/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=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.8 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 02:05:47,199 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-19 02:05:47,225 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 02:05:47,226 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 02:05:47,227 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 02:05:47,229 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 02:05:47,230 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 02:05:47,231 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 02:05:47,232 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 02:05:47,233 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 02:05:47,233 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 02:05:47,234 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 02:05:47,235 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 02:05:47,236 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 02:05:47,237 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 02:05:47,238 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 02:05:47,240 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 02:05:47,241 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 02:05:47,243 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 02:05:47,244 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 02:05:47,245 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 02:05:47,246 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 02:05:47,249 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 02:05:47,256 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 02:05:47,257 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 02:05:47,258 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 02:05:47,258 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 [2020-08-19 02:05:47,298 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 02:05:47,298 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 02:05:47,302 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 02:05:47,303 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 02:05:47,303 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 02:05:47,303 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 02:05:47,303 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 02:05:47,303 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 02:05:47,304 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 02:05:47,304 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 02:05:47,304 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 02:05:47,304 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 02:05:47,304 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 02:05:47,304 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 02:05:47,305 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 02:05:47,305 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 02:05:47,305 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 02:05:47,305 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 02:05:47,305 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 02:05:47,306 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 02:05:47,306 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 02:05:47,306 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 02:05:47,306 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 02:05:47,306 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 02:05:47,307 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 02:05:47,307 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 02:05:47,307 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 02:05:47,307 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 02:05:47,307 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 02:05:47,307 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=WIDESTAMONGSMALL;tolerance=0.8; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8; [2020-08-19 02:05:47,627 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 02:05:47,638 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 02:05:47,641 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 02:05:47,643 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 02:05:47,643 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 02:05:47,644 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-19 02:05:47,714 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bc0333d74/787996de50b74366930eae750248b7fd/FLAGdda4a3f5d [2020-08-19 02:05:48,167 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 02:05:48,168 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-19 02:05:48,176 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bc0333d74/787996de50b74366930eae750248b7fd/FLAGdda4a3f5d [2020-08-19 02:05:48,569 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bc0333d74/787996de50b74366930eae750248b7fd [2020-08-19 02:05:48,580 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 02:05:48,582 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 02:05:48,583 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 02:05:48,584 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 02:05:48,587 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 02:05:48,588 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:05:48" (1/1) ... [2020-08-19 02:05:48,591 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@770ea115 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:48, skipping insertion in model container [2020-08-19 02:05:48,591 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:05:48" (1/1) ... [2020-08-19 02:05:48,599 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 02:05:48,617 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 02:05:48,783 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:05:48,787 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 02:05:48,805 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:05:48,817 INFO L208 MainTranslator]: Completed translation [2020-08-19 02:05:48,817 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:48 WrapperNode [2020-08-19 02:05:48,817 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 02:05:48,818 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 02:05:48,818 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 02:05:48,818 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 02:05:48,829 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:48" (1/1) ... [2020-08-19 02:05:48,829 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:48" (1/1) ... [2020-08-19 02:05:48,918 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:48" (1/1) ... [2020-08-19 02:05:48,918 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:48" (1/1) ... [2020-08-19 02:05:48,923 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:48" (1/1) ... [2020-08-19 02:05:48,928 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:48" (1/1) ... [2020-08-19 02:05:48,929 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:48" (1/1) ... [2020-08-19 02:05:48,931 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 02:05:48,931 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 02:05:48,931 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 02:05:48,932 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 02:05:48,933 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:48" (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 [2020-08-19 02:05:48,993 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 02:05:48,993 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 02:05:48,993 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-19 02:05:48,994 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 02:05:48,994 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 02:05:48,995 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 02:05:48,995 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-19 02:05:48,995 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-19 02:05:48,995 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 02:05:48,995 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-19 02:05:48,996 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 02:05:48,996 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 02:05:48,996 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 02:05:49,279 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 02:05:49,280 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-19 02:05:49,284 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:05:49 BoogieIcfgContainer [2020-08-19 02:05:49,285 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 02:05:49,297 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 02:05:49,297 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 02:05:49,300 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 02:05:49,301 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 02:05:48" (1/3) ... [2020-08-19 02:05:49,302 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b5ddd51 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:05:49, skipping insertion in model container [2020-08-19 02:05:49,302 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:05:48" (2/3) ... [2020-08-19 02:05:49,302 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b5ddd51 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:05:49, skipping insertion in model container [2020-08-19 02:05:49,303 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:05:49" (3/3) ... [2020-08-19 02:05:49,304 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-19 02:05:49,315 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 02:05:49,324 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 02:05:49,339 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 02:05:49,360 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 02:05:49,360 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 02:05:49,360 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 02:05:49,360 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 02:05:49,361 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 02:05:49,361 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 02:05:49,361 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 02:05:49,361 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 02:05:49,377 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-19 02:05:49,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 02:05:49,383 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:49,384 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:49,384 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:49,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:49,389 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-19 02:05:49,397 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:49,398 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1353626454] [2020-08-19 02:05:49,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:49,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:49,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:49,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:49,507 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:49,508 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1353626454] [2020-08-19 02:05:49,509 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:05:49,510 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-19 02:05:49,510 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793612918] [2020-08-19 02:05:49,516 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-19 02:05:49,516 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:49,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-19 02:05:49,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-19 02:05:49,534 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-19 02:05:49,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:49,559 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-19 02:05:49,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-19 02:05:49,560 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-19 02:05:49,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:49,570 INFO L225 Difference]: With dead ends: 35 [2020-08-19 02:05:49,571 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 02:05:49,575 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 [2020-08-19 02:05:49,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 02:05:49,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 02:05:49,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 02:05:49,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-19 02:05:49,611 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-19 02:05:49,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:49,611 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-19 02:05:49,611 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-19 02:05:49,612 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-19 02:05:49,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 02:05:49,612 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:49,612 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:49,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 02:05:49,613 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:49,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:49,614 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-19 02:05:49,614 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:49,614 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [576150110] [2020-08-19 02:05:49,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:49,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:49,663 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:49,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:49,669 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:49,670 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [576150110] [2020-08-19 02:05:49,671 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:05:49,671 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 02:05:49,672 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049446508] [2020-08-19 02:05:49,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 02:05:49,675 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:49,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 02:05:49,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 02:05:49,676 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-19 02:05:49,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:49,706 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-19 02:05:49,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 02:05:49,707 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-19 02:05:49,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:49,709 INFO L225 Difference]: With dead ends: 24 [2020-08-19 02:05:49,709 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 02:05:49,710 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 [2020-08-19 02:05:49,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 02:05:49,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 02:05:49,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 02:05:49,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-19 02:05:49,716 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-19 02:05:49,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:49,716 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-19 02:05:49,717 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 02:05:49,717 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-19 02:05:49,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 02:05:49,719 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:49,720 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:49,720 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 02:05:49,720 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:49,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:49,721 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-19 02:05:49,721 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:49,722 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2086325165] [2020-08-19 02:05:49,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:49,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:49,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:49,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:49,994 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:49,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2086325165] [2020-08-19 02:05:49,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:05:49,995 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 02:05:49,995 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402502483] [2020-08-19 02:05:49,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 02:05:49,996 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:49,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 02:05:49,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 02:05:49,997 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-19 02:05:50,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:50,052 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-19 02:05:50,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 02:05:50,053 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-19 02:05:50,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:50,054 INFO L225 Difference]: With dead ends: 23 [2020-08-19 02:05:50,054 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 02:05:50,055 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-19 02:05:50,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 02:05:50,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 02:05:50,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 02:05:50,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-19 02:05:50,060 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-19 02:05:50,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:50,060 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-19 02:05:50,061 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 02:05:50,061 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-19 02:05:50,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 02:05:50,061 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:50,062 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:50,062 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 02:05:50,062 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:50,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:50,063 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-19 02:05:50,063 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:50,064 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [414944314] [2020-08-19 02:05:50,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:50,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:50,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:50,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:50,252 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:50,255 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [414944314] [2020-08-19 02:05:50,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:05:50,255 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 02:05:50,256 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390356596] [2020-08-19 02:05:50,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 02:05:50,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:50,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 02:05:50,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 02:05:50,257 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-19 02:05:50,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:50,299 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-19 02:05:50,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 02:05:50,300 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-19 02:05:50,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:50,301 INFO L225 Difference]: With dead ends: 26 [2020-08-19 02:05:50,301 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 02:05:50,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 02:05:50,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 02:05:50,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 02:05:50,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 02:05:50,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-19 02:05:50,313 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-19 02:05:50,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:50,314 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-19 02:05:50,315 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 02:05:50,315 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-19 02:05:50,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 02:05:50,316 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:50,316 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:50,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 02:05:50,316 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:50,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:50,318 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-19 02:05:50,318 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:50,318 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [605798198] [2020-08-19 02:05:50,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:50,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:50,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:50,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:50,598 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:50,598 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [605798198] [2020-08-19 02:05:50,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:50,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 02:05:50,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618977781] [2020-08-19 02:05:50,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 02:05:50,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:50,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 02:05:50,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-19 02:05:50,603 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-19 02:05:50,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:50,734 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-19 02:05:50,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 02:05:50,735 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-19 02:05:50,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:50,736 INFO L225 Difference]: With dead ends: 26 [2020-08-19 02:05:50,737 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 02:05:50,737 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-19 02:05:50,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 02:05:50,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-19 02:05:50,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 02:05:50,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-19 02:05:50,745 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-19 02:05:50,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:50,745 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-19 02:05:50,745 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 02:05:50,746 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-19 02:05:50,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 02:05:50,747 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:50,747 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:50,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 02:05:50,748 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:50,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:50,748 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-19 02:05:50,749 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:50,749 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1883588371] [2020-08-19 02:05:50,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:50,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:51,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:51,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:51,015 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:51,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1883588371] [2020-08-19 02:05:51,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:51,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 02:05:51,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278879554] [2020-08-19 02:05:51,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 02:05:51,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:51,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 02:05:51,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-19 02:05:51,018 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-19 02:05:51,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:51,151 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-19 02:05:51,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 02:05:51,152 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-19 02:05:51,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:51,153 INFO L225 Difference]: With dead ends: 29 [2020-08-19 02:05:51,153 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 02:05:51,154 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-19 02:05:51,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 02:05:51,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-19 02:05:51,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-19 02:05:51,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-19 02:05:51,158 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-19 02:05:51,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:51,159 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-19 02:05:51,159 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 02:05:51,159 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-19 02:05:51,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 02:05:51,160 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:51,160 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:51,160 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 02:05:51,160 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:51,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:51,161 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-19 02:05:51,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:51,161 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1934189373] [2020-08-19 02:05:51,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:51,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:51,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:51,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:51,421 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:51,421 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1934189373] [2020-08-19 02:05:51,421 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:51,422 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 02:05:51,422 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244394271] [2020-08-19 02:05:51,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 02:05:51,423 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:51,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 02:05:51,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-19 02:05:51,423 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-19 02:05:57,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:57,875 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-19 02:05:57,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 02:05:57,875 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-19 02:05:57,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:57,877 INFO L225 Difference]: With dead ends: 32 [2020-08-19 02:05:57,878 INFO L226 Difference]: Without dead ends: 26 [2020-08-19 02:05:57,879 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=33, Invalid=147, Unknown=2, NotChecked=0, Total=182 [2020-08-19 02:05:57,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-19 02:05:57,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-19 02:05:57,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-19 02:05:57,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-19 02:05:57,890 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-19 02:05:57,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:57,891 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-19 02:05:57,891 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 02:05:57,891 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-19 02:05:57,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-19 02:05:57,893 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:57,893 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:57,894 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 02:05:57,894 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:57,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:57,895 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-19 02:05:57,895 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:57,896 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2050350041] [2020-08-19 02:05:57,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:57,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:58,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:58,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:58,331 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:58,331 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2050350041] [2020-08-19 02:05:58,331 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:58,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 02:05:58,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284219918] [2020-08-19 02:05:58,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 02:05:58,332 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:58,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 02:05:58,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-19 02:05:58,333 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-19 02:05:58,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:58,594 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-19 02:05:58,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 02:05:58,595 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-19 02:05:58,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:58,596 INFO L225 Difference]: With dead ends: 35 [2020-08-19 02:05:58,596 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 02:05:58,597 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2020-08-19 02:05:58,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 02:05:58,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-19 02:05:58,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 02:05:58,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-19 02:05:58,602 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-19 02:05:58,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:58,602 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-19 02:05:58,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 02:05:58,603 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-19 02:05:58,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 02:05:58,603 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:58,604 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:58,604 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 02:05:58,604 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:58,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:58,605 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-19 02:05:58,605 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:58,605 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1094786935] [2020-08-19 02:05:58,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:58,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:58,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:58,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:58,971 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:58,971 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1094786935] [2020-08-19 02:05:58,971 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:58,971 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 02:05:58,972 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976132724] [2020-08-19 02:05:58,972 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 02:05:58,972 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:58,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 02:05:58,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-19 02:05:58,973 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-19 02:06:01,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:06:01,305 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-19 02:06:01,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 02:06:01,305 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-19 02:06:01,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:06:01,306 INFO L225 Difference]: With dead ends: 38 [2020-08-19 02:06:01,306 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 02:06:01,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=41, Invalid=265, Unknown=0, NotChecked=0, Total=306 [2020-08-19 02:06:01,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 02:06:01,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-19 02:06:01,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-19 02:06:01,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-19 02:06:01,311 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-19 02:06:01,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:06:01,311 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-19 02:06:01,312 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 02:06:01,312 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-19 02:06:01,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-19 02:06:01,312 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:06:01,313 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:06:01,313 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 02:06:01,313 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:06:01,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:06:01,313 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-19 02:06:01,313 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:06:01,313 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [450854209] [2020-08-19 02:06:01,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:06:01,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:01,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:06:01,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:01,816 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:06:01,816 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [450854209] [2020-08-19 02:06:01,816 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:06:01,817 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 02:06:01,817 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567088979] [2020-08-19 02:06:01,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 02:06:01,818 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:06:01,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 02:06:01,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-19 02:06:01,820 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-19 02:06:03,976 WARN L193 SmtUtils]: Spent 2.11 s on a formula simplification that was a NOOP. DAG size: 22 [2020-08-19 02:06:08,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:06:08,469 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-19 02:06:08,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 02:06:08,470 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-19 02:06:08,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:06:08,472 INFO L225 Difference]: With dead ends: 41 [2020-08-19 02:06:08,472 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 02:06:08,472 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=45, Invalid=334, Unknown=1, NotChecked=0, Total=380 [2020-08-19 02:06:08,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 02:06:08,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-19 02:06:08,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 02:06:08,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-19 02:06:08,477 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-19 02:06:08,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:06:08,477 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-19 02:06:08,478 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 02:06:08,478 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-19 02:06:08,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 02:06:08,485 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:06:08,486 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:06:08,486 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 02:06:08,486 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:06:08,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:06:08,487 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-19 02:06:08,487 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:06:08,487 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1176295264] [2020-08-19 02:06:08,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:06:08,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:09,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:06:09,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:09,023 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:06:09,023 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1176295264] [2020-08-19 02:06:09,024 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:06:09,024 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 02:06:09,024 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [11512492] [2020-08-19 02:06:09,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 02:06:09,025 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:06:09,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 02:06:09,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-19 02:06:09,026 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-19 02:06:17,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:06:17,745 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-19 02:06:17,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 02:06:17,746 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-19 02:06:17,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:06:17,747 INFO L225 Difference]: With dead ends: 44 [2020-08-19 02:06:17,747 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 02:06:17,748 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=49, Invalid=412, Unknown=1, NotChecked=0, Total=462 [2020-08-19 02:06:17,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 02:06:17,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-19 02:06:17,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-19 02:06:17,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-19 02:06:17,759 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-19 02:06:17,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:06:17,759 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-19 02:06:17,759 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 02:06:17,760 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-19 02:06:17,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 02:06:17,760 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:06:17,762 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:06:17,763 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 02:06:17,763 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:06:17,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:06:17,764 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-19 02:06:17,764 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:06:17,764 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1368396594] [2020-08-19 02:06:17,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:06:17,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:18,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:06:18,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:18,403 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:06:18,404 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1368396594] [2020-08-19 02:06:18,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:06:18,404 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 02:06:18,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083042347] [2020-08-19 02:06:18,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 02:06:18,405 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:06:18,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 02:06:18,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-19 02:06:18,406 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-19 02:06:18,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:06:18,877 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-19 02:06:18,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 02:06:18,877 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-19 02:06:18,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:06:18,878 INFO L225 Difference]: With dead ends: 47 [2020-08-19 02:06:18,878 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 02:06:18,880 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=53, Invalid=499, Unknown=0, NotChecked=0, Total=552 [2020-08-19 02:06:18,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 02:06:18,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-19 02:06:18,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 02:06:18,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-19 02:06:18,884 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-19 02:06:18,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:06:18,885 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-19 02:06:18,885 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 02:06:18,885 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-19 02:06:18,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 02:06:18,886 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:06:18,886 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:06:18,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 02:06:18,887 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:06:18,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:06:18,887 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-19 02:06:18,887 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:06:18,887 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1383202350] [2020-08-19 02:06:18,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:06:18,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:19,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:06:19,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:19,601 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:06:19,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1383202350] [2020-08-19 02:06:19,602 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:06:19,602 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 02:06:19,602 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316333783] [2020-08-19 02:06:19,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 02:06:19,603 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:06:19,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 02:06:19,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-19 02:06:19,604 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-19 02:06:38,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:06:38,845 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-19 02:06:38,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 02:06:38,845 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-19 02:06:38,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:06:38,846 INFO L225 Difference]: With dead ends: 50 [2020-08-19 02:06:38,847 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 02:06:38,848 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=57, Invalid=587, Unknown=6, NotChecked=0, Total=650 [2020-08-19 02:06:38,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 02:06:38,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-19 02:06:38,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 02:06:38,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-19 02:06:38,854 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-19 02:06:38,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:06:38,854 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-19 02:06:38,855 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 02:06:38,855 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-19 02:06:38,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 02:06:38,856 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:06:38,856 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:06:38,856 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 02:06:38,856 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:06:38,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:06:38,857 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-19 02:06:38,857 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:06:38,857 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [861889336] [2020-08-19 02:06:38,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:06:38,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:39,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:06:39,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:39,646 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:06:39,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [861889336] [2020-08-19 02:06:39,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:06:39,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 02:06:39,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678240917] [2020-08-19 02:06:39,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 02:06:39,648 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:06:39,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 02:06:39,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-19 02:06:39,649 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states. [2020-08-19 02:06:54,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:06:54,939 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-19 02:06:54,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 02:06:54,940 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 43 [2020-08-19 02:06:54,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:06:54,941 INFO L225 Difference]: With dead ends: 53 [2020-08-19 02:06:54,941 INFO L226 Difference]: Without dead ends: 47 [2020-08-19 02:06:54,943 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=61, Invalid=691, Unknown=4, NotChecked=0, Total=756 [2020-08-19 02:06:54,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-19 02:06:54,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-19 02:06:54,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-19 02:06:54,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-19 02:06:54,948 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2020-08-19 02:06:54,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:06:54,948 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-19 02:06:54,948 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 02:06:54,948 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-19 02:06:54,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 02:06:54,949 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:06:54,949 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:06:54,950 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 02:06:54,950 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:06:54,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:06:54,950 INFO L82 PathProgramCache]: Analyzing trace with hash -1188694230, now seen corresponding path program 11 times [2020-08-19 02:06:54,951 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:06:54,951 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [554512142] [2020-08-19 02:06:54,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:06:54,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:55,890 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:06:55,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:06:55,904 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:06:55,905 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [554512142] [2020-08-19 02:06:55,905 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:06:55,905 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 02:06:55,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023374044] [2020-08-19 02:06:55,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 02:06:55,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:06:55,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 02:06:55,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-19 02:06:55,906 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 27 states.