/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-lit/cggmp2005b.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 17:12:56,196 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-18 17:12:56,227 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 17:12:56,228 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 17:12:56,229 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 17:12:56,231 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 17:12:56,233 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 17:12:56,234 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 17:12:56,235 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 17:12:56,236 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 17:12:56,236 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 17:12:56,238 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 17:12:56,239 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 17:12:56,240 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 17:12:56,241 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 17:12:56,242 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 17:12:56,244 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 17:12:56,246 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 17:12:56,248 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 17:12:56,249 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 17:12:56,250 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 17:12:56,251 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 17:12:56,254 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 17:12:56,262 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 17:12:56,263 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 17:12:56,264 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 17:12:56,265 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 17:12:56,295 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 17:12:56,295 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 17:12:56,300 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 17:12:56,300 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 17:12:56,300 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 17:12:56,300 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 17:12:56,301 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 17:12:56,302 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 17:12:56,302 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 17:12:56,302 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 17:12:56,302 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 17:12:56,302 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 17:12:56,302 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 17:12:56,303 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 17:12:56,303 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 17:12:56,303 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 17:12:56,303 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 17:12:56,303 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 17:12:56,305 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 17:12:56,305 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 17:12:56,305 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 17:12:56,306 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 17:12:56,306 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 17:12:56,306 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 17:12:56,306 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 17:12:56,306 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 17:12:56,307 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 17:12:56,307 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 17:12:56,308 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 17:12:56,308 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 17:12:56,613 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 17:12:56,626 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 17:12:56,630 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 17:12:56,631 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 17:12:56,632 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 17:12:56,633 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-18 17:12:56,703 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8243d1c9c/d838213b81424d01a2691c9c33db26cd/FLAG13cf0ae1b [2020-08-18 17:12:57,161 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 17:12:57,164 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-18 17:12:57,170 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8243d1c9c/d838213b81424d01a2691c9c33db26cd/FLAG13cf0ae1b [2020-08-18 17:12:57,500 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8243d1c9c/d838213b81424d01a2691c9c33db26cd [2020-08-18 17:12:57,512 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 17:12:57,515 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 17:12:57,517 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 17:12:57,517 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 17:12:57,522 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 17:12:57,524 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:12:57" (1/1) ... [2020-08-18 17:12:57,528 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@411e9963 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:57, skipping insertion in model container [2020-08-18 17:12:57,528 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:12:57" (1/1) ... [2020-08-18 17:12:57,539 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 17:12:57,565 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 17:12:57,809 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:12:57,815 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 17:12:57,832 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:12:57,848 INFO L208 MainTranslator]: Completed translation [2020-08-18 17:12:57,848 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:57 WrapperNode [2020-08-18 17:12:57,848 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 17:12:57,849 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 17:12:57,849 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 17:12:57,849 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 17:12:57,860 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:57" (1/1) ... [2020-08-18 17:12:57,860 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:57" (1/1) ... [2020-08-18 17:12:57,947 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:57" (1/1) ... [2020-08-18 17:12:57,948 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:57" (1/1) ... [2020-08-18 17:12:57,951 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:57" (1/1) ... [2020-08-18 17:12:57,957 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:57" (1/1) ... [2020-08-18 17:12:57,958 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:57" (1/1) ... [2020-08-18 17:12:57,960 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 17:12:57,961 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 17:12:57,961 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 17:12:57,961 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 17:12:57,962 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:57" (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 17:12:58,027 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 17:12:58,027 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 17:12:58,027 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 17:12:58,027 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 17:12:58,027 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 17:12:58,028 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 17:12:58,028 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 17:12:58,028 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 17:12:58,028 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 17:12:58,028 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 17:12:58,028 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 17:12:58,028 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 17:12:58,028 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 17:12:58,219 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 17:12:58,219 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 17:12:58,223 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:12:58 BoogieIcfgContainer [2020-08-18 17:12:58,224 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 17:12:58,225 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 17:12:58,225 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 17:12:58,228 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 17:12:58,228 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 05:12:57" (1/3) ... [2020-08-18 17:12:58,229 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47330b53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:12:58, skipping insertion in model container [2020-08-18 17:12:58,230 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:57" (2/3) ... [2020-08-18 17:12:58,230 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47330b53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:12:58, skipping insertion in model container [2020-08-18 17:12:58,230 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:12:58" (3/3) ... [2020-08-18 17:12:58,232 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005b.i [2020-08-18 17:12:58,243 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 17:12:58,251 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 17:12:58,267 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 17:12:58,313 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 17:12:58,313 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 17:12:58,313 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 17:12:58,313 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 17:12:58,313 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 17:12:58,314 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 17:12:58,314 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 17:12:58,314 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 17:12:58,337 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-18 17:12:58,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 17:12:58,345 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:58,346 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:58,347 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:58,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:58,357 INFO L82 PathProgramCache]: Analyzing trace with hash -1039733575, now seen corresponding path program 1 times [2020-08-18 17:12:58,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:58,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1468047677] [2020-08-18 17:12:58,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:58,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:58,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:58,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:58,500 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 17:12:58,501 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1468047677] [2020-08-18 17:12:58,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:12:58,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-18 17:12:58,504 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939689179] [2020-08-18 17:12:58,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-18 17:12:58,510 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:58,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-18 17:12:58,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 17:12:58,527 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-08-18 17:12:58,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:58,553 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-08-18 17:12:58,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-18 17:12:58,555 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-18 17:12:58,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:58,564 INFO L225 Difference]: With dead ends: 37 [2020-08-18 17:12:58,564 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 17:12:58,568 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 17:12:58,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 17:12:58,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 17:12:58,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 17:12:58,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-08-18 17:12:58,610 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2020-08-18 17:12:58,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:58,610 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-08-18 17:12:58,611 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-18 17:12:58,611 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-08-18 17:12:58,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 17:12:58,611 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:58,612 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:58,612 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 17:12:58,612 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:58,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:58,613 INFO L82 PathProgramCache]: Analyzing trace with hash -1066515684, now seen corresponding path program 1 times [2020-08-18 17:12:58,613 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:58,614 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1071340177] [2020-08-18 17:12:58,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:58,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:58,661 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:58,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:58,665 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 17:12:58,666 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1071340177] [2020-08-18 17:12:58,666 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:12:58,666 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 17:12:58,667 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521926738] [2020-08-18 17:12:58,668 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 17:12:58,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:58,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 17:12:58,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 17:12:58,670 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-08-18 17:12:58,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:58,686 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-08-18 17:12:58,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 17:12:58,687 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-18 17:12:58,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:58,688 INFO L225 Difference]: With dead ends: 20 [2020-08-18 17:12:58,688 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 17:12:58,689 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 17:12:58,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 17:12:58,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 17:12:58,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 17:12:58,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-18 17:12:58,695 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2020-08-18 17:12:58,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:58,695 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-18 17:12:58,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 17:12:58,696 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-18 17:12:58,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 17:12:58,696 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:58,697 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:58,697 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 17:12:58,697 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:58,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:58,698 INFO L82 PathProgramCache]: Analyzing trace with hash 1875131310, now seen corresponding path program 1 times [2020-08-18 17:12:58,698 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:58,699 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [144117479] [2020-08-18 17:12:58,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:58,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:58,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:58,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:58,736 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:58,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [144117479] [2020-08-18 17:12:58,737 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:12:58,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 17:12:58,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694861777] [2020-08-18 17:12:58,738 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 17:12:58,738 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:58,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 17:12:58,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 17:12:58,739 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-18 17:12:58,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:58,749 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-08-18 17:12:58,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 17:12:58,750 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-08-18 17:12:58,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:58,751 INFO L225 Difference]: With dead ends: 25 [2020-08-18 17:12:58,751 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 17:12:58,752 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 17:12:58,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 17:12:58,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 17:12:58,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 17:12:58,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-18 17:12:58,758 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2020-08-18 17:12:58,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:58,758 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-18 17:12:58,758 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 17:12:58,759 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-18 17:12:58,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 17:12:58,759 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:58,759 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:58,760 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 17:12:58,760 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:58,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:58,760 INFO L82 PathProgramCache]: Analyzing trace with hash -224898986, now seen corresponding path program 1 times [2020-08-18 17:12:58,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:58,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [690693306] [2020-08-18 17:12:58,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:58,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:58,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:58,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:58,835 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:58,835 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [690693306] [2020-08-18 17:12:58,835 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:58,836 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 17:12:58,836 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548740838] [2020-08-18 17:12:58,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 17:12:58,837 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:58,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 17:12:58,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:12:58,838 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-08-18 17:12:58,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:58,893 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-08-18 17:12:58,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 17:12:58,894 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-08-18 17:12:58,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:58,895 INFO L225 Difference]: With dead ends: 26 [2020-08-18 17:12:58,895 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 17:12:58,896 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-08-18 17:12:58,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 17:12:58,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 17:12:58,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 17:12:58,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-18 17:12:58,902 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2020-08-18 17:12:58,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:58,902 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-18 17:12:58,902 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 17:12:58,902 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-18 17:12:58,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 17:12:58,903 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:58,903 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:58,903 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 17:12:58,904 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:58,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:58,904 INFO L82 PathProgramCache]: Analyzing trace with hash -901328722, now seen corresponding path program 2 times [2020-08-18 17:12:58,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:58,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1318075409] [2020-08-18 17:12:58,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:58,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:58,994 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:58,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:58,998 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:58,999 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1318075409] [2020-08-18 17:12:58,999 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:59,000 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 17:12:59,000 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400037103] [2020-08-18 17:12:59,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 17:12:59,001 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:59,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 17:12:59,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:12:59,002 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-08-18 17:12:59,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:59,082 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-18 17:12:59,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 17:12:59,083 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-18 17:12:59,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:59,084 INFO L225 Difference]: With dead ends: 27 [2020-08-18 17:12:59,084 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 17:12:59,085 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2020-08-18 17:12:59,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 17:12:59,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 17:12:59,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 17:12:59,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-18 17:12:59,091 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 16 [2020-08-18 17:12:59,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:59,091 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-18 17:12:59,091 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 17:12:59,091 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-18 17:12:59,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 17:12:59,092 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:59,092 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:59,093 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 17:12:59,093 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:59,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:59,093 INFO L82 PathProgramCache]: Analyzing trace with hash -395814058, now seen corresponding path program 3 times [2020-08-18 17:12:59,094 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:59,094 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1363504200] [2020-08-18 17:12:59,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:59,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:59,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:59,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:59,179 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:59,179 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1363504200] [2020-08-18 17:12:59,179 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:59,180 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 17:12:59,180 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607145395] [2020-08-18 17:12:59,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 17:12:59,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:59,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 17:12:59,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 17:12:59,182 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2020-08-18 17:12:59,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:59,289 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-08-18 17:12:59,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 17:12:59,290 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-08-18 17:12:59,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:59,291 INFO L225 Difference]: With dead ends: 28 [2020-08-18 17:12:59,291 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 17:12:59,292 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-18 17:12:59,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 17:12:59,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 17:12:59,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 17:12:59,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-08-18 17:12:59,299 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2020-08-18 17:12:59,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:59,299 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-08-18 17:12:59,300 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 17:12:59,300 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-08-18 17:12:59,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 17:12:59,301 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:59,301 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:59,301 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 17:12:59,302 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:59,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:59,302 INFO L82 PathProgramCache]: Analyzing trace with hash -1904728658, now seen corresponding path program 4 times [2020-08-18 17:12:59,302 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:59,303 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [431937741] [2020-08-18 17:12:59,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:59,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:59,399 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:59,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:59,402 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:59,404 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [431937741] [2020-08-18 17:12:59,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:59,405 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 17:12:59,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401398573] [2020-08-18 17:12:59,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 17:12:59,407 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:59,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 17:12:59,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-18 17:12:59,409 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 8 states. [2020-08-18 17:12:59,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:59,569 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-18 17:12:59,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 17:12:59,571 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-08-18 17:12:59,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:59,572 INFO L225 Difference]: With dead ends: 29 [2020-08-18 17:12:59,572 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 17:12:59,573 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2020-08-18 17:12:59,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 17:12:59,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 17:12:59,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 17:12:59,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-18 17:12:59,585 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2020-08-18 17:12:59,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:59,586 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-18 17:12:59,586 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 17:12:59,586 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-18 17:12:59,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 17:12:59,587 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:59,587 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:59,587 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 17:12:59,588 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:59,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:59,589 INFO L82 PathProgramCache]: Analyzing trace with hash -1436441002, now seen corresponding path program 5 times [2020-08-18 17:12:59,589 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:59,589 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1137270992] [2020-08-18 17:12:59,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:59,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:59,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:59,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:59,681 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:59,681 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1137270992] [2020-08-18 17:12:59,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:59,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 17:12:59,682 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588900989] [2020-08-18 17:12:59,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 17:12:59,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:59,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 17:12:59,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-08-18 17:12:59,684 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2020-08-18 17:12:59,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:59,847 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-18 17:12:59,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 17:12:59,848 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-18 17:12:59,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:59,849 INFO L225 Difference]: With dead ends: 30 [2020-08-18 17:12:59,849 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 17:12:59,851 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2020-08-18 17:12:59,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 17:12:59,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 17:12:59,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 17:12:59,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-08-18 17:12:59,861 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 19 [2020-08-18 17:12:59,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:59,861 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-08-18 17:12:59,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 17:12:59,861 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-08-18 17:12:59,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 17:12:59,862 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:59,862 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:59,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 17:12:59,863 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:59,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:59,863 INFO L82 PathProgramCache]: Analyzing trace with hash 195574446, now seen corresponding path program 6 times [2020-08-18 17:12:59,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:59,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1430783905] [2020-08-18 17:12:59,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:59,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:59,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:59,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:59,924 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 17:12:59,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1430783905] [2020-08-18 17:12:59,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:59,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 17:12:59,925 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307845012] [2020-08-18 17:12:59,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 17:12:59,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:59,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 17:12:59,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:12:59,927 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 4 states. [2020-08-18 17:12:59,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:59,945 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-18 17:12:59,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 17:12:59,945 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-18 17:12:59,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:59,946 INFO L225 Difference]: With dead ends: 30 [2020-08-18 17:12:59,946 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 17:12:59,947 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 17:12:59,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 17:12:59,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 17:12:59,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 17:12:59,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-08-18 17:12:59,957 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 20 [2020-08-18 17:12:59,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:59,957 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-08-18 17:12:59,957 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 17:12:59,957 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-08-18 17:12:59,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 17:12:59,958 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:59,958 INFO L422 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:59,959 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 17:12:59,959 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:59,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:59,959 INFO L82 PathProgramCache]: Analyzing trace with hash 389290560, now seen corresponding path program 7 times [2020-08-18 17:12:59,960 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:59,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [283035129] [2020-08-18 17:12:59,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:59,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:59,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:59,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:59,995 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 17:12:59,996 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [283035129] [2020-08-18 17:12:59,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:59,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 17:12:59,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024582507] [2020-08-18 17:12:59,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 17:12:59,997 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:59,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 17:12:59,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:12:59,998 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-08-18 17:13:00,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:00,017 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2020-08-18 17:13:00,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 17:13:00,018 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-08-18 17:13:00,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:00,019 INFO L225 Difference]: With dead ends: 34 [2020-08-18 17:13:00,019 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 17:13:00,020 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:13:00,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 17:13:00,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 17:13:00,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 17:13:00,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2020-08-18 17:13:00,026 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 24 [2020-08-18 17:13:00,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:00,026 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2020-08-18 17:13:00,026 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 17:13:00,027 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2020-08-18 17:13:00,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 17:13:00,027 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:00,028 INFO L422 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:00,028 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 17:13:00,028 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:00,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:00,029 INFO L82 PathProgramCache]: Analyzing trace with hash -1279139630, now seen corresponding path program 8 times [2020-08-18 17:13:00,029 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:00,029 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [311645436] [2020-08-18 17:13:00,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:00,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:00,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:00,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:00,094 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 17:13:00,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [311645436] [2020-08-18 17:13:00,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:00,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 17:13:00,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195954988] [2020-08-18 17:13:00,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 17:13:00,097 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:00,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 17:13:00,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:13:00,098 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand 6 states. [2020-08-18 17:13:00,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:00,142 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-08-18 17:13:00,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 17:13:00,143 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-08-18 17:13:00,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:00,144 INFO L225 Difference]: With dead ends: 38 [2020-08-18 17:13:00,144 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 17:13:00,144 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:13:00,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 17:13:00,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-18 17:13:00,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 17:13:00,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-08-18 17:13:00,151 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 28 [2020-08-18 17:13:00,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:00,151 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-08-18 17:13:00,151 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 17:13:00,151 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-08-18 17:13:00,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 17:13:00,152 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:00,152 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:00,152 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 17:13:00,153 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:00,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:00,153 INFO L82 PathProgramCache]: Analyzing trace with hash 805703268, now seen corresponding path program 9 times [2020-08-18 17:13:00,153 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:00,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2117715348] [2020-08-18 17:13:00,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:00,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:00,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:00,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:00,240 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 25 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 17:13:00,240 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2117715348] [2020-08-18 17:13:00,241 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:00,241 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 17:13:00,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265371224] [2020-08-18 17:13:00,242 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 17:13:00,242 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:00,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 17:13:00,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-18 17:13:00,243 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 10 states. [2020-08-18 17:13:00,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:00,442 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2020-08-18 17:13:00,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 17:13:00,443 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2020-08-18 17:13:00,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:00,444 INFO L225 Difference]: With dead ends: 54 [2020-08-18 17:13:00,444 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 17:13:00,445 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-08-18 17:13:00,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 17:13:00,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 17:13:00,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 17:13:00,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-18 17:13:00,451 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 32 [2020-08-18 17:13:00,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:00,452 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-18 17:13:00,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 17:13:00,452 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-18 17:13:00,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 17:13:00,453 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:00,453 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:00,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 17:13:00,454 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:00,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:00,454 INFO L82 PathProgramCache]: Analyzing trace with hash 1833781516, now seen corresponding path program 10 times [2020-08-18 17:13:00,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:00,455 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2092241126] [2020-08-18 17:13:00,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:00,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:00,556 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:00,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:00,560 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 17:13:00,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2092241126] [2020-08-18 17:13:00,560 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:00,561 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 17:13:00,561 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788276366] [2020-08-18 17:13:00,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 17:13:00,561 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:00,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 17:13:00,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-08-18 17:13:00,562 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 11 states. [2020-08-18 17:13:00,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:00,769 INFO L93 Difference]: Finished difference Result 55 states and 71 transitions. [2020-08-18 17:13:00,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 17:13:00,770 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2020-08-18 17:13:00,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:00,770 INFO L225 Difference]: With dead ends: 55 [2020-08-18 17:13:00,770 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 17:13:00,771 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=234, Unknown=0, NotChecked=0, Total=342 [2020-08-18 17:13:00,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 17:13:00,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 17:13:00,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 17:13:00,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2020-08-18 17:13:00,777 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 33 [2020-08-18 17:13:00,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:00,778 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2020-08-18 17:13:00,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 17:13:00,778 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2020-08-18 17:13:00,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 17:13:00,779 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:00,779 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:00,779 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 17:13:00,779 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:00,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:00,779 INFO L82 PathProgramCache]: Analyzing trace with hash -655531164, now seen corresponding path program 11 times [2020-08-18 17:13:00,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:00,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1313025734] [2020-08-18 17:13:00,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:00,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:00,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:00,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:00,882 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 31 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 17:13:00,883 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1313025734] [2020-08-18 17:13:00,883 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:00,883 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 17:13:00,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195438117] [2020-08-18 17:13:00,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 17:13:00,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:00,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 17:13:00,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2020-08-18 17:13:00,885 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand 12 states. [2020-08-18 17:13:01,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:01,126 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2020-08-18 17:13:01,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 17:13:01,127 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-18 17:13:01,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:01,128 INFO L225 Difference]: With dead ends: 56 [2020-08-18 17:13:01,128 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 17:13:01,129 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2020-08-18 17:13:01,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 17:13:01,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-18 17:13:01,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 17:13:01,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2020-08-18 17:13:01,135 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 34 [2020-08-18 17:13:01,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:01,135 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2020-08-18 17:13:01,135 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 17:13:01,135 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2020-08-18 17:13:01,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 17:13:01,136 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:01,136 INFO L422 BasicCegarLoop]: trace histogram [9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:01,137 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 17:13:01,137 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:01,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:01,137 INFO L82 PathProgramCache]: Analyzing trace with hash -514812916, now seen corresponding path program 12 times [2020-08-18 17:13:01,137 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:01,138 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1388786257] [2020-08-18 17:13:01,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:01,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:01,272 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:01,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:01,275 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 34 proven. 45 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 17:13:01,276 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1388786257] [2020-08-18 17:13:01,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:01,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 17:13:01,276 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541950357] [2020-08-18 17:13:01,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 17:13:01,277 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:01,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 17:13:01,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-08-18 17:13:01,277 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand 13 states. [2020-08-18 17:13:01,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:01,545 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2020-08-18 17:13:01,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 17:13:01,546 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-08-18 17:13:01,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:01,547 INFO L225 Difference]: With dead ends: 57 [2020-08-18 17:13:01,547 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 17:13:01,548 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2020-08-18 17:13:01,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 17:13:01,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 17:13:01,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 17:13:01,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2020-08-18 17:13:01,554 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 35 [2020-08-18 17:13:01,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:01,555 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2020-08-18 17:13:01,555 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 17:13:01,555 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2020-08-18 17:13:01,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 17:13:01,556 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:01,556 INFO L422 BasicCegarLoop]: trace histogram [10, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:01,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 17:13:01,556 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:01,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:01,557 INFO L82 PathProgramCache]: Analyzing trace with hash -447514524, now seen corresponding path program 13 times [2020-08-18 17:13:01,557 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:01,557 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1201049201] [2020-08-18 17:13:01,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:01,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:01,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:01,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:01,697 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 37 proven. 55 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 17:13:01,698 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1201049201] [2020-08-18 17:13:01,698 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:01,698 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 17:13:01,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991689900] [2020-08-18 17:13:01,699 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 17:13:01,699 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:01,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 17:13:01,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-08-18 17:13:01,700 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand 14 states. [2020-08-18 17:13:02,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:02,052 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2020-08-18 17:13:02,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 17:13:02,055 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-18 17:13:02,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:02,056 INFO L225 Difference]: With dead ends: 58 [2020-08-18 17:13:02,056 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 17:13:02,057 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2020-08-18 17:13:02,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 17:13:02,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 17:13:02,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 17:13:02,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-08-18 17:13:02,072 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 36 [2020-08-18 17:13:02,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:02,072 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-08-18 17:13:02,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 17:13:02,073 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-08-18 17:13:02,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 17:13:02,073 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:02,073 INFO L422 BasicCegarLoop]: trace histogram [11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:02,074 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 17:13:02,077 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:02,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:02,077 INFO L82 PathProgramCache]: Analyzing trace with hash 1638735628, now seen corresponding path program 14 times [2020-08-18 17:13:02,077 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:02,078 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1401417618] [2020-08-18 17:13:02,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:02,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:02,258 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:02,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:02,265 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 40 proven. 66 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 17:13:02,265 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1401417618] [2020-08-18 17:13:02,265 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:02,266 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 17:13:02,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325343266] [2020-08-18 17:13:02,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 17:13:02,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:02,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 17:13:02,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2020-08-18 17:13:02,269 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 15 states. [2020-08-18 17:13:02,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:02,640 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2020-08-18 17:13:02,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 17:13:02,640 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-18 17:13:02,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:02,641 INFO L225 Difference]: With dead ends: 59 [2020-08-18 17:13:02,641 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 17:13:02,642 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2020-08-18 17:13:02,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 17:13:02,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 17:13:02,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 17:13:02,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2020-08-18 17:13:02,651 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 37 [2020-08-18 17:13:02,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:02,652 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2020-08-18 17:13:02,652 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 17:13:02,652 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2020-08-18 17:13:02,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 17:13:02,653 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:02,654 INFO L422 BasicCegarLoop]: trace histogram [12, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:02,654 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 17:13:02,654 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:02,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:02,654 INFO L82 PathProgramCache]: Analyzing trace with hash 1887980900, now seen corresponding path program 15 times [2020-08-18 17:13:02,655 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:02,655 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2112441596] [2020-08-18 17:13:02,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:02,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:02,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:02,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:02,852 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 43 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 17:13:02,852 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2112441596] [2020-08-18 17:13:02,852 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:02,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 17:13:02,853 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837352384] [2020-08-18 17:13:02,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 17:13:02,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:02,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 17:13:02,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2020-08-18 17:13:02,861 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand 16 states. [2020-08-18 17:13:03,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:03,274 INFO L93 Difference]: Finished difference Result 60 states and 76 transitions. [2020-08-18 17:13:03,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 17:13:03,275 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-18 17:13:03,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:03,276 INFO L225 Difference]: With dead ends: 60 [2020-08-18 17:13:03,276 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 17:13:03,278 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=238, Invalid=574, Unknown=0, NotChecked=0, Total=812 [2020-08-18 17:13:03,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 17:13:03,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 17:13:03,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 17:13:03,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-08-18 17:13:03,290 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 38 [2020-08-18 17:13:03,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:03,290 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-08-18 17:13:03,290 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 17:13:03,290 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-08-18 17:13:03,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 17:13:03,291 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:03,291 INFO L422 BasicCegarLoop]: trace histogram [13, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:03,291 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 17:13:03,292 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:03,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:03,292 INFO L82 PathProgramCache]: Analyzing trace with hash 1024649740, now seen corresponding path program 16 times [2020-08-18 17:13:03,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:03,293 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [36325115] [2020-08-18 17:13:03,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:03,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:03,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:03,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:03,476 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 46 proven. 91 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 17:13:03,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [36325115] [2020-08-18 17:13:03,477 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:03,477 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 17:13:03,477 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972803406] [2020-08-18 17:13:03,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 17:13:03,478 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:03,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 17:13:03,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2020-08-18 17:13:03,484 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 17 states. [2020-08-18 17:13:04,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:04,003 INFO L93 Difference]: Finished difference Result 61 states and 77 transitions. [2020-08-18 17:13:04,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 17:13:04,004 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2020-08-18 17:13:04,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:04,004 INFO L225 Difference]: With dead ends: 61 [2020-08-18 17:13:04,004 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 17:13:04,005 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=270, Invalid=660, Unknown=0, NotChecked=0, Total=930 [2020-08-18 17:13:04,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 17:13:04,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 17:13:04,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 17:13:04,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2020-08-18 17:13:04,013 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 39 [2020-08-18 17:13:04,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:04,013 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2020-08-18 17:13:04,013 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 17:13:04,013 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2020-08-18 17:13:04,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 17:13:04,014 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:04,014 INFO L422 BasicCegarLoop]: trace histogram [14, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:04,014 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 17:13:04,014 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:04,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:04,015 INFO L82 PathProgramCache]: Analyzing trace with hash 31187556, now seen corresponding path program 17 times [2020-08-18 17:13:04,015 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:04,015 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [517349394] [2020-08-18 17:13:04,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:04,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:04,230 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:04,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:04,233 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 49 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 17:13:04,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [517349394] [2020-08-18 17:13:04,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:04,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 17:13:04,234 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812180021] [2020-08-18 17:13:04,234 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 17:13:04,235 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:04,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 17:13:04,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2020-08-18 17:13:04,235 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 18 states. [2020-08-18 17:13:04,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:04,808 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2020-08-18 17:13:04,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 17:13:04,809 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-18 17:13:04,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:04,810 INFO L225 Difference]: With dead ends: 62 [2020-08-18 17:13:04,810 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 17:13:04,811 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=304, Invalid=752, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 17:13:04,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 17:13:04,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-18 17:13:04,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 17:13:04,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2020-08-18 17:13:04,818 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 40 [2020-08-18 17:13:04,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:04,819 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2020-08-18 17:13:04,819 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 17:13:04,819 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2020-08-18 17:13:04,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 17:13:04,819 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:04,820 INFO L422 BasicCegarLoop]: trace histogram [15, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:04,820 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 17:13:04,820 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:04,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:04,821 INFO L82 PathProgramCache]: Analyzing trace with hash -701369076, now seen corresponding path program 18 times [2020-08-18 17:13:04,821 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:04,821 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1942757167] [2020-08-18 17:13:04,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:04,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:05,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:05,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:05,057 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 52 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 17:13:05,057 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1942757167] [2020-08-18 17:13:05,057 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:05,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 17:13:05,058 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106602867] [2020-08-18 17:13:05,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 17:13:05,058 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:05,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 17:13:05,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2020-08-18 17:13:05,059 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 19 states. [2020-08-18 17:13:05,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:05,683 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-18 17:13:05,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 17:13:05,684 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 41 [2020-08-18 17:13:05,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:05,684 INFO L225 Difference]: With dead ends: 63 [2020-08-18 17:13:05,684 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 17:13:05,685 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 17:13:05,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 17:13:05,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 17:13:05,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 17:13:05,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2020-08-18 17:13:05,692 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 41 [2020-08-18 17:13:05,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:05,692 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2020-08-18 17:13:05,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 17:13:05,692 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2020-08-18 17:13:05,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 17:13:05,693 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:05,693 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:05,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 17:13:05,693 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:05,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:05,694 INFO L82 PathProgramCache]: Analyzing trace with hash -1935788188, now seen corresponding path program 19 times [2020-08-18 17:13:05,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:05,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2074528813] [2020-08-18 17:13:05,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:05,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:05,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:05,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:05,959 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 55 proven. 136 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 17:13:05,959 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2074528813] [2020-08-18 17:13:05,960 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:05,960 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 17:13:05,960 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603258550] [2020-08-18 17:13:05,960 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 17:13:05,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:05,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 17:13:05,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2020-08-18 17:13:05,961 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 20 states. [2020-08-18 17:13:06,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:06,666 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2020-08-18 17:13:06,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 17:13:06,668 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2020-08-18 17:13:06,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:06,669 INFO L225 Difference]: With dead ends: 64 [2020-08-18 17:13:06,669 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 17:13:06,670 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=378, Invalid=954, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 17:13:06,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 17:13:06,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 17:13:06,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 17:13:06,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2020-08-18 17:13:06,678 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 42 [2020-08-18 17:13:06,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:06,678 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2020-08-18 17:13:06,678 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 17:13:06,678 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2020-08-18 17:13:06,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 17:13:06,679 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:06,679 INFO L422 BasicCegarLoop]: trace histogram [17, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:06,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 17:13:06,679 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:06,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:06,680 INFO L82 PathProgramCache]: Analyzing trace with hash -1548074996, now seen corresponding path program 20 times [2020-08-18 17:13:06,680 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:06,680 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [371773439] [2020-08-18 17:13:06,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:06,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:06,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:06,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:06,961 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 58 proven. 153 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 17:13:06,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [371773439] [2020-08-18 17:13:06,961 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:06,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 17:13:06,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45860586] [2020-08-18 17:13:06,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 17:13:06,962 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:06,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 17:13:06,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2020-08-18 17:13:06,963 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand 21 states. [2020-08-18 17:13:07,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:07,752 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2020-08-18 17:13:07,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 17:13:07,753 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-08-18 17:13:07,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:07,753 INFO L225 Difference]: With dead ends: 65 [2020-08-18 17:13:07,754 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 17:13:07,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=418, Invalid=1064, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 17:13:07,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 17:13:07,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-18 17:13:07,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 17:13:07,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2020-08-18 17:13:07,763 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 43 [2020-08-18 17:13:07,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:07,763 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2020-08-18 17:13:07,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 17:13:07,763 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2020-08-18 17:13:07,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 17:13:07,764 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:07,764 INFO L422 BasicCegarLoop]: trace histogram [18, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:07,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 17:13:07,764 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:07,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:07,765 INFO L82 PathProgramCache]: Analyzing trace with hash 1881099364, now seen corresponding path program 21 times [2020-08-18 17:13:07,765 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:07,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1937813735] [2020-08-18 17:13:07,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:07,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:08,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:08,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:08,037 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 61 proven. 171 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 17:13:08,037 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1937813735] [2020-08-18 17:13:08,037 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:08,037 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 17:13:08,038 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321111036] [2020-08-18 17:13:08,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 17:13:08,038 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:08,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 17:13:08,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2020-08-18 17:13:08,039 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 22 states. [2020-08-18 17:13:08,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:08,902 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-18 17:13:08,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 17:13:08,902 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 44 [2020-08-18 17:13:08,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:08,903 INFO L225 Difference]: With dead ends: 66 [2020-08-18 17:13:08,903 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 17:13:08,904 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 17:13:08,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 17:13:08,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 17:13:08,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 17:13:08,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2020-08-18 17:13:08,913 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 44 [2020-08-18 17:13:08,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:08,913 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2020-08-18 17:13:08,913 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 17:13:08,913 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2020-08-18 17:13:08,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 17:13:08,914 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:08,914 INFO L422 BasicCegarLoop]: trace histogram [19, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:08,915 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 17:13:08,917 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:08,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:08,918 INFO L82 PathProgramCache]: Analyzing trace with hash 811322124, now seen corresponding path program 22 times [2020-08-18 17:13:08,918 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:08,918 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1294480842] [2020-08-18 17:13:08,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:08,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:09,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:09,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:09,249 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 64 proven. 190 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 17:13:09,249 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1294480842] [2020-08-18 17:13:09,249 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:09,249 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 17:13:09,249 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310188341] [2020-08-18 17:13:09,250 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 17:13:09,250 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:09,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 17:13:09,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2020-08-18 17:13:09,251 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 23 states. [2020-08-18 17:13:10,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:10,283 INFO L93 Difference]: Finished difference Result 67 states and 83 transitions. [2020-08-18 17:13:10,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 17:13:10,283 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 45 [2020-08-18 17:13:10,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:10,284 INFO L225 Difference]: With dead ends: 67 [2020-08-18 17:13:10,284 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 17:13:10,285 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=504, Invalid=1302, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 17:13:10,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 17:13:10,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 17:13:10,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 17:13:10,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2020-08-18 17:13:10,293 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 45 [2020-08-18 17:13:10,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:10,293 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2020-08-18 17:13:10,293 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 17:13:10,294 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2020-08-18 17:13:10,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 17:13:10,294 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:10,294 INFO L422 BasicCegarLoop]: trace histogram [20, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:10,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 17:13:10,295 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:10,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:10,295 INFO L82 PathProgramCache]: Analyzing trace with hash 2007966052, now seen corresponding path program 23 times [2020-08-18 17:13:10,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:10,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1170418737] [2020-08-18 17:13:10,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:10,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:10,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:10,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:10,639 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 67 proven. 210 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 17:13:10,639 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1170418737] [2020-08-18 17:13:10,639 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:10,639 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 17:13:10,640 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606803437] [2020-08-18 17:13:10,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 17:13:10,640 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:10,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 17:13:10,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2020-08-18 17:13:10,641 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 24 states. [2020-08-18 17:13:11,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:11,698 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-08-18 17:13:11,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 17:13:11,701 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2020-08-18 17:13:11,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:11,702 INFO L225 Difference]: With dead ends: 68 [2020-08-18 17:13:11,702 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 17:13:11,703 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 17:13:11,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 17:13:11,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-18 17:13:11,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 17:13:11,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2020-08-18 17:13:11,711 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 46 [2020-08-18 17:13:11,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:11,711 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2020-08-18 17:13:11,711 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 17:13:11,712 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2020-08-18 17:13:11,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 17:13:11,712 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:11,712 INFO L422 BasicCegarLoop]: trace histogram [21, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:11,712 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 17:13:11,713 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:11,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:11,713 INFO L82 PathProgramCache]: Analyzing trace with hash 449222156, now seen corresponding path program 24 times [2020-08-18 17:13:11,713 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:11,713 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1849186454] [2020-08-18 17:13:11,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:11,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:12,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:12,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:12,131 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 70 proven. 231 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-18 17:13:12,131 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1849186454] [2020-08-18 17:13:12,132 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:12,132 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 17:13:12,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97513588] [2020-08-18 17:13:12,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 17:13:12,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:12,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 17:13:12,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2020-08-18 17:13:12,134 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand 25 states. [2020-08-18 17:13:13,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:13,260 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2020-08-18 17:13:13,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 17:13:13,261 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 47 [2020-08-18 17:13:13,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:13,261 INFO L225 Difference]: With dead ends: 69 [2020-08-18 17:13:13,261 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 17:13:13,263 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=598, Invalid=1564, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 17:13:13,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 17:13:13,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 17:13:13,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 17:13:13,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2020-08-18 17:13:13,270 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 47 [2020-08-18 17:13:13,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:13,270 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2020-08-18 17:13:13,270 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 17:13:13,270 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2020-08-18 17:13:13,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 17:13:13,271 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:13,271 INFO L422 BasicCegarLoop]: trace histogram [22, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:13,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 17:13:13,271 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:13,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:13,272 INFO L82 PathProgramCache]: Analyzing trace with hash -627198364, now seen corresponding path program 25 times [2020-08-18 17:13:13,272 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:13,272 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1411418683] [2020-08-18 17:13:13,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:13,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:13,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:13,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:13,318 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-08-18 17:13:13,318 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1411418683] [2020-08-18 17:13:13,318 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:13:13,318 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 17:13:13,318 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335502053] [2020-08-18 17:13:13,318 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 17:13:13,319 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:13,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 17:13:13,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:13:13,319 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 5 states. [2020-08-18 17:13:13,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:13,346 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-18 17:13:13,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 17:13:13,346 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 48 [2020-08-18 17:13:13,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:13,346 INFO L225 Difference]: With dead ends: 66 [2020-08-18 17:13:13,347 INFO L226 Difference]: Without dead ends: 0 [2020-08-18 17:13:13,347 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:13:13,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-18 17:13:13,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-18 17:13:13,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-18 17:13:13,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-18 17:13:13,348 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 48 [2020-08-18 17:13:13,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:13,348 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-18 17:13:13,348 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 17:13:13,348 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-18 17:13:13,348 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-18 17:13:13,349 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 17:13:13,351 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-18 17:13:13,529 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-18 17:13:13,529 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-18 17:13:13,529 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-18 17:13:13,529 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-18 17:13:13,529 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-18 17:13:13,530 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-18 17:13:13,530 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-08-18 17:13:13,530 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-08-18 17:13:13,530 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-08-18 17:13:13,530 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-08-18 17:13:13,530 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 30) no Hoare annotation was computed. [2020-08-18 17:13:13,530 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 30) no Hoare annotation was computed. [2020-08-18 17:13:13,531 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 30) the Hoare annotation is: true [2020-08-18 17:13:13,531 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-08-18 17:13:13,531 INFO L264 CegarLoopResult]: At program point L24-2(lines 24 26) the Hoare annotation is: (= main_~k~0 4) [2020-08-18 17:13:13,531 INFO L264 CegarLoopResult]: At program point L24-3(lines 18 27) the Hoare annotation is: (or (= main_~k~0 4) (and (<= main_~i~0 0) (<= (+ main_~j~0 100) 0))) [2020-08-18 17:13:13,531 INFO L264 CegarLoopResult]: At program point L20-2(lines 20 22) the Hoare annotation is: (or (= main_~k~0 4) (<= main_~i~0 1)) [2020-08-18 17:13:13,532 INFO L268 CegarLoopResult]: For program point L20-3(lines 20 22) no Hoare annotation was computed. [2020-08-18 17:13:13,532 INFO L264 CegarLoopResult]: At program point L18-2(lines 18 27) the Hoare annotation is: (= main_~k~0 4) [2020-08-18 17:13:13,532 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-08-18 17:13:13,532 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-08-18 17:13:13,532 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-08-18 17:13:13,532 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-08-18 17:13:13,532 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-08-18 17:13:13,532 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-08-18 17:13:13,551 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 05:13:13 BoogieIcfgContainer [2020-08-18 17:13:13,551 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 17:13:13,554 INFO L168 Benchmark]: Toolchain (without parser) took 16038.98 ms. Allocated memory was 147.3 MB in the beginning and 354.4 MB in the end (delta: 207.1 MB). Free memory was 103.3 MB in the beginning and 165.3 MB in the end (delta: -62.1 MB). Peak memory consumption was 145.0 MB. Max. memory is 7.1 GB. [2020-08-18 17:13:13,555 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 147.3 MB. Free memory was 121.9 MB in the beginning and 121.6 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-08-18 17:13:13,555 INFO L168 Benchmark]: CACSL2BoogieTranslator took 331.67 ms. Allocated memory is still 147.3 MB. Free memory was 103.0 MB in the beginning and 93.6 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-08-18 17:13:13,556 INFO L168 Benchmark]: Boogie Preprocessor took 111.10 ms. Allocated memory was 147.3 MB in the beginning and 203.4 MB in the end (delta: 56.1 MB). Free memory was 93.6 MB in the beginning and 181.5 MB in the end (delta: -87.9 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. [2020-08-18 17:13:13,556 INFO L168 Benchmark]: RCFGBuilder took 263.19 ms. Allocated memory is still 203.4 MB. Free memory was 181.5 MB in the beginning and 169.5 MB in the end (delta: 12.0 MB). Peak memory consumption was 12.0 MB. Max. memory is 7.1 GB. [2020-08-18 17:13:13,557 INFO L168 Benchmark]: TraceAbstraction took 15326.63 ms. Allocated memory was 203.4 MB in the beginning and 354.4 MB in the end (delta: 151.0 MB). Free memory was 168.9 MB in the beginning and 165.3 MB in the end (delta: 3.5 MB). Peak memory consumption was 154.5 MB. Max. memory is 7.1 GB. [2020-08-18 17:13:13,560 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 147.3 MB. Free memory was 121.9 MB in the beginning and 121.6 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 331.67 ms. Allocated memory is still 147.3 MB. Free memory was 103.0 MB in the beginning and 93.6 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 111.10 ms. Allocated memory was 147.3 MB in the beginning and 203.4 MB in the end (delta: 56.1 MB). Free memory was 93.6 MB in the beginning and 181.5 MB in the end (delta: -87.9 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 263.19 ms. Allocated memory is still 203.4 MB. Free memory was 181.5 MB in the beginning and 169.5 MB in the end (delta: 12.0 MB). Peak memory consumption was 12.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 15326.63 ms. Allocated memory was 203.4 MB in the beginning and 354.4 MB in the end (delta: 151.0 MB). Free memory was 168.9 MB in the beginning and 165.3 MB in the end (delta: 3.5 MB). Peak memory consumption was 154.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: k == 4 - InvariantResult [Line: 20]: Loop Invariant Derived loop invariant: k == 4 || i <= 1 - InvariantResult [Line: 18]: Loop Invariant Derived loop invariant: k == 4 || (i <= 0 && j + 100 <= 0) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 15.0s, OverallIterations: 28, TraceHistogramMax: 22, AutomataDifference: 10.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 404 SDtfs, 15 SDslu, 3185 SDs, 0 SdLazy, 1131 SolverSat, 487 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 652 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 540 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2002 ImplicationChecksByTransitivity, 11.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49occurred in iteration=27, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 28 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 37 PreInvPairs, 73 NumberOfFragments, 31 HoareAnnotationTreeSize, 37 FomulaSimplifications, 3216 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 9 FomulaSimplificationsInter, 271 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 3.8s InterpolantComputationTime, 871 NumberOfCodeBlocks, 871 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 843 ConstructedInterpolants, 0 QuantifiedInterpolants, 100903 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 28 InterpolantComputations, 4 PerfectInterpolantSequences, 1512/3323 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 correct! Received shutdown request...