/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 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 11:21:26,133 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 11:21:26,136 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 11:21:26,161 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 11:21:26,162 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 11:21:26,163 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 11:21:26,164 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 11:21:26,166 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 11:21:26,168 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 11:21:26,169 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 11:21:26,170 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 11:21:26,171 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 11:21:26,171 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 11:21:26,172 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 11:21:26,173 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 11:21:26,174 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 11:21:26,175 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 11:21:26,176 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 11:21:26,178 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 11:21:26,180 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 11:21:26,182 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 11:21:26,183 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 11:21:26,184 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 11:21:26,188 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 11:21:26,192 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 11:21:26,208 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 11:21:26,209 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 11:21:26,211 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 11:21:26,212 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 11:21:26,257 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 11:21:26,257 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 11:21:26,259 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 11:21:26,259 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 11:21:26,259 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 11:21:26,260 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 11:21:26,260 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 11:21:26,260 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 11:21:26,261 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 11:21:26,261 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 11:21:26,262 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 11:21:26,262 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 11:21:26,262 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 11:21:26,263 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 11:21:26,263 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 11:21:26,263 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 11:21:26,263 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 11:21:26,264 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 11:21:26,264 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 11:21:26,264 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 11:21:26,265 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 11:21:26,265 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 11:21:26,265 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 11:21:26,265 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 11:21:26,265 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 11:21:26,266 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 11:21:26,266 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 11:21:26,266 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 11:21:26,266 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 11:21:26,266 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 [2020-08-18 11:21:26,623 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 11:21:26,633 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 11:21:26,637 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 11:21:26,638 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 11:21:26,639 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 11:21:26,640 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-18 11:21:26,718 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/322d5084b/a5434a45560b4907b6c74a071baa3153/FLAG7b7b43257 [2020-08-18 11:21:27,200 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 11:21:27,201 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-18 11:21:27,208 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/322d5084b/a5434a45560b4907b6c74a071baa3153/FLAG7b7b43257 [2020-08-18 11:21:27,552 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/322d5084b/a5434a45560b4907b6c74a071baa3153 [2020-08-18 11:21:27,563 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 11:21:27,565 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 11:21:27,566 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 11:21:27,566 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 11:21:27,570 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 11:21:27,571 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 11:21:27" (1/1) ... [2020-08-18 11:21:27,574 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@75e37eeb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:21:27, skipping insertion in model container [2020-08-18 11:21:27,575 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 11:21:27" (1/1) ... [2020-08-18 11:21:27,583 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 11:21:27,602 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 11:21:27,810 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 11:21:27,819 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 11:21:27,841 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 11:21:27,947 INFO L208 MainTranslator]: Completed translation [2020-08-18 11:21:27,947 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:21:27 WrapperNode [2020-08-18 11:21:27,947 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 11:21:27,948 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 11:21:27,948 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 11:21:27,948 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 11:21:27,959 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:21:27" (1/1) ... [2020-08-18 11:21:27,960 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:21:27" (1/1) ... [2020-08-18 11:21:27,968 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:21:27" (1/1) ... [2020-08-18 11:21:27,968 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:21:27" (1/1) ... [2020-08-18 11:21:27,978 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:21:27" (1/1) ... [2020-08-18 11:21:27,983 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:21:27" (1/1) ... [2020-08-18 11:21:27,985 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:21:27" (1/1) ... [2020-08-18 11:21:27,987 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 11:21:27,988 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 11:21:27,988 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 11:21:27,988 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 11:21:27,989 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:21:27" (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 11:21:28,051 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 11:21:28,051 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 11:21:28,051 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-18 11:21:28,051 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 11:21:28,051 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 11:21:28,052 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 11:21:28,052 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-18 11:21:28,052 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 11:21:28,052 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 11:21:28,052 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 11:21:28,052 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 11:21:28,053 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 11:21:28,053 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 11:21:28,053 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 11:21:28,053 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 11:21:28,053 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 11:21:28,383 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 11:21:28,383 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-18 11:21:28,387 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 11:21:28 BoogieIcfgContainer [2020-08-18 11:21:28,387 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 11:21:28,388 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 11:21:28,388 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 11:21:28,391 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 11:21:28,391 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 11:21:27" (1/3) ... [2020-08-18 11:21:28,392 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22185780 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 11:21:28, skipping insertion in model container [2020-08-18 11:21:28,392 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:21:27" (2/3) ... [2020-08-18 11:21:28,392 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22185780 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 11:21:28, skipping insertion in model container [2020-08-18 11:21:28,393 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 11:21:28" (3/3) ... [2020-08-18 11:21:28,394 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2020-08-18 11:21:28,404 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 11:21:28,410 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 11:21:28,423 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 11:21:28,445 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 11:21:28,446 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 11:21:28,446 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 11:21:28,446 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 11:21:28,446 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 11:21:28,446 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 11:21:28,446 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 11:21:28,446 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 11:21:28,462 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-18 11:21:28,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 11:21:28,467 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:21:28,468 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 11:21:28,469 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:21:28,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:21:28,473 INFO L82 PathProgramCache]: Analyzing trace with hash -899836778, now seen corresponding path program 1 times [2020-08-18 11:21:28,480 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:21:28,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1916282402] [2020-08-18 11:21:28,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:21:28,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:28,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:21:28,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:28,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 11:21:28,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:28,673 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 11:21:28,674 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1916282402] [2020-08-18 11:21:28,676 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 11:21:28,676 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 11:21:28,677 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359971962] [2020-08-18 11:21:28,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 11:21:28,685 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:21:28,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 11:21:28,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 11:21:28,698 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-18 11:21:28,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:21:28,803 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-08-18 11:21:28,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 11:21:28,805 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-18 11:21:28,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:21:28,814 INFO L225 Difference]: With dead ends: 42 [2020-08-18 11:21:28,815 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 11:21:28,818 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 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 11:21:28,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 11:21:28,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 11:21:28,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 11:21:28,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-18 11:21:28,852 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-18 11:21:28,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:21:28,853 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-18 11:21:28,853 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 11:21:28,853 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-18 11:21:28,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 11:21:28,854 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:21:28,854 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 11:21:28,855 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 11:21:28,855 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:21:28,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:21:28,855 INFO L82 PathProgramCache]: Analyzing trace with hash -1137678901, now seen corresponding path program 1 times [2020-08-18 11:21:28,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:21:28,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2018842791] [2020-08-18 11:21:28,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:21:28,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:28,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:21:28,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:28,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-18 11:21:28,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:28,951 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 11:21:28,951 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2018842791] [2020-08-18 11:21:28,952 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 11:21:28,952 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 11:21:28,952 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959957570] [2020-08-18 11:21:28,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 11:21:28,954 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:21:28,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 11:21:28,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 11:21:28,955 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-18 11:21:29,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:21:29,015 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-18 11:21:29,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 11:21:29,016 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-18 11:21:29,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:21:29,017 INFO L225 Difference]: With dead ends: 34 [2020-08-18 11:21:29,017 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 11:21:29,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 11:21:29,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 11:21:29,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-18 11:21:29,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 11:21:29,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-18 11:21:29,026 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-18 11:21:29,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:21:29,026 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-18 11:21:29,026 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 11:21:29,027 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-18 11:21:29,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 11:21:29,028 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:21:29,028 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 11:21:29,028 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 11:21:29,028 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:21:29,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:21:29,029 INFO L82 PathProgramCache]: Analyzing trace with hash 278779309, now seen corresponding path program 1 times [2020-08-18 11:21:29,029 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:21:29,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2084110645] [2020-08-18 11:21:29,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:21:29,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:29,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:21:29,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:29,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-18 11:21:29,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:29,141 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 11:21:29,142 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2084110645] [2020-08-18 11:21:29,142 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:21:29,142 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 11:21:29,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211969480] [2020-08-18 11:21:29,143 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 11:21:29,143 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:21:29,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 11:21:29,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 11:21:29,144 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-18 11:21:29,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:21:29,215 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-18 11:21:29,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 11:21:29,215 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-18 11:21:29,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:21:29,216 INFO L225 Difference]: With dead ends: 36 [2020-08-18 11:21:29,217 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 11:21:29,217 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 11:21:29,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 11:21:29,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-18 11:21:29,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 11:21:29,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-18 11:21:29,224 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-18 11:21:29,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:21:29,225 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-18 11:21:29,225 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 11:21:29,225 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-18 11:21:29,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 11:21:29,226 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:21:29,226 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 11:21:29,227 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 11:21:29,227 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:21:29,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:21:29,227 INFO L82 PathProgramCache]: Analyzing trace with hash -9513713, now seen corresponding path program 2 times [2020-08-18 11:21:29,228 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:21:29,228 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1842033267] [2020-08-18 11:21:29,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:21:29,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:29,333 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:21:29,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:29,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-18 11:21:29,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:29,346 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 11:21:29,346 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1842033267] [2020-08-18 11:21:29,347 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:21:29,347 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 11:21:29,347 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133180646] [2020-08-18 11:21:29,348 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 11:21:29,348 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:21:29,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 11:21:29,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 11:21:29,349 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-18 11:21:29,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:21:29,423 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-18 11:21:29,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 11:21:29,424 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-18 11:21:29,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:21:29,425 INFO L225 Difference]: With dead ends: 38 [2020-08-18 11:21:29,426 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 11:21:29,436 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 11:21:29,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 11:21:29,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-18 11:21:29,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 11:21:29,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-18 11:21:29,445 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-18 11:21:29,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:21:29,445 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-18 11:21:29,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 11:21:29,446 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-18 11:21:29,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 11:21:29,447 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:21:29,447 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 11:21:29,447 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 11:21:29,447 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:21:29,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:21:29,448 INFO L82 PathProgramCache]: Analyzing trace with hash 2113766385, now seen corresponding path program 3 times [2020-08-18 11:21:29,448 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:21:29,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [144382220] [2020-08-18 11:21:29,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:21:29,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:29,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:21:29,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:29,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-18 11:21:29,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:29,535 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 11:21:29,536 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [144382220] [2020-08-18 11:21:29,536 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:21:29,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 11:21:29,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273229281] [2020-08-18 11:21:29,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 11:21:29,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:21:29,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 11:21:29,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 11:21:29,538 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-18 11:21:29,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:21:29,610 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-18 11:21:29,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 11:21:29,610 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-18 11:21:29,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:21:29,611 INFO L225 Difference]: With dead ends: 40 [2020-08-18 11:21:29,611 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 11:21:29,612 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 11:21:29,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 11:21:29,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-18 11:21:29,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 11:21:29,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-18 11:21:29,618 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-18 11:21:29,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:21:29,619 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-18 11:21:29,619 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 11:21:29,619 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-18 11:21:29,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 11:21:29,620 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:21:29,620 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 11:21:29,620 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 11:21:29,621 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:21:29,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:21:29,621 INFO L82 PathProgramCache]: Analyzing trace with hash -1818492333, now seen corresponding path program 4 times [2020-08-18 11:21:29,621 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:21:29,622 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1319750382] [2020-08-18 11:21:29,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:21:29,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:29,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:21:29,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:29,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-18 11:21:29,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:29,731 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 11:21:29,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1319750382] [2020-08-18 11:21:29,732 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:21:29,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 11:21:29,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890217937] [2020-08-18 11:21:29,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 11:21:29,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:21:29,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 11:21:29,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 11:21:29,734 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-18 11:21:29,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:21:29,808 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-18 11:21:29,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 11:21:29,809 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-18 11:21:29,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:21:29,810 INFO L225 Difference]: With dead ends: 42 [2020-08-18 11:21:29,810 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 11:21:29,811 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 11:21:29,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 11:21:29,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 11:21:29,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 11:21:29,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-18 11:21:29,817 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-18 11:21:29,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:21:29,817 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-18 11:21:29,817 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 11:21:29,818 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-18 11:21:29,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 11:21:29,819 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:21:29,819 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 11:21:29,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 11:21:29,819 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:21:29,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:21:29,820 INFO L82 PathProgramCache]: Analyzing trace with hash -1147899851, now seen corresponding path program 5 times [2020-08-18 11:21:29,820 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:21:29,821 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [63749058] [2020-08-18 11:21:29,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:21:29,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:29,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:21:29,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:29,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-18 11:21:29,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:29,925 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 11:21:29,926 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [63749058] [2020-08-18 11:21:29,926 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:21:29,926 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 11:21:29,927 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381107352] [2020-08-18 11:21:29,927 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 11:21:29,927 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:21:29,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 11:21:29,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 11:21:29,928 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-18 11:21:30,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:21:30,015 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-18 11:21:30,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 11:21:30,016 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-18 11:21:30,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:21:30,016 INFO L225 Difference]: With dead ends: 44 [2020-08-18 11:21:30,016 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 11:21:30,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 11:21:30,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 11:21:30,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 11:21:30,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 11:21:30,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-18 11:21:30,023 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-18 11:21:30,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:21:30,023 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-18 11:21:30,024 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 11:21:30,024 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-18 11:21:30,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 11:21:30,025 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:21:30,025 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 11:21:30,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 11:21:30,025 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:21:30,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:21:30,026 INFO L82 PathProgramCache]: Analyzing trace with hash -953619049, now seen corresponding path program 6 times [2020-08-18 11:21:30,026 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:21:30,026 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1072092572] [2020-08-18 11:21:30,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:21:30,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:30,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:21:30,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:30,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 11:21:30,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:30,150 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 11:21:30,151 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1072092572] [2020-08-18 11:21:30,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:21:30,151 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 11:21:30,151 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347847246] [2020-08-18 11:21:30,152 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 11:21:30,152 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:21:30,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 11:21:30,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 11:21:30,153 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-18 11:21:30,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:21:30,238 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-18 11:21:30,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 11:21:30,239 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-18 11:21:30,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:21:30,240 INFO L225 Difference]: With dead ends: 46 [2020-08-18 11:21:30,240 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 11:21:30,241 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 11:21:30,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 11:21:30,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 11:21:30,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 11:21:30,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-18 11:21:30,247 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-18 11:21:30,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:21:30,247 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-18 11:21:30,247 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 11:21:30,247 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-18 11:21:30,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 11:21:30,248 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:21:30,249 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 11:21:30,249 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 11:21:30,249 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:21:30,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:21:30,250 INFO L82 PathProgramCache]: Analyzing trace with hash 1066637945, now seen corresponding path program 7 times [2020-08-18 11:21:30,250 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:21:30,250 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [762182457] [2020-08-18 11:21:30,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:21:30,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:30,388 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:21:30,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:30,392 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-18 11:21:30,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:30,402 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 11:21:30,403 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [762182457] [2020-08-18 11:21:30,403 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:21:30,403 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 11:21:30,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801027084] [2020-08-18 11:21:30,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 11:21:30,409 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:21:30,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 11:21:30,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 11:21:30,411 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-18 11:21:30,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:21:30,521 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-18 11:21:30,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 11:21:30,521 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-18 11:21:30,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:21:30,522 INFO L225 Difference]: With dead ends: 48 [2020-08-18 11:21:30,522 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 11:21:30,523 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 11:21:30,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 11:21:30,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 11:21:30,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 11:21:30,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-18 11:21:30,528 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-18 11:21:30,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:21:30,529 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-18 11:21:30,529 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 11:21:30,529 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-18 11:21:30,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 11:21:30,530 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:21:30,530 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 11:21:30,531 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 11:21:30,531 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:21:30,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:21:30,531 INFO L82 PathProgramCache]: Analyzing trace with hash 1208391387, now seen corresponding path program 8 times [2020-08-18 11:21:30,531 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:21:30,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [462831202] [2020-08-18 11:21:30,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:21:30,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:30,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:21:30,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:30,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-18 11:21:30,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:30,692 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 11:21:30,692 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [462831202] [2020-08-18 11:21:30,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:21:30,693 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 11:21:30,693 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858299723] [2020-08-18 11:21:30,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 11:21:30,694 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:21:30,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 11:21:30,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 11:21:30,694 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-18 11:21:30,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:21:30,800 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-18 11:21:30,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 11:21:30,801 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-18 11:21:30,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:21:30,802 INFO L225 Difference]: With dead ends: 50 [2020-08-18 11:21:30,802 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 11:21:30,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 11:21:30,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 11:21:30,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 11:21:30,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 11:21:30,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-18 11:21:30,808 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-18 11:21:30,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:21:30,809 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-18 11:21:30,809 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 11:21:30,809 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-18 11:21:30,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 11:21:30,810 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:21:30,810 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 11:21:30,810 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 11:21:30,810 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:21:30,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:21:30,811 INFO L82 PathProgramCache]: Analyzing trace with hash -5504323, now seen corresponding path program 9 times [2020-08-18 11:21:30,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:21:30,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [347746096] [2020-08-18 11:21:30,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:21:30,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:30,952 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:21:30,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:30,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-18 11:21:30,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:30,961 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 11:21:30,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [347746096] [2020-08-18 11:21:30,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:21:30,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 11:21:30,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411959631] [2020-08-18 11:21:30,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 11:21:30,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:21:30,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 11:21:30,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 11:21:30,964 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-18 11:21:31,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:21:31,058 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-08-18 11:21:31,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 11:21:31,059 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-18 11:21:31,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:21:31,060 INFO L225 Difference]: With dead ends: 51 [2020-08-18 11:21:31,060 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 11:21:31,060 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 11:21:31,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 11:21:31,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 11:21:31,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 11:21:31,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-18 11:21:31,066 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-18 11:21:31,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:21:31,066 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-18 11:21:31,066 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 11:21:31,066 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-18 11:21:31,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 11:21:31,067 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:21:31,067 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 11:21:31,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 11:21:31,068 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:21:31,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:21:31,068 INFO L82 PathProgramCache]: Analyzing trace with hash 1671822879, now seen corresponding path program 10 times [2020-08-18 11:21:31,068 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:21:31,069 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1206723573] [2020-08-18 11:21:31,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:21:31,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:21:40,950 WARN L193 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 8 [2020-08-18 11:21:41,958 WARN L193 SmtUtils]: Spent 790.00 ms on a formula simplification. DAG size of input: 567 DAG size of output: 11 [2020-08-18 11:21:46,139 WARN L193 SmtUtils]: Spent 3.84 s on a formula simplification. DAG size of input: 1063 DAG size of output: 8 [2020-08-18 11:22:14,607 WARN L193 SmtUtils]: Spent 27.25 s on a formula simplification. DAG size of input: 2458 DAG size of output: 8 [2020-08-18 11:22:14,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:22:14,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:22:14,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-18 11:22:14,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:22:14,988 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 11:22:14,989 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1206723573] [2020-08-18 11:22:14,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:22:14,989 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 11:22:14,989 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830152410] [2020-08-18 11:22:14,990 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 11:22:14,992 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:22:14,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 11:22:14,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2020-08-18 11:22:14,993 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 16 states. [2020-08-18 11:22:15,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:22:15,449 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-18 11:22:15,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 11:22:15,450 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-18 11:22:15,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:22:15,451 INFO L225 Difference]: With dead ends: 49 [2020-08-18 11:22:15,451 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 11:22:15,455 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 33.9s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-18 11:22:15,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 11:22:15,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 11:22:15,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 11:22:15,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-18 11:22:15,467 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-18 11:22:15,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:22:15,467 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-18 11:22:15,467 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 11:22:15,467 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-18 11:22:15,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 11:22:15,468 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:22:15,468 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 11:22:15,469 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 11:22:15,469 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:22:15,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:22:15,469 INFO L82 PathProgramCache]: Analyzing trace with hash 443458522, now seen corresponding path program 1 times [2020-08-18 11:22:15,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:22:15,471 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1687462190] [2020-08-18 11:22:15,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:22:15,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:22:19,572 WARN L193 SmtUtils]: Spent 314.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 8 [2020-08-18 11:22:20,741 WARN L193 SmtUtils]: Spent 959.00 ms on a formula simplification. DAG size of input: 401 DAG size of output: 8 [2020-08-18 11:22:24,762 WARN L193 SmtUtils]: Spent 3.70 s on a formula simplification. DAG size of input: 830 DAG size of output: 8 [2020-08-18 11:22:25,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 11:22:25,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:22:25,305 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-18 11:22:25,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 11:22:25,350 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 101 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 11:22:25,350 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1687462190] [2020-08-18 11:22:25,351 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 11:22:25,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 11:22:25,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496462802] [2020-08-18 11:22:25,355 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 11:22:25,355 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 11:22:25,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 11:22:25,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2020-08-18 11:22:25,358 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 21 states. [2020-08-18 11:22:26,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 11:22:26,349 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-18 11:22:26,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 11:22:26,350 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2020-08-18 11:22:26,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 11:22:26,352 INFO L225 Difference]: With dead ends: 48 [2020-08-18 11:22:26,352 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 11:22:26,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=94, Invalid=718, Unknown=0, NotChecked=0, Total=812 [2020-08-18 11:22:26,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 11:22:26,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 11:22:26,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 11:22:26,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-18 11:22:26,362 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-18 11:22:26,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 11:22:26,362 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-18 11:22:26,362 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 11:22:26,362 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-18 11:22:26,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 11:22:26,363 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 11:22:26,363 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 11:22:26,363 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 11:22:26,364 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 11:22:26,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 11:22:26,364 INFO L82 PathProgramCache]: Analyzing trace with hash 1101317845, now seen corresponding path program 2 times [2020-08-18 11:22:26,364 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 11:22:26,364 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1102620168] [2020-08-18 11:22:26,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 11:22:26,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat