/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=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.1 -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 [2020-08-19 03:35:44,802 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 03:35:44,805 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 03:35:44,848 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 03:35:44,848 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 03:35:44,859 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 03:35:44,860 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 03:35:44,863 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 03:35:44,867 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 03:35:44,868 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 03:35:44,870 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 03:35:44,871 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 03:35:44,872 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 03:35:44,875 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 03:35:44,877 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 03:35:44,878 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 03:35:44,879 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 03:35:44,880 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 03:35:44,882 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 03:35:44,887 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 03:35:44,892 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 03:35:44,893 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 03:35:44,895 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 03:35:44,896 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 03:35:44,902 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-19 03:35:44,902 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-19 03:35:44,902 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-19 03:35:44,905 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-19 03:35:44,906 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-19 03:35:44,906 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-19 03:35:44,907 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-19 03:35:44,908 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-19 03:35:44,909 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-19 03:35:44,910 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-19 03:35:44,911 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-19 03:35:44,911 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-19 03:35:44,912 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-19 03:35:44,912 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-19 03:35:44,912 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 03:35:44,913 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 03:35:44,914 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 03:35:44,915 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 03:35:44,960 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 03:35:44,960 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 03:35:44,962 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 03:35:44,962 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 03:35:44,962 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 03:35:44,962 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 03:35:44,962 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 03:35:44,963 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 03:35:44,963 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 03:35:44,963 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 03:35:44,964 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 03:35:44,964 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 03:35:44,964 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 03:35:44,965 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 03:35:44,965 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 03:35:44,965 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 03:35:44,965 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 03:35:44,966 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 03:35:44,966 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 03:35:44,966 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 03:35:44,966 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 03:35:44,966 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 03:35:44,967 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 03:35:44,967 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 03:35:44,967 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 03:35:44,967 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 03:35:44,967 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 03:35:44,968 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 03:35:44,968 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 03:35:44,968 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=SMALLESTAMONGWIDE;tolerance=0.1; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1; [2020-08-19 03:35:45,231 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 03:35:45,243 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 03:35:45,247 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 03:35:45,248 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 03:35:45,249 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 03:35:45,249 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-19 03:35:45,322 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/fba3c541e/b007288f09584fe5a0ec39a6e19b2dde/FLAGade37301b [2020-08-19 03:35:45,795 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 03:35:45,796 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-19 03:35:45,805 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/fba3c541e/b007288f09584fe5a0ec39a6e19b2dde/FLAGade37301b [2020-08-19 03:35:46,157 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/fba3c541e/b007288f09584fe5a0ec39a6e19b2dde [2020-08-19 03:35:46,169 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 03:35:46,171 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 03:35:46,173 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 03:35:46,173 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 03:35:46,177 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 03:35:46,178 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 03:35:46" (1/1) ... [2020-08-19 03:35:46,182 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5253b80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:35:46, skipping insertion in model container [2020-08-19 03:35:46,182 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 03:35:46" (1/1) ... [2020-08-19 03:35:46,192 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 03:35:46,215 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 03:35:46,445 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 03:35:46,453 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 03:35:46,473 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 03:35:46,489 INFO L208 MainTranslator]: Completed translation [2020-08-19 03:35:46,489 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:35:46 WrapperNode [2020-08-19 03:35:46,489 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 03:35:46,490 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 03:35:46,490 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 03:35:46,490 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 03:35:46,583 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:35:46" (1/1) ... [2020-08-19 03:35:46,583 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:35:46" (1/1) ... [2020-08-19 03:35:46,592 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:35:46" (1/1) ... [2020-08-19 03:35:46,592 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:35:46" (1/1) ... [2020-08-19 03:35:46,602 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:35:46" (1/1) ... [2020-08-19 03:35:46,608 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:35:46" (1/1) ... [2020-08-19 03:35:46,610 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:35:46" (1/1) ... [2020-08-19 03:35:46,611 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 03:35:46,613 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 03:35:46,613 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 03:35:46,613 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 03:35:46,614 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:35:46" (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 03:35:46,671 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 03:35:46,671 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 03:35:46,671 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-19 03:35:46,671 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 03:35:46,672 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 03:35:46,672 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-19 03:35:46,672 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-19 03:35:46,672 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-19 03:35:46,672 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-19 03:35:46,672 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 03:35:46,673 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-19 03:35:46,673 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-19 03:35:46,673 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-19 03:35:46,673 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-19 03:35:46,673 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 03:35:46,673 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 03:35:46,979 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 03:35:46,979 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-19 03:35:46,984 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 03:35:46 BoogieIcfgContainer [2020-08-19 03:35:46,984 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 03:35:46,986 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 03:35:46,986 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 03:35:46,989 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 03:35:46,989 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 03:35:46" (1/3) ... [2020-08-19 03:35:46,990 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2475c05e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 03:35:46, skipping insertion in model container [2020-08-19 03:35:46,990 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:35:46" (2/3) ... [2020-08-19 03:35:46,990 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2475c05e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 03:35:46, skipping insertion in model container [2020-08-19 03:35:46,991 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 03:35:46" (3/3) ... [2020-08-19 03:35:46,992 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2020-08-19 03:35:47,003 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 03:35:47,012 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 03:35:47,027 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 03:35:47,052 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 03:35:47,052 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 03:35:47,052 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 03:35:47,053 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 03:35:47,053 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 03:35:47,053 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 03:35:47,053 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 03:35:47,053 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 03:35:47,072 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-19 03:35:47,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-19 03:35:47,078 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:35:47,079 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:35:47,080 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:35:47,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:35:47,087 INFO L82 PathProgramCache]: Analyzing trace with hash -899836778, now seen corresponding path program 1 times [2020-08-19 03:35:47,097 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:35:47,097 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1450519162] [2020-08-19 03:35:47,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:35:47,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:47,266 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:35:47,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:47,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-19 03:35:47,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:47,292 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 03:35:47,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1450519162] [2020-08-19 03:35:47,295 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 03:35:47,295 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 03:35:47,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069206065] [2020-08-19 03:35:47,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 03:35:47,302 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:35:47,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 03:35:47,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 03:35:47,323 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-19 03:35:47,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:35:47,424 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-08-19 03:35:47,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 03:35:47,426 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-19 03:35:47,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:35:47,445 INFO L225 Difference]: With dead ends: 42 [2020-08-19 03:35:47,447 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 03:35:47,451 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 [2020-08-19 03:35:47,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 03:35:47,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-19 03:35:47,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 03:35:47,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-19 03:35:47,487 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-19 03:35:47,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:35:47,488 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-19 03:35:47,488 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 03:35:47,488 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-19 03:35:47,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-19 03:35:47,489 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:35:47,489 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:35:47,490 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 03:35:47,490 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:35:47,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:35:47,491 INFO L82 PathProgramCache]: Analyzing trace with hash -1137678901, now seen corresponding path program 1 times [2020-08-19 03:35:47,491 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:35:47,492 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1070748929] [2020-08-19 03:35:47,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:35:47,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:47,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:35:47,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:47,619 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-19 03:35:47,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:47,633 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 03:35:47,634 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1070748929] [2020-08-19 03:35:47,634 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 03:35:47,634 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 03:35:47,637 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603678446] [2020-08-19 03:35:47,638 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 03:35:47,639 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:35:47,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 03:35:47,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 03:35:47,641 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-19 03:35:47,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:35:47,715 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-19 03:35:47,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 03:35:47,716 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-19 03:35:47,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:35:47,717 INFO L225 Difference]: With dead ends: 34 [2020-08-19 03:35:47,717 INFO L226 Difference]: Without dead ends: 22 [2020-08-19 03:35:47,718 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 [2020-08-19 03:35:47,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-19 03:35:47,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-19 03:35:47,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 03:35:47,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-19 03:35:47,726 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-19 03:35:47,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:35:47,726 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-19 03:35:47,727 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 03:35:47,727 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-19 03:35:47,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 03:35:47,728 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:35:47,728 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] [2020-08-19 03:35:47,728 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 03:35:47,729 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:35:47,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:35:47,729 INFO L82 PathProgramCache]: Analyzing trace with hash 278779309, now seen corresponding path program 1 times [2020-08-19 03:35:47,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:35:47,730 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [544864700] [2020-08-19 03:35:47,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:35:47,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:47,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:35:47,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:47,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-19 03:35:47,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:47,808 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:35:47,808 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [544864700] [2020-08-19 03:35:47,809 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:35:47,809 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 03:35:47,809 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401066098] [2020-08-19 03:35:47,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 03:35:47,810 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:35:47,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 03:35:47,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-19 03:35:47,811 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-19 03:35:47,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:35:47,879 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-19 03:35:47,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 03:35:47,880 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-19 03:35:47,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:35:47,881 INFO L225 Difference]: With dead ends: 36 [2020-08-19 03:35:47,881 INFO L226 Difference]: Without dead ends: 24 [2020-08-19 03:35:47,882 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 [2020-08-19 03:35:47,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-19 03:35:47,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-19 03:35:47,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-19 03:35:47,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-19 03:35:47,888 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-19 03:35:47,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:35:47,889 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-19 03:35:47,889 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 03:35:47,889 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-19 03:35:47,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 03:35:47,890 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:35:47,891 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] [2020-08-19 03:35:47,891 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 03:35:47,891 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:35:47,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:35:47,892 INFO L82 PathProgramCache]: Analyzing trace with hash -9513713, now seen corresponding path program 2 times [2020-08-19 03:35:47,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:35:47,892 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1525203284] [2020-08-19 03:35:47,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:35:47,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:47,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:35:47,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:47,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-19 03:35:47,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:47,982 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:35:47,982 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1525203284] [2020-08-19 03:35:47,982 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:35:47,982 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 03:35:47,983 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178622901] [2020-08-19 03:35:47,983 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 03:35:47,984 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:35:47,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 03:35:47,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-19 03:35:47,985 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-19 03:35:48,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:35:48,085 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-19 03:35:48,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 03:35:48,086 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-19 03:35:48,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:35:48,087 INFO L225 Difference]: With dead ends: 38 [2020-08-19 03:35:48,087 INFO L226 Difference]: Without dead ends: 26 [2020-08-19 03:35:48,089 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 [2020-08-19 03:35:48,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-19 03:35:48,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-19 03:35:48,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-19 03:35:48,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-19 03:35:48,096 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-19 03:35:48,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:35:48,097 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-19 03:35:48,097 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 03:35:48,097 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-19 03:35:48,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 03:35:48,100 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:35:48,100 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] [2020-08-19 03:35:48,101 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 03:35:48,101 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:35:48,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:35:48,101 INFO L82 PathProgramCache]: Analyzing trace with hash 2113766385, now seen corresponding path program 3 times [2020-08-19 03:35:48,102 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:35:48,102 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [833393828] [2020-08-19 03:35:48,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:35:48,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:48,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:35:48,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:48,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-19 03:35:48,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:48,257 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:35:48,257 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [833393828] [2020-08-19 03:35:48,257 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:35:48,257 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 03:35:48,258 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979604374] [2020-08-19 03:35:48,258 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 03:35:48,259 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:35:48,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 03:35:48,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-19 03:35:48,259 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-19 03:35:48,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:35:48,331 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-19 03:35:48,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 03:35:48,332 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-19 03:35:48,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:35:48,333 INFO L225 Difference]: With dead ends: 40 [2020-08-19 03:35:48,333 INFO L226 Difference]: Without dead ends: 28 [2020-08-19 03:35:48,334 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 [2020-08-19 03:35:48,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-19 03:35:48,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-19 03:35:48,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-19 03:35:48,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-19 03:35:48,340 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-19 03:35:48,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:35:48,341 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-19 03:35:48,341 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 03:35:48,341 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-19 03:35:48,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-19 03:35:48,342 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:35:48,342 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] [2020-08-19 03:35:48,342 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 03:35:48,342 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:35:48,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:35:48,343 INFO L82 PathProgramCache]: Analyzing trace with hash -1818492333, now seen corresponding path program 4 times [2020-08-19 03:35:48,343 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:35:48,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1101796607] [2020-08-19 03:35:48,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:35:48,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:48,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:35:48,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:48,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-19 03:35:48,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:48,516 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:35:48,516 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1101796607] [2020-08-19 03:35:48,517 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:35:48,518 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 03:35:48,518 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137387817] [2020-08-19 03:35:48,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 03:35:48,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:35:48,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 03:35:48,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-19 03:35:48,528 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-19 03:35:48,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:35:48,609 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-19 03:35:48,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 03:35:48,610 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-19 03:35:48,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:35:48,610 INFO L225 Difference]: With dead ends: 42 [2020-08-19 03:35:48,611 INFO L226 Difference]: Without dead ends: 30 [2020-08-19 03:35:48,611 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 [2020-08-19 03:35:48,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-19 03:35:48,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-19 03:35:48,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 03:35:48,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-19 03:35:48,617 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-19 03:35:48,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:35:48,617 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-19 03:35:48,617 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 03:35:48,617 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-19 03:35:48,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 03:35:48,618 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:35:48,618 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] [2020-08-19 03:35:48,618 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 03:35:48,618 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:35:48,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:35:48,619 INFO L82 PathProgramCache]: Analyzing trace with hash -1147899851, now seen corresponding path program 5 times [2020-08-19 03:35:48,619 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:35:48,619 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1347681612] [2020-08-19 03:35:48,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:35:48,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:48,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:35:48,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:48,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-19 03:35:48,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:48,777 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:35:48,777 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1347681612] [2020-08-19 03:35:48,778 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:35:48,778 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 03:35:48,778 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068788058] [2020-08-19 03:35:48,780 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 03:35:48,780 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:35:48,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 03:35:48,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-19 03:35:48,781 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-19 03:35:48,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:35:48,886 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-19 03:35:48,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 03:35:48,887 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-19 03:35:48,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:35:48,888 INFO L225 Difference]: With dead ends: 44 [2020-08-19 03:35:48,888 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 03:35:48,889 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 [2020-08-19 03:35:48,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 03:35:48,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-19 03:35:48,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 03:35:48,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-19 03:35:48,898 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-19 03:35:48,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:35:48,899 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-19 03:35:48,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 03:35:48,899 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-19 03:35:48,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-19 03:35:48,902 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:35:48,903 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] [2020-08-19 03:35:48,903 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 03:35:48,903 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:35:48,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:35:48,904 INFO L82 PathProgramCache]: Analyzing trace with hash -953619049, now seen corresponding path program 6 times [2020-08-19 03:35:48,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:35:48,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1852298091] [2020-08-19 03:35:48,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:35:48,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:49,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:35:49,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:49,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-19 03:35:49,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:49,060 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:35:49,060 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1852298091] [2020-08-19 03:35:49,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:35:49,061 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 03:35:49,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090251807] [2020-08-19 03:35:49,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 03:35:49,062 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:35:49,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 03:35:49,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-19 03:35:49,062 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-19 03:35:49,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:35:49,180 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-19 03:35:49,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 03:35:49,181 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-19 03:35:49,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:35:49,182 INFO L225 Difference]: With dead ends: 46 [2020-08-19 03:35:49,182 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 03:35:49,183 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 [2020-08-19 03:35:49,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 03:35:49,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-19 03:35:49,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 03:35:49,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-19 03:35:49,193 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-19 03:35:49,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:35:49,194 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-19 03:35:49,194 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 03:35:49,194 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-19 03:35:49,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 03:35:49,197 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:35:49,198 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] [2020-08-19 03:35:49,198 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 03:35:49,198 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:35:49,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:35:49,199 INFO L82 PathProgramCache]: Analyzing trace with hash 1066637945, now seen corresponding path program 7 times [2020-08-19 03:35:49,199 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:35:49,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1275937408] [2020-08-19 03:35:49,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:35:49,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:49,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:35:49,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:49,363 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-19 03:35:49,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:49,370 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:35:49,370 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1275937408] [2020-08-19 03:35:49,370 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:35:49,371 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 03:35:49,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499680832] [2020-08-19 03:35:49,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 03:35:49,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:35:49,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 03:35:49,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-19 03:35:49,377 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-19 03:35:49,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:35:49,481 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-19 03:35:49,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 03:35:49,481 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-19 03:35:49,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:35:49,482 INFO L225 Difference]: With dead ends: 48 [2020-08-19 03:35:49,482 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 03:35:49,483 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 [2020-08-19 03:35:49,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 03:35:49,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-19 03:35:49,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 03:35:49,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-19 03:35:49,491 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-19 03:35:49,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:35:49,494 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-19 03:35:49,494 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 03:35:49,494 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-19 03:35:49,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 03:35:49,494 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:35:49,495 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] [2020-08-19 03:35:49,495 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 03:35:49,495 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:35:49,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:35:49,495 INFO L82 PathProgramCache]: Analyzing trace with hash 1208391387, now seen corresponding path program 8 times [2020-08-19 03:35:49,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:35:49,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2069679381] [2020-08-19 03:35:49,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:35:49,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:49,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:35:49,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:49,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-19 03:35:49,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:49,662 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:35:49,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2069679381] [2020-08-19 03:35:49,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:35:49,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 03:35:49,663 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884881241] [2020-08-19 03:35:49,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 03:35:49,664 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:35:49,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 03:35:49,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-19 03:35:49,665 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-19 03:35:49,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:35:49,760 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-19 03:35:49,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 03:35:49,761 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-19 03:35:49,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:35:49,762 INFO L225 Difference]: With dead ends: 50 [2020-08-19 03:35:49,762 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 03:35:49,762 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 [2020-08-19 03:35:49,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 03:35:49,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-19 03:35:49,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 03:35:49,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-19 03:35:49,773 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-19 03:35:49,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:35:49,774 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-19 03:35:49,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 03:35:49,774 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-19 03:35:49,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 03:35:49,775 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:35:49,775 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] [2020-08-19 03:35:49,775 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 03:35:49,775 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:35:49,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:35:49,775 INFO L82 PathProgramCache]: Analyzing trace with hash -5504323, now seen corresponding path program 9 times [2020-08-19 03:35:49,775 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:35:49,777 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [932337053] [2020-08-19 03:35:49,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:35:49,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:49,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:35:49,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:49,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-19 03:35:49,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:35:49,934 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:35:49,934 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [932337053] [2020-08-19 03:35:49,934 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:35:49,935 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 03:35:49,935 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63132577] [2020-08-19 03:35:49,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 03:35:49,937 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:35:49,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 03:35:49,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-19 03:35:49,938 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-19 03:35:50,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:35:50,033 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-08-19 03:35:50,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 03:35:50,035 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-19 03:35:50,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:35:50,036 INFO L225 Difference]: With dead ends: 51 [2020-08-19 03:35:50,036 INFO L226 Difference]: Without dead ends: 39 [2020-08-19 03:35:50,037 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 [2020-08-19 03:35:50,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-19 03:35:50,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-19 03:35:50,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 03:35:50,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-19 03:35:50,045 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-19 03:35:50,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:35:50,045 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-19 03:35:50,045 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 03:35:50,046 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-19 03:35:50,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 03:35:50,046 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:35:50,046 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] [2020-08-19 03:35:50,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 03:35:50,047 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:35:50,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:35:50,047 INFO L82 PathProgramCache]: Analyzing trace with hash 1671822879, now seen corresponding path program 10 times [2020-08-19 03:35:50,047 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:35:50,048 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [48870394] [2020-08-19 03:35:50,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:35:50,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:36:00,060 WARN L193 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 8 [2020-08-19 03:36:01,160 WARN L193 SmtUtils]: Spent 855.00 ms on a formula simplification. DAG size of input: 567 DAG size of output: 11 [2020-08-19 03:36:05,273 WARN L193 SmtUtils]: Spent 3.65 s on a formula simplification. DAG size of input: 1063 DAG size of output: 8 [2020-08-19 03:36:33,002 WARN L193 SmtUtils]: Spent 26.87 s on a formula simplification. DAG size of input: 2458 DAG size of output: 8 [2020-08-19 03:36:33,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:36:33,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:36:33,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-19 03:36:33,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:36:33,393 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-19 03:36:33,393 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [48870394] [2020-08-19 03:36:33,394 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:36:33,394 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 03:36:33,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045167840] [2020-08-19 03:36:33,395 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 03:36:33,395 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:36:33,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 03:36:33,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2020-08-19 03:36:33,396 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 16 states. [2020-08-19 03:36:33,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:36:33,856 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-19 03:36:33,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 03:36:33,857 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-19 03:36:33,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:36:33,858 INFO L225 Difference]: With dead ends: 49 [2020-08-19 03:36:33,858 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 03:36:33,859 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 33.1s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-19 03:36:33,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 03:36:33,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-19 03:36:33,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 03:36:33,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-19 03:36:33,865 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-19 03:36:33,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:36:33,866 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-19 03:36:33,866 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 03:36:33,866 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-19 03:36:33,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 03:36:33,867 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:36:33,867 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] [2020-08-19 03:36:33,867 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 03:36:33,867 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:36:33,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:36:33,868 INFO L82 PathProgramCache]: Analyzing trace with hash 443458522, now seen corresponding path program 1 times [2020-08-19 03:36:33,868 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:36:33,868 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [580790747] [2020-08-19 03:36:33,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:36:34,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:36:38,272 WARN L193 SmtUtils]: Spent 389.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 8 [2020-08-19 03:36:39,535 WARN L193 SmtUtils]: Spent 1.05 s on a formula simplification. DAG size of input: 401 DAG size of output: 8 [2020-08-19 03:36:43,651 WARN L193 SmtUtils]: Spent 3.67 s on a formula simplification. DAG size of input: 830 DAG size of output: 8 [2020-08-19 03:36:44,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:36:44,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:36:44,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-19 03:36:44,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:36:44,228 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 101 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-19 03:36:44,228 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [580790747] [2020-08-19 03:36:44,228 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:36:44,228 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 03:36:44,232 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961252048] [2020-08-19 03:36:44,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 03:36:44,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:36:44,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 03:36:44,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2020-08-19 03:36:44,237 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 21 states. [2020-08-19 03:36:45,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:36:45,197 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-19 03:36:45,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 03:36:45,198 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2020-08-19 03:36:45,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:36:45,200 INFO L225 Difference]: With dead ends: 48 [2020-08-19 03:36:45,200 INFO L226 Difference]: Without dead ends: 43 [2020-08-19 03:36:45,201 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=94, Invalid=718, Unknown=0, NotChecked=0, Total=812 [2020-08-19 03:36:45,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-19 03:36:45,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-19 03:36:45,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 03:36:45,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-19 03:36:45,210 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-19 03:36:45,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:36:45,210 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-19 03:36:45,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 03:36:45,210 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-19 03:36:45,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 03:36:45,211 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:36:45,211 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] [2020-08-19 03:36:45,212 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 03:36:45,212 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:36:45,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:36:45,212 INFO L82 PathProgramCache]: Analyzing trace with hash 1101317845, now seen corresponding path program 2 times [2020-08-19 03:36:45,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:36:45,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1954851121] [2020-08-19 03:36:45,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:36:45,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat