/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 --rcfgbuilder.size.of.a.code.block SingleStatement --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options interpolation-heuristic=FIRST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-c90d42b [2020-09-24 16:10:42,925 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-24 16:10:42,930 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-24 16:10:42,972 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-24 16:10:42,973 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-24 16:10:42,974 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-24 16:10:42,976 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-24 16:10:42,978 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-24 16:10:42,980 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-24 16:10:42,981 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-24 16:10:42,982 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-24 16:10:42,984 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-24 16:10:42,984 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-24 16:10:42,985 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-24 16:10:42,986 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-24 16:10:42,988 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-24 16:10:42,989 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-24 16:10:42,990 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-24 16:10:42,992 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-24 16:10:42,994 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-24 16:10:42,996 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-24 16:10:42,997 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-24 16:10:42,999 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-24 16:10:43,000 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-24 16:10:43,003 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-24 16:10:43,003 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-24 16:10:43,003 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-24 16:10:43,004 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-24 16:10:43,005 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-24 16:10:43,006 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-24 16:10:43,006 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-24 16:10:43,007 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-24 16:10:43,008 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-24 16:10:43,009 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-24 16:10:43,011 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-24 16:10:43,011 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-24 16:10:43,012 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-24 16:10:43,012 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-24 16:10:43,012 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-24 16:10:43,013 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-24 16:10:43,014 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-24 16:10:43,015 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 [2020-09-24 16:10:43,044 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-24 16:10:43,045 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-24 16:10:43,048 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-24 16:10:43,048 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-24 16:10:43,049 INFO L138 SettingsManager]: * Use SBE=true [2020-09-24 16:10:43,049 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-24 16:10:43,049 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-24 16:10:43,049 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-24 16:10:43,050 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-24 16:10:43,050 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-24 16:10:43,050 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-24 16:10:43,050 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-24 16:10:43,050 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-24 16:10:43,050 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-24 16:10:43,052 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-24 16:10:43,052 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-24 16:10:43,052 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-24 16:10:43,052 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-24 16:10:43,053 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-24 16:10:43,053 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-24 16:10:43,053 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-24 16:10:43,053 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-24 16:10:43,053 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-24 16:10:43,054 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-24 16:10:43,054 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-24 16:10:43,055 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-24 16:10:43,055 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-24 16:10:43,055 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-24 16:10:43,055 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-24 16:10:43,056 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.rcfgbuilder: Size of a code block -> SingleStatement 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 -> produce-proofs=true;produce-unsat-cores=true;interpolation-heuristic=FIRST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;interpolation-heuristic=FIRST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;interpolation-heuristic=FIRST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;interpolation-heuristic=FIRST;log-additional-information=true; [2020-09-24 16:10:43,550 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-24 16:10:43,579 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-24 16:10:43,583 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-24 16:10:43,586 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-24 16:10:43,587 INFO L275 PluginConnector]: CDTParser initialized [2020-09-24 16:10:43,588 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-09-24 16:10:43,689 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d4189bdfc/6b313c6f9f0c4b77bcddb9c2a15265fe/FLAGa9815d6cf [2020-09-24 16:10:44,282 INFO L306 CDTParser]: Found 1 translation units. [2020-09-24 16:10:44,283 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-09-24 16:10:44,292 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d4189bdfc/6b313c6f9f0c4b77bcddb9c2a15265fe/FLAGa9815d6cf [2020-09-24 16:10:44,607 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d4189bdfc/6b313c6f9f0c4b77bcddb9c2a15265fe [2020-09-24 16:10:44,624 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-24 16:10:44,631 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-24 16:10:44,633 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-24 16:10:44,633 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-24 16:10:44,638 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-24 16:10:44,639 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 04:10:44" (1/1) ... [2020-09-24 16:10:44,646 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3dbfc66d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 04:10:44, skipping insertion in model container [2020-09-24 16:10:44,646 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 04:10:44" (1/1) ... [2020-09-24 16:10:44,656 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-24 16:10:44,684 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-24 16:10:44,921 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-24 16:10:44,926 INFO L203 MainTranslator]: Completed pre-run [2020-09-24 16:10:44,944 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-24 16:10:44,963 INFO L208 MainTranslator]: Completed translation [2020-09-24 16:10:44,963 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 04:10:44 WrapperNode [2020-09-24 16:10:44,964 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-24 16:10:44,965 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-24 16:10:44,965 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-24 16:10:44,965 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-24 16:10:44,983 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 04:10:44" (1/1) ... [2020-09-24 16:10:44,983 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 04:10:44" (1/1) ... [2020-09-24 16:10:44,989 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 04:10:44" (1/1) ... [2020-09-24 16:10:44,990 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 04:10:44" (1/1) ... [2020-09-24 16:10:44,994 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 04:10:44" (1/1) ... [2020-09-24 16:10:45,000 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 04:10:44" (1/1) ... [2020-09-24 16:10:45,002 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 04:10:44" (1/1) ... [2020-09-24 16:10:45,081 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-24 16:10:45,082 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-24 16:10:45,082 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-24 16:10:45,082 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-24 16:10:45,084 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 04:10:44" (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 [2020-09-24 16:10:45,172 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-24 16:10:45,172 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-24 16:10:45,172 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-24 16:10:45,172 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-24 16:10:45,173 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-24 16:10:45,173 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-24 16:10:45,173 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-24 16:10:45,173 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-24 16:10:45,173 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-24 16:10:45,395 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-24 16:10:45,395 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-09-24 16:10:45,406 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 04:10:45 BoogieIcfgContainer [2020-09-24 16:10:45,407 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-24 16:10:45,411 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-24 16:10:45,411 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-24 16:10:45,424 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-24 16:10:45,427 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.09 04:10:44" (1/3) ... [2020-09-24 16:10:45,429 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c96bd29 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 04:10:45, skipping insertion in model container [2020-09-24 16:10:45,429 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 04:10:44" (2/3) ... [2020-09-24 16:10:45,435 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c96bd29 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 04:10:45, skipping insertion in model container [2020-09-24 16:10:45,435 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 04:10:45" (3/3) ... [2020-09-24 16:10:45,438 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c [2020-09-24 16:10:45,456 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-24 16:10:45,494 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-24 16:10:45,522 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-24 16:10:45,559 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-24 16:10:45,560 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-24 16:10:45,560 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-24 16:10:45,560 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-24 16:10:45,560 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-24 16:10:45,560 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-24 16:10:45,560 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-24 16:10:45,561 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-24 16:10:45,580 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-09-24 16:10:45,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-09-24 16:10:45,587 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 16:10:45,589 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 16:10:45,589 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 16:10:45,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 16:10:45,598 INFO L82 PathProgramCache]: Analyzing trace with hash 493765703, now seen corresponding path program 1 times [2020-09-24 16:10:45,607 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 16:10:45,607 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1730978687] [2020-09-24 16:10:45,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 16:10:45,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 16:10:45,718 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 16:10:45,718 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 16:10:45,718 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 16:10:45,718 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 16:10:45,719 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 20 [2020-09-24 16:10:45,719 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 16:10:45,719 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 13 [2020-09-24 16:10:45,719 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 16:10:45,719 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-24 16:10:45,719 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 13 [2020-09-24 16:10:45,720 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-24 16:10:45,720 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 16:10:45,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 16:10:45,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 16:10:45,749 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 16:10:45,750 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 16:10:45,750 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 16:10:45,750 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 16:10:45,751 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-24 16:10:45,751 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 16:10:45,751 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-09-24 16:10:45,751 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 16:10:45,752 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-24 16:10:45,752 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 16:10:45,752 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-24 16:10:45,752 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 16:10:45,759 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 16:10:45,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1730978687] [2020-09-24 16:10:45,763 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-24 16:10:45,763 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-09-24 16:10:45,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567507856] [2020-09-24 16:10:45,770 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-09-24 16:10:45,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 16:10:45,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-09-24 16:10:45,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-09-24 16:10:45,793 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-09-24 16:10:45,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 16:10:45,823 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2020-09-24 16:10:45,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-09-24 16:10:45,825 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2020-09-24 16:10:45,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 16:10:45,837 INFO L225 Difference]: With dead ends: 33 [2020-09-24 16:10:45,837 INFO L226 Difference]: Without dead ends: 16 [2020-09-24 16:10:45,842 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-09-24 16:10:45,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-09-24 16:10:45,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-09-24 16:10:45,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-09-24 16:10:45,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-09-24 16:10:45,893 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 11 [2020-09-24 16:10:45,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 16:10:45,894 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-09-24 16:10:45,894 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-09-24 16:10:45,894 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-09-24 16:10:45,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-09-24 16:10:45,895 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 16:10:45,895 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 16:10:45,896 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-24 16:10:45,896 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 16:10:45,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 16:10:45,896 INFO L82 PathProgramCache]: Analyzing trace with hash 486377535, now seen corresponding path program 1 times [2020-09-24 16:10:45,897 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 16:10:45,897 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1095939097] [2020-09-24 16:10:45,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 16:10:45,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 16:10:45,941 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 16:10:45,941 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 16:10:45,942 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 16:10:45,942 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 16:10:45,942 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 20 [2020-09-24 16:10:45,943 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 16:10:45,943 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 13 [2020-09-24 16:10:45,943 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 16:10:45,943 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-24 16:10:45,944 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-24 16:10:45,944 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 3 [2020-09-24 16:10:45,944 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-24 16:10:46,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 16:10:46,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 16:10:46,035 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 16:10:46,036 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 16:10:46,036 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 16:10:46,036 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 16:10:46,037 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-24 16:10:46,037 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 16:10:46,037 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-09-24 16:10:46,038 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 16:10:46,038 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-24 16:10:46,038 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 16:10:46,039 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-24 16:10:46,039 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-24 16:10:46,042 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 16:10:46,043 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1095939097] [2020-09-24 16:10:46,043 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-24 16:10:46,044 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-24 16:10:46,044 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471024719] [2020-09-24 16:10:46,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-24 16:10:46,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 16:10:46,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-24 16:10:46,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-24 16:10:46,047 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 3 states. [2020-09-24 16:10:46,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 16:10:46,076 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-09-24 16:10:46,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-24 16:10:46,077 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2020-09-24 16:10:46,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 16:10:46,079 INFO L225 Difference]: With dead ends: 24 [2020-09-24 16:10:46,079 INFO L226 Difference]: Without dead ends: 19 [2020-09-24 16:10:46,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-24 16:10:46,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-09-24 16:10:46,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2020-09-24 16:10:46,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-09-24 16:10:46,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-09-24 16:10:46,087 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 11 [2020-09-24 16:10:46,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 16:10:46,087 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-09-24 16:10:46,087 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-24 16:10:46,088 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-09-24 16:10:46,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-24 16:10:46,089 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 16:10:46,089 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 16:10:46,089 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-24 16:10:46,090 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 16:10:46,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 16:10:46,091 INFO L82 PathProgramCache]: Analyzing trace with hash -1748013841, now seen corresponding path program 1 times [2020-09-24 16:10:46,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 16:10:46,091 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1879613081] [2020-09-24 16:10:46,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 16:10:46,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 16:10:46,158 FATAL L256 erpolLogProxyWrapper]: Difference in size: 3 [2020-09-24 16:10:46,162 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 16:10:46,162 FATAL L256 erpolLogProxyWrapper]: Difference in width: 5 [2020-09-24 16:10:46,162 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 16:10:46,163 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 25 [2020-09-24 16:10:46,163 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 16:10:46,163 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 44 [2020-09-24 16:10:46,163 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 16:10:46,164 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-09-24 16:10:46,164 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-24 16:10:46,164 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 8 [2020-09-24 16:10:46,164 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 16:10:46,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 16:10:46,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 16:10:46,273 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 16:10:46,274 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 16:10:46,274 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 16:10:46,274 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 16:10:46,275 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-24 16:10:46,275 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 16:10:46,275 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-09-24 16:10:46,276 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 16:10:46,276 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-24 16:10:46,276 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 16:10:46,277 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-24 16:10:46,277 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-24 16:10:46,283 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 16:10:46,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1879613081] [2020-09-24 16:10:46,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 16:10:46,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-09-24 16:10:46,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347363481] [2020-09-24 16:10:46,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-24 16:10:46,285 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 16:10:46,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-24 16:10:46,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-09-24 16:10:46,286 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 5 states. [2020-09-24 16:10:46,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 16:10:46,362 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-09-24 16:10:46,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-24 16:10:46,363 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-09-24 16:10:46,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 16:10:46,364 INFO L225 Difference]: With dead ends: 29 [2020-09-24 16:10:46,364 INFO L226 Difference]: Without dead ends: 24 [2020-09-24 16:10:46,365 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-09-24 16:10:46,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-09-24 16:10:46,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2020-09-24 16:10:46,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-09-24 16:10:46,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-09-24 16:10:46,371 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 16 [2020-09-24 16:10:46,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 16:10:46,372 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-09-24 16:10:46,372 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-24 16:10:46,372 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-09-24 16:10:46,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-09-24 16:10:46,373 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 16:10:46,373 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 16:10:46,374 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-24 16:10:46,374 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 16:10:46,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 16:10:46,374 INFO L82 PathProgramCache]: Analyzing trace with hash 1960900159, now seen corresponding path program 2 times [2020-09-24 16:10:46,375 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 16:10:46,376 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1623348663] [2020-09-24 16:10:46,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 16:10:46,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 16:10:46,498 FATAL L256 erpolLogProxyWrapper]: Difference in size: 1 [2020-09-24 16:10:46,499 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 16:10:46,499 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 16:10:46,499 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 16:10:46,499 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 30 [2020-09-24 16:10:46,499 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 16:10:46,500 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 82 [2020-09-24 16:10:46,500 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 16:10:46,500 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-09-24 16:10:46,500 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-24 16:10:46,500 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 18 [2020-09-24 16:10:46,501 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 16:10:46,647 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 16:10:46,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 16:10:46,650 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 16:10:46,650 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 16:10:46,651 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 16:10:46,651 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 16:10:46,651 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-24 16:10:46,651 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 16:10:46,652 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-24 16:10:46,652 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 16:10:46,652 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-24 16:10:46,652 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 16:10:46,653 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-24 16:10:46,653 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-24 16:10:46,658 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 16:10:46,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1623348663] [2020-09-24 16:10:46,659 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 16:10:46,659 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-24 16:10:46,659 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462295300] [2020-09-24 16:10:46,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-24 16:10:46,660 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 16:10:46,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-24 16:10:46,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-09-24 16:10:46,661 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 9 states. [2020-09-24 16:10:46,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 16:10:46,837 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-09-24 16:10:46,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-24 16:10:46,839 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 21 [2020-09-24 16:10:46,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 16:10:46,840 INFO L225 Difference]: With dead ends: 34 [2020-09-24 16:10:46,841 INFO L226 Difference]: Without dead ends: 29 [2020-09-24 16:10:46,842 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2020-09-24 16:10:46,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-09-24 16:10:46,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2020-09-24 16:10:46,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-09-24 16:10:46,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-09-24 16:10:46,854 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 21 [2020-09-24 16:10:46,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 16:10:46,855 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-09-24 16:10:46,855 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-24 16:10:46,855 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-09-24 16:10:46,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-09-24 16:10:46,857 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 16:10:46,857 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 16:10:46,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-24 16:10:46,858 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 16:10:46,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 16:10:46,858 INFO L82 PathProgramCache]: Analyzing trace with hash 1793113839, now seen corresponding path program 3 times [2020-09-24 16:10:46,859 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 16:10:46,859 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1426050497] [2020-09-24 16:10:46,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 16:10:46,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 16:10:46,953 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 16:10:46,953 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 16:10:46,954 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 16:10:46,954 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 16:10:46,954 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 35 [2020-09-24 16:10:46,954 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 16:10:46,955 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 61 [2020-09-24 16:10:46,955 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 16:10:46,955 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-09-24 16:10:46,955 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-24 16:10:46,956 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 18 [2020-09-24 16:10:46,956 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 16:10:47,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 16:10:47,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 16:10:47,155 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 16:10:47,156 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 16:10:47,156 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 16:10:47,156 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 16:10:47,156 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-24 16:10:47,156 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 16:10:47,157 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4 [2020-09-24 16:10:47,157 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 16:10:47,158 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-24 16:10:47,158 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 16:10:47,158 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-24 16:10:47,158 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 16:10:47,163 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 16:10:47,164 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1426050497] [2020-09-24 16:10:47,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 16:10:47,164 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-24 16:10:47,164 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1641970628] [2020-09-24 16:10:47,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-24 16:10:47,165 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 16:10:47,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-24 16:10:47,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2020-09-24 16:10:47,166 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 9 states. [2020-09-24 16:10:47,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 16:10:47,342 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-09-24 16:10:47,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-24 16:10:47,344 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-09-24 16:10:47,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 16:10:47,345 INFO L225 Difference]: With dead ends: 39 [2020-09-24 16:10:47,346 INFO L226 Difference]: Without dead ends: 34 [2020-09-24 16:10:47,346 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2020-09-24 16:10:47,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-09-24 16:10:47,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-09-24 16:10:47,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-09-24 16:10:47,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-09-24 16:10:47,357 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 26 [2020-09-24 16:10:47,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 16:10:47,358 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-09-24 16:10:47,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-24 16:10:47,359 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-09-24 16:10:47,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-09-24 16:10:47,361 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 16:10:47,361 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 16:10:47,362 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-24 16:10:47,362 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 16:10:47,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 16:10:47,363 INFO L82 PathProgramCache]: Analyzing trace with hash -774708161, now seen corresponding path program 4 times [2020-09-24 16:10:47,363 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 16:10:47,363 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [583068288] [2020-09-24 16:10:47,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 16:10:47,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 16:10:47,464 FATAL L256 erpolLogProxyWrapper]: Difference in size: 3 [2020-09-24 16:10:47,464 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 16:10:47,465 FATAL L256 erpolLogProxyWrapper]: Difference in width: 5 [2020-09-24 16:10:47,465 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 16:10:47,465 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 40 [2020-09-24 16:10:47,465 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 16:10:47,465 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 76 [2020-09-24 16:10:47,466 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 16:10:47,466 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 10 [2020-09-24 16:10:47,466 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-24 16:10:47,466 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 23 [2020-09-24 16:10:47,466 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 16:10:47,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 16:10:47,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 16:10:47,712 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 16:10:47,713 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 16:10:47,713 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 16:10:47,713 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 16:10:47,713 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-24 16:10:47,714 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 16:10:47,714 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-24 16:10:47,715 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 16:10:47,715 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-24 16:10:47,715 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 16:10:47,715 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-24 16:10:47,715 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 16:10:47,723 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 16:10:47,723 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [583068288] [2020-09-24 16:10:47,724 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 16:10:47,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-09-24 16:10:47,726 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446427523] [2020-09-24 16:10:47,727 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-24 16:10:47,727 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 16:10:47,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-24 16:10:47,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2020-09-24 16:10:47,730 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 11 states. [2020-09-24 16:10:48,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 16:10:48,020 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-09-24 16:10:48,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-24 16:10:48,022 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 31 [2020-09-24 16:10:48,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 16:10:48,023 INFO L225 Difference]: With dead ends: 44 [2020-09-24 16:10:48,023 INFO L226 Difference]: Without dead ends: 39 [2020-09-24 16:10:48,026 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342 [2020-09-24 16:10:48,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-09-24 16:10:48,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2020-09-24 16:10:48,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-09-24 16:10:48,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-09-24 16:10:48,038 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 31 [2020-09-24 16:10:48,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 16:10:48,039 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-09-24 16:10:48,039 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-24 16:10:48,040 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-09-24 16:10:48,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-09-24 16:10:48,041 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 16:10:48,042 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 16:10:48,043 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-24 16:10:48,043 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 16:10:48,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 16:10:48,044 INFO L82 PathProgramCache]: Analyzing trace with hash -1644982033, now seen corresponding path program 5 times [2020-09-24 16:10:48,044 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 16:10:48,045 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [650588461] [2020-09-24 16:10:48,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 16:10:48,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 16:10:48,157 FATAL L256 erpolLogProxyWrapper]: Difference in size: 3 [2020-09-24 16:10:48,157 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 16:10:48,158 FATAL L256 erpolLogProxyWrapper]: Difference in width: 5 [2020-09-24 16:10:48,158 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 16:10:48,158 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 45 [2020-09-24 16:10:48,158 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 16:10:48,159 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 75 [2020-09-24 16:10:48,159 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 16:10:48,160 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 12 [2020-09-24 16:10:48,160 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-24 16:10:48,160 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 28 [2020-09-24 16:10:48,160 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-24 16:10:48,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 16:10:48,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 16:10:48,393 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 16:10:48,393 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 16:10:48,393 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 16:10:48,393 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 16:10:48,393 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-24 16:10:48,394 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 16:10:48,394 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-24 16:10:48,395 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 16:10:48,395 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-24 16:10:48,395 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 16:10:48,395 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-24 16:10:48,396 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 16:10:48,401 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 16:10:48,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [650588461] [2020-09-24 16:10:48,402 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 16:10:48,402 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-24 16:10:48,402 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605296692] [2020-09-24 16:10:48,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-24 16:10:48,404 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 16:10:48,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-24 16:10:48,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-09-24 16:10:48,406 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 13 states. [2020-09-24 16:10:48,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 16:10:48,737 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-09-24 16:10:48,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-09-24 16:10:48,738 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-09-24 16:10:48,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 16:10:48,739 INFO L225 Difference]: With dead ends: 49 [2020-09-24 16:10:48,739 INFO L226 Difference]: Without dead ends: 44 [2020-09-24 16:10:48,740 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2020-09-24 16:10:48,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-09-24 16:10:48,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-09-24 16:10:48,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-09-24 16:10:48,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-09-24 16:10:48,748 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 36 [2020-09-24 16:10:48,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 16:10:48,748 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-09-24 16:10:48,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-24 16:10:48,748 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-09-24 16:10:48,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-09-24 16:10:48,749 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 16:10:48,750 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 16:10:48,750 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-24 16:10:48,750 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 16:10:48,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 16:10:48,751 INFO L82 PathProgramCache]: Analyzing trace with hash 330519103, now seen corresponding path program 6 times [2020-09-24 16:10:48,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 16:10:48,751 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2007390758] [2020-09-24 16:10:48,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 16:10:48,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-24 16:10:48,766 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-24 16:10:48,766 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-24 16:10:48,771 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-24 16:10:48,791 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.09 04:10:48 BoogieIcfgContainer [2020-09-24 16:10:48,791 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-24 16:10:48,794 INFO L168 Benchmark]: Toolchain (without parser) took 4166.74 ms. Allocated memory was 138.9 MB in the beginning and 248.0 MB in the end (delta: 109.1 MB). Free memory was 102.1 MB in the beginning and 158.4 MB in the end (delta: -56.2 MB). Peak memory consumption was 52.8 MB. Max. memory is 7.1 GB. [2020-09-24 16:10:48,795 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 138.9 MB. Free memory was 120.5 MB in the beginning and 120.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-09-24 16:10:48,796 INFO L168 Benchmark]: CACSL2BoogieTranslator took 331.24 ms. Allocated memory is still 138.9 MB. Free memory was 101.5 MB in the beginning and 92.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-09-24 16:10:48,797 INFO L168 Benchmark]: Boogie Preprocessor took 116.99 ms. Allocated memory was 138.9 MB in the beginning and 201.3 MB in the end (delta: 62.4 MB). Free memory was 92.3 MB in the beginning and 181.3 MB in the end (delta: -89.0 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. [2020-09-24 16:10:48,798 INFO L168 Benchmark]: RCFGBuilder took 324.89 ms. Allocated memory is still 201.3 MB. Free memory was 180.4 MB in the beginning and 169.4 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. [2020-09-24 16:10:48,799 INFO L168 Benchmark]: TraceAbstraction took 3379.88 ms. Allocated memory was 201.3 MB in the beginning and 248.0 MB in the end (delta: 46.7 MB). Free memory was 168.8 MB in the beginning and 158.4 MB in the end (delta: 10.4 MB). Peak memory consumption was 57.1 MB. Max. memory is 7.1 GB. [2020-09-24 16:10:48,803 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 138.9 MB. Free memory was 120.5 MB in the beginning and 120.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 331.24 ms. Allocated memory is still 138.9 MB. Free memory was 101.5 MB in the beginning and 92.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 116.99 ms. Allocated memory was 138.9 MB in the beginning and 201.3 MB in the end (delta: 62.4 MB). Free memory was 92.3 MB in the beginning and 181.3 MB in the end (delta: -89.0 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 324.89 ms. Allocated memory is still 201.3 MB. Free memory was 180.4 MB in the beginning and 169.4 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3379.88 ms. Allocated memory was 201.3 MB in the beginning and 248.0 MB in the end (delta: 46.7 MB). Free memory was 168.8 MB in the beginning and 158.4 MB in the end (delta: 10.4 MB). Peak memory consumption was 57.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L11] unsigned int x = 0; [L12] unsigned int y = 1; [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND FALSE !(x < 6) [L19] CALL __VERIFIER_assert(x != 6) [L4] COND TRUE !(cond) [L5] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 22 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.2s, OverallIterations: 8, TraceHistogramMax: 6, AutomataDifference: 1.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 117 SDtfs, 54 SDslu, 441 SDs, 0 SdLazy, 424 SolverSat, 31 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 96 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 1.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=42occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 12 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.4s InterpolantComputationTime, 193 NumberOfCodeBlocks, 193 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 145 ConstructedInterpolants, 0 QuantifiedInterpolants, 19165 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 7 InterpolantComputations, 2 PerfectInterpolantSequences, 0/115 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...