/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=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SHALLOWEST --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-industry-pattern/aiob_4.c.v+lh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 19:53:45,766 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 19:53:45,768 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 19:53:45,792 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 19:53:45,793 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 19:53:45,794 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 19:53:45,795 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 19:53:45,797 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 19:53:45,798 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 19:53:45,799 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 19:53:45,800 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 19:53:45,801 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 19:53:45,801 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 19:53:45,802 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 19:53:45,803 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 19:53:45,805 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 19:53:45,805 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 19:53:45,806 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 19:53:45,808 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 19:53:45,810 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 19:53:45,811 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 19:53:45,812 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 19:53:45,813 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 19:53:45,814 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 19:53:45,816 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 19:53:45,816 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 19:53:45,817 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 19:53:45,817 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 19:53:45,818 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 19:53:45,819 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-21 19:53:45,823 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 19:53:45,824 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 19:53:45,825 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 19:53:45,829 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 [2020-08-21 19:53:45,859 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 19:53:45,859 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 19:53:45,860 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 19:53:45,861 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 19:53:45,861 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 19:53:45,861 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 19:53:45,861 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 19:53:45,861 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 19:53:45,862 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 19:53:45,862 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 19:53:45,862 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 19:53:45,862 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 19:53:45,862 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 19:53:45,863 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 19:53:45,863 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 19:53:45,863 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 19:53:45,863 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 19:53:45,863 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 19:53:45,864 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 19:53:45,864 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 19:53:45,864 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 19:53:45,864 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 19:53:45,864 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 19:53:45,864 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 19:53:45,865 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 19:53:45,865 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 19:53:45,865 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 19:53:45,865 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 19:53:45,865 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 19:53:45,866 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=5000;interpolation-heuristic=SHALLOWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SHALLOWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SHALLOWEST;log-additional-information=true; [2020-08-21 19:53:46,205 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 19:53:46,226 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 19:53:46,231 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 19:53:46,237 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 19:53:46,238 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 19:53:46,239 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+lh-reducer.c [2020-08-21 19:53:46,306 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/dda3206a3/c1e5e3a2f9074a04985906dfdf0fef24/FLAGcf7ce30e0 [2020-08-21 19:53:46,723 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 19:53:46,724 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+lh-reducer.c [2020-08-21 19:53:46,736 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/dda3206a3/c1e5e3a2f9074a04985906dfdf0fef24/FLAGcf7ce30e0 [2020-08-21 19:53:47,060 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/dda3206a3/c1e5e3a2f9074a04985906dfdf0fef24 [2020-08-21 19:53:47,070 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 19:53:47,072 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 19:53:47,073 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 19:53:47,073 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 19:53:47,077 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 19:53:47,078 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:53:47" (1/1) ... [2020-08-21 19:53:47,081 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@69889533 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:47, skipping insertion in model container [2020-08-21 19:53:47,081 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:53:47" (1/1) ... [2020-08-21 19:53:47,089 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 19:53:47,136 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 19:53:47,590 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:53:47,609 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 19:53:47,813 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:53:47,832 INFO L208 MainTranslator]: Completed translation [2020-08-21 19:53:47,832 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:47 WrapperNode [2020-08-21 19:53:47,833 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 19:53:47,834 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 19:53:47,834 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 19:53:47,834 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 19:53:47,849 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:47" (1/1) ... [2020-08-21 19:53:47,850 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:47" (1/1) ... [2020-08-21 19:53:47,867 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:47" (1/1) ... [2020-08-21 19:53:47,868 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:47" (1/1) ... [2020-08-21 19:53:47,901 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:47" (1/1) ... [2020-08-21 19:53:47,906 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:47" (1/1) ... [2020-08-21 19:53:47,910 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:47" (1/1) ... [2020-08-21 19:53:47,922 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 19:53:47,923 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 19:53:47,923 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 19:53:47,923 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 19:53:47,924 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:47" (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 [2020-08-21 19:53:47,987 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 19:53:47,988 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 19:53:47,989 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 19:53:47,989 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 19:53:47,990 INFO L130 BoogieDeclarations]: Found specification of procedure Id_MCDC_89 [2020-08-21 19:53:47,990 INFO L130 BoogieDeclarations]: Found specification of procedure fopen [2020-08-21 19:53:47,990 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 19:53:47,990 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 19:53:47,991 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 19:53:47,992 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 19:53:47,992 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 19:53:47,992 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-08-21 19:53:47,993 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 19:53:47,993 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 19:53:47,993 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 19:53:47,994 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 19:53:47,994 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 19:53:50,869 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 19:53:50,870 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 19:53:50,875 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:53:50 BoogieIcfgContainer [2020-08-21 19:53:50,875 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 19:53:50,879 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 19:53:50,879 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 19:53:50,883 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 19:53:50,883 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 07:53:47" (1/3) ... [2020-08-21 19:53:50,884 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3dd6d38a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:53:50, skipping insertion in model container [2020-08-21 19:53:50,885 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:53:47" (2/3) ... [2020-08-21 19:53:50,886 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3dd6d38a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:53:50, skipping insertion in model container [2020-08-21 19:53:50,886 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:53:50" (3/3) ... [2020-08-21 19:53:50,890 INFO L109 eAbstractionObserver]: Analyzing ICFG aiob_4.c.v+lh-reducer.c [2020-08-21 19:53:50,901 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 19:53:50,910 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 19:53:50,925 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 19:53:50,952 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 19:53:50,952 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 19:53:50,953 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 19:53:50,953 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 19:53:50,954 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 19:53:50,954 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 19:53:50,954 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 19:53:50,954 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 19:53:50,980 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-21 19:53:50,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 19:53:50,988 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:50,989 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:50,990 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:50,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:50,997 INFO L82 PathProgramCache]: Analyzing trace with hash 1960518123, now seen corresponding path program 1 times [2020-08-21 19:53:51,007 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:51,008 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1519381709] [2020-08-21 19:53:51,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:51,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:51,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:51,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:51,552 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:51,553 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1519381709] [2020-08-21 19:53:51,555 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:53:51,556 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 19:53:51,557 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063898089] [2020-08-21 19:53:51,562 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:53:51,563 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:51,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:53:51,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:53:51,580 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 5 states. [2020-08-21 19:53:53,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:53,815 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-08-21 19:53:53,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 19:53:53,818 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 19:53:53,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:53,833 INFO L225 Difference]: With dead ends: 38 [2020-08-21 19:53:53,833 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 19:53:53,840 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:53:53,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 19:53:53,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-21 19:53:53,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 19:53:53,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-21 19:53:53,881 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 12 [2020-08-21 19:53:53,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:53,881 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-21 19:53:53,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:53:53,882 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-21 19:53:53,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 19:53:53,882 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:53,883 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:53,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 19:53:53,883 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:53,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:53,884 INFO L82 PathProgramCache]: Analyzing trace with hash 1182240945, now seen corresponding path program 1 times [2020-08-21 19:53:53,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:53,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1515633312] [2020-08-21 19:53:53,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:53,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:54,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:54,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:54,103 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:54,104 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1515633312] [2020-08-21 19:53:54,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:54,104 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 19:53:54,105 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489497727] [2020-08-21 19:53:54,106 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 19:53:54,107 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:54,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 19:53:54,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:53:54,108 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states. [2020-08-21 19:53:58,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:53:58,333 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 19:53:58,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 19:53:58,337 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2020-08-21 19:53:58,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:53:58,338 INFO L225 Difference]: With dead ends: 29 [2020-08-21 19:53:58,338 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 19:53:58,339 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 19:53:58,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 19:53:58,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 23. [2020-08-21 19:53:58,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 19:53:58,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 19:53:58,352 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 17 [2020-08-21 19:53:58,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:53:58,353 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 19:53:58,353 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 19:53:58,353 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 19:53:58,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 19:53:58,354 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:53:58,354 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:53:58,354 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 19:53:58,355 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:53:58,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:53:58,356 INFO L82 PathProgramCache]: Analyzing trace with hash 491744683, now seen corresponding path program 2 times [2020-08-21 19:53:58,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:53:58,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [231407659] [2020-08-21 19:53:58,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:53:58,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:58,589 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:53:58,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:53:58,599 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:53:58,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [231407659] [2020-08-21 19:53:58,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:53:58,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 19:53:58,601 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214163050] [2020-08-21 19:53:58,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 19:53:58,601 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:53:58,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 19:53:58,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:53:58,602 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 7 states. [2020-08-21 19:54:04,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:54:04,875 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-21 19:54:04,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 19:54:04,876 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-21 19:54:04,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:54:04,878 INFO L225 Difference]: With dead ends: 34 [2020-08-21 19:54:04,878 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 19:54:04,880 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 19:54:04,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 19:54:04,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-21 19:54:04,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 19:54:04,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-21 19:54:04,892 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 22 [2020-08-21 19:54:04,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:54:04,894 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-21 19:54:04,894 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 19:54:04,894 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-21 19:54:04,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 19:54:04,897 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:54:04,897 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:54:04,897 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 19:54:04,897 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:54:04,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:54:04,898 INFO L82 PathProgramCache]: Analyzing trace with hash 161258737, now seen corresponding path program 3 times [2020-08-21 19:54:04,898 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:54:04,898 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1833972465] [2020-08-21 19:54:04,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:54:04,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:54:05,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:54:05,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:54:05,143 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:54:05,143 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1833972465] [2020-08-21 19:54:05,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:54:05,144 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 19:54:05,144 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448630648] [2020-08-21 19:54:05,145 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 19:54:05,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:54:05,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 19:54:05,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-21 19:54:05,146 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 8 states. [2020-08-21 19:54:13,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:54:13,441 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-21 19:54:13,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 19:54:13,442 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-08-21 19:54:13,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:54:13,444 INFO L225 Difference]: With dead ends: 39 [2020-08-21 19:54:13,444 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 19:54:13,445 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 19:54:13,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 19:54:13,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33. [2020-08-21 19:54:13,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 19:54:13,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-21 19:54:13,451 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 27 [2020-08-21 19:54:13,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:54:13,451 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-21 19:54:13,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 19:54:13,452 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-21 19:54:13,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 19:54:13,453 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:54:13,453 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:54:13,453 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 19:54:13,453 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:54:13,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:54:13,454 INFO L82 PathProgramCache]: Analyzing trace with hash 1890060651, now seen corresponding path program 4 times [2020-08-21 19:54:13,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:54:13,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [714762783] [2020-08-21 19:54:13,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:54:13,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:54:13,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:54:13,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:54:13,667 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:54:13,667 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [714762783] [2020-08-21 19:54:13,667 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:54:13,668 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 19:54:13,668 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801547553] [2020-08-21 19:54:13,668 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 19:54:13,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:54:13,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 19:54:13,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 19:54:13,669 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 9 states. [2020-08-21 19:54:24,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:54:24,015 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 19:54:24,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 19:54:24,019 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 32 [2020-08-21 19:54:24,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:54:24,020 INFO L225 Difference]: With dead ends: 44 [2020-08-21 19:54:24,020 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 19:54:24,021 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 19:54:24,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 19:54:24,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-21 19:54:24,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 19:54:24,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 19:54:24,035 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 32 [2020-08-21 19:54:24,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:54:24,036 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 19:54:24,036 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 19:54:24,037 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 19:54:24,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 19:54:24,039 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:54:24,039 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:54:24,040 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 19:54:24,040 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:54:24,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:54:24,041 INFO L82 PathProgramCache]: Analyzing trace with hash -737191631, now seen corresponding path program 5 times [2020-08-21 19:54:24,041 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:54:24,042 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [940503369] [2020-08-21 19:54:24,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:54:24,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:54:24,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:54:24,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:54:24,311 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:54:24,311 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [940503369] [2020-08-21 19:54:24,312 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:54:24,314 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 19:54:24,316 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666080216] [2020-08-21 19:54:24,318 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 19:54:24,318 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:54:24,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 19:54:24,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-21 19:54:24,319 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 10 states. [2020-08-21 19:54:36,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:54:36,742 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-21 19:54:36,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 19:54:36,742 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 37 [2020-08-21 19:54:36,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:54:36,743 INFO L225 Difference]: With dead ends: 49 [2020-08-21 19:54:36,743 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 19:54:36,744 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 19:54:36,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 19:54:36,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2020-08-21 19:54:36,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 19:54:36,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-21 19:54:36,762 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 37 [2020-08-21 19:54:36,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:54:36,763 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-21 19:54:36,766 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 19:54:36,766 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-21 19:54:36,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 19:54:36,767 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:54:36,767 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:54:36,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 19:54:36,768 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:54:36,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:54:36,768 INFO L82 PathProgramCache]: Analyzing trace with hash -1715407573, now seen corresponding path program 6 times [2020-08-21 19:54:36,768 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:54:36,769 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [29315076] [2020-08-21 19:54:36,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:54:36,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:54:37,063 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:54:37,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:54:37,074 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:54:37,075 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [29315076] [2020-08-21 19:54:37,075 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:54:37,075 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 19:54:37,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317797] [2020-08-21 19:54:37,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 19:54:37,076 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:54:37,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 19:54:37,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-21 19:54:37,077 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 11 states. [2020-08-21 19:54:51,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:54:51,619 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-21 19:54:51,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 19:54:51,619 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 42 [2020-08-21 19:54:51,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:54:51,621 INFO L225 Difference]: With dead ends: 54 [2020-08-21 19:54:51,621 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 19:54:51,621 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 19:54:51,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 19:54:51,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-21 19:54:51,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 19:54:51,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-21 19:54:51,629 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 42 [2020-08-21 19:54:51,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:54:51,630 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-21 19:54:51,630 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 19:54:51,630 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-21 19:54:51,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 19:54:51,631 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:54:51,631 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:54:51,632 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 19:54:51,632 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:54:51,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:54:51,632 INFO L82 PathProgramCache]: Analyzing trace with hash -462174863, now seen corresponding path program 7 times [2020-08-21 19:54:51,632 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:54:51,633 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1477866352] [2020-08-21 19:54:51,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:54:51,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:54:51,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:54:51,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:54:51,876 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:54:51,876 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1477866352] [2020-08-21 19:54:51,876 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:54:51,877 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 19:54:51,877 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296723163] [2020-08-21 19:54:51,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 19:54:51,878 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:54:51,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 19:54:51,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-08-21 19:54:51,879 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 12 states.