-08-18 17:12:35,035 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 17:12:35,035 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 17:12:35,035 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 17:12:35,036 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 17:12:35,036 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 17:12:35,036 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 17:12:35,036 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 17:12:35,036 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 17:12:35,037 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 17:12:35,207 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 17:12:35,208 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 17:12:35,211 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:12:35 BoogieIcfgContainer [2020-08-18 17:12:35,211 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 17:12:35,212 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 17:12:35,213 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 17:12:35,216 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 17:12:35,216 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 05:12:34" (1/3) ... [2020-08-18 17:12:35,217 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3118ffcc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:12:35, skipping insertion in model container [2020-08-18 17:12:35,217 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:34" (2/3) ... [2020-08-18 17:12:35,217 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3118ffcc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:12:35, skipping insertion in model container [2020-08-18 17:12:35,218 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:12:35" (3/3) ... [2020-08-18 17:12:35,219 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c [2020-08-18 17:12:35,230 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 17:12:35,237 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 17:12:35,250 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 17:12:35,271 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 17:12:35,271 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 17:12:35,271 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 17:12:35,271 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 17:12:35,272 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 17:12:35,272 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 17:12:35,272 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 17:12:35,272 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 17:12:35,287 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-18 17:12:35,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 17:12:35,292 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:35,293 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:35,293 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:35,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:35,298 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-18 17:12:35,305 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:35,306 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1267340557] [2020-08-18 17:12:35,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:35,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:35,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:35,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:35,489 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:35,490 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1267340557] [2020-08-18 17:12:35,492 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:12:35,493 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 17:12:35,494 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1513594020] [2020-08-18 17:12:35,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 17:12:35,500 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:35,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 17:12:35,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 17:12:35,520 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-18 17:12:35,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:35,606 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-18 17:12:35,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 17:12:35,608 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-18 17:12:35,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:35,617 INFO L225 Difference]: With dead ends: 29 [2020-08-18 17:12:35,617 INFO L226 Difference]: Without dead ends: 12 [2020-08-18 17:12:35,620 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 17:12:35,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-18 17:12:35,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-18 17:12:35,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-18 17:12:35,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-18 17:12:35,659 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-18 17:12:35,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:35,660 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-18 17:12:35,660 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 17:12:35,660 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-18 17:12:35,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-18 17:12:35,661 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:35,661 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:35,662 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 17:12:35,662 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:35,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:35,663 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-18 17:12:35,663 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:35,664 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [750744056] [2020-08-18 17:12:35,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:35,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:35,749 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:35,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:35,753 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:35,754 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [750744056] [2020-08-18 17:12:35,755 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:35,755 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 17:12:35,755 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329450110] [2020-08-18 17:12:35,757 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 17:12:35,757 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:35,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 17:12:35,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:12:35,758 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-18 17:12:35,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:35,778 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-18 17:12:35,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 17:12:35,779 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-18 17:12:35,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:35,780 INFO L225 Difference]: With dead ends: 18 [2020-08-18 17:12:35,780 INFO L226 Difference]: Without dead ends: 13 [2020-08-18 17:12:35,781 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 [2020-08-18 17:12:35,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-18 17:12:35,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-18 17:12:35,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 17:12:35,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-18 17:12:35,787 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-18 17:12:35,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:35,787 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-18 17:12:35,787 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 17:12:35,787 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-18 17:12:35,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 17:12:35,788 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:35,788 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:35,789 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 17:12:35,789 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:35,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:35,790 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-18 17:12:35,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:35,790 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1769450801] [2020-08-18 17:12:35,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:35,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:35,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:35,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:35,915 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:35,916 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1769450801] [2020-08-18 17:12:35,916 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:35,916 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 17:12:35,917 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411460849] [2020-08-18 17:12:35,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 17:12:35,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:35,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 17:12:35,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:12:35,918 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-18 17:12:35,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:35,958 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-18 17:12:35,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 17:12:35,961 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-18 17:12:35,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:35,962 INFO L225 Difference]: With dead ends: 19 [2020-08-18 17:12:35,962 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 17:12:35,963 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 [2020-08-18 17:12:35,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 17:12:35,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 17:12:35,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 17:12:35,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-18 17:12:35,973 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-18 17:12:35,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:35,973 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-18 17:12:35,973 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 17:12:35,974 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-18 17:12:35,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 17:12:35,975 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:35,975 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:35,975 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 17:12:35,976 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:35,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:35,977 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-18 17:12:35,977 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:35,978 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [42740051] [2020-08-18 17:12:35,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:36,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:36,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:36,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:36,112 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:36,113 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [42740051] [2020-08-18 17:12:36,113 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:36,113 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 17:12:36,114 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1984152176] [2020-08-18 17:12:36,114 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 17:12:36,114 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:36,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 17:12:36,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:12:36,115 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-18 17:12:36,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:36,141 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-18 17:12:36,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 17:12:36,142 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-18 17:12:36,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:36,142 INFO L225 Difference]: With dead ends: 20 [2020-08-18 17:12:36,143 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 17:12:36,143 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 [2020-08-18 17:12:36,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 17:12:36,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 17:12:36,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 17:12:36,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-18 17:12:36,148 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-18 17:12:36,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:36,149 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-18 17:12:36,149 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 17:12:36,149 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-18 17:12:36,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 17:12:36,150 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:36,150 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:36,150 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 17:12:36,150 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:36,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:36,151 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-18 17:12:36,151 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:36,151 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1815730997] [2020-08-18 17:12:36,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:36,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:36,261 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:36,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:36,266 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:36,266 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1815730997] [2020-08-18 17:12:36,266 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:36,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 17:12:36,267 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676483849] [2020-08-18 17:12:36,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 17:12:36,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:36,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 17:12:36,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 17:12:36,269 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-18 17:12:36,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:36,309 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-18 17:12:36,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 17:12:36,310 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-18 17:12:36,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:36,311 INFO L225 Difference]: With dead ends: 21 [2020-08-18 17:12:36,311 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 17:12:36,312 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 [2020-08-18 17:12:36,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 17:12:36,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 17:12:36,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 17:12:36,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-18 17:12:36,321 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-18 17:12:36,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:36,322 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-18 17:12:36,322 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 17:12:36,322 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-18 17:12:36,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 17:12:36,323 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:36,324 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:36,324 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 17:12:36,324 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:36,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:36,325 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-18 17:12:36,325 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:36,325 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2110275800] [2020-08-18 17:12:36,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:36,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:36,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:36,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:36,512 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:36,513 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2110275800] [2020-08-18 17:12:36,513 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:36,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 17:12:36,514 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816521031] [2020-08-18 17:12:36,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 17:12:36,514 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:36,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 17:12:36,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-08-18 17:12:36,515 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 10 states. [2020-08-18 17:12:36,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:36,572 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-18 17:12:36,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 17:12:36,573 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 15 [2020-08-18 17:12:36,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:36,574 INFO L225 Difference]: With dead ends: 22 [2020-08-18 17:12:36,574 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 17:12:36,575 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-08-18 17:12:36,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 17:12:36,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 17:12:36,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 17:12:36,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 17:12:36,581 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-18 17:12:36,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:36,581 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 17:12:36,581 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 17:12:36,581 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 17:12:36,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 17:12:36,582 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:36,582 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:36,583 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 17:12:36,583 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:36,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:36,583 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-18 17:12:36,583 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:36,584 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1314532215] [2020-08-18 17:12:36,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:36,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-18 17:12:36,601 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-18 17:12:36,601 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-18 17:12:36,605 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 17:12:36,620 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 05:12:36 BoogieIcfgContainer [2020-08-18 17:12:36,621 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 17:12:36,624 INFO L168 Benchmark]: Toolchain (without parser) took 1997.65 ms. Allocated memory was 141.0 MB in the beginning and 234.9 MB in the end (delta: 93.8 MB). Free memory was 104.0 MB in the beginning and 184.3 MB in the end (delta: -80.3 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. [2020-08-18 17:12:36,625 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 141.0 MB. Free memory was 122.6 MB in the beginning and 122.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-18 17:12:36,626 INFO L168 Benchmark]: CACSL2BoogieTranslator took 232.44 ms. Allocated memory is still 141.0 MB. Free memory was 103.6 MB in the beginning and 94.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-08-18 17:12:36,627 INFO L168 Benchmark]: Boogie Preprocessor took 114.85 ms. Allocated memory was 141.0 MB in the beginning and 202.9 MB in the end (delta: 61.9 MB). Free memory was 94.3 MB in the beginning and 182.0 MB in the end (delta: -87.7 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. [2020-08-18 17:12:36,628 INFO L168 Benchmark]: RCFGBuilder took 237.26 ms. Allocated memory is still 202.9 MB. Free memory was 182.0 MB in the beginning and 170.7 MB in the end (delta: 11.3 MB). Peak memory consumption was 11.3 MB. Max. memory is 7.1 GB. [2020-08-18 17:12:36,628 INFO L168 Benchmark]: TraceAbstraction took 1408.40 ms. Allocated memory was 202.9 MB in the beginning and 234.9 MB in the end (delta: 32.0 MB). Free memory was 170.1 MB in the beginning and 184.3 MB in the end (delta: -14.2 MB). Peak memory consumption was 17.8 MB. Max. memory is 7.1 GB. [2020-08-18 17:12:36,632 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 141.0 MB. Free memory was 122.6 MB in the beginning and 122.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 232.44 ms. Allocated memory is still 141.0 MB. Free memory was 103.6 MB in the beginning and 94.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 114.85 ms. Allocated memory was 141.0 MB in the beginning and 202.9 MB in the end (delta: 61.9 MB). Free memory was 94.3 MB in the beginning and 182.0 MB in the end (delta: -87.7 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 237.26 ms. Allocated memory is still 202.9 MB. Free memory was 182.0 MB in the beginning and 170.7 MB in the end (delta: 11.3 MB). Peak memory consumption was 11.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1408.40 ms. Allocated memory was 202.9 MB in the beginning and 234.9 MB in the end (delta: 32.0 MB). Free memory was 170.1 MB in the beginning and 184.3 MB in the end (delta: -14.2 MB). Peak memory consumption was 17.8 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(x != 6) [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: 1.3s, OverallIterations: 7, TraceHistogramMax: 6, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 66 SDtfs, 0 SDslu, 182 SDs, 0 SdLazy, 111 SolverSat, 15 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 48 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s 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, 0.6s InterpolantComputationTime, 91 NumberOfCodeBlocks, 91 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 69 ConstructedInterpolants, 0 QuantifiedInterpolants, 2689 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...